Merge pull request #480 from jktjkt/python-3.12

CI: Python 3.12 and extended platform coverage
Add test on _check_one_request function
2025-10-30 17:47:50 +00:00 · 2023-11-23 17:54:02 +01:00 · 2023-11-17 16:26:12 +01:00 · 2023-11-17 16:26:12 +01:00 · 2023-11-17 16:26:12 +01:00 · 2023-11-17 16:23:48 +01:00
83 changed files with 7294 additions and 2210 deletions
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,14 +11,14 @@ jobs:
    name: Tox test
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - uses: fedora-python/tox-github-action@v0.4
        with:
          tox_env: ${{ matrix.tox_env }}
          dnf_install: ${{ matrix.dnf_install }}
-      - uses: codecov/codecov-action@29386c70ef20e286228c72b668a06fd0e8399192
+      - uses: codecov/codecov-action@v3.1.1
        if: ${{ endswith(matrix.tox_env, '-cover') }}
        with:
          files: ${{ github.workspace }}/cover/coverage.xml
@@ -28,7 +28,9 @@ jobs:
        tox_env:
          - py38
          - py39
-          - py310-cover
+          - py310
+          - py311
+          - py312-cover
        include:
          - tox_env: docs
            dnf_install: graphviz
@@ -39,13 +41,13 @@ jobs:
    name: PyPI packaging
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
        name: Install Python
        with:
-          python-version: '3.10'
+          python-version: '3.12'
      - uses: casperdcl/deploy-pypi@bb869aafd89f657ceaafe9561d3b5584766c0f95
        with:
          password: ${{ secrets.PYPI_API_TOKEN }}
@@ -63,7 +65,7 @@ jobs:
        with:
          username: jktjkt
          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: Extract tag name
@@ -97,10 +99,10 @@ jobs:
    name: Tests on other platforms
    runs-on: ${{ matrix.os }}
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python_version }}
      - run: |
@@ -113,5 +115,33 @@ jobs:
        include:
          - os: windows-2019
            python_version: "3.10"
+          - os: windows-2022
+            python_version: "3.11"
+          - os: windows-2022
+            python_version: "3.12"
          - os: macos-12
-            python_version: "3.10"
+            python_version: "3.11"
+          - os: macos-13
+            python_version: "3.12"
+
+  paywalled-platforms:
+    name: Tests on paywalled platforms
+    if: github.repository_owner == 'Telecominfraproject'
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python_version }}
+      - run: |
+          pip install -r tests/requirements.txt
+          pip install --editable .
+          pytest -vv
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-13-xlarge # Apple M1 CPU
+            python_version: "3.12"
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -2,10 +2,18 @@
 - project:
    check:
      jobs:
-        - tox-py38
-        - tox-py39
-        - tox-py310-cover
-        - tox-docs-f35
+        - tox-py38:
+            vars:
+              ensure_tox_version: '<4'
+        - tox-py39:
+            vars:
+              ensure_tox_version: '<4'
+        - tox-py310-cover:
+            vars:
+              ensure_tox_version: '<4'
+        - tox-docs-f36:
+            vars:
+              ensure_tox_version: '<4'
        - coverage-diff:
            voting: false
            dependencies:
@@ -16,7 +24,11 @@
              coverage_job_name_current: tox-py310-cover
        - tox-linters-diff-n-report:
            voting: false
-        - tox-py310-cover-previous
+            vars:
+              ensure_tox_version: '<4'
+        - tox-py310-cover-previous:
+            vars:
+              ensure_tox_version: '<4'
    tag:
      jobs:
        - oopt-release-python:
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -11,18 +11,21 @@ To learn how to contribute, please see CONTRIBUTING.md
 - Brian Taylor (Facebook) <briantaylor@fb.com>
 - David Boertjes (Ciena) <dboertje@ciena.com>
 - Diego Landa (Facebook) <dlanda@fb.com>
+- Emmanuelle Delfour (Orange) <WEDE7391@orange.com>
 - Esther Le Rouzic (Orange) <esther.lerouzic@orange.com>
 - Gabriele Galimberti (Cisco) <ggalimbe@cisco.com>
 - Gert Grammel (Juniper Networks) <ggrammel@juniper.net>
+- Giacomo Borraccini (Politecnico di Torino) <giacomo.borraccini@polito.it>
 - Gilad Goldfarb (Facebook) <giladg@fb.com>
 - James Powell (Telecom Infra Project) <james.powell@telecominfraproject.com>
- Jan Kundrát (Telecom Infra Project) <jan.kundrat@telecominfraproject.com>
+- Jan Kundrát (Telecom Infra Project) <jkt@jankundrat.com>
 - Jeanluc Augé (Orange) <jeanluc.auge@orange.com>
 - Jonas Mårtensson (RISE) <jonas.martensson@ri.se>
 - Mattia Cantono (Politecnico di Torino) <mattia.cantono@polito.it>
 - Miguel Garrich (University Catalunya) <miquel.garrich@upct.es>
 - Raj Nagarajan (Lumentum) <raj.nagarajan@lumentum.com>
 - Roberts Miculens (Lattelecom) <roberts.miculens@lattelecom.lv>
+- Sami Alavi (NUST) <sami.mansooralavi1999@gmail.com>
 - Shengxiang Zhu (University of Arizona) <szhu@email.arizona.edu>
 - Stefan Melin (Telia Company) <Stefan.Melin@teliacompany.com>
 - Vittorio Curri (Politecnico di Torino) <vittorio.curri@polito.it>
--- a/README.md
+++ b/README.md
@@ -3,12 +3,12 @@
 [![Install via pip](https://img.shields.io/pypi/v/gnpy)](https://pypi.org/project/gnpy/)
 [![Python versions](https://img.shields.io/pypi/pyversions/gnpy)](https://pypi.org/project/gnpy/)
 [![Documentation status](https://readthedocs.org/projects/gnpy/badge/?version=master)](http://gnpy.readthedocs.io/en/master/?badge=master)
-[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/Telecominfraproject/oopt-gnpy/build)](https://github.com/Telecominfraproject/oopt-gnpy/actions/workflows/main.yml)
+[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/Telecominfraproject/oopt-gnpy/main.yml)](https://github.com/Telecominfraproject/oopt-gnpy/actions/workflows/main.yml)
 [![Gerrit](https://img.shields.io/badge/patches-via%20Gerrit-blue)](https://review.gerrithub.io/q/project:Telecominfraproject/oopt-gnpy+is:open)
 [![Contributors](https://img.shields.io/github/contributors-anon/Telecominfraproject/oopt-gnpy)](https://github.com/Telecominfraproject/oopt-gnpy/graphs/contributors)
-[![Code Quality via LGTM.com](https://img.shields.io/lgtm/grade/python/github/Telecominfraproject/oopt-gnpy)](https://lgtm.com/projects/g/Telecominfraproject/oopt-gnpy/)
 [![Code Coverage via codecov](https://img.shields.io/codecov/c/github/Telecominfraproject/oopt-gnpy)](https://codecov.io/gh/Telecominfraproject/oopt-gnpy)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3458319.svg)](https://doi.org/10.5281/zenodo.3458319)
+[![Matrix chat](https://img.shields.io/matrix/oopt-gnpy:matrix.org)](https://matrix.to/#/%23oopt-gnpy%3Amatrix.org?via=matrix.org)

 GNPy is an open-source, community-developed library for building route planning and optimization tools in real-world mesh optical networks.
 We are a consortium of operators, vendors, and academic researchers sponsored via the [Telecom Infra Project](http://telecominfraproject.com)'s [OOPT/PSE](https://telecominfraproject.com/open-optical-packet-transport) working group.
--- a/docs/about-project.md
+++ b/docs/about-project.md
@@ -12,7 +12,7 @@ We encourage all interested people outside the TIP to [join the project](https:/

 `gnpy` is looking for additional contributors, especially those with experience planning and maintaining large-scale, real-world mesh optical networks.

-To get involved, please contact [Jan Kundrát](mailto:jan.kundrat@telecominfraproject.com) or [Gert Grammel](mailto:ggrammel@juniper.net).
+To get involved, please contact [Jan Kundrát](mailto:jkt@jankundrat.com) or [Gert Grammel](mailto:ggrammel@juniper.net).

 `gnpy` contributions are currently limited to members of [TIP](http://telecominfraproject.com).
 Membership is free and open to all.
--- a/docs/biblio.bib
+++ b/docs/biblio.bib
@@ -1848,3 +1848,15 @@ month={Sept},}
  title = {Telecom Infra Project},
  url = {https://www.telecominfraproject.com},
 }
+
+@ARTICLE{DAmicoJLT2022,
+  author={D’Amico, Andrea and Correia, Bruno and London, Elliot and Virgillito,
+  Emanuele and Borraccini, Giacomo and Napoli, Antonio and Curri, Vittorio},
+  journal={Journal of Lightwave Technology},
+  title={Scalable and Disaggregated GGN Approximation Applied to a C+L+S Optical Network},
+  year={2022},
+  volume={40},
+  number={11},
+  pages={3499-3511},
+  doi={10.1109/JLT.2022.3162134}
+}
--- a/docs/intro.rst
+++ b/docs/intro.rst
@@ -10,7 +10,7 @@ fully-functional programs.

    **Note**: *If you are a network operator or involved in route planning and
    optimization for your organization, please contact project maintainer Jan
-    Kundrát <jan.kundrat@telecominfraproject.com>. gnpy is looking for users with
+    Kundrát <jkt@jankundrat.com>. gnpy is looking for users with
    specific, delineated use cases to drive requirements for future
    development.*

--- a/docs/json.rst
+++ b/docs/json.rst
@@ -44,7 +44,7 @@ For all amplifier models:
 | ``type_variety``       | (string)  | a unique name to ID the amplifier in the|
 |                        |           | JSON/Excel template topology input file |
 +------------------------+-----------+-----------------------------------------+
-| ``out_voa_auto``       | (boolean) | auto_design feature to optimize the     |
+| ``out_voa_auto``       | (boolean) | auto-design feature to optimize the     |
 |                        |           | amplifier output VOA. If true, output   |
 |                        |           | VOA is present and will be used to push |
 |                        |           | amplifier gain to its maximum, within   |
@@ -61,40 +61,69 @@ Fiber

 The fiber library currently describes SSMF and NZDF but additional fiber types can be entered by the user following the same model:

-+----------------------+-----------+------------------------------------------+
-| field                | type      | description                              |
-+======================+===========+==========================================+
-| ``type_variety``     | (string)  | a unique name to ID the fiber in the     |
-|                      |           | JSON or Excel template topology input    |
-|                      |           | file                                     |
-+----------------------+-----------+------------------------------------------+
-| ``dispersion``       | (number)  | In :math:`s \times m^{-1} \times m^{-1}`.|
-+----------------------+-----------+------------------------------------------+
-| ``dispersion_slope`` | (number)  | In :math:`s \times m^{-1} \times m^{-1}  |
-|                      |           | \times m^{-1}`                           |
-+----------------------+-----------+------------------------------------------+
-| ``effective_area``   | (number)  | Effective area of the fiber (not just    |
-|                      |           | the MFD circle). This is the             |
-|                      |           | :math:`A_{eff}`, see e.g., the           |
-|                      |           | `Corning whitepaper on MFD/EA`_.         |
-|                      |           | Specified in :math:`m^{2}`.              |
-+----------------------+-----------+------------------------------------------+
-| ``gamma``            | (number)  | Coefficient :math:`\gamma = 2\pi\times   |
-|                      |           | n^2/(\lambda*A_{eff})`.                  |
-|                      |           | If not provided, this will be derived    |
-|                      |           | from the ``effective_area``              |
-|                      |           | :math:`A_{eff}`.                         |
-|                      |           | In :math:`w^{-1} \times m^{-1}`.         |
-+----------------------+-----------+------------------------------------------+
-| ``pmd_coef``         | (number)  | Polarization mode dispersion (PMD)       |
-|                      |           | coefficient. In                          |
-|                      |           | :math:`s\times\sqrt{m}^{-1}`.            |
-+----------------------+-----------+------------------------------------------+
-| ``lumped_losses``    | (array)   | Places along the fiber length with extra |
-|                      |           | losses. Specified as a loss in dB at     |
-|                      |           | each relevant position (in km):          |
-|                      |           | ``{"position": 10, "loss": 1.5}``)       |
-+----------------------+-----------+------------------------------------------+
+------------------------------+-----------------+------------------------------------------------+
+| field                        | type            | description                                    |
+==============================+=================+================================================+
+| ``type_variety``             | (string)        | a unique name to ID the fiber in the           |
+|                              |                 | JSON or Excel template topology input          |
+|                              |                 | file                                           |
+------------------------------+-----------------+------------------------------------------------+
+| ``dispersion``               | (number)        | In :math:`s \times m^{-1} \times m^{-1}`.      |
+------------------------------+-----------------+------------------------------------------------+
+| ``dispersion_slope``         | (number)        | In :math:`s \times m^{-1} \times m^{-1}        |
+|                              |                 | \times m^{-1}`                                 |
+------------------------------+-----------------+------------------------------------------------+
+| ``dispersion_per_frequency`` | (dict)          | Dictionary of dispersion values evaluated at   |
+|                              |                 | various frequencies, as follows:               |
+|                              |                 | ``{"value": [], "frequency": []}``.            |
+|                              |                 | ``value`` in                                   |
+|                              |                 | :math:`s \times m^{-1} \times m^{-1}` and      |
+|                              |                 | ``frequency`` in Hz.                           |
+------------------------------+-----------------+------------------------------------------------+
+| ``effective_area``           | (number)        | Effective area of the fiber (not just          |
+|                              |                 | the MFD circle). This is the                   |
+|                              |                 | :math:`A_{eff}`, see e.g., the                 |
+|                              |                 | `Corning whitepaper on MFD/EA`_.               |
+|                              |                 | Specified in :math:`m^{2}`.                    |
+------------------------------+-----------------+------------------------------------------------+
+| ``gamma``                    | (number)        | Coefficient :math:`\gamma = 2\pi\times         |
+|                              |                 | n^2/(\lambda*A_{eff})`.                        |
+|                              |                 | If not provided, this will be derived          |
+|                              |                 | from the ``effective_area``                    |
+|                              |                 | :math:`A_{eff}`.                               |
+|                              |                 | In :math:`w^{-1} \times m^{-1}`.               |
+|                              |                 | This quantity is evaluated at the              |
+|                              |                 | reference frequency and it is scaled           |
+|                              |                 | along frequency accordingly to the             |
+|                              |                 | effective area scaling.                        |
+------------------------------+-----------------+------------------------------------------------+
+| ``pmd_coef``                 | (number)        | Polarization mode dispersion (PMD)             |
+|                              |                 | coefficient. In                                |
+|                              |                 | :math:`s\times\sqrt{m}^{-1}`.                  |
+------------------------------+-----------------+------------------------------------------------+
+| ``lumped_losses``            | (array)         | Places along the fiber length with extra       |
+|                              |                 | losses. Specified as a loss in dB at           |
+|                              |                 | each relevant position (in km):                |
+|                              |                 | ``{"position": 10, "loss": 1.5}``)             |
+------------------------------+-----------------+------------------------------------------------+
+| ``raman_coefficient``        | (dict)          | The fundamental parameter that describes       |
+|                              |                 | the regulation of the power transfer           |
+|                              |                 | between channels during fiber propagation      |
+|                              |                 | is the Raman gain coefficient (see             |
+|                              |                 | :cite:`DAmicoJLT2022` for further              |
+|                              |                 | details); :math:`f_{ref}` represents the       |
+|                              |                 | pump reference frequency used for the          |
+|                              |                 | Raman gain coefficient profile                 |
+|                              |                 | measurement ("reference_frequency"),           |
+|                              |                 | :math:`\Delta f` is the frequency shift        |
+|                              |                 | between the pump and the specific Stokes       |
+|                              |                 | wave, the Raman gain coefficient               |
+|                              |                 | in terms of optical power                      |
+|                              |                 | :math:`g_0`, expressed in                      |
+|                              |                 | :math:`1/(m\;W)`.                              |
+|                              |                 | Default values measured for a SSMF are         |
+|                              |                 | considered when not specified.                 |
+------------------------------+-----------------+------------------------------------------------+

 .. _Corning whitepaper on MFD/EA: https://www.corning.com/microsites/coc/oem/documents/specialty-fiber/WP7071-Mode-Field-Diam-and-Eff-Area.pdf

@@ -176,36 +205,36 @@ ROADM

 The user can only modify the value of existing parameters:

-+--------------------------+-----------+---------------------------------------------+
-| field                    |   type    | description                                 |
-+==========================+===========+=============================================+
-| ``target_pch_out_db``    | (number)  | Auto-design sets the ROADM egress channel   |
-|                          |           | power. This reflects typical control loop   |
-|                          |           | algorithms that adjust ROADM losses to      |
-|                          |           | equalize channels (eg coming from different |
-|                          |           | ingress direction or add ports)             |
-|                          |           | This is the default value                   |
-|                          |           | Roadm/params/target_pch_out_db if no value  |
-|                          |           | is given in the ``Roadm`` element in the    |
-|                          |           | topology input description.                 |
-|                          |           | This default value is ignored if a          |
-|                          |           | params/target_pch_out_db value is input in  |
-|                          |           | the topology for a given ROADM.             |
-+--------------------------+-----------+---------------------------------------------+
-| ``add_drop_osnr``        | (number)  | OSNR contribution from the add/drop ports   |
-+--------------------------+-----------+---------------------------------------------+
-| ``pmd``                  | (number)  | Polarization mode dispersion (PMD). (s)     |
-+--------------------------+-----------+---------------------------------------------+
-| ``restrictions``         | (dict of  | If non-empty, keys ``preamp_variety_list``  |
-|                          |  strings) | and ``booster_variety_list`` represent      |
-|                          |           | list of ``type_variety`` amplifiers which   |
-|                          |           | are allowed for auto-design within ROADM's  |
-|                          |           | line degrees.                               |
-|                          |           |                                             |
-|                          |           | If no booster should be placed on a degree, |
-|                          |           | insert a ``Fused`` node on the degree       |
-|                          |           | output.                                     |
-+--------------------------+-----------+---------------------------------------------+
+-------------------------------+-----------+----------------------------------------------------+
+| field                         |   type    | description                                        |
+===============================+===========+====================================================+
+| ``target_pch_out_db``         | (number)  | Default :ref:`equalization strategy<equalization>` |
+| or                            |           | for this ROADM type.                               |
+| ``target_psd_out_mWperGHz``   |           |                                                    |
+| or                            |           | Auto-design sets the ROADM egress channel          |
+| ``target_out_mWperSlotWidth`` |           | power. This reflects typical control loop          |
+| (mutually exclusive)          |           | algorithms that adjust ROADM losses to             |
+|                               |           | equalize channels (e.g., coming from               |
+|                               |           | different ingress direction or add ports).         |
+|                               |           |                                                    |
+|                               |           | These values are used as defaults when no          |
+|                               |           | overrides are set per each ``Roadm``               |
+|                               |           | element in the network topology.                   |
+-------------------------------+-----------+----------------------------------------------------+
+| ``add_drop_osnr``             | (number)  | OSNR contribution from the add/drop ports          |
+-------------------------------+-----------+----------------------------------------------------+
+| ``pmd``                       | (number)  | Polarization mode dispersion (PMD). (s)            |
+-------------------------------+-----------+----------------------------------------------------+
+| ``restrictions``              | (dict of  | If non-empty, keys ``preamp_variety_list``         |
+|                               |  strings) | and ``booster_variety_list`` represent             |
+|                               |           | list of ``type_variety`` amplifiers which          |
+|                               |           | are allowed for auto-design within ROADM's         |
+|                               |           | line degrees.                                      |
+|                               |           |                                                    |
+|                               |           | If no booster should be placed on a degree,        |
+|                               |           | insert a ``Fused`` node on the degree              |
+|                               |           | output.                                            |
+-------------------------------+-----------+----------------------------------------------------+

 Global parameters
 -----------------
@@ -223,6 +252,9 @@ For amplifiers defined in the topology JSON input but whose ``gain = 0`` (placeh
 The file ``sim_params.json`` contains the tuning parameters used within both the ``gnpy.science_utils.RamanSolver`` and
 the ``gnpy.science_utils.NliSolver`` for the evaluation of the Raman profile and the NLI generation, respectively.

+If amplifiers don't have settings, auto-design also sets amplifiers gain, output VOA and target powers according to [J. -L. Auge, V. Curri and E. Le Rouzic, Open Design for Multi-Vendor Optical Networks, OFC 2019](https://ieeexplore.ieee.org/document/8696699), equation 4.
+See ``delta_power_range_db`` for more explaination.
+
 +---------------------------------------------+-----------+---------------------------------------------+
 | field                                       |   type    | description                                 |
 +=============================================+===========+=============================================+
@@ -283,23 +315,27 @@ Span configuration is not a list (which may change in later releases) and the us
 +-------------------------------------+-----------+---------------------------------------------+
 | field                               | type      | description                                 |
 +=====================================+===========+=============================================+
-| ``power_mode``                      | (boolean) | If false, gain mode. Auto-design sets       |
-|                                     |           | amplifier gain = preceding span loss,       |
-|                                     |           | unless the amplifier exists and its         |
-|                                     |           | gain > 0 in the topology input JSON.        |
-|                                     |           | If true, power mode (recommended for        |
-|                                     |           | auto-design and power sweep.)               |
-|                                     |           | Auto-design sets amplifier power            |
-|                                     |           | according to delta_power_range. If the      |
-|                                     |           | amplifier exists with gain > 0 in the       |
-|                                     |           | topology JSON input, then its gain is       |
-|                                     |           | translated into a power target/channel.     |
-|                                     |           | Moreover, when performing a power sweep     |
-|                                     |           | (see ``power_range_db`` in the SI           |
-|                                     |           | configuration library) the power sweep      |
-|                                     |           | is performed w/r/t this power target,       |
-|                                     |           | regardless of preceding amplifiers          |
-|                                     |           | power saturation/limitations.               |
+| ``power_mode``                      | (boolean) | If false, **gain mode**. In the gain mode,  |
+|                                     |           | only gain settings are used for             |
+|                                     |           | propagation, and ``delta_p`` is ignored.    |
+|                                     |           | If no ``gain_target`` is set in an          |
+|                                     |           | amplifier, auto-design computes one         |
+|                                     |           | according to the ``delta_power_range``      |
+|                                     |           | optimisation range.                         |
+|                                     |           | The gain mode                               |
+|                                     |           | is recommended if all the amplifiers        |
+|                                     |           | have already consistent gain settings in    |
+|                                     |           | the topology input file.                    |
+|                                     |           |                                             |
+|                                     |           | If true, **power mode**. In the power mode, |
+|                                     |           | only the ``delta_p`` is used for            |
+|                                     |           | propagation, and ``gain_target`` is         |
+|                                     |           | ignored.                                    |
+|                                     |           | The power mode is recommended for           |
+|                                     |           | auto-design and power sweep.                |
+|                                     |           | If no ``delta_p``  is set,                  |
+|                                     |           | auto-design sets an amplifier power target  |
+|                                     |           | according to delta_power_range_db.          |
 +-------------------------------------+-----------+---------------------------------------------+
 | ``delta_power_range_db``            | (number)  | Auto-design only, power-mode                |
 |                                     |           | only. Specifies the [min, max, step]        |
@@ -404,9 +440,9 @@ Span configuration is not a list (which may change in later releases) and the us
 SpectralInformation
 ~~~~~~~~~~~~~~~~~~~

-The user can only modify the value of existing parameters.
-It defines a spectrum of N identical carriers.
-While the code libraries allow for different carriers and power levels, the current user parametrization only allows one carrier type and one power/channel definition.
+GNPy requires a description of all channels that are propagated through the network.
+Flexgrid channel partitioning is available since the 2.7 release via the extra ``--spectrum`` option.
+In the simplest case, homogeneous channel allocation can be defined via the ``SpectralInformation`` construct which defines a spectrum of N identical carriers:

 +----------------------+-----------+-------------------------------------------+
 | field                |   type    | description                               |
@@ -427,11 +463,20 @@ While the code libraries allow for different carriers and power levels, the curr
 +----------------------+-----------+-------------------------------------------+
 | ``tx_osnr``          | (number)  | In dB. OSNR out from transponder.         |
 +----------------------+-----------+-------------------------------------------+
-| ``power_dbm``        | (number)  | Reference channel power. In gain mode     |
-|                      |           | (see spans/power_mode = false), all gain  |
-|                      |           | settings are offset w/r/t this reference  |
-|                      |           | power. In power mode, it is the           |
-|                      |           | reference power for                       |
+| ``power_dbm``        | (number)  | Reference channel power, in dBm.          |
+|                      |           | In gain mode                              |
+|                      |           | (see spans/power_mode = false), if no     |
+|                      |           | gain is set in an amplifier, auto-design  |
+|                      |           | sets gain to meet this reference          |
+|                      |           | power. If amplifiers gain is set,         |
+|                      |           | ``power_dbm`` is                          |
+|                      |           | ignored.                                  |
+|                      |           |                                           |
+|                      |           | In power mode, the ``power_dbm``          |
+|                      |           | is the reference power for                |
+|                      |           | the ``delta_p`` settings in amplifiers.   |
+|                      |           | It is also the reference power for        |
+|                      |           | auto-design power optimisation range      |
 |                      |           | Spans/delta_power_range_db. For example,  |
 |                      |           | if delta_power_range_db = `[0,0,0]`, the  |
 |                      |           | same power=power_dbm is launched in every |
@@ -439,12 +484,166 @@ While the code libraries allow for different carriers and power levels, the curr
 |                      |           | with the power_dbm value: even if a       |
 |                      |           | power sweep is defined (see after) the    |
 |                      |           | design is not repeated.                   |
+|                      |           |                                           |
+|                      |           | If the ``--power`` CLI option is used,    |
+|                      |           | its value replaces this parameter.        |
 +----------------------+-----------+-------------------------------------------+
-| ``power_range_db``   | (number)  | Power sweep excursion around power_dbm.   |
-|                      |           | It is not the min and max channel power   |
-|                      |           | values! The reference power becomes:      |
+| ``power_range_db``   | (number)  | Power sweep excursion around              |
+|                      |           | ``power_dbm``.                            |
+|                      |           | This defines a list of reference powers   |
+|                      |           | to run the propagation, in the range      |
 |                      |           | power_range_db + power_dbm.               |
+|                      |           | Power sweep uses the ``delta_p`` targets  |
+|                      |           | or, if they have not been set, the ones   |
+|                      |           | computed by auto-design, regardless of    |
+|                      |           | of preceding amplifiers' power            |
+|                      |           | saturation.                               |
+|                      |           |                                           |
+|                      |           | Power sweep is an easy way to find the    |
+|                      |           | optimal reference power.                  |
+|                      |           |                                           |
+|                      |           | Power sweep excursion is ignored in case  |
+|                      |           | of gain mode.                             |
 +----------------------+-----------+-------------------------------------------+
 | ``sys_margins``      | (number)  | In dB. Added margin on min required       |
 |                      |           | transceiver OSNR.                         |
 +----------------------+-----------+-------------------------------------------+
+
+.. _mixed-rate:
+
+Arbitrary channel definition
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Non-uniform channels are defined via a list of spectrum "partitions" which are defined in an extra JSON file via the ``--spectrum`` option.
+In this approach, each partition is internally homogeneous, but different partitions might use different channel widths, power targets, modulation rates, etc.
+
+----------------------+-----------+-------------------------------------------+
+| field                |   type    | description                               |
+======================+===========+===========================================+
+| ``f_min``,           | (number)  | In Hz. Mandatory.                         |
+| ``f_max``            |           | Define partition :math:`f_{min}` is       |
+|                      |           | the first carrier central frequency       |
+|                      |           | :math:`f_{max}` is the last one.          |
+|                      |           | :math:`f_{min}` -:math:`f_{max}`          |
+|                      |           | partitions must not overlap.              |
+|                      |           |                                           |
+|                      |           | Note that the meaning of ``f_min`` and    |
+|                      |           | ``f_max`` is different than the one in    |
+|                      |           | ``SpectralInformation``.                  |
+----------------------+-----------+-------------------------------------------+
+| ``baud_rate``        | (number)  | In Hz. Mandatory. Simulated baud rate.    |
+----------------------+-----------+-------------------------------------------+
+| ``slot_width``       | (number)  | In Hz. Carrier spectrum occupation.       |
+|                      |           | Carriers of this partition are spaced at  |
+|                      |           | ``slot_width`` offsets.                   |
+----------------------+-----------+-------------------------------------------+
+| ``roll_off``         | (number)  | Pure number between 0 and 1. Mandatory    |
+|                      |           | TX signal roll-off shape. Used by         |
+|                      |           | Raman-aware simulation code.              |
+----------------------+-----------+-------------------------------------------+
+| ``tx_osnr``          | (number)  | In dB. Optional. OSNR out from            |
+|                      |           | transponder. Default value is 40 dB.      |
+----------------------+-----------+-------------------------------------------+
+| ``delta_pdb``        | (number)  | In dB. Optional. Power offset compared to |
+|                      |           | the reference power used for design       |
+|                      |           | (SI block in equipment library) to be     |
+|                      |           | applied by ROADM to equalize the carriers |
+|                      |           | in this partition. Default value is 0 dB. |
+----------------------+-----------+-------------------------------------------+
+
+For example this example:
+
+.. code-block:: json
+
+ {
+   "SI":[
+     {
+       "f_min": 191.4e12,
+       "f_max":193.1e12,
+       "baud_rate": 32e9,
+       "slot_width": 50e9,
+       "roll_off": 0.15,
+       "tx_osnr": 40
+     },
+     {
+       "f_min": 193.1625e12,
+       "f_max":195e12,
+       "baud_rate": 64e9,
+       "delta_pdb": 3,
+       "slot_width": 75e9,
+       "roll_off": 0.15,
+       "tx_osnr": 40
+     }
+   ]
+ }
+
+...defines a spectrum split into two parts.
+Carriers with central frequencies ranging from 191.4 THz to 193.1 THz will have 32 GBaud rate and will be spaced by 50 Ghz.
+Carriers with central frequencies ranging from 193.1625 THz to 195 THz will have 64 GBaud rate and will be spaced by 75 GHz with 3 dB power offset.
+
+If the SI reference carrier is set to ``power_dbm`` = 0dBm, and the ROADM has ``target_pch_out_db`` set to -20 dBm, then all channels ranging from 191.4 THz to 193.1 THz will have their power equalized to -20 + 0 dBm (due to the 0 dB power offset).
+All channels ranging from 193.1625 THz to 195 THz will have their power equalized to -20 + 3 = -17 dBm (total power signal + noise).
+
+Note that first carrier of the second partition has center frequency 193.1625 THz (its spectrum occupation ranges from 193.125 THz to 193.2 THz).
+The last carrier of the second partition has center frequency 193.1 THz and spectrum occupation ranges from 193.075 THz to 193.125 THz.
+There is no overlap of the occupation and both share the same boundary.
+
+.. _equalization:
+
+Equalization choices
+~~~~~~~~~~~~~~~~~~~~
+
+ROADMs typically equalize the optical power across multiple channels using one of the available equalization strategies — either targeting a specific output power, or a specific power spectral density (PSD), or a spectfic power spectral density using slot_width as spectrum width reference (PSW).
+All of these strategies can be adjusted by a per-channel power offset.
+The equalization strategy can be defined globally per a ROADM model, or per each ROADM instance in the topology, and within a ROADM also on a per-degree basis.
+
+Let's consider some example for the equalization. Suppose that the types of signal to be propagated are the following:
+
+.. code-block:: json
+
+   {
+        "baud_rate": 32e9,
+        "f_min":191.3e12,
+        "f_max":192.3e12,
+        "spacing": 50e9,
+        "label": 1
+    },
+    {
+        "baud_rate": 64e9,
+        "f_min":193.3e12,
+        "f_max":194.3e12,
+        "spacing": 75e9,
+        "label": 2
+    }
+
+
+with the PSD equalization in a ROADM:
+
+.. code-block:: json
+
+    {
+      "uid": "roadm A",
+      "type": "Roadm",
+      "params": {
+        "target_psd_out_mWperGHz": 3.125e-4,
+      }
+    },
+
+
+This means that power out of the ROADM will be computed as 3.125e-4 * 32 = 0.01 mW ie -20 dBm for label 1 types of carriers
+and 3.125e4 * 64 = 0.02 mW ie -16.99 dBm for label2 channels. So a ratio of ~ 3 dB between target powers for these carriers.
+
+With the PSW equalization:
+
+.. code-block:: json
+
+    {
+      "uid": "roadm A",
+      "type": "Roadm",
+      "params": {
+        "target_out_mWperSlotWidth": 2.0e-4,
+      }
+    },
+
+the power out of the ROADM will be computed as 2.0e-4 * 50 = 0.01 mW ie -20 dBm for label 1 types of carriers
+and 2.0e4 * 75 = 0.015 mW ie -18.24 dBm for label2 channels. So a ratio of ~ 1.76 dB between target powers for these carriers.
--- a/docs/model.rst
+++ b/docs/model.rst
@@ -126,9 +126,9 @@ that can be easily evaluated extending the FWM theory from a set of discrete
 tones - the standard FWM theory introduced back in the 90s by Inoue
 :cite:`Innoue-FWM`- to a continuity of tones, possibly spectrally shaped.
 Signals propagating in the fiber are not equivalent to Gaussian noise, but
-thanks to the absence of in-line compensation for choromatic dispersion, the
+thanks to the absence of in-line compensation for chromatic dispersion, the
 become so, over short distances.  So, the Gaussian noise model with incoherent
-accumulation of NLI has estensively proved to be a quick yet accurate and
+accumulation of NLI has extensively proved to be a quick yet accurate and
 conservative tool to estimate propagation impairments of fiber propagation.
 Note that the GN-model has not been derived with the aim of an *exact*
 performance estimation, but to pursue a conservative performance prediction.
--- a/gnpy/init.py
+++ b/gnpy/init.py
@@ -1,8 +1,8 @@
-'''
+"""
 GNPy is an open-source, community-developed library for building route planning and optimization tools in real-world mesh optical networks. It is based on the Gaussian Noise Model.

 Signal propagation is implemented in :py:mod:`.core`.
 Path finding and spectrum assignment is in :py:mod:`.topology`.
 Various tools and auxiliary code, including the JSON I/O handling, is in
 :py:mod:`.tools`.
-'''
+"""
--- a/gnpy/core/init.py
+++ b/gnpy/core/init.py
@@ -1,4 +1,4 @@
-'''
+"""
 Simulation of signal propagation in the DWDM network

 Optical signals, as defined via :class:`.info.SpectralInformation`, enter
@@ -6,4 +6,4 @@ Optical signals, as defined via :class:`.info.SpectralInformation`, enter
 through the :py:mod:`.network`.
 The simulation is controlled via :py:mod:`.parameters` and implemented mainly
 via :py:mod:`.science_utils`.
-'''
+"""
--- a/gnpy/core/ansi_escapes.py
+++ b/gnpy/core/ansi_escapes.py
@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

-'''
+"""
 gnpy.core.ansi_escapes
 ======================

 A random subset of ANSI terminal escape codes for colored messages
-'''
+"""

 red = '\x1b[1;31;40m'
 blue = '\x1b[1;34;40m'
--- a/gnpy/core/elements.py
+++ b/gnpy/core/elements.py
@@ -21,16 +21,22 @@ instance as a result.
 """

 from numpy import abs, array, errstate, ones, interp, mean, pi, polyfit, polyval, sum, sqrt, log10, exp, asarray, full,\
-    squeeze, zeros, append, flip, outer
+    squeeze, zeros, append, flip, outer, ndarray
 from scipy.constants import h, c
 from scipy.interpolate import interp1d
 from collections import namedtuple
+from typing import Union
+from logging import getLogger

-from gnpy.core.utils import lin2db, db2lin, arrange_frequencies, snr_sum, watt2dbm
+from gnpy.core.utils import lin2db, db2lin, arrange_frequencies, snr_sum, per_label_average, pretty_summary_print, \
+    watt2dbm, psd2powerdbm
 from gnpy.core.parameters import RoadmParams, FusedParams, FiberParams, PumpParams, EdfaParams, EdfaOperational
 from gnpy.core.science_utils import NliSolver, RamanSolver
-from gnpy.core.info import SpectralInformation
-from gnpy.core.exceptions import NetworkTopologyError, SpectrumError
+from gnpy.core.info import SpectralInformation, ReferenceCarrier
+from gnpy.core.exceptions import NetworkTopologyError, SpectrumError, ParametersError
+
+
+_logger = getLogger(__name__)


 class Location(namedtuple('Location', 'latitude longitude city region')):
@@ -39,11 +45,11 @@ class Location(namedtuple('Location', 'latitude longitude city region')):


 class _Node:
-    '''Convenience class for providing common functionality of all network elements
+    """Convenience class for providing common functionality of all network elements

    This class is just an internal implementation detail; do **not** assume that all network elements
    inherit from :class:`_Node`.
-    '''
+    """
    def __init__(self, uid, name=None, params=None, metadata=None, operational=None, type_variety=None):
        if name is None:
            name = uid
@@ -84,11 +90,13 @@ class Transceiver(_Node):
        self.chromatic_dispersion = None
        self.pmd = None
        self.pdl = None
+        self.latency = None
        self.penalties = {}
        self.total_penalty = 0
+        self.propagated_labels = [""]

    def _calc_cd(self, spectral_info):
-        """ Updates the Transceiver property with the CD of the received channels. CD in ps/nm.
+        """Updates the Transceiver property with the CD of the received channels. CD in ps/nm.
        """
        self.chromatic_dispersion = spectral_info.chromatic_dispersion * 1e3

@@ -102,6 +110,11 @@ class Transceiver(_Node):
        """
        self.pdl = spectral_info.pdl

+    def _calc_latency(self, spectral_info):
+        """Updates the Transceiver property with the latency of the received channels. Latency in ms.
+        """
+        self.latency = spectral_info.latency * 1e3
+
    def _calc_penalty(self, impairment_value, boundary_list):
        return interp(impairment_value, boundary_list['up_to_boundary'], boundary_list['penalty_value'],
                      left=float('inf'), right=float('inf'))
@@ -116,6 +129,7 @@ class Transceiver(_Node):

    def _calc_snr(self, spectral_info):
        with errstate(divide='ignore'):
+            self.propagated_labels = spectral_info.label
            self.baud_rate = spectral_info.baud_rate
            ratio_01nm = lin2db(12.5e9 / self.baud_rate)
            # set raw values to record original calculation, before update_snr()
@@ -167,29 +181,31 @@ class Transceiver(_Node):
                f'chromatic_dispersion={self.chromatic_dispersion!r}, '
                f'pmd={self.pmd!r}, '
                f'pdl={self.pdl!r}, '
+                f'latency={self.latency!r}, '
                f'penalties={self.penalties!r})')

    def __str__(self):
        if self.snr is None or self.osnr_ase is None:
            return f'{type(self).__name__} {self.uid}'

-        snr = round(mean(self.snr), 2)
-        osnr_ase = round(mean(self.osnr_ase), 2)
-        osnr_ase_01nm = round(mean(self.osnr_ase_01nm), 2)
-        snr_01nm = round(mean(self.snr_01nm), 2)
+        snr = per_label_average(self.snr, self.propagated_labels)
+        osnr_ase = per_label_average(self.osnr_ase, self.propagated_labels)
+        osnr_ase_01nm = per_label_average(self.osnr_ase_01nm, self.propagated_labels)
+        snr_01nm = per_label_average(self.snr_01nm, self.propagated_labels)
        cd = mean(self.chromatic_dispersion)
        pmd = mean(self.pmd)
        pdl = mean(self.pdl)
+        latency = mean(self.latency)

        result = '\n'.join([f'{type(self).__name__} {self.uid}',
-
-                          f'  GSNR (0.1nm, dB):          {snr_01nm:.2f}',
-                          f'  GSNR (signal bw, dB):      {snr:.2f}',
-                          f'  OSNR ASE (0.1nm, dB):      {osnr_ase_01nm:.2f}',
-                          f'  OSNR ASE (signal bw, dB):  {osnr_ase:.2f}',
-                          f'  CD (ps/nm):                {cd:.2f}',
-                          f'  PMD (ps):                  {pmd:.2f}',
-                          f'  PDL (dB):                  {pdl:.2f}'])
+                            f'  GSNR (0.1nm, dB):          {pretty_summary_print(snr_01nm)}',
+                            f'  GSNR (signal bw, dB):      {pretty_summary_print(snr)}',
+                            f'  OSNR ASE (0.1nm, dB):      {pretty_summary_print(osnr_ase_01nm)}',
+                            f'  OSNR ASE (signal bw, dB):  {pretty_summary_print(osnr_ase)}',
+                            f'  CD (ps/nm):                {cd:.2f}',
+                            f'  PMD (ps):                  {pmd:.2f}',
+                            f'  PDL (dB):                  {pdl:.2f}',
+                            f'  Latency (ms):              {latency:.2f}'])

        cd_penalty = self.penalties.get('chromatic_dispersion')
        if cd_penalty is not None:
@@ -208,6 +224,7 @@ class Transceiver(_Node):
        self._calc_cd(spectral_info)
        self._calc_pmd(spectral_info)
        self._calc_pdl(spectral_info)
+        self._calc_latency(spectral_info)
        return spectral_info


@@ -215,71 +232,188 @@ class Roadm(_Node):
    def __init__(self, *args, params=None, **kwargs):
        if not params:
            params = {}
-        super().__init__(*args, params=RoadmParams(**params), **kwargs)
-        self.ref_pch_out_dbm = self.params.target_pch_out_db
+        try:
+            super().__init__(*args, params=RoadmParams(**params), **kwargs)
+        except ParametersError as e:
+            msg = f'Config error in {kwargs["uid"]}: {e}'
+            raise ParametersError(msg) from e
+
+        # Target output power for the reference carrier, can only be computed on the fly, because it depends
+        # on the path, since it depends on the equalization definition on the degree.
+        self.ref_pch_out_dbm = None
        self.loss = 0  # auto-design interest
-        self.effective_loss = None
+
+        # Optical power of carriers are equalized by the ROADM, so that the experienced loss is not the same for
+        # different carriers. The ref_effective_loss records the loss for a reference carrier.
+        self.ref_effective_loss = None
+
        self.passive = True
        self.restrictions = self.params.restrictions
+        self.propagated_labels = [""]
+        # element contains the two types of equalisation parameters, but only one is not None or empty
+        # target for equalization for the ROADM only one must be not None
+        self.target_pch_out_dbm = self.params.target_pch_out_db
+        self.target_psd_out_mWperGHz = self.params.target_psd_out_mWperGHz
+        self.target_out_mWperSlotWidth = self.params.target_out_mWperSlotWidth
        self.per_degree_pch_out_dbm = self.params.per_degree_pch_out_db
+        self.per_degree_pch_psd = self.params.per_degree_pch_psd
+        self.per_degree_pch_psw = self.params.per_degree_pch_psw

    @property
    def to_json(self):
-        return {'uid': self.uid,
-                'type': type(self).__name__,
-                'params': {
-                    'target_pch_out_db': self.ref_pch_out_dbm,
-                    'restrictions': self.restrictions,
-                    'per_degree_pch_out_db': self.per_degree_pch_out_dbm
-                    },
-                'metadata': {
-                    'location': self.metadata['location']._asdict()
-                }
-                }
+        if self.target_pch_out_dbm is not None:
+            equalisation, value = 'target_pch_out_db', self.target_pch_out_dbm
+        elif self.target_psd_out_mWperGHz is not None:
+            equalisation, value = 'target_psd_out_mWperGHz', self.target_psd_out_mWperGHz
+        elif self.target_out_mWperSlotWidth is not None:
+            equalisation, value = 'target_out_mWperSlotWidth', self.target_out_mWperSlotWidth
+        else:
+            assert False, 'There must be one default equalization defined in ROADM'
+        to_json = {
+            'uid': self.uid,
+            'type': type(self).__name__,
+            'params': {
+                equalisation: value,
+                'restrictions': self.restrictions,
+            },
+            'metadata': {
+                'location': self.metadata['location']._asdict()
+            }
+        }
+        # several per_degree equalization may coexist on different degrees
+        if self.per_degree_pch_out_dbm:
+            to_json['params']['per_degree_pch_out_db'] = self.per_degree_pch_out_dbm
+        if self.per_degree_pch_psd:
+            to_json['params']['per_degree_psd_out_mWperGHz'] = self.per_degree_pch_psd
+        if self.per_degree_pch_psw:
+            to_json['params']['per_degree_psd_out_mWperSlotWidth'] = self.per_degree_pch_psw
+        return to_json

    def __repr__(self):
        return f'{type(self).__name__}(uid={self.uid!r}, loss={self.loss!r})'

    def __str__(self):
-        if self.effective_loss is None:
+        if self.ref_effective_loss is None:
            return f'{type(self).__name__} {self.uid}'

+        total_pch = pretty_summary_print(per_label_average(self.pch_out_dbm, self.propagated_labels))
        return '\n'.join([f'{type(self).__name__} {self.uid}',
-                          f'  effective loss (dB):  {self.effective_loss:.2f}',
-                          f'  pch out (dBm):        {self.ref_pch_out_dbm:.2f}'])
+                          f'  effective loss (dB):     {self.ref_effective_loss:.2f}',
+                          f'  reference pch out (dBm): {self.ref_pch_out_dbm:.2f}',
+                          f'  actual pch out (dBm):    {total_pch}'])
+
+    def get_roadm_target_power(self, ref_carrier: ReferenceCarrier = None,
+                               spectral_info: SpectralInformation = None) -> Union[float, ndarray]:
+        """Computes the power in dBm for a reference carrier or for a spectral information.
+        power is computed based on equalization target.
+        if spectral_info baud_rate is baud_rate = [32e9, 42e9, 64e9, 42e9, 32e9], and
+        target_pch_out_dbm is defined to -20 dbm, then the function returns an array of powers
+        [-20, -20, -20, -20, -20]
+        if target_psd_out_mWperGHz is defined instead with 3.125e-4mW/GHz then it returns
+        [-20, -18.819, -16.9897, -18.819, -20]
+        if instead a reference_baud_rate is defined, the functions computes the result for a
+        single reference carrier whose baud_rate is reference_baudrate
+        """
+        if spectral_info:
+            if self.target_pch_out_dbm is not None:
+                return full(len(spectral_info.channel_number), self.target_pch_out_dbm)
+            if self.target_psd_out_mWperGHz is not None:
+                return psd2powerdbm(self.target_psd_out_mWperGHz, spectral_info.baud_rate)
+            if self.target_out_mWperSlotWidth is not None:
+                return psd2powerdbm(self.target_out_mWperSlotWidth, spectral_info.slot_width)
+        else:
+            if self.target_pch_out_dbm is not None:
+                return self.target_pch_out_dbm
+            if self.target_psd_out_mWperGHz is not None:
+                return psd2powerdbm(self.target_psd_out_mWperGHz, ref_carrier.baud_rate)
+            if self.target_out_mWperSlotWidth is not None:
+                return psd2powerdbm(self.target_out_mWperSlotWidth, ref_carrier.slot_width)
+        return None
+
+    def get_per_degree_ref_power(self, degree, ref_carrier):
+        """Get the target power in dBm out of ROADM degree for the reference bandwidth
+        If no equalization is defined on this degree use the ROADM level one.
+        """
+        if degree in self.per_degree_pch_out_dbm:
+            return self.per_degree_pch_out_dbm[degree]
+        elif degree in self.per_degree_pch_psd:
+            return psd2powerdbm(self.per_degree_pch_psd[degree], ref_carrier.baud_rate)
+        elif degree in self.per_degree_pch_psw:
+            return psd2powerdbm(self.per_degree_pch_psw[degree], ref_carrier.slot_width)
+        return self.get_roadm_target_power(ref_carrier)
+
+    def get_per_degree_power(self, degree, spectral_info):
+        """Get the target power in dBm out of ROADM degree for the spectral information
+        If no equalization is defined on this degree use the ROADM level one.
+        """
+        if degree in self.per_degree_pch_out_dbm:
+            return self.per_degree_pch_out_dbm[degree]
+        elif degree in self.per_degree_pch_psd:
+            return psd2powerdbm(self.per_degree_pch_psd[degree], spectral_info.baud_rate)
+        elif degree in self.per_degree_pch_psw:
+            return psd2powerdbm(self.per_degree_pch_psw[degree], spectral_info.slot_width)
+        return self.get_roadm_target_power(spectral_info=spectral_info)

    def propagate(self, spectral_info, degree):
-        # pin_target and loss are read from eqpt_config.json['Roadm']
-        # all ingress channels in xpress are set to this power level
-        # but add channels are not, so we define an effective loss
-        # in the case of add channels
-        # find the target power on this degree:
-        # if a target power has been defined for this degree use it else use the global one.
-        # if the input power is lower than the target one, use the input power instead because
-        # a ROADM doesn't amplify, it can only attenuate
+        """Equalization targets are read from topology file if defined and completed with default
+        definition of the library.
+        If the input power is lower than the target one, use the input power instead because
+        a ROADM doesn't amplify, it can only attenuate.
+        There is no difference for add or express : the same target is applied. For the moment
+        propagates operates with spectral info carriers all having the same source or destination.
+        """
        # TODO maybe add a minimum loss for the ROADM
-        per_degree_pch = self.per_degree_pch_out_dbm.get(degree, self.ref_pch_out_dbm)
+
+        # find the target power for the reference carrier
+        ref_per_degree_pch = self.get_per_degree_ref_power(degree, spectral_info.pref.ref_carrier)
+        # find the target powers for each signal carrier
+        per_degree_pch = self.get_per_degree_power(degree, spectral_info=spectral_info)
+
        # Definition of ref_pch_out_dbm for the reference channel:
        # Depending on propagation upstream from this ROADM, the input power (p_spani) might be smaller than
        # the target power out configured for this ROADM degree's egress. Since ROADM does not amplify,
        # the power out of the ROADM for the ref channel is the min value between target power and input power.
        # (TODO add a minimum loss for the ROADM crossing)
-        self.ref_pch_out_dbm = min(spectral_info.pref.p_spani, per_degree_pch)
+        self.ref_pch_out_dbm = min(spectral_info.pref.p_spani, ref_per_degree_pch)
        # Definition of effective_loss:
        # Optical power of carriers are equalized by the ROADM, so that the experienced loss is not the same for
-        # different carriers. effective_loss records the loss for a reference carrier.
-        self.effective_loss = spectral_info.pref.p_spani - self.ref_pch_out_dbm
+        # different carriers. effective_loss records the loss for the reference carrier.
+        self.ref_effective_loss = spectral_info.pref.p_spani - self.ref_pch_out_dbm
        input_power = spectral_info.signal + spectral_info.nli + spectral_info.ase
-        min_power = min(lin2db(input_power * 1e3))
-        per_degree_pch = per_degree_pch if per_degree_pch < min_power else min_power
-        delta_power = lin2db(input_power * 1e3) - per_degree_pch
+        target_power_per_channel = per_degree_pch + spectral_info.delta_pdb_per_channel
+        # Computation of the per channel target power according to equalization policy
+        # If target_power_per_channel has some channels power above input power, then the whole target is reduced.
+        # For example, if user specifies delta_pdb_per_channel:
+        # freq1: 1dB, freq2: 3dB, freq3: -3dB, and target is -20dBm out of the ROADM,
+        # then the target power for each channel uses the specified delta_pdb_per_channel.
+        # target_power_per_channel[f1, f2, f3] = -19, -17, -23
+        # However if input_signal = -23, -16, -26, then the target can not be applied, because
+        # -23 < -19dBm and -26 < -23dBm. Then the target is only applied to signals whose power is above the
+        # threshold. others are left unchanged and unequalized.
+        # the new target is [-23, -17, -26]
+        # and the attenuation to apply is [-23, -16, -26] - [-23, -17, -26] = [0, 1, 0]
+        # note that this changes the previous behaviour that equalized all identical channels based on the one
+        # that had the min power.
+        # This change corresponds to a discussion held during coders call. Please look at this document for
+        # a reference: https://telecominfraproject.atlassian.net/wiki/spaces/OOPT/pages/669679645/PSE+Meeting+Minutes
+        correction = (abs(watt2dbm(input_power) - target_power_per_channel)
+                      - (watt2dbm(input_power) - target_power_per_channel)) / 2
+        new_target = target_power_per_channel - correction
+        delta_power = watt2dbm(input_power) - new_target
+
        spectral_info.apply_attenuation_db(delta_power)
        spectral_info.pmd = sqrt(spectral_info.pmd ** 2 + self.params.pmd ** 2)
        spectral_info.pdl = sqrt(spectral_info.pdl ** 2 + self.params.pdl ** 2)
+        self.pch_out_dbm = watt2dbm(spectral_info.signal + spectral_info.nli + spectral_info.ase)
+        self.propagated_labels = spectral_info.label

    def update_pref(self, spectral_info):
-        spectral_info.pref = spectral_info.pref._replace(p_span0=spectral_info.pref.p_span0,
-                                                         p_spani=self.ref_pch_out_dbm)
+        """Update Reference power
+
+        This modifies the spectral info in-place. Only the `pref` is updated with new p_spani,
+        while p_span0 is not changed.
+        """
+        spectral_info.pref = spectral_info.pref._replace(p_spani=self.ref_pch_out_dbm)

    def __call__(self, spectral_info, degree):
        self.propagate(spectral_info, degree=degree)
@@ -331,21 +465,14 @@ class Fiber(_Node):
    def __init__(self, *args, params=None, **kwargs):
        if not params:
            params = {}
-        super().__init__(*args, params=FiberParams(**params), **kwargs)
+        try:
+            super().__init__(*args, params=FiberParams(**params), **kwargs)
+        except ParametersError as e:
+            msg = f'Config error in {kwargs["uid"]}: {e}'
+            raise ParametersError(msg) from e
        self.pch_out_db = None
        self.passive = True
-
-        # Raman efficiency matrix function of the delta frequency constructed such that each row is related to a
-        # fixed frequency: positive elements represent a gain (from higher frequency) and negative elements represent
-        # a loss (to lower frequency)
-        if self.params.raman_efficiency:
-            frequency_offset = self.params.raman_efficiency['frequency_offset']
-            frequency_offset = append(-flip(frequency_offset[1:]), frequency_offset)
-            cr = self.params.raman_efficiency['cr']
-            cr = append(- flip(cr[1:]), cr)
-            self._cr_function = lambda frequency: interp(frequency, frequency_offset, cr)
-        else:
-            self._cr_function = lambda frequency: zeros(squeeze(frequency).shape)
+        self.propagated_labels = [""]

        # Lumped losses
        z_lumped_losses = array([lumped['position'] for lumped in self.params.lumped_losses])  # km
@@ -384,6 +511,7 @@ class Fiber(_Node):
        if self.pch_out_db is None:
            return f'{type(self).__name__} {self.uid}'

+        total_pch = pretty_summary_print(per_label_average(self.pch_out_dbm, self.propagated_labels))
        return '\n'.join([f'{type(self).__name__}          {self.uid}',
                          f'  type_variety:                {self.type_variety}',
                          f'  length (km):                 {self.params.length * 1e-3:.2f}',
@@ -391,30 +519,35 @@ class Fiber(_Node):
                          f'  total loss (dB):             {self.loss:.2f}',
                          f'  (includes conn loss (dB) in: {self.params.con_in:.2f} out: {self.params.con_out:.2f})',
                          f'  (conn loss out includes EOL margin defined in eqpt_config.json)',
-                          f'  pch out (dBm): {self.pch_out_db:.2f}'])
+                          f'  reference pch out (dBm):     {self.pch_out_db:.2f}',
+                          f'  actual pch out (dBm):        {total_pch}'])
+
+    def interpolate_parameter_over_spectrum(self, parameter, ref_frequency, spectrum_frequency, name):
+        try:
+            interpolation = interp1d(ref_frequency, parameter)(spectrum_frequency)
+            return interpolation
+        except ValueError:
+            raise SpectrumError('The spectrum bandwidth exceeds the frequency interval used to define the fiber '
+                                f'{name} in "{type(self).__name__} {self.uid}".'
+                                f'\nSpectrum f_min-f_max: {round(spectrum_frequency[0] * 1e-12, 2)}-'
+                                f'{round(spectrum_frequency[-1] * 1e-12, 2)}'
+                                f'\n{name} f_min-f_max: {round(ref_frequency[0] * 1e-12, 2)}-'
+                                f'{round(ref_frequency[-1] * 1e-12, 2)}')

    def loss_coef_func(self, frequency):
        frequency = asarray(frequency)
        if self.params.loss_coef.size > 1:
-            try:
-                loss_coef = interp1d(self.params.f_loss_ref, self.params.loss_coef)(frequency)
-            except ValueError:
-                raise SpectrumError('The spectrum bandwidth exceeds the frequency interval used to define the fiber '
-                                    f'loss coefficient in "{type(self).__name__} {self.uid}".'
-                                    f'\nSpectrum f_min-f_max: {round(frequency[0]*1e-12,2)}-'
-                                    f'{round(frequency[-1]*1e-12,2)}'
-                                    f'\nLoss coefficient f_min-f_max: {round(self.params.f_loss_ref[0]*1e-12,2)}-'
-                                    f'{round(self.params.f_loss_ref[-1]*1e-12,2)}')
+            loss_coef = self.interpolate_parameter_over_spectrum(self.params.loss_coef, self.params.f_loss_ref,
+                                                                 frequency, 'Loss Coefficient')
        else:
            loss_coef = full(frequency.size, self.params.loss_coef)
        return squeeze(loss_coef)

-
    @property
    def loss(self):
        """total loss including padding att_in: useful for polymorphism with roadm loss"""
        return self.loss_coef_func(self.params.ref_frequency) * self.params.length + \
-            self.params.con_in + self.params.con_out + self.params.att_in
+            self.params.con_in + self.params.con_out + self.params.att_in + sum(lin2db(1 / self.lumped_losses))

    def alpha(self, frequency):
        """Returns the linear exponent attenuation coefficient such that
@@ -425,16 +558,71 @@ class Fiber(_Node):
        """
        return self.loss_coef_func(frequency) / (10 * log10(exp(1)))

+    def beta2(self, frequency=None):
+        """Returns the beta2 chromatic dispersion coefficient as the second order term of the beta function
+        expanded as a Taylor series evaluated at the given frequency
+
+        :param frequency: the frequency at which alpha is computed [Hz]
+        :return: beta2: beta2 chromatic dispersion coefficient for f in frequency # 1/(m * Hz^2)
+        """
+        frequency = asarray(self.params.ref_frequency if frequency is None else frequency)
+        if self.params.dispersion.size > 1:
+            dispersion = self.interpolate_parameter_over_spectrum(self.params.dispersion, self.params.f_dispersion_ref,
+                                                                  frequency, 'Chromatic Dispersion')
+        else:
+            if self.params.dispersion_slope is None:
+                dispersion = (frequency / self.params.f_dispersion_ref) ** 2 * self.params.dispersion
+            else:
+                wavelength = c / frequency
+                dispersion = self.params.dispersion + self.params.dispersion_slope * \
+                             (wavelength - c / self.params.f_dispersion_ref)
+        beta2 = -((c / frequency) ** 2 * dispersion) / (2 * pi * c)
+        return beta2
+
+    def beta3(self, frequency=None):
+        """Returns the beta3 chromatic dispersion coefficient as the third order term of the beta function
+        expanded as a Taylor series evaluated at the given frequency
+
+        :param frequency: the frequency at which alpha is computed [Hz]
+        :return: beta3: beta3 chromatic dispersion coefficient for f in frequency # 1/(m * Hz^3)
+        """
+        frequency = asarray(self.params.ref_frequency if frequency is None else frequency)
+        if self.params.dispersion.size > 1:
+            beta3 = polyfit(self.params.f_dispersion_ref - self.params.ref_frequency,
+                            self.beta2(self.params.f_dispersion_ref), 2)[1] / (2*pi)
+            beta3 = full(frequency.size, beta3)
+        else:
+            if self.params.dispersion_slope is None:
+                beta3 = zeros(frequency.size)
+            else:
+                dispersion_slope = self.params.dispersion_slope
+                beta2 = self.beta2(frequency)
+                beta3 = (dispersion_slope - (4 * pi * frequency ** 3 / c ** 2) * beta2) / (
+                            2 * pi * frequency ** 2 / c) ** 2
+        return beta3
+
+    def gamma(self, frequency=None):
+        """Returns the nonlinear interference coefficient such that
+        :math: `gamma(f) = 2 pi f n_2 c^{-1} A_{eff}^{-1}`
+
+        :param frequency: the frequency at which gamma is computed [Hz]
+        :return: gamma: nonlinear interference coefficient for f in frequency [1/(W m)]
+        """
+        frequency = self.params.ref_frequency if frequency is None else frequency
+        return self.params.gamma_scaling(frequency)
+
    def cr(self, frequency):
-        """Returns the raman efficiency matrix including the vibrational loss
+        """Returns the raman gain coefficient matrix including the vibrational loss

        :param frequency: the frequency at which cr is computed [Hz]
-        :return: cr: raman efficiency matrix [1 / (W m)]
+        :return: cr: raman gain coefficient matrix [1 / (W m)]
        """
        df = outer(ones(frequency.shape), frequency) - outer(frequency, ones(frequency.shape))
-        cr = self._cr_function(df)
+        effective_area_overlap = self.params.effective_area_overlap(frequency, frequency)
+        cr = interp(df, self.params.raman_coefficient.frequency_offset,
+                    self.params.raman_coefficient.normalized_gamma_raman) * frequency / effective_area_overlap
        vibrational_loss = outer(frequency, ones(frequency.shape)) / outer(ones(frequency.shape), frequency)
-        return cr * (cr >= 0) + cr * (cr < 0) * vibrational_loss  # Raman efficiency [1/(W m)]
+        return cr * (cr >= 0) + cr * (cr < 0) * vibrational_loss  # [1/(W m)]

    def chromatic_dispersion(self, freq=None):
        """Returns accumulated chromatic dispersion (CD).
@@ -443,8 +631,8 @@ class Fiber(_Node):
        :return: chromatic dispersion: the accumulated dispersion [s/m]
        """
        freq = self.params.ref_frequency if freq is None else freq
-        beta2 = self.params.beta2
-        beta3 = self.params.beta3
+        beta2 = self.beta2(freq)
+        beta3 = self.beta3(freq)
        ref_f = self.params.ref_frequency
        length = self.params.length
        beta = beta2 + 2 * pi * beta3 * (freq - ref_f)
@@ -474,6 +662,9 @@ class Fiber(_Node):
        spectral_info.chromatic_dispersion += self.chromatic_dispersion(spectral_info.frequency)
        spectral_info.pmd = sqrt(spectral_info.pmd ** 2 + self.pmd ** 2)

+        # latency
+        spectral_info.latency += self.params.latency
+
        # apply the attenuation due to the fiber losses
        attenuation_fiber = stimulated_raman_scattering.loss_profile[:, -1]
        spectral_info.apply_attenuation_lin(attenuation_fiber)
@@ -481,6 +672,8 @@ class Fiber(_Node):
        # apply the attenuation due to the output connector loss
        attenuation_out_db = self.params.con_out
        spectral_info.apply_attenuation_db(attenuation_out_db)
+        self.pch_out_dbm = watt2dbm(spectral_info.signal + spectral_info.nli + spectral_info.ase)
+        self.propagated_labels = spectral_info.label

    def update_pref(self, spectral_info):
        # in case of Raman, the resulting loss of the fiber is not equivalent to self.loss
@@ -545,6 +738,9 @@ class RamanFiber(Fiber):
        spectral_info.chromatic_dispersion += self.chromatic_dispersion(spectral_info.frequency)
        spectral_info.pmd = sqrt(spectral_info.pmd ** 2 + self.pmd ** 2)

+        # latency
+        spectral_info.latency += self.params.latency
+
        # apply the attenuation due to the fiber losses
        attenuation_fiber = stimulated_raman_scattering.loss_profile[:spectral_info.number_of_channels, -1]

@@ -553,6 +749,8 @@ class RamanFiber(Fiber):
        # apply the attenuation due to the output connector loss
        attenuation_out_db = self.params.con_out
        spectral_info.apply_attenuation_db(attenuation_out_db)
+        self.pch_out_dbm = watt2dbm(spectral_info.signal + spectral_info.nli + spectral_info.ase)
+        self.propagated_labels = spectral_info.label


 class Edfa(_Node):
@@ -581,6 +779,7 @@ class Edfa(_Node):
        self.delta_p = self.operational.delta_p  # delta P with Pref (power swwep) in power mode
        self.tilt_target = self.operational.tilt_target
        self.out_voa = self.operational.out_voa
+        self.propagated_labels = [""]

    @property
    def to_json(self):
@@ -588,7 +787,7 @@ class Edfa(_Node):
                'type': type(self).__name__,
                'type_variety': self.params.type_variety,
                'operational': {
-                    'gain_target': round(self.effective_gain, 6),
+                    'gain_target': round(self.effective_gain, 6) if self.effective_gain else None,
                    'delta_p': self.delta_p,
                    'tilt_target': self.tilt_target,
                    'out_voa': self.out_voa
@@ -614,6 +813,7 @@ class Edfa(_Node):
        if self.pin_db is None or self.pout_db is None:
            return f'{type(self).__name__} {self.uid}'
        nf = mean(self.nf)
+        total_pch = pretty_summary_print(per_label_average(self.pch_out_dbm, self.propagated_labels))
        return '\n'.join([f'{type(self).__name__} {self.uid}',
                          f'  type_variety:           {self.params.type_variety}',
                          f'  effective gain(dB):     {self.effective_gain:.2f}',
@@ -626,6 +826,7 @@ class Edfa(_Node):
                          f'  Delta_P (dB):           ' + (f'{self.delta_p:.2f}' if self.delta_p is not None else 'None'),
                          f'  target pch (dBm):       ' + (f'{self.target_pch_out_db:.2f}' if self.target_pch_out_db is not None else 'None'),
                          f'  effective pch (dBm):    {self.effective_pch_out_db:.2f}',
+                          f'  actual pch out (dBm):   {total_pch}',
                          f'  output VOA (dB):        {self.out_voa:.2f}'])

    def interpol_params(self, spectral_info):
@@ -898,6 +1099,8 @@ class Edfa(_Node):
        spectral_info.apply_gain_db(self.gprofile - self.out_voa)
        spectral_info.pmd = sqrt(spectral_info.pmd ** 2 + self.params.pmd ** 2)
        spectral_info.pdl = sqrt(spectral_info.pdl ** 2 + self.params.pdl ** 2)
+        self.pch_out_dbm = watt2dbm(spectral_info.signal + spectral_info.nli + spectral_info.ase)
+        self.propagated_labels = spectral_info.label

    def update_pref(self, spectral_info):
        spectral_info.pref = \
--- a/gnpy/core/equipment.py
+++ b/gnpy/core/equipment.py
@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

-'''
+"""
 gnpy.core.equipment
 ===================

 This module contains functionality for specifying equipment.
-'''
+"""

 from gnpy.core.utils import automatic_nch, db2lin
 from gnpy.core.exceptions import EquipmentConfigError
@@ -29,8 +29,11 @@ def trx_mode_params(equipment, trx_type_variety='', trx_mode='', error_message=F
            trx_params = {**mode_params}
            # sanity check: spacing baudrate must be smaller than min spacing
            if trx_params['baud_rate'] > trx_params['min_spacing']:
-                raise EquipmentConfigError(f'Inconsistency in equipment library:\n Transpoder "{trx_type_variety}" mode "{trx_params["format"]}" ' +
-                                           f'has baud rate {trx_params["baud_rate"]*1e-9} GHz greater than min_spacing {trx_params["min_spacing"]*1e-9}.')
+                raise EquipmentConfigError(f'Inconsistency in equipment library:\n Transponder "{trx_type_variety}"'
+                                           + f' mode "{trx_params["format"]}" has baud rate'
+                                           + f' {trx_params["baud_rate"] * 1e-9:.3f} GHz greater than min_spacing'
+                                           + f' {trx_params["min_spacing"] * 1e-9:.3f}.')
+            trx_params['equalization_offset_db'] = trx_params.get('equalization_offset_db', 0)
        else:
            mode_params = {"format": "undetermined",
                           "baud_rate": None,
@@ -40,7 +43,8 @@ def trx_mode_params(equipment, trx_type_variety='', trx_mode='', error_message=F
                           "roll_off": None,
                           "tx_osnr": None,
                           "min_spacing": None,
-                           "cost": None}
+                           "cost": None,
+                           "equalization_offset_db": 0}
            trx_params = {**mode_params}
        trx_params['f_min'] = equipment['Transceiver'][trx_type_variety].frequency['min']
        trx_params['f_max'] = equipment['Transceiver'][trx_type_variety].frequency['max']
@@ -66,9 +70,7 @@ def trx_mode_params(equipment, trx_type_variety='', trx_mode='', error_message=F
            trx_params['roll_off'] = default_si_data.roll_off
            trx_params['tx_osnr'] = default_si_data.tx_osnr
            trx_params['min_spacing'] = None
-            nch = automatic_nch(trx_params['f_min'], trx_params['f_max'], trx_params['spacing'])
-            trx_params['nb_channel'] = nch
-            print(f'There are {nch} channels propagating')
+            trx_params['equalization_offset_db'] = 0

    trx_params['power'] = db2lin(default_si_data.power_dbm) * 1e-3

--- a/gnpy/core/info.py
+++ b/gnpy/core/info.py
@@ -12,9 +12,10 @@ from __future__ import annotations
 from collections import namedtuple
 from collections.abc import Iterable
 from typing import Union
+from dataclasses import dataclass
 from numpy import argsort, mean, array, append, ones, ceil, any, zeros, outer, full, ndarray, asarray

-from gnpy.core.utils import automatic_nch, lin2db, db2lin
+from gnpy.core.utils import automatic_nch, db2lin, watt2dbm
 from gnpy.core.exceptions import SpectrumError

 DEFAULT_SLOT_WIDTH_STEP = 12.5e9  # Hz
@@ -26,33 +27,41 @@ class Power(namedtuple('Power', 'signal nli ase')):
    """carriers power in W"""


-class Channel(namedtuple('Channel',
-                         'channel_number frequency baud_rate slot_width roll_off power chromatic_dispersion pmd pdl')):
-    """ Class containing the parameters of a WDM signal.
-        :param channel_number: channel number in the WDM grid
-        :param frequency: central frequency of the signal (Hz)
-        :param baud_rate: the symbol rate of the signal (Baud)
-        :param slot_width: the slot width (Hz)
-        :param roll_off: the roll off of the signal. It is a pure number between 0 and 1
-        :param power (gnpy.core.info.Power): power of signal, ASE noise and NLI (W)
-        :param chromatic_dispersion: chromatic dispersion (s/m)
-        :param pmd: polarization mode dispersion (s)
-        :param pdl: polarization dependent loss (dB)
+class Channel(
+    namedtuple('Channel',
+               'channel_number frequency baud_rate slot_width roll_off power chromatic_dispersion pmd pdl latency')):
+    """Class containing the parameters of a WDM signal.
+
+    :param channel_number: channel number in the WDM grid
+    :param frequency: central frequency of the signal (Hz)
+    :param baud_rate: the symbol rate of the signal (Baud)
+    :param slot_width: the slot width (Hz)
+    :param roll_off: the roll off of the signal. It is a pure number between 0 and 1
+    :param power (gnpy.core.info.Power): power of signal, ASE noise and NLI (W)
+    :param chromatic_dispersion: chromatic dispersion (s/m)
+    :param pmd: polarization mode dispersion (s)
+    :param pdl: polarization dependent loss (dB)
+    :param latency: propagation latency (s)
    """


-class Pref(namedtuple('Pref', 'p_span0, p_spani, neq_ch ')):
+class Pref(namedtuple('Pref', 'p_span0, p_spani, ref_carrier')):
    """noiseless reference power in dBm:
-    p_span0: inital target carrier power
-    p_spani: carrier power after element i
-    neq_ch: equivalent channel count in dB"""
+
+    p_span0: inital target carrier power for a reference channel defined by user
+    p_spani: carrier power after element i for a reference channel defined by user
+    ref_carrier records the baud rate of the reference channel
+    """


 class SpectralInformation(object):
-    """ Class containing the parameters of the entire WDM comb."""
+    """Class containing the parameters of the entire WDM comb.
+
+    delta_pdb_per_channel: (per frequency) per channel delta power in dbm for the actual mix of channels"""

    def __init__(self, frequency: array, baud_rate: array, slot_width: array, signal: array, nli: array, ase: array,
-                 roll_off: array, chromatic_dispersion: array, pmd: array, pdl: array):
+                 roll_off: array, chromatic_dispersion: array, pmd: array, pdl: array, latency: array,
+                 delta_pdb_per_channel: array, tx_osnr: array, ref_power: Pref, label: array):
        indices = argsort(frequency)
        self._frequency = frequency[indices]
        self._df = outer(ones(frequency.shape), frequency) - outer(frequency, ones(frequency.shape))
@@ -77,8 +86,11 @@ class SpectralInformation(object):
        self._chromatic_dispersion = chromatic_dispersion[indices]
        self._pmd = pmd[indices]
        self._pdl = pdl[indices]
-        pref = lin2db(mean(signal) * 1e3)
-        self._pref = Pref(pref, pref, lin2db(self._number_of_channels))
+        self._latency = latency[indices]
+        self._delta_pdb_per_channel = delta_pdb_per_channel[indices]
+        self._tx_osnr = tx_osnr[indices]
+        self._pref = ref_power
+        self._label = label[indices]

    @property
    def pref(self):
@@ -155,6 +167,10 @@ class SpectralInformation(object):
    def pmd(self):
        return self._pmd

+    @property
+    def label(self):
+        return self._label
+
    @pmd.setter
    def pmd(self, pmd):
        self._pmd = pmd
@@ -167,6 +183,30 @@ class SpectralInformation(object):
    def pdl(self, pdl):
        self._pdl = pdl

+    @property
+    def latency(self):
+        return self._latency
+
+    @latency.setter
+    def latency(self, latency):
+        self._latency = latency
+
+    @property
+    def delta_pdb_per_channel(self):
+        return self._delta_pdb_per_channel
+
+    @delta_pdb_per_channel.setter
+    def delta_pdb_per_channel(self, delta_pdb_per_channel):
+        self._delta_pdb_per_channel = delta_pdb_per_channel
+
+    @property
+    def tx_osnr(self):
+        return self._tx_osnr
+
+    @tx_osnr.setter
+    def tx_osnr(self, tx_osnr):
+        self._tx_osnr = tx_osnr
+
    @property
    def channel_number(self):
        return self._channel_number
@@ -174,7 +214,7 @@ class SpectralInformation(object):
    @property
    def carriers(self):
        entries = zip(self.channel_number, self.frequency, self.baud_rate, self.slot_width,
-                      self.roll_off, self.powers, self.chromatic_dispersion, self.pmd, self.pdl)
+                      self.roll_off, self.powers, self.chromatic_dispersion, self.pmd, self.pdl, self.latency)
        return [Channel(*entry) for entry in entries]

    def apply_attenuation_lin(self, attenuation_lin):
@@ -197,6 +237,12 @@ class SpectralInformation(object):

    def __add__(self, other: SpectralInformation):
        try:
+            # Note that pref.p_spanx from "self" and "other" must be identical for a given simulation (correspond to the
+            # the simulation setup):
+            # - for a given simulation there is only one design (one p_span0),
+            # - and p_spani is the propagation result of p_span0 so there should not be different p_spani either.
+            if (self.pref.p_span0 != other.pref.p_span0) or (self.pref.p_spani != other.pref.p_spani):
+                raise SpectrumError('reference powers of the spectrum are not identical')
            return SpectralInformation(frequency=append(self.frequency, other.frequency),
                                       slot_width=append(self.slot_width, other.slot_width),
                                       signal=append(self.signal, other.signal), nli=append(self.nli, other.nli),
@@ -206,14 +252,22 @@ class SpectralInformation(object):
                                       chromatic_dispersion=append(self.chromatic_dispersion,
                                                                   other.chromatic_dispersion),
                                       pmd=append(self.pmd, other.pmd),
-                                       pdl=append(self.pdl, other.pdl))
+                                       pdl=append(self.pdl, other.pdl),
+                                       latency=append(self.latency, other.latency),
+                                       delta_pdb_per_channel=append(self.delta_pdb_per_channel,
+                                                                    other.delta_pdb_per_channel),
+                                       tx_osnr=append(self.tx_osnr, other.tx_osnr),
+                                       ref_power=Pref(self.pref.p_span0, self.pref.p_spani, self.pref.ref_carrier),
+                                       label=append(self.label, other.label))
        except SpectrumError:
            raise SpectrumError('Spectra cannot be summed: channels overlapping.')

+
    def _replace(self, carriers, pref):
        self.chromatic_dispersion = array([c.chromatic_dispersion for c in carriers])
        self.pmd = array([c.pmd for c in carriers])
        self.pdl = array([c.pdl for c in carriers])
+        self.latency = array([c.latency for c in carriers])
        self.signal = array([c.power.signal for c in carriers])
        self.nli = array([c.power.nli for c in carriers])
        self.ase = array([c.power.ase for c in carriers])
@@ -221,14 +275,19 @@ class SpectralInformation(object):
        return self


-def create_arbitrary_spectral_information(frequency: Union[ndarray, Iterable, int, float],
-                                          signal: Union[int, float, ndarray, Iterable],
-                                          baud_rate: Union[int, float, ndarray, Iterable],
-                                          slot_width: Union[int, float, ndarray, Iterable] = None,
-                                          roll_off: Union[int, float, ndarray, Iterable] = 0.,
-                                          chromatic_dispersion: Union[int, float, ndarray, Iterable] = 0.,
-                                          pmd: Union[int, float, ndarray, Iterable] = 0.,
-                                          pdl: Union[int, float, ndarray, Iterable] = 0.):
+def create_arbitrary_spectral_information(frequency: Union[ndarray, Iterable, float],
+                                          signal: Union[float, ndarray, Iterable],
+                                          baud_rate: Union[float, ndarray, Iterable],
+                                          tx_osnr: Union[float, ndarray, Iterable],
+                                          delta_pdb_per_channel: Union[float, ndarray, Iterable] = 0.,
+                                          slot_width: Union[float, ndarray, Iterable] = None,
+                                          roll_off: Union[float, ndarray, Iterable] = 0.,
+                                          chromatic_dispersion: Union[float, ndarray, Iterable] = 0.,
+                                          pmd: Union[float, ndarray, Iterable] = 0.,
+                                          pdl: Union[float, ndarray, Iterable] = 0.,
+                                          latency: Union[float, ndarray, Iterable] = 0.,
+                                          ref_power: Pref = None,
+                                          label: Union[str, ndarray, Iterable] = None):
    """This is just a wrapper around the SpectralInformation.__init__() that simplifies the creation of
    a non-uniform spectral information with NLI and ASE powers set to zero."""
    frequency = asarray(frequency)
@@ -242,13 +301,20 @@ def create_arbitrary_spectral_information(frequency: Union[ndarray, Iterable, in
        chromatic_dispersion = full(number_of_channels, chromatic_dispersion)
        pmd = full(number_of_channels, pmd)
        pdl = full(number_of_channels, pdl)
+        latency = full(number_of_channels, latency)
        nli = zeros(number_of_channels)
        ase = zeros(number_of_channels)
+        delta_pdb_per_channel = full(number_of_channels, delta_pdb_per_channel)
+        tx_osnr = full(number_of_channels, tx_osnr)
+        label = full(number_of_channels, label)
        return SpectralInformation(frequency=frequency, slot_width=slot_width,
                                   signal=signal, nli=nli, ase=ase,
                                   baud_rate=baud_rate, roll_off=roll_off,
                                   chromatic_dispersion=chromatic_dispersion,
-                                   pmd=pmd, pdl=pdl)
+                                   pmd=pmd, pdl=pdl, latency=latency,
+                                   delta_pdb_per_channel=delta_pdb_per_channel,
+                                   tx_osnr=tx_osnr,
+                                   ref_power=ref_power, label=label)
    except ValueError as e:
        if 'could not broadcast' in str(e):
            raise SpectrumError('Dimension mismatch in input fields.')
@@ -256,9 +322,83 @@ def create_arbitrary_spectral_information(frequency: Union[ndarray, Iterable, in
            raise


-def create_input_spectral_information(f_min, f_max, roll_off, baud_rate, power, spacing):
-    """ Creates a fixed slot width spectral information with flat power """
-    nb_channel = automatic_nch(f_min, f_max, spacing)
-    frequency = [(f_min + spacing * i) for i in range(1, nb_channel + 1)]
+def create_input_spectral_information(f_min, f_max, roll_off, baud_rate, power, spacing, tx_osnr, delta_pdb=0,
+                                      ref_carrier=None):
+    """Creates a fixed slot width spectral information with flat power.
+    all arguments are scalar values"""
+    number_of_channels = automatic_nch(f_min, f_max, spacing)
+    frequency = [(f_min + spacing * i) for i in range(1, number_of_channels + 1)]
+    p_span0 = watt2dbm(power)
+    p_spani = watt2dbm(power)
+    delta_pdb_per_channel = delta_pdb * ones(number_of_channels)
+    label = [f'{baud_rate * 1e-9 :.2f}G' for i in range(number_of_channels)]
    return create_arbitrary_spectral_information(frequency, slot_width=spacing, signal=power, baud_rate=baud_rate,
-                                                 roll_off=roll_off)
+                                                 roll_off=roll_off, delta_pdb_per_channel=delta_pdb_per_channel,
+                                                 tx_osnr=tx_osnr,
+                                                 ref_power=Pref(p_span0=p_span0, p_spani=p_spani,
+                                                                ref_carrier=ref_carrier),
+                                                 label=label)
+
+
+def carriers_to_spectral_information(initial_spectrum: dict[float, Carrier], power: float,
+                                     ref_carrier: ReferenceCarrier) -> SpectralInformation:
+    """Initial spectrum is a dict with key = carrier frequency, and value a Carrier object.
+    :param initial_spectrum: indexed by frequency in Hz, with power offset (delta_pdb), baudrate, slot width,
+    tx_osnr and roll off.
+    :param power: power of the request
+    :param ref_carrier: reference carrier (baudrate) used for the reference channel
+    """
+    frequency = list(initial_spectrum.keys())
+    signal = [power * db2lin(c.delta_pdb) for c in initial_spectrum.values()]
+    roll_off = [c.roll_off for c in initial_spectrum.values()]
+    baud_rate = [c.baud_rate for c in initial_spectrum.values()]
+    delta_pdb_per_channel = [c.delta_pdb for c in initial_spectrum.values()]
+    slot_width = [c.slot_width for c in initial_spectrum.values()]
+    tx_osnr = [c.tx_osnr for c in initial_spectrum.values()]
+    label = [c.label for c in initial_spectrum.values()]
+    p_span0 = watt2dbm(power)
+    p_spani = watt2dbm(power)
+    return create_arbitrary_spectral_information(frequency=frequency, signal=signal, baud_rate=baud_rate,
+                                                 slot_width=slot_width, roll_off=roll_off,
+                                                 delta_pdb_per_channel=delta_pdb_per_channel, tx_osnr=tx_osnr,
+                                                 ref_power=Pref(p_span0=p_span0, p_spani=p_spani,
+                                                                ref_carrier=ref_carrier),
+                                                 label=label)
+
+
+@dataclass
+class Carrier:
+    """One channel in the initial mixed-type spectrum definition, each type being defined by
+    its delta_pdb (power offset with respect to reference power), baud rate, slot_width, roll_off
+    and tx_osnr. delta_pdb offset is applied to target power out of Roadm.
+    Label is used to group carriers which belong to the same partition when printing results.
+    """
+    delta_pdb: float
+    baud_rate: float
+    slot_width: float
+    roll_off: float
+    tx_osnr: float
+    label: str
+
+
+@dataclass
+class ReferenceCarrier:
+    """Reference channel type is used to determine target power out of ROADM for the reference channel when
+    constant power spectral density (PSD) equalization is set. Reference channel is the type that has been defined
+    in SI block and used for the initial design of the network.
+    Computing the power out of ROADM for the reference channel is required to correctly compute the loss
+    experienced by p_span_i in Roadm element.
+
+    Baud rate is required to find the target power in constant PSD: power = PSD_target * baud_rate.
+    For example, if target PSD is 3.125e4mW/GHz and reference carrier type a 32 GBaud channel then
+    output power should be -20 dBm and for a 64 GBaud channel power target would need 3 dB more: -17 dBm.
+
+    Slot width is required to find the target power in constant PSW (constant power per slot width equalization):
+    power = PSW_target * slot_width.
+    For example, if target PSW is 2e4mW/GHz and reference carrier type a 32 GBaud channel in a 50GHz slot width then
+    output power should be -20 dBm and for a 64 GBaud channel  in a 75 GHz slot width, power target would be -18.24 dBm.
+
+    Other attributes (like slot_width or roll-off) may be added there for future equalization purpose.
+    """
+    baud_rate: float
+    slot_width: float
--- a/gnpy/core/network.py
+++ b/gnpy/core/network.py
@@ -1,18 +1,25 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

-'''
+"""
 gnpy.core.network
 =================

 Working with networks which consist of network elements
-'''
+"""

 from operator import attrgetter
-from gnpy.core import ansi_escapes, elements
+from collections import namedtuple
+from logging import getLogger
+
+from gnpy.core import elements
 from gnpy.core.exceptions import ConfigurationError, NetworkTopologyError
 from gnpy.core.utils import round2float, convert_length
-from collections import namedtuple
+from gnpy.core.info import ReferenceCarrier
+from gnpy.tools.json_io import Amp
+
+
+logger = getLogger(__name__)


 def edfa_nf(gain_target, variety_type, equipment):
@@ -103,10 +110,9 @@ def select_edfa(raman_allowed, gain_target, power_target, equipment, uid, restri
                    please increase span fiber padding')
        else:
            # TODO: convert to logging
-            print(
-                f'{ansi_escapes.red}WARNING:{ansi_escapes.reset} target gain in node {uid} is below all available amplifiers min gain: \
-                  amplifier input padding will be assumed, consider increase span fiber padding instead'
-            )
+            logger.warning(f'\n\tWARNING: target gain in node {uid} is below all available amplifiers min gain: '
+                           + '\n\tamplifier input padding will be assumed, consider increase span fiber padding '
+                           + 'instead.\n')
            acceptable_gain_min_list = edfa_list

    # filter on gain+power limitation:
@@ -128,12 +134,9 @@ def select_edfa(raman_allowed, gain_target, power_target, equipment, uid, restri
    # check what are the gain and power limitations of this amp
    power_reduction = round(min(selected_edfa.power, 0), 2)
    if power_reduction < -0.5:
-        print(
-            f'{ansi_escapes.red}WARNING:{ansi_escapes.reset} target gain and power in node {uid}\n \
-    is beyond all available amplifiers capabilities and/or extended_gain_range:\n\
-    a power reduction of {power_reduction} is applied\n'
-        )
-
+        logger.warning(f'\n\tWARNING: target gain and power in node {uid}\n'
+                       + '\tis beyond all available amplifiers capabilities and/or extended_gain_range:\n'
+                       + f'\ta power reduction of {power_reduction} is applied\n')
    return selected_edfa.variety, power_reduction


@@ -234,25 +237,22 @@ def set_amplifier_voa(amp, power_target, power_mode):


 def set_egress_amplifier(network, this_node, equipment, pref_ch_db, pref_total_db):
-    """ this node can be a transceiver or a ROADM (same function called in both cases)
-    """
+    """this node can be a transceiver or a ROADM (same function called in both cases)"""
    power_mode = equipment['Span']['default'].power_mode
+    ref_carrier = ReferenceCarrier(baud_rate=equipment['SI']['default'].baud_rate,
+                                   slot_width=equipment['SI']['default'].spacing)
    next_oms = (n for n in network.successors(this_node) if not isinstance(n, elements.Transceiver))
-    this_node_degree = getattr(this_node, 'per_degree_pch_out_dbm', {})
    for oms in next_oms:
        # go through all the OMS departing from the ROADM
        prev_node = this_node
        node = oms
-        # if isinstance(next_node, elements.Fused): #support ROADM wo egress amp for metro applications
-        #     node = find_last_node(next_node)
-        #     next_node = next(n for n in network.successors(node))
-        #     next_node = find_last_node(next_node)
-        if node.uid not in this_node_degree:
-            # if no target power is defined on this degree or no per degree target power is given use the global one
-            # if target_pch_out_db  is not an attribute, then the element must be a transceiver
-            this_node_degree[node.uid] = getattr(this_node.params, 'target_pch_out_db', 0)
+        if isinstance(this_node, elements.Transceiver):
+            this_node_out_power = 0.0     # default value if this_node is a transceiver
+        if isinstance(this_node, elements.Roadm):
+            # get target power out from ROADM for the reference carrier based on equalization settings
+            this_node_out_power = this_node.get_per_degree_ref_power(degree=node.uid, ref_carrier=ref_carrier)
        # use the target power on this degree
-        prev_dp = this_node_degree[node.uid] - pref_ch_db
+        prev_dp = this_node_out_power - pref_ch_db
        dp = prev_dp
        prev_voa = 0
        voa = 0
@@ -284,7 +284,7 @@ def set_egress_amplifier(network, this_node, equipment, pref_ch_db, pref_total_d
                if isinstance(prev_node, elements.Fiber):
                    max_fiber_lineic_loss_for_raman = \
                        equipment['Span']['default'].max_fiber_lineic_loss_for_raman * 1e-3  # dB/m
-                    raman_allowed = prev_node.params.loss_coef < max_fiber_lineic_loss_for_raman
+                    raman_allowed = (prev_node.params.loss_coef < max_fiber_lineic_loss_for_raman).all()
                else:
                    raman_allowed = False

@@ -307,21 +307,21 @@ def set_egress_amplifier(network, this_node, equipment, pref_ch_db, pref_total_d
                else:
                    if node.params.raman and not raman_allowed:
                        if isinstance(prev_node, elements.Fiber):
-                            print(f'{ansi_escapes.red}WARNING{ansi_escapes.reset}: raman is used in node {node.uid}\n '
-                                  'but fiber lineic loss is above threshold\n')
+                            logger.warning(f'\n\tWARNING: raman is used in node {node.uid}\n '
+                                           + '\tbut fiber lineic loss is above threshold\n')
                        else:
-                            print(f'{ansi_escapes.red}WARNING{ansi_escapes.reset}: raman is used in node {node.uid}\n '
-                                  'but previous node is not a fiber\n')
+                            logger.critical(f'\n\tWARNING: raman is used in node {node.uid}\n '
+                                            + '\tbut previous node is not a fiber\n')
                    # if variety is imposed by user, and if the gain_target (computed or imposed) is also above
                    # variety max gain + extended range, then warn that gain > max_gain + extended range
                    if gain_target - equipment['Edfa'][node.params.type_variety].gain_flatmax - \
                            equipment['Span']['default'].target_extended_gain > 1e-2:
                        # 1e-2 to allow a small margin according to round2float min step
-                        print(f'{ansi_escapes.red}WARNING{ansi_escapes.reset}: '
-                              f'WARNING: effective gain in Node {node.uid} is above user '
-                              f'specified amplifier {node.params.type_variety}\n'
-                              f'max flat gain: {equipment["Edfa"][node.params.type_variety].gain_flatmax}dB ; '
-                              f'required gain: {gain_target}dB. Please check amplifier type.')
+                        logger.warning(f'\n\tWARNING: effective gain in Node {node.uid}\n'
+                                       + f'\tis above user specified amplifier {node.params.type_variety}\n'
+                                       + '\tmax flat gain: '
+                                       + f'{equipment["Edfa"][node.params.type_variety].gain_flatmax}dB ; '
+                                       + f'required gain: {gain_target}dB. Please check amplifier type.\n')

                node.delta_p = dp if power_mode else None
                node.effective_gain = gain_target
@@ -331,10 +331,28 @@ def set_egress_amplifier(network, this_node, equipment, pref_ch_db, pref_total_d
            prev_voa = voa
            prev_node = node
            node = next_node
-            # print(f'{node.uid}')

-    if isinstance(this_node, elements.Roadm):
-        this_node.per_degree_pch_out_dbm = {k: v for k, v in this_node_degree.items()}
+
+def set_roadm_per_degree_targets(roadm, network):
+    """Set target powers/PSD on all degrees
+    This is needed to populate per_degree_pch_out_dbm or per_degree_pch_psd or per_degree_pch_psw dicts when
+    they are not initialized by users.
+    """
+    next_oms = (n for n in network.successors(roadm) if not isinstance(n, elements.Transceiver))
+
+    for node in next_oms:
+        # go through all the OMS departing from the ROADM
+        if node.uid not in roadm.per_degree_pch_out_dbm and node.uid not in roadm.per_degree_pch_psd and \
+                node.uid not in roadm.per_degree_pch_psw:
+            # if no target power is defined on this degree or no per degree target power is given use the global one
+            if roadm.params.target_pch_out_db:
+                roadm.per_degree_pch_out_dbm[node.uid] = roadm.params.target_pch_out_db
+            elif roadm.params.target_psd_out_mWperGHz:
+                roadm.per_degree_pch_psd[node.uid] = roadm.params.target_psd_out_mWperGHz
+            elif roadm.params.target_out_mWperSlotWidth:
+                roadm.per_degree_pch_psw[node.uid] = roadm.params.target_out_mWperSlotWidth
+            else:
+                raise ConfigurationError(roadm.uid, 'needs an equalization target')


 def add_roadm_booster(network, roadm):
@@ -345,7 +363,7 @@ def add_roadm_booster(network, roadm):
        network.remove_edge(roadm, next_node)
        amp = elements.Edfa(
            uid=f'Edfa_booster_{roadm.uid}_to_{next_node.uid}',
-            params={},
+            params=Amp.default_values,
            metadata={
                'location': {
                    'latitude': roadm.lat,
@@ -371,7 +389,7 @@ def add_roadm_preamp(network, roadm):
        network.remove_edge(prev_node, roadm)
        amp = elements.Edfa(
            uid=f'Edfa_preamp_{roadm.uid}_from_{prev_node.uid}',
-            params={},
+            params=Amp.default_values,
            metadata={
                'location': {
                    'latitude': roadm.lat,
@@ -400,7 +418,7 @@ def add_inline_amplifier(network, fiber):
        network.remove_edge(fiber, next_node)
        amp = elements.Edfa(
            uid=f'Edfa_{fiber.uid}',
-            params={},
+            params=Amp.default_values,
            metadata={
                'location': {
                    'latitude': (fiber.lat + next_node.lat) / 2,
@@ -432,10 +450,10 @@ def calculate_new_length(fiber_length, bounds, target_length):
        return (length1, n_spans1)
    elif (bounds.start <= length2 <= bounds.stop) and not(bounds.start <= length1 <= bounds.stop):
        return (length2, n_spans2)
-    elif target_length - length1 < length2 - target_length:
-        return (length1, n_spans1)
-    else:
+    elif length2 - target_length <= target_length - length1 and length2 <= bounds.stop:
        return (length2, n_spans2)
+    else:
+        return (length1, n_spans1)


 def split_fiber(network, fiber, bounds, target_length, equipment):
@@ -547,6 +565,7 @@ def build_network(network, equipment, pref_ch_db, pref_total_db, no_insert_edfas
    add_fiber_padding(network, fibers, default_span_data.padding)

    for roadm in roadms:
+        set_roadm_per_degree_targets(roadm, network)
        set_egress_amplifier(network, roadm, equipment, pref_ch_db, pref_total_db)

    trx = [t for t in network.nodes() if isinstance(t, elements.Transceiver)]
--- a/gnpy/core/parameters.py
+++ b/gnpy/core/parameters.py
@@ -7,9 +7,10 @@ gnpy.core.parameters

 This module contains all parameters to configure standard network elements.
 """
+from collections import namedtuple

 from scipy.constants import c, pi
-from numpy import asarray, array
+from numpy import asarray, array, exp, sqrt, log, outer, ones, squeeze, append, flip, linspace, full

 from gnpy.core.utils import convert_length
 from gnpy.core.exceptions import ParametersError
@@ -35,7 +36,8 @@ class PumpParams(Parameters):

 class RamanParams(Parameters):
    def __init__(self, flag=False, result_spatial_resolution=10e3, solver_spatial_resolution=50):
-        """ Simulation parameters used within the Raman Solver
+        """Simulation parameters used within the Raman Solver
+
        :params flag: boolean for enabling/disable the evaluation of the Raman power profile in frequency and position
        :params result_spatial_resolution: spatial resolution of the evaluated Raman power profile
        :params solver_spatial_resolution: spatial step for the iterative solution of the first order ode
@@ -48,7 +50,8 @@ class RamanParams(Parameters):
 class NLIParams(Parameters):
    def __init__(self, method='gn_model_analytic', dispersion_tolerance=1, phase_shift_tolerance=0.1,
                 computed_channels=None):
-        """ Simulation parameters used within the Nli Solver
+        """Simulation parameters used within the Nli Solver
+
        :params method: formula for NLI calculation
        :params dispersion_tolerance: tuning parameter for ggn model solution
        :params phase_shift_tolerance: tuning parameter for ggn model solution
@@ -63,20 +66,11 @@ class NLIParams(Parameters):
 class SimParams(Parameters):
    _shared_dict = {'nli_params': NLIParams(), 'raman_params': RamanParams()}

-    def __init__(self):
-        if type(self) == SimParams:
-            raise NotImplementedError('Instances of SimParams cannot be generated')
-
    @classmethod
    def set_params(cls, sim_params):
        cls._shared_dict['nli_params'] = NLIParams(**sim_params.get('nli_params', {}))
        cls._shared_dict['raman_params'] = RamanParams(**sim_params.get('raman_params', {}))

-    @classmethod
-    def get(cls):
-        self = cls.__new__(cls)
-        return self
-
    @property
    def nli_params(self):
        return self._shared_dict['nli_params']
@@ -88,13 +82,22 @@ class SimParams(Parameters):

 class RoadmParams(Parameters):
    def __init__(self, **kwargs):
+        self.target_pch_out_db = kwargs.get('target_pch_out_db')
+        self.target_psd_out_mWperGHz = kwargs.get('target_psd_out_mWperGHz')
+        self.target_out_mWperSlotWidth = kwargs.get('target_out_mWperSlotWidth')
+        equalisation_type = ['target_pch_out_db', 'target_psd_out_mWperGHz', 'target_out_mWperSlotWidth']
+        temp = [kwargs.get(k) is not None for k in equalisation_type]
+        if sum(temp) > 1:
+            raise ParametersError('ROADM config contains more than one equalisation type.'
+                                  + 'Please choose only one', kwargs)
+        self.per_degree_pch_out_db = kwargs.get('per_degree_pch_out_db', {})
+        self.per_degree_pch_psd = kwargs.get('per_degree_psd_out_mWperGHz', {})
+        self.per_degree_pch_psw = kwargs.get('per_degree_psd_out_mWperSlotWidth', {})
        try:
-            self.target_pch_out_db = kwargs['target_pch_out_db']
            self.add_drop_osnr = kwargs['add_drop_osnr']
            self.pmd = kwargs['pmd']
            self.pdl = kwargs['pdl']
            self.restrictions = kwargs['restrictions']
-            self.per_degree_pch_out_db = kwargs['per_degree_pch_out_db'] if 'per_degree_pch_out_db' in kwargs else {}
        except KeyError as e:
            raise ParametersError(f'ROADM configurations must include {e}. Configuration: {kwargs}')

@@ -104,26 +107,50 @@ class FusedParams(Parameters):
        self.loss = kwargs['loss'] if 'loss' in kwargs else 1


-# SSMF Raman coefficient profile normalized with respect to the effective area (Cr * A_eff)
-CR_NORM = array([
-    0., 7.802e-16, 2.4236e-15, 4.0504e-15, 5.6606e-15, 6.8973e-15, 7.802e-15, 8.4162e-15, 8.8727e-15, 9.2877e-15,
-    1.01011e-14, 1.05244e-14, 1.13295e-14, 1.2367e-14, 1.3695e-14, 1.5023e-14, 1.64091e-14, 1.81936e-14, 2.04927e-14,
-    2.28167e-14, 2.48917e-14, 2.66098e-14, 2.82615e-14, 2.98136e-14, 3.1042e-14, 3.17558e-14, 3.18803e-14, 3.17558e-14,
-    3.15566e-14, 3.11748e-14, 2.94567e-14, 3.14985e-14, 2.8552e-14, 2.43439e-14, 1.67992e-14, 9.6114e-15, 7.02180e-15,
-    5.9262e-15, 5.6938e-15, 7.055e-15, 7.4119e-15, 7.4783e-15, 6.7645e-15, 5.5361e-15, 3.6271e-15, 2.7224e-15,
-    2.4568e-15, 2.1995e-15, 2.1331e-15, 2.3323e-15, 2.5564e-15, 3.0461e-15, 4.8555e-15, 5.5029e-15, 5.2788e-15,
-    4.565e-15, 3.3698e-15, 2.2991e-15, 2.0086e-15, 1.5521e-15, 1.328e-15, 1.162e-15, 9.379e-16, 8.715e-16, 8.134e-16,
-    8.134e-16, 9.379e-16, 1.3612e-15, 1.6185e-15, 1.9754e-15, 1.8758e-15, 1.6849e-15, 1.2284e-15, 9.047e-16, 8.134e-16,
-    8.715e-16, 9.711e-16, 1.0375e-15, 1.0043e-15, 9.047e-16, 8.134e-16, 6.806e-16, 5.478e-16, 3.901e-16, 2.241e-16,
-    1.577e-16, 9.96e-17, 3.32e-17, 1.66e-17, 8.3e-18])
+DEFAULT_RAMAN_COEFFICIENT = {
+    # SSMF Raman coefficient profile normalized with respect to the effective area overlap (g0 * A_eff(f_probe, f_pump))
+    'g0': array(
+        [0.00000000e+00, 1.12351610e-05, 3.47838074e-05, 5.79356636e-05, 8.06921680e-05, 9.79845709e-05, 1.10454361e-04,
+         1.18735302e-04, 1.24736889e-04, 1.30110053e-04, 1.41001273e-04, 1.46383247e-04, 1.57011792e-04, 1.70765865e-04,
+         1.88408911e-04, 2.05914127e-04, 2.24074028e-04, 2.47508283e-04, 2.77729174e-04, 3.08044243e-04, 3.34764439e-04,
+         3.56481704e-04, 3.77127256e-04, 3.96269124e-04, 4.10955175e-04, 4.18718761e-04, 4.19511263e-04, 4.17025384e-04,
+         4.13565369e-04, 4.07726048e-04, 3.83671291e-04, 4.08564283e-04, 3.69571936e-04, 3.14442090e-04, 2.16074535e-04,
+         1.23097823e-04, 8.95457457e-05, 7.52470400e-05, 7.19806145e-05, 8.87961158e-05, 9.30812065e-05, 9.37058268e-05,
+         8.45719619e-05, 6.90585286e-05, 4.50407159e-05, 3.36521245e-05, 3.02292475e-05, 2.69376939e-05, 2.60020897e-05,
+         2.82958958e-05, 3.08667558e-05, 3.66024657e-05, 5.80610307e-05, 6.54797937e-05, 6.25022715e-05, 5.37806442e-05,
+         3.94996621e-05, 2.68120644e-05, 2.33038554e-05, 1.79140757e-05, 1.52472424e-05, 1.32707565e-05, 1.06541760e-05,
+         9.84649374e-06, 9.13999627e-06, 9.08971012e-06, 1.04227525e-05, 1.50419271e-05, 1.77838232e-05, 2.15810815e-05,
+         2.03744008e-05, 1.81939341e-05, 1.31862121e-05, 9.65352116e-06, 8.62698322e-06, 9.18688016e-06, 1.01737784e-05,
+         1.08017817e-05, 1.03903588e-05, 9.30040333e-06, 8.30809173e-06, 6.90650401e-06, 5.52238029e-06, 3.90648708e-06,
+         2.22908227e-06, 1.55796177e-06, 9.77218716e-07, 3.23477236e-07, 1.60602454e-07, 7.97306386e-08]
+    ),  # [m/W]

-# Note the non-uniform spacing of this range; this is required for properly capturing the Raman peak shape.
-FREQ_OFFSET = array([
-    0., 0.5, 1., 1.5, 2., 2.5, 3., 3.5, 4., 4.5, 5., 5.5, 6., 6.5, 7., 7.5, 8., 8.5, 9., 9.5, 10., 10.5, 11., 11.5, 12.,
-    12.5, 12.75, 13., 13.25, 13.5, 14., 14.5, 14.75, 15., 15.5, 16., 16.5, 17., 17.5, 18., 18.25, 18.5, 18.75, 19.,
-    19.5, 20., 20.5, 21., 21.5, 22., 22.5, 23., 23.5, 24., 24.5, 25., 25.5, 26., 26.5, 27., 27.5, 28., 28.5, 29., 29.5,
-    30., 30.5, 31., 31.5, 32., 32.5, 33., 33.5, 34., 34.5, 35., 35.5, 36., 36.5, 37., 37.5, 38., 38.5, 39., 39.5, 40.,
-    40.5, 41., 41.5, 42.]) * 1e12
+    # Note the non-uniform spacing of this range; this is required for properly capturing the Raman peak shape.
+    'frequency_offset': array([
+        0., 0.5, 1., 1.5, 2., 2.5, 3., 3.5, 4., 4.5, 5., 5.5, 6., 6.5, 7., 7.5, 8., 8.5, 9., 9.5, 10., 10.5, 11., 11.5,
+        12.,
+        12.5, 12.75, 13., 13.25, 13.5, 14., 14.5, 14.75, 15., 15.5, 16., 16.5, 17., 17.5, 18., 18.25, 18.5, 18.75, 19.,
+        19.5, 20., 20.5, 21., 21.5, 22., 22.5, 23., 23.5, 24., 24.5, 25., 25.5, 26., 26.5, 27., 27.5, 28., 28.5, 29.,
+        29.5,
+        30., 30.5, 31., 31.5, 32., 32.5, 33., 33.5, 34., 34.5, 35., 35.5, 36., 36.5, 37., 37.5, 38., 38.5, 39., 39.5,
+        40.,
+        40.5, 41., 41.5, 42.]
+    ) * 1e12,  # [Hz]
+
+    # Raman profile reference frequency
+    'reference_frequency': 206184634112792  # [Hz] (1454 nm)}
+}
+
+
+class RamanGainCoefficient(namedtuple('RamanGainCoefficient', 'normalized_gamma_raman frequency_offset')):
+    """ Raman Gain Coefficient Parameters
+
+        Based on:
+            Andrea D’Amico, Bruno Correia, Elliot London, Emanuele Virgillito, Giacomo Borraccini, Antonio Napoli,
+            and Vittorio Curri, "Scalable and Disaggregated GGN Approximation Applied to a C+L+S Optical Network,"
+            J. Lightwave Technol. 40, 3499-3511 (2022)
+            Section III.D
+    """


 class FiberParams(Parameters):
@@ -137,6 +164,8 @@ class FiberParams(Parameters):
            # with default values from eqpt_config.json[Spans]
            self._con_in = kwargs.get('con_in')
            self._con_out = kwargs.get('con_out')
+
+            # Reference frequency (unique for all parameters: beta2, beta3, gamma, effective_area)
            if 'ref_wavelength' in kwargs:
                self._ref_wavelength = kwargs['ref_wavelength']
                self._ref_frequency = c / self._ref_wavelength
@@ -146,35 +175,70 @@ class FiberParams(Parameters):
            else:
                self._ref_wavelength = 1550e-9  # conventional central C band wavelength [m]
                self._ref_frequency = c / self._ref_wavelength
-            self._dispersion = kwargs['dispersion']  # s/m/m
-            self._dispersion_slope = \
-                kwargs.get('dispersion_slope', -2 * self._dispersion / self.ref_wavelength)  # s/m/m/m
-            self._beta2 = -(self.ref_wavelength ** 2) * self.dispersion / (2 * pi * c)  # 1/(m * Hz^2)
-            # Eq. (3.23) in  Abramczyk, Halina. "Dispersion phenomena in optical fibers." Virtual European University
-            # on Lasers. Available online: http://mitr.p.lodz.pl/evu/lectures/Abramczyk3.pdf
-            # (accessed on 25 March 2018) (2005).
-            self._beta3 = ((self.dispersion_slope - (4*pi*c/self.ref_wavelength**3) * self.beta2) /
-                           (2*pi*c/self.ref_wavelength**2)**2)
+
+            # Chromatic Dispersion
+            if 'dispersion_per_frequency' in kwargs:
+                # Frequency-dependent dispersion
+                self._dispersion = asarray(kwargs['dispersion']['value'])  # s/m/m
+                self._f_dispersion_ref = asarray(kwargs['dispersion']['frequency'])  # Hz
+                self._dispersion_slope = None
+            elif 'dispersion' in kwargs:
+                # Single value dispersion
+                self._dispersion = asarray(kwargs['dispersion'])  # s/m/m
+                self._dispersion_slope = kwargs.get('dispersion_slope')  # s/m/m/m
+                self._f_dispersion_ref = asarray(self._ref_frequency)  # Hz
+            else:
+                # Default single value dispersion
+                self._dispersion = asarray(1.67e-05)  # s/m/m
+                self._dispersion_slope = None
+                self._f_dispersion_ref = asarray(self.ref_frequency)  # Hz
+
+            # Effective Area and Nonlinear Coefficient
            self._effective_area = kwargs.get('effective_area')  # m^2
-            n2 = 2.6e-20  # m^2/W
-            if self._effective_area:
-                self._gamma = kwargs.get('gamma', 2 * pi * n2 / (self.ref_wavelength * self._effective_area))  # 1/W/m
+            self._n1 = 1.468
+            self._core_radius = 4.2e-6  # m
+            self._n2 = 2.6e-20  # m^2/W
+            if self._effective_area is not None:
+                default_gamma = 2 * pi * self._n2 / (self._ref_wavelength * self._effective_area)
+                self._gamma = kwargs.get('gamma', default_gamma)  # 1/W/m
            elif 'gamma' in kwargs:
                self._gamma = kwargs['gamma']  # 1/W/m
-                self._effective_area = 2 * pi * n2 / (self.ref_wavelength * self._gamma)  # m^2
+                self._effective_area = 2 * pi * self._n2 / (self._ref_wavelength * self._gamma)  # m^2
            else:
-                self._gamma = 0  # 1/W/m
                self._effective_area = 83e-12  # m^2
-            default_raman_efficiency = {'cr': CR_NORM / self._effective_area, 'frequency_offset': FREQ_OFFSET}
-            self._raman_efficiency = kwargs.get('raman_efficiency', default_raman_efficiency)
+                self._gamma = 2 * pi * self._n2 / (self._ref_wavelength * self._effective_area)  # 1/W/m
+            self._contrast = 0.5 * (c / (2 * pi * self._ref_frequency * self._core_radius * self._n1) * exp(
+                pi * self._core_radius ** 2 / self._effective_area)) ** 2
+
+            # Raman Gain Coefficient
+            raman_coefficient = kwargs.get('raman_coefficient', DEFAULT_RAMAN_COEFFICIENT)
+            self._g0 = asarray(raman_coefficient['g0'])
+            raman_reference_frequency = raman_coefficient['reference_frequency']
+            frequency_offset = asarray(raman_coefficient['frequency_offset'])
+            stokes_wave = raman_reference_frequency - frequency_offset
+            gamma_raman = self._g0 * self.effective_area_overlap(stokes_wave, raman_reference_frequency)
+            normalized_gamma_raman = gamma_raman / raman_reference_frequency  # 1 / m / W / Hz
+            self._raman_reference_frequency = raman_reference_frequency
+
+            # Raman gain coefficient array of the frequency offset constructed such that positive frequency values
+            # represent a positive power transfer from higher frequency and vice versa
+            frequency_offset = append(-flip(frequency_offset[1:]), frequency_offset)
+            normalized_gamma_raman = append(- flip(normalized_gamma_raman[1:]), normalized_gamma_raman)
+            self._raman_coefficient = RamanGainCoefficient(normalized_gamma_raman, frequency_offset)
+
+            # Polarization Mode Dispersion
            self._pmd_coef = kwargs['pmd_coef']  # s/sqrt(m)
-            if type(kwargs['loss_coef']) == dict:
+
+            # Loss Coefficient
+            if isinstance(kwargs['loss_coef'], dict):
                self._loss_coef = asarray(kwargs['loss_coef']['value']) * 1e-3  # lineic loss dB/m
                self._f_loss_ref = asarray(kwargs['loss_coef']['frequency'])  # Hz
            else:
                self._loss_coef = asarray(kwargs['loss_coef']) * 1e-3  # lineic loss dB/m
                self._f_loss_ref = asarray(self._ref_frequency)  # Hz
-            self._lumped_losses = kwargs['lumped_losses'] if 'lumped_losses' in kwargs else []
+            # Lumped Losses
+            self._lumped_losses = kwargs['lumped_losses'] if 'lumped_losses' in kwargs else array([])
+            self._latency = self._length / (c / self._n1)  # s
        except KeyError as e:
            raise ParametersError(f'Fiber configurations json must include {e}. Configuration: {kwargs}')

@@ -219,6 +283,10 @@ class FiberParams(Parameters):
    def dispersion(self):
        return self._dispersion

+    @property
+    def f_dispersion_ref(self):
+        return self._f_dispersion_ref
+
    @property
    def dispersion_slope(self):
        return self._dispersion_slope
@@ -227,6 +295,20 @@ class FiberParams(Parameters):
    def gamma(self):
        return self._gamma

+    def effective_area_scaling(self, frequency):
+        V = 2 * pi * frequency / c * self._core_radius * self._n1 * sqrt(2 * self._contrast)
+        w = self._core_radius / sqrt(log(V))
+        return asarray(pi * w ** 2)
+
+    def effective_area_overlap(self, frequency_stokes_wave, frequency_pump):
+        effective_area_stokes_wave = self.effective_area_scaling(frequency_stokes_wave)
+        effective_area_pump = self.effective_area_scaling(frequency_pump)
+        return squeeze(outer(effective_area_stokes_wave, ones(effective_area_pump.size)) + outer(
+            ones(effective_area_stokes_wave.size), effective_area_pump)) / 2
+
+    def gamma_scaling(self, frequency):
+        return asarray(2 * pi * self._n2 * frequency / (c * self.effective_area_scaling(frequency)))
+
    @property
    def pmd_coef(self):
        return self._pmd_coef
@@ -239,14 +321,6 @@ class FiberParams(Parameters):
    def ref_frequency(self):
        return self._ref_frequency

-    @property
-    def beta2(self):
-        return self._beta2
-
-    @property
-    def beta3(self):
-        return self._beta3
-
    @property
    def loss_coef(self):
        return self._loss_coef
@@ -256,36 +330,125 @@ class FiberParams(Parameters):
        return self._f_loss_ref

    @property
-    def raman_efficiency(self):
-        return self._raman_efficiency
+    def raman_coefficient(self):
+        return self._raman_coefficient
+
+    @property
+    def latency(self):
+        return self._latency

    def asdict(self):
        dictionary = super().asdict()
        dictionary['loss_coef'] = self.loss_coef * 1e3
        dictionary['length_units'] = 'm'
-        if not self.lumped_losses:
+        if len(self.lumped_losses) == 0:
            dictionary.pop('lumped_losses')
-        if not self.raman_efficiency:
-            dictionary.pop('raman_efficiency')
+        if not self.raman_coefficient:
+            dictionary.pop('raman_coefficient')
+        else:
+            raman_frequency_offset = \
+                self.raman_coefficient.frequency_offset[self.raman_coefficient.frequency_offset >= 0]
+            dictionary['raman_coefficient'] = {'g0': self._g0.tolist(),
+                                               'frequency_offset': raman_frequency_offset.tolist(),
+                                               'reference_frequency': self._raman_reference_frequency}
        return dictionary


 class EdfaParams:
    def __init__(self, **params):
-        self.update_params(params)
-        if params == {}:
-            self.type_variety = ''
-            self.type_def = ''
-            # self.gain_flatmax = 0
-            # self.gain_min = 0
-            # self.p_max = 0
-            # self.nf_model = None
-            # self.nf_fit_coeff = None
-            # self.nf_ripple = None
-            # self.dgt = None
-            # self.gain_ripple = None
-            # self.out_voa_auto = False
-            # self.allowed_for_design = None
+        try:
+            self.type_variety = params['type_variety']
+            self.type_def = params['type_def']
+
+            # Bandwidth
+            self.f_min = params['f_min']
+            self.f_max = params['f_max']
+            self.bandwidth = self.f_max - self.f_min
+            self.f_cent = (self.f_max + self.f_min) / 2
+            self.f_ripple_ref = params['f_ripple_ref']
+
+            # Gain
+            self.gain_flatmax = params['gain_flatmax']
+            self.gain_min = params['gain_min']
+
+            gain_ripple = params['gain_ripple']
+            if gain_ripple == 0:
+                self.gain_ripple = asarray([0, 0])
+                self.f_ripple_ref = asarray([self.f_min, self.f_max])
+            else:
+                self.gain_ripple = asarray(gain_ripple)
+                if self.f_ripple_ref is not None:
+                    if (self.f_ripple_ref[0] != self.f_min) or (self.f_ripple_ref[-1] != self.f_max):
+                        raise ParametersError("The reference ripple frequency maximum and minimum have to coincide "
+                                              "with the EDFA frequency maximum and minimum.")
+                    elif self.gain_ripple.size != self.f_ripple_ref.size:
+                        raise ParametersError("The reference ripple frequency and the gain ripple must have the same "
+                                              "size.")
+                else:
+                    self.f_ripple_ref = linspace(self.f_min, self.f_max, self.gain_ripple.size)
+
+            tilt_ripple = params['tilt_ripple']
+
+            if tilt_ripple == 0:
+                self.tilt_ripple = full(self.gain_ripple.size, 0)
+            else:
+                self.tilt_ripple = asarray(tilt_ripple)
+                if self.tilt_ripple.size != self.gain_ripple.size:
+                    raise ParametersError("The tilt ripple and the gain ripple must have the same size.")
+
+            # Power
+            self.p_max = params['p_max']
+
+            # Noise Figure
+            self.nf_model = params['nf_model']
+            self.nf_min = params['nf_min']
+            self.nf_max = params['nf_max']
+            self.nf_coef = params['nf_coef']
+            self.nf0 = params['nf0']
+            self.nf_fit_coeff = params['nf_fit_coeff']
+
+            nf_ripple = params['nf_ripple']
+            if nf_ripple == 0:
+                self.nf_ripple = full(self.gain_ripple.size, 0)
+            else:
+                self.nf_ripple = asarray(nf_ripple)
+                if self.nf_ripple.size != self.gain_ripple.size:
+                    raise ParametersError("The noise figure ripple and the gain ripple must have the same size.")
+
+            # VOA
+            self.out_voa_auto = params['out_voa_auto']
+
+            # Dual Stage
+            self.dual_stage_model = params['dual_stage_model']
+            if self.dual_stage_model is not None:
+                # Preamp
+                self.preamp_variety = params['preamp_variety']
+                self.preamp_type_def = params['preamp_type_def']
+                self.preamp_nf_model = params['preamp_nf_model']
+                self.preamp_nf_fit_coeff = params['preamp_nf_fit_coeff']
+                self.preamp_gain_min = params['preamp_gain_min']
+                self.preamp_gain_flatmax = params['preamp_gain_flatmax']
+
+                # Booster
+                self.booster_variety = params['booster_variety']
+                self.booster_type_def = params['booster_type_def']
+                self.booster_nf_model = params['booster_nf_model']
+                self.booster_nf_fit_coeff = params['booster_nf_fit_coeff']
+                self.booster_gain_min = params['booster_gain_min']
+                self.booster_gain_flatmax = params['booster_gain_flatmax']
+
+            # Others
+            self.pmd = params['pmd']
+            self.pdl = params['pdl']
+            self.raman = params['raman']
+            self.dgt = params['dgt']
+            self.advance_configurations_from_json = params['advance_configurations_from_json']
+
+            # Design
+            self.allowed_for_design = params['allowed_for_design']
+
+        except KeyError as e:
+            raise ParametersError(f'Edfa configurations json must include {e}. Configuration: {params}')

    def update_params(self, kwargs):
        for k, v in kwargs.items():
--- a/gnpy/core/science_utils.py
+++ b/gnpy/core/science_utils.py
@@ -10,9 +10,9 @@ Solver definitions to calculate the Raman effect and the nonlinear interference
 The solvers take as input instances of the spectral information, the fiber and the simulation parameters
 """

-from numpy import interp, pi, zeros, shape, where, cos, array, append, ones, exp, arange, sqrt, trapz, arcsinh, \
-    clip, abs, sum, concatenate, flip, outer, inner, transpose, max, format_float_scientific, diag, prod, argwhere, \
-    unique, argsort, cumprod
+from numpy import interp, pi, zeros, cos, array, append, ones, exp, arange, sqrt, trapz, arcsinh, clip, abs, sum, \
+    concatenate, flip, outer, inner, transpose, max, format_float_scientific, diag, sort, unique, argsort, cumprod, \
+    polyfit
 from logging import getLogger
 from scipy.constants import k, h
 from scipy.interpolate import interp1d
@@ -24,31 +24,30 @@ from gnpy.core.parameters import SimParams
 from gnpy.core.info import SpectralInformation

 logger = getLogger(__name__)
-sim_params = SimParams.get()
+sim_params = SimParams()

-def raised_cosine_comb(f, *carriers):
-    """ Returns an array storing the PSD of a WDM comb of raised cosine shaped
-    channels at the input frequencies defined in array f

-    :param f: numpy array of frequencies in Hz
-    :param carriers: namedtuple describing the WDM comb
-    :return: PSD of the WDM comb evaluated over f
+def raised_cosine(frequency, channel_frequency, channel_baud_rate, channel_roll_off):
+    """Returns a unitary raised cosine profile for the given parame
+
+    :param frequency: numpy array of frequencies in Hz for the resulting raised cosine
+    :param channel_frequency: channel frequencies in Hz
+    :param channel_baud_rate: channel baud rate in Hz
+    :param channel_roll_off: channel roll off
    """
-    psd = zeros(shape(f))
-    for carrier in carriers:
-        f_nch = carrier.frequency
-        g_ch = carrier.power.signal / carrier.baud_rate
-        ts = 1 / carrier.baud_rate
-        pass_band = (1 - carrier.roll_off) / (2 / carrier.baud_rate)
-        stop_band = (1 + carrier.roll_off) / (2 / carrier.baud_rate)
-        ff = abs(f - f_nch)
-        tf = ff - pass_band
-        if carrier.roll_off == 0:
-            psd = where(tf <= 0, g_ch, 0.) + psd
-        else:
-            psd = g_ch * (where(tf <= 0, 1., 0.) + 1 / 2 * (1 + cos(pi * ts / carrier.roll_off * tf)) *
-                          where(tf > 0, 1., 0.) * where(abs(ff) <= stop_band, 1., 0.)) + psd
-    return psd
+    raised_cosine_mask = zeros(frequency.size)
+    base_frequency = frequency - channel_frequency
+    ts = 1 / channel_baud_rate
+    pass_band = (1 - channel_roll_off) * channel_baud_rate / 2
+    stop_band = (1 + channel_roll_off) * channel_baud_rate / 2
+
+    flat_condition = (abs(base_frequency) <= pass_band) == 1
+    cosine_condition = (pass_band < abs(base_frequency)) * (abs(base_frequency) < stop_band) == 1
+
+    raised_cosine_mask[flat_condition] = 1
+    raised_cosine_mask[cosine_condition] = \
+        0.5 * (1 + cos(pi * ts / channel_roll_off * (abs(base_frequency[cosine_condition]) - pass_band)))
+    return raised_cosine_mask


 class StimulatedRamanScattering:
@@ -110,6 +109,7 @@ class RamanSolver:
            z_step = sim_params.raman_params.solver_spatial_resolution
            z = append(arange(0, fiber.params.length, z_step), fiber.params.length)
            z_final = append(arange(0, fiber.params.length, z_resolution), fiber.params.length)
+            z_final = sort(unique(concatenate((fiber.z_lumped_losses, z_final))))

            # Lumped losses array definition
            z, lumped_losses = RamanSolver._create_lumped_losses(z, fiber.lumped_losses, fiber.z_lumped_losses)
@@ -190,13 +190,13 @@ class RamanSolver:

        # calculate ase power
        ase = zeros(spectral_info.number_of_channels)
+        cr = fiber.cr(srs.frequency)[:spectral_info.number_of_channels, spectral_info.number_of_channels:]
        for i, pump in enumerate(fiber.raman_pumps):
            pump_power = srs.power_profile[spectral_info.number_of_channels + i, :]
            df = pump.frequency - frequency
            eta = - 1 / (1 - exp(h * df / (k * fiber.temperature)))
-            cr = fiber._cr_function(df)
            integral = trapz(pump_power / channels_loss, z, axis=1)
-            ase += 2 * h * baud_rate * frequency * (1 + eta) * cr * (df > 0) * integral  # 2 factor for double pol
+            ase += 2 * h * baud_rate * frequency * (1 + eta) * cr[:, i] * (df > 0) * integral  # 2 factor for double pol
        return ase

    @staticmethod
@@ -271,13 +271,16 @@ class RamanSolver:


 class NliSolver:
-    """ This class implements the NLI models.
-        Model and method can be specified in `sim_params.nli_params.method`.
-        List of implemented methods:
-        'gn_model_analytic': eq. 120 from arXiv:1209.0394
-        'ggn_spectrally_separated': eq. 21 from arXiv: 1710.02225 spectrally separated
+    """This class implements the NLI models.
+    Model and method can be specified in `sim_params.nli_params.method`.
+    List of implemented methods:
+    'gn_model_analytic': eq. 120 from arXiv:1209.0394
+    'ggn_spectrally_separated': eq. 21 from arXiv: 1710.02225
    """

+    SPM_WEIGHT = (16.0 / 27.0)
+    XPM_WEIGHT = 2 * (16.0 / 27.0)
+
    @staticmethod
    def effective_length(alpha, length):
        """The effective length identify the region in which the NLI has a significant contribution to
@@ -287,58 +290,81 @@ class NliSolver:

    @staticmethod
    def compute_nli(spectral_info: SpectralInformation, srs: StimulatedRamanScattering, fiber):
-        """ Compute NLI power generated by the WDM comb `*carriers` on the channel under test `carrier`
+        """Compute NLI power generated by the WDM comb `*carriers` on the channel under test `carrier`
        at the end of the fiber span.
        """
        logger.debug('Start computing fiber NLI noise')
-        # Physical fiber parameters
-        alpha = fiber.alpha(spectral_info.frequency)
-        beta2 = fiber.params.beta2
-        beta3 = fiber.params.beta3
-        f_ref_beta = fiber.params.ref_frequency
-        gamma = fiber.params.gamma
-        length = fiber.params.length

        if 'gn_model_analytic' == sim_params.nli_params.method:
-            nli = NliSolver._gn_analytic(spectral_info, alpha, beta2, gamma, length)
+            eta = NliSolver._gn_analytic(spectral_info, fiber)
+
+            cut_power = outer(spectral_info.signal, ones(spectral_info.number_of_channels))
+            pump_power = outer(ones(spectral_info.number_of_channels), spectral_info.signal)
+            nli_matrix = cut_power * pump_power ** 2 * eta
+            nli = sum(nli_matrix, 1)
        elif 'ggn_spectrally_separated' in sim_params.nli_params.method:
-            nli = NliSolver._ggn_spectrally_separated(spectral_info, srs, alpha, beta2, beta3, f_ref_beta, gamma)
+            if sim_params.nli_params.computed_channels is not None:
+                cut_indices = array(sim_params.nli_params.computed_channels) - 1
+            else:
+                cut_indices = array(spectral_info.channel_number) - 1
+
+            eta = NliSolver._ggn_spectrally_separated(cut_indices, spectral_info, fiber, srs)
+
+            # Interpolation over the channels not indicated as compted channels in simulation parameters
+            cut_power = outer(spectral_info.signal[cut_indices], ones(spectral_info.number_of_channels))
+            cut_frequency = spectral_info.frequency[cut_indices]
+            pump_power = outer(ones(cut_indices.size), spectral_info.signal)
+            cut_baud_rate = outer(spectral_info.baud_rate[cut_indices], ones(spectral_info.number_of_channels))
+
+            g_nli = eta * cut_power * pump_power**2 / cut_baud_rate
+            g_nli = sum(g_nli, 1)
+            g_nli = interp(spectral_info.frequency, cut_frequency, g_nli)
+            nli = spectral_info.baud_rate * g_nli  # Local white noise
        else:
            raise ValueError(f'Method {sim_params.nli_params.method} not implemented.')
+
        return nli

-    # Methods for computing GN-model
+    # Methods for computing GN-model eta matrix
    @staticmethod
-    def _gn_analytic(spectral_info: SpectralInformation, alpha, beta2, gamma, length):
-        """ Computes the nonlinear interference power evaluated at the fiber input.
+    def _gn_analytic(spectral_info, fiber, spm_weight=SPM_WEIGHT, xpm_weight=XPM_WEIGHT):
+        """Computes the nonlinear interference power evaluated at the fiber input.
        The method uses eq. 120 from arXiv:1209.0394
        """
-        spm_weight = (16.0 / 27.0) * gamma ** 2
-        xpm_weight = 2 * (16.0 / 27.0) * gamma ** 2
-
+        # Spectral Features
        nch = spectral_info.number_of_channels
+        frequency = spectral_info.frequency
+        baud_rate = spectral_info.baud_rate
+        delta_frequency = spectral_info.df
+
+        # Physical fiber parameters
+        alpha = fiber.alpha(frequency)
+        beta2 = fiber.beta2(frequency)
+        gamma = outer(fiber.gamma(frequency), ones(nch))
+        length = fiber.params.length
+
        identity = diag(ones(nch))
        weight = spm_weight * identity + xpm_weight * (ones([nch, nch]) - identity)

        effective_length = NliSolver.effective_length(alpha, length)
        asymptotic_length = 1 / alpha

-        df = spectral_info.df
-        baud_rate = spectral_info.baud_rate
+        cut_baud_rate = outer(baud_rate, ones(nch))
+        pump_baud_rate = outer(ones(nch), baud_rate)

-        psd = spectral_info.signal / baud_rate
-        ggg = outer(psd, psd**2)
-
-        psi = NliSolver._psi(df, baud_rate, beta2, effective_length, asymptotic_length)
-        g_nli = sum(weight * ggg * psi, 1)
-        nli = spectral_info.baud_rate * g_nli  # Local white noise
-        return nli
+        psi = NliSolver._psi(delta_frequency, baud_rate, beta2, effective_length, asymptotic_length)
+        eta_cut_central_frequency = gamma ** 2 * weight * psi / (cut_baud_rate * pump_baud_rate ** 2)
+        eta = cut_baud_rate * eta_cut_central_frequency  # Local white noise
+        return eta

    @staticmethod
    def _psi(df, baud_rate, beta2, effective_length, asymptotic_length):
        """Calculates eq. 123 from `arXiv:1209.0394 <https://arxiv.org/abs/1209.0394>`__"""
        cut_baud_rate = outer(baud_rate, ones(baud_rate.size))
+        cut_beta = outer(beta2, ones(baud_rate.size))
        pump_baud_rate = baud_rate
+        pump_beta = outer(ones(baud_rate.size), beta2)
+        beta2 = (cut_beta + pump_beta) / 2
        right_extreme = df + pump_baud_rate / 2
        left_extreme = df - pump_baud_rate / 2
        psi = (arcsinh(pi ** 2 * asymptotic_length * abs(beta2) * cut_baud_rate * right_extreme) -
@@ -346,112 +372,133 @@ class NliSolver:
        psi *= effective_length ** 2 / (2 * pi * abs(beta2) * asymptotic_length)
        return psi

-    # Methods for computing the GGN-model
+    # Methods for computing the GGN-model eta matrix
    @staticmethod
-    def _ggn_spectrally_separated(spectral_info: SpectralInformation, srs: StimulatedRamanScattering,
-                                  alpha, beta2, beta3, f_ref_beta, gamma):
-        """ Computes the nonlinear interference power evaluated at the fiber input.
+    def _ggn_spectrally_separated(cut_indices, spectral_info, fiber, srs, spm_weight=SPM_WEIGHT, xpm_weight=XPM_WEIGHT):
+        """Computes the nonlinear interference power evaluated at the fiber input.
        The method uses eq. 21 from arXiv: 1710.02225
        """
+        # Spectral Features
+        nch = spectral_info.number_of_channels
+        frequency = spectral_info.frequency
+        baud_rate = spectral_info.baud_rate
+        slot_width = spectral_info.slot_width
+        roll_off = spectral_info.roll_off
+
+        # Physical fiber parameters
+        alpha = fiber.alpha(frequency)
+        beta2 = fiber.beta2(frequency)
+        gamma = outer(fiber.gamma(frequency[cut_indices]), ones(nch))
+
+        identity = diag(ones(nch))
+        weight = spm_weight * identity + xpm_weight * (ones([nch, nch]) - identity)
+        weight = weight[cut_indices, :]
+
        dispersion_tolerance = sim_params.nli_params.dispersion_tolerance
        phase_shift_tolerance = sim_params.nli_params.phase_shift_tolerance
-        slot_width = max(spectral_info.slot_width)
+        max_slot_width = max(slot_width)
        delta_z = sim_params.raman_params.result_spatial_resolution
-        spm_weight = (16.0 / 27.0) * gamma ** 2
-        xpm_weight = 2 * (16.0 / 27.0) * gamma ** 2
-        cuts = [carrier for carrier in spectral_info.carriers if carrier.channel_number
-                in sim_params.nli_params.computed_channels] if sim_params.nli_params.computed_channels \
-            else spectral_info.carriers

-        g_nli = array([])
-        f_nli = array([])
-        for cut_carrier in cuts:
-            logger.debug(f'Start computing fiber NLI noise of cut: {cut_carrier}')
-            f_eval = cut_carrier.frequency
-            g_nli_computed = 0
-            g_cut = (cut_carrier.power.signal / cut_carrier.baud_rate)
-            for j, pump_carrier in enumerate(spectral_info.carriers):
-                dn = abs(pump_carrier.channel_number - cut_carrier.channel_number)
-                delta_f = abs(cut_carrier.frequency - pump_carrier.frequency)
-                k_tol = dispersion_tolerance * abs(alpha[j])
+        psi_cut_central_frequency = zeros([cut_indices.size, nch])
+        for i, cut_index in enumerate(cut_indices):
+            logger.debug(f'Start computing fiber NLI noise of cut: {cut_index + 1}')
+            cut_frequency = frequency[cut_index]
+            cut_baud_rate = baud_rate[cut_index]
+            cut_roll_off = roll_off[cut_index]
+            cut_number = cut_index + 1
+            cut_beta2 = beta2[cut_index]
+            cut_base_frequency = frequency - cut_frequency
+            cut_beta_coefficients = polyfit(cut_base_frequency, beta2, 2)
+            cut_beta3 = cut_beta_coefficients[1] / (2 * pi)
+
+            for pump_index in range(nch):
+                pump_frequency = frequency[pump_index]
+                pump_baud_rate = baud_rate[pump_index]
+                pump_roll_off = roll_off[pump_index]
+                pump_number = pump_index + 1
+                pump_alpha = alpha[pump_index]
+                dn = abs(pump_number - cut_number)
+                delta_f = abs(cut_frequency - pump_frequency)
+                k_tol = dispersion_tolerance * abs(alpha[pump_index])
                phi_tol = phase_shift_tolerance / delta_z
-                f_cut_resolution = min(k_tol, phi_tol) / abs(beta2) / (4 * pi ** 2 * (1 + dn) * slot_width)
-                f_pump_resolution = min(k_tol, phi_tol) / abs(beta2) / (4 * pi ** 2 * slot_width)
-                if dn == 0:  # SPM
-                    ggg = g_cut ** 3
-                    g_nli_computed += \
-                        spm_weight * ggg * NliSolver._generalized_psi(f_eval, cut_carrier, pump_carrier,
-                                                                      f_cut_resolution, f_pump_resolution,
-                                                                      srs, alpha[j], beta2, beta3, f_ref_beta)
+                f_cut_resolution = min(k_tol, phi_tol) / abs(cut_beta2) / (4 * pi ** 2 * (1 + dn) * max_slot_width)
+                f_pump_resolution = min(k_tol, phi_tol) / abs(cut_beta2) / (4 * pi ** 2 * max_slot_width)
+                if cut_index == pump_index:  # SPM
+                    psi_cut_central_frequency[i, pump_index] = \
+                        NliSolver._generalized_psi(cut_frequency, cut_frequency, cut_baud_rate, cut_roll_off,
+                                                   pump_frequency, pump_baud_rate, pump_roll_off, f_cut_resolution,
+                                                   f_pump_resolution, srs, pump_alpha, cut_beta2, cut_beta3,
+                                                   cut_frequency)
                else:  # XPM
-                    g_pump = (pump_carrier.power.signal / pump_carrier.baud_rate)
-                    ggg = g_cut * g_pump ** 2
-                    frequency_offset_threshold = NliSolver._frequency_offset_threshold(beta2, pump_carrier.baud_rate)
+                    frequency_offset_threshold = NliSolver._frequency_offset_threshold(cut_beta2, pump_baud_rate)
                    if abs(delta_f) <= frequency_offset_threshold:
-                        g_nli_computed += \
-                            xpm_weight * ggg * NliSolver._generalized_psi(f_eval, cut_carrier, pump_carrier,
-                                                                          f_cut_resolution, f_pump_resolution,
-                                                                          srs, alpha[j], beta2, beta3, f_ref_beta)
+                        psi_cut_central_frequency[i, pump_index] = \
+                            NliSolver._generalized_psi(cut_frequency, cut_frequency, cut_baud_rate, cut_roll_off,
+                                                       pump_frequency, pump_baud_rate, pump_roll_off, f_cut_resolution,
+                                                       f_pump_resolution, srs, pump_alpha, cut_beta2, cut_beta3,
+                                                       cut_frequency)
                    else:
-                        g_nli_computed += \
-                            xpm_weight * ggg * NliSolver._fast_generalized_psi(f_eval, cut_carrier, pump_carrier,
-                                                                               f_cut_resolution, srs, alpha[j], beta2,
-                                                                               beta3, f_ref_beta)
-            f_nli = append(f_nli, cut_carrier.frequency)
-            g_nli = append(g_nli, g_nli_computed)
-        g_nli = interp(spectral_info.frequency, f_nli, g_nli)
-        nli = spectral_info.baud_rate * g_nli  # Local white noise
-        return nli
+                        psi_cut_central_frequency[i, pump_index] = \
+                            NliSolver._fast_generalized_psi(cut_frequency, cut_frequency, cut_baud_rate, cut_roll_off,
+                                                            pump_frequency, pump_baud_rate, pump_roll_off,
+                                                            f_cut_resolution, srs, pump_alpha, cut_beta2, cut_beta3,
+                                                            cut_frequency)
+
+        cut_baud_rate = outer(baud_rate[cut_indices], ones(nch))
+        pump_baud_rate = outer(ones(cut_indices.size), baud_rate)
+
+        eta_cut_central_frequency = \
+            gamma ** 2 * weight * psi_cut_central_frequency / (cut_baud_rate * pump_baud_rate ** 2)
+        eta = cut_baud_rate * eta_cut_central_frequency  # Local white noise
+        return eta

    @staticmethod
-    def _fast_generalized_psi(f_eval, cut_carrier, pump_carrier, f_cut_resolution, srs, alpha, beta2, beta3,
-                              f_ref_beta):
-        """Computes the generalized psi function similarly to the one used in the GN model."""
-        z = srs.z
-        rho_norm = srs.rho * exp(outer(alpha/2, z))
-        rho_pump = interp1d(srs.frequency, rho_norm, axis=0)(pump_carrier.frequency)
-
-        f1_array = array([pump_carrier.frequency - (pump_carrier.baud_rate * (1 + pump_carrier.roll_off) / 2),
-                          pump_carrier.frequency + (pump_carrier.baud_rate * (1 + pump_carrier.roll_off) / 2)])
-        f2_array = arange(cut_carrier.frequency,
-                          cut_carrier.frequency + (cut_carrier.baud_rate * (1 + cut_carrier.roll_off) / 2),
-                          f_cut_resolution)  # Only positive f2 is used since integrand_f2 is symmetric
-
-        integrand_f1 = zeros(len(f1_array))
-        for f1_index, f1 in enumerate(f1_array):
-            delta_beta = 4 * pi ** 2 * (f1 - f_eval) * (f2_array - f_eval) * \
-                (beta2 + pi * beta3 * (f1 + f2_array - 2 * f_ref_beta))
-            integrand_f2 = NliSolver._generalized_rho_nli(delta_beta, rho_pump, z, alpha)
-            integrand_f1[f1_index] = 2 * trapz(integrand_f2, f2_array)  # 2x since integrand_f2 is symmetric in f2
-        generalized_psi = 0.5 * sum(integrand_f1) * pump_carrier.baud_rate
-        return generalized_psi
-
-    @staticmethod
-    def _generalized_psi(f_eval, cut_carrier, pump_carrier, f_cut_resolution, f_pump_resolution, srs, alpha, beta2,
-                         beta3, f_ref_beta):
+    def _fast_generalized_psi(f_eval, cut_frequency, cut_baud_rate, cut_roll_off, pump_frequency, pump_baud_rate,
+                              pump_roll_off, f_cut_resolution, srs, alpha, beta2, beta3, f_ref_beta):
        """Computes the generalized psi function similarly to the one used in the GN model."""
        z = srs.z
        rho_norm = srs.rho * exp(outer(alpha / 2, z))
-        rho_pump = interp1d(srs.frequency, rho_norm, axis=0)(pump_carrier.frequency)
+        rho_pump = interp1d(srs.frequency, rho_norm, axis=0)(pump_frequency)

-        f1_array = arange(pump_carrier.frequency - (pump_carrier.baud_rate * (1 + pump_carrier.roll_off) / 2),
-                          pump_carrier.frequency + (pump_carrier.baud_rate * (1 + pump_carrier.roll_off) / 2),
+        f1_array = array([pump_frequency - (pump_baud_rate * (1 + pump_roll_off) / 2),
+                          pump_frequency + (pump_baud_rate * (1 + pump_roll_off) / 2)])
+        f2_array = arange(cut_frequency, cut_frequency + (cut_baud_rate * (1 + cut_roll_off) / 2),
+                          f_cut_resolution)  # Only positive f2 is used since integrand_f2 is symmetric
+
+        integrand_f1 = zeros(f1_array.size)
+        for f1_index, f1 in enumerate(f1_array):
+            delta_beta = 4 * pi ** 2 * (f1 - f_eval) * (f2_array - f_eval) * (
+                        beta2 + pi * beta3 * (f1 + f2_array - 2 * f_ref_beta))
+            integrand_f2 = NliSolver._generalized_rho_nli(delta_beta, rho_pump, z, alpha)
+            integrand_f1[f1_index] = 2 * trapz(integrand_f2, f2_array)  # 2x since integrand_f2 is symmetric in f2
+        generalized_psi = 0.5 * sum(integrand_f1) * pump_baud_rate
+        return generalized_psi
+
+    @staticmethod
+    def _generalized_psi(f_eval, cut_frequency, cut_baud_rate, cut_roll_off, pump_frequency, pump_baud_rate,
+                         pump_roll_off, f_cut_resolution, f_pump_resolution, srs, alpha, beta2, beta3, f_ref_beta):
+        """Computes the generalized psi function similarly to the one used in the GN model."""
+        z = srs.z
+        rho_norm = srs.rho * exp(outer(alpha / 2, z))
+        rho_pump = interp1d(srs.frequency, rho_norm, axis=0)(pump_frequency)
+
+        f1_array = arange(pump_frequency - (pump_baud_rate * (1 + pump_roll_off) / 2),
+                          pump_frequency + (pump_baud_rate * (1 + pump_roll_off) / 2),
                          f_pump_resolution)
-        f2_array = arange(cut_carrier.frequency - (cut_carrier.baud_rate * (1 + cut_carrier.roll_off) / 2),
-                          cut_carrier.frequency + (cut_carrier.baud_rate * (1 + cut_carrier.roll_off) / 2),
+        f2_array = arange(cut_frequency - (cut_baud_rate * (1 + cut_roll_off) / 2),
+                          cut_frequency + (cut_baud_rate * (1 + cut_roll_off) / 2),
                          f_cut_resolution)
-        psd1 = raised_cosine_comb(f1_array, pump_carrier) * (pump_carrier.baud_rate / pump_carrier.power.signal)
+        rc1 = raised_cosine(f1_array, pump_frequency, pump_baud_rate, pump_roll_off)

-        integrand_f1 = zeros(len(f1_array))
-        for f1_index, (f1, psd1_sample) in enumerate(zip(f1_array, psd1)):
-            f3_array = f1 + f2_array - f_eval
-            psd2 = raised_cosine_comb(f2_array, cut_carrier) * (cut_carrier.baud_rate / cut_carrier.power.signal)
-            psd3 = raised_cosine_comb(f3_array, pump_carrier) * (pump_carrier.baud_rate / pump_carrier.power.signal)
-            ggg = psd1_sample * psd2 * psd3
-            delta_beta = 4 * pi**2 * (f1 - f_eval) * (f2_array - f_eval) * \
-                (beta2 + pi * beta3 * (f1 + f2_array - 2 * f_ref_beta))
-            integrand_f2 = ggg * NliSolver._generalized_rho_nli(delta_beta, rho_pump, z, alpha)
-            integrand_f1[f1_index] = trapz(integrand_f2, f2_array)
+        integrand_f1 = zeros(f1_array.size)
+        for i in range(f1_array.size):
+            f3_array = f1_array[i] + f2_array - f_eval
+            rc2 = raised_cosine(f2_array, cut_frequency, cut_baud_rate, cut_roll_off)
+            rc3 = raised_cosine(f3_array, pump_frequency, pump_baud_rate, pump_roll_off)
+            delta_beta = 4 * pi ** 2 * (f1_array[i] - f_eval) * (f2_array - f_eval) * (
+                        beta2 + pi * beta3 * (f1_array[i] + f2_array - 2 * f_ref_beta))
+            integrand_f2 = rc1[i] * rc2 * rc3 * NliSolver._generalized_rho_nli(delta_beta, rho_pump, z, alpha)
+            integrand_f1[i] = trapz(integrand_f2, f2_array)
        generalized_psi = trapz(integrand_f1, f1_array)
        return generalized_psi

--- a/gnpy/core/utils.py
+++ b/gnpy/core/utils.py
@@ -9,8 +9,9 @@ This module contains utility functions that are used with gnpy.
 """

 from csv import writer
-from numpy import pi, cos, sqrt, log10, linspace, zeros, shape, where, logical_and
+from numpy import pi, cos, sqrt, log10, linspace, zeros, shape, where, logical_and, mean
 from scipy import constants
+from copy import deepcopy

 from gnpy.core.exceptions import ConfigurationError

@@ -213,7 +214,7 @@ freq2wavelength = constants.nu2lambda


 def freq2wavelength(value):
-    """ Converts frequency units to wavelength units.
+    """Converts frequency units to wavelength units.

    >>> round(freq2wavelength(191.35e12) * 1e9, 3)
    1566.723
@@ -229,8 +230,33 @@ def snr_sum(snr, bw, snr_added, bw_added=12.5e9):
    return snr


+def per_label_average(values, labels):
+    """computes the average per defined spectrum band, using labels
+
+    >>> labels = ['A', 'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', 'B', 'B', 'B', 'B', 'C', 'D', 'D', 'D', 'D']
+    >>> values = [28.51, 28.23, 28.15, 28.17, 28.36, 28.53, 28.64, 28.68, 28.7, 28.71, 28.72, 28.73, 28.74, 28.91, 27.96, 27.85, 27.87, 28.02]
+    >>> per_label_average(values, labels)
+    {'A': 28.28, 'B': 28.68, 'C': 28.91, 'D': 27.92}
+    """
+
+    label_set = sorted(set(labels))
+    summary = {}
+    for label in label_set:
+        vals = [val for val, lab in zip(values, labels) if lab == label]
+        summary[label] = round(mean(vals), 2)
+    return summary
+
+
+def pretty_summary_print(summary):
+    """Build a prettty string that shows the summary dict values per label with 2 digits"""
+    if len(summary) == 1:
+        return f'{list(summary.values())[0]:.2f}'
+    text = ', '.join([f'{label}: {value:.2f}' for label, value in summary.items()])
+    return text
+
+
 def deltawl2deltaf(delta_wl, wavelength):
-    """ deltawl2deltaf(delta_wl, wavelength):
+    """deltawl2deltaf(delta_wl, wavelength):
    delta_wl is BW in wavelength units
    wavelength is the center wl
    units for delta_wl and wavelength must be same
@@ -248,9 +274,9 @@ def deltawl2deltaf(delta_wl, wavelength):


 def deltaf2deltawl(delta_f, frequency):
-    """ deltawl2deltaf(delta_f, frequency):
-        converts delta frequency to delta wavelength
-        units for delta_wl and wavelength must be same
+    """convert delta frequency to delta wavelength
+
+    Units for delta_wl and wavelength must be same.

    :param delta_f: delta frequency in same units as frequency
    :param frequency: frequency BW is relevant for
@@ -265,8 +291,7 @@ def deltaf2deltawl(delta_f, frequency):


 def rrc(ffs, baud_rate, alpha):
-    """ rrc(ffs, baud_rate, alpha): computes the root-raised cosine filter
-    function.
+    """compute the root-raised cosine filter function

    :param ffs: A numpy array of frequencies
    :param baud_rate: The Baud Rate of the System
@@ -292,7 +317,7 @@ def rrc(ffs, baud_rate, alpha):


 def merge_amplifier_restrictions(dict1, dict2):
-    """Updates contents of dicts recursively
+    """Update contents of dicts recursively

    >>> d1 = {'params': {'restrictions': {'preamp_variety_list': [], 'booster_variety_list': []}}}
    >>> d2 = {'params': {'target_pch_out_db': -20}}
@@ -387,3 +412,43 @@ def convert_length(value, units):
        return value * 1e3
    else:
        raise ConfigurationError(f'Cannot convert length in "{units}" into meters')
+
+
+def replace_none(dictionary):
+    """ Replaces None with inf values in a frequency slots dict
+
+    >>> replace_none({'N': 3, 'M': None})
+    {'N': 3, 'M': inf}
+
+    """
+    for key, val in dictionary.items():
+        if val is None:
+            dictionary[key] = float('inf')
+        if val == float('inf'):
+            dictionary[key] = None
+    return dictionary
+
+
+def order_slots(slots):
+    """ Order frequency slots from larger slots to smaller ones up to None
+
+    >>> l = [{'N': 3, 'M': None}, {'N': 2, 'M': 1}, {'N': None, 'M': None},{'N': 7, 'M': 2},{'N': None, 'M': 1} , {'N': None, 'M': 0}]
+    >>> order_slots(l)
+    ([7, 2, None, None, 3, None], [2, 1, 1, 0, None, None], [3, 1, 4, 5, 0, 2])
+    """
+    slots_list = deepcopy(slots)
+    slots_list = [replace_none(e) for e in slots_list]
+    for i, e in enumerate(slots_list):
+        e['i'] = i
+    slots_list = sorted(slots_list, key=lambda x: (-x['M'], x['N']) if x['M'] != float('inf') else (x['M'], x['N']))
+    slots_list = [replace_none(e) for e in slots_list]
+    return [e['N'] for e in slots_list], [e['M'] for e in slots_list], [e['i'] for e in slots_list]
+
+
+def restore_order(elements, order):
+    """ Use order to re-order the element of the list, and ignore None values
+
+    >>> restore_order([7, 2, None, None, 3, None], [3, 1, 4, 5, 0, 2])
+    [3, 2, 7]
+    """
+    return [elements[i[0]] for i in sorted(enumerate(order), key=lambda x:x[1]) if elements[i[0]] is not None]
--- a/gnpy/example-data/initial_spectrum1.json
+++ b/gnpy/example-data/initial_spectrum1.json
@@ -0,0 +1,12 @@
+{
+      "spectrum":[
+            {
+            "f_min": 191.35e12,
+            "f_max": 195.1e12,
+            "baud_rate": 32e9,
+            "slot_width": 50e9,
+            "roll_off": 0.15,
+            "tx_osnr": 40
+            }
+      ]
+}
--- a/gnpy/example-data/initial_spectrum2.json
+++ b/gnpy/example-data/initial_spectrum2.json
@@ -0,0 +1,23 @@
+{
+      "spectrum":[
+            {
+            "f_min": 191.4e12,
+            "f_max":193.1e12,
+            "baud_rate": 32e9,
+            "slot_width": 50e9,
+            "delta_pdb": 0,
+            "roll_off": 0.15,
+            "tx_osnr": 40,
+            "label": "mode_1"
+            },
+            {
+            "f_min": 193.1625e12,
+            "f_max":195e12,
+            "baud_rate": 64e9,
+            "slot_width": 75e9,
+            "roll_off": 0.15,
+            "tx_osnr": 40,
+            "label": "mode_2"
+            }
+      ]
+}
--- a/gnpy/tools/init.py
+++ b/gnpy/tools/init.py
@@ -1,5 +1,5 @@
-'''
+"""
 Processing of data via :py:mod:`.json_io`.
 Utilities for Excel conversion in :py:mod:`.convert` and :py:mod:`.service_sheet`.
 Example code in :py:mod:`.cli_examples` and :py:mod:`.plots`.
-'''
+"""
--- a/gnpy/tools/cli_examples.py
+++ b/gnpy/tools/cli_examples.py
@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

-'''
+"""
 gnpy.tools.cli_examples
 =======================

 Common code for CLI examples
-'''
+"""

 import argparse
 import logging
@@ -14,6 +14,7 @@ import sys
 from math import ceil
 from numpy import linspace, mean
 from pathlib import Path
+
 import gnpy.core.ansi_escapes as ansi_escapes
 from gnpy.core.elements import Transceiver, Fiber, RamanFiber
 from gnpy.core.equipment import trx_mode_params
@@ -26,8 +27,8 @@ from gnpy.topology.request import (ResultElement, jsontocsv, compute_path_dsjctn
                                   deduplicate_disjunctions, compute_path_with_disjunction,
                                   PathRequest, compute_constrained_path, propagate)
 from gnpy.topology.spectrum_assignment import build_oms_list, pth_assign_spectrum
-from gnpy.tools.json_io import load_equipment, load_network, load_json, load_requests, save_network, \
-                               requests_from_json, disjunctions_from_json, save_json
+from gnpy.tools.json_io import (load_equipment, load_network, load_json, load_requests, save_network,
+                                requests_from_json, disjunctions_from_json, save_json, load_initial_spectrum)
 from gnpy.tools.plots import plot_baseline, plot_results

 _logger = logging.getLogger(__name__)
@@ -47,7 +48,7 @@ def show_example_data_dir():


 def load_common_data(equipment_filename, topology_filename, simulation_filename, save_raw_network_filename):
-    '''Load common configuration from JSON files'''
+    """Load common configuration from JSON files"""

    try:
        equipment = load_equipment(equipment_filename)
@@ -84,7 +85,7 @@ def load_common_data(equipment_filename, topology_filename, simulation_filename,


 def _setup_logging(args):
-    logging.basicConfig(level={2: logging.DEBUG, 1: logging.INFO, 0: logging.CRITICAL}.get(args.verbose, logging.DEBUG))
+    logging.basicConfig(level={2: logging.DEBUG, 1: logging.INFO, 0: logging.WARNING}.get(args.verbose, logging.DEBUG))


 def _add_common_options(parser: argparse.ArgumentParser, network_default: Path):
@@ -118,6 +119,7 @@ def transmission_main_example(args=None):
    parser.add_argument('-pl', '--plot', action='store_true')
    parser.add_argument('-l', '--list-nodes', action='store_true', help='list all transceiver nodes')
    parser.add_argument('-po', '--power', default=0, help='channel ref power in dBm')
+    parser.add_argument('--spectrum', type=Path, help='user defined mixed rate spectrum JSON file')
    parser.add_argument('source', nargs='?', help='source node')
    parser.add_argument('destination', nargs='?', help='destination node')

@@ -194,12 +196,21 @@ def transmission_main_example(args=None):
    if args.power:
        trx_params['power'] = db2lin(float(args.power)) * 1e-3
    params.update(trx_params)
+    initial_spectrum = None
+    nb_channels = automatic_nch(trx_params['f_min'], trx_params['f_max'], trx_params['spacing'])
+    if args.spectrum:
+        initial_spectrum = load_initial_spectrum(args.spectrum)
+        nb_channels = len(initial_spectrum)
+        print('User input for spectrum used for propagation instead of SI')
+    params['nb_channel'] = nb_channels
    req = PathRequest(**params)
-
+    req.initial_spectrum = initial_spectrum
+    print(f'There are {nb_channels} channels propagating')
    power_mode = equipment['Span']['default'].power_mode
    print('\n'.join([f'Power mode is set to {power_mode}',
                     f'=> it can be modified in eqpt_config.json - Span']))

+    # Keep the reference channel for design: the one from SI, with full load same channels
    pref_ch_db = lin2db(req.power * 1e3)  # reference channel power / span (SL=20dB)
    pref_total_db = pref_ch_db + lin2db(req.nb_channel)  # reference total power / span (SL=20dB)
    try:
@@ -226,9 +237,13 @@ def transmission_main_example(args=None):
            power_range = list(linspace(p_start, p_stop, p_num))
        except TypeError:
            print('invalid power range definition in eqpt_config, should be power_range_db: [lower, upper, step]')
-
    for dp_db in power_range:
        req.power = db2lin(pref_ch_db + dp_db) * 1e-3
+        # if initial spectrum did not contain any power, now we need to use this one.
+        # note the initial power defines a differential wrt req.power so that if req.power is set to 2mW (3dBm)
+        # and initial spectrum was set to 0, this sets a initial per channel delta power to -3dB, so that
+        # whatever the equalization, -3 dB is applied on all channels (ie initial power in initial spectrum pre-empts
+        # "--power" option)
        if power_mode:
            print(f'\nPropagating with input power = {ansi_escapes.cyan}{lin2db(req.power*1e3):.2f} dBm{ansi_escapes.reset}:')
        else:
@@ -264,9 +279,9 @@ def transmission_main_example(args=None):
            ch_freq = final_carrier.frequency * 1e-12
            ch_power = lin2db(final_carrier.power.signal * 1e3)
            print(
-                '{:5}{:26.2f}{:26.2f}{:28.2f}{:28.2f}{:28.2f}' .format(
+                '{:5}{:26.5f}{:26.2f}{:28.2f}{:28.2f}{:28.2f}' .format(
                    final_carrier.channel_number, round(
-                        ch_freq, 2), round(
+                        ch_freq, 5), round(
                        ch_power, 2), round(
                        ch_osnr, 2), round(
                        ch_snr_nl, 2), round(
@@ -308,7 +323,7 @@ def path_requests_run(args=None):
    args = parser.parse_args(args if args is not None else sys.argv[1:])
    _setup_logging(args)

-    _logger.info(f'Computing path requests {args.service_filename} into JSON format')
+    _logger.info(f'Computing path requests {args.service_filename.name} into JSON format')

    (equipment, network) = load_common_data(args.equipment, args.topology, args.sim_params, args.save_network_before_autodesign)

@@ -316,7 +331,6 @@ def path_requests_run(args=None):
    # TODO power density: db2linp(ower_dbm": 0)/power_dbm": 0 * nb channels as defined by
    # spacing, f_min and f_max
    p_db = equipment['SI']['default'].power_dbm
-
    p_total_db = p_db + lin2db(automatic_nch(equipment['SI']['default'].f_min,
                                             equipment['SI']['default'].f_max, equipment['SI']['default'].spacing))
    try:
--- a/gnpy/tools/convert.py
+++ b/gnpy/tools/convert.py
@@ -21,18 +21,22 @@ the "east" information so that it is possible to input undirected data.
 """

 from xlrd import open_workbook
+from logging import getLogger
 from argparse import ArgumentParser
 from collections import namedtuple, Counter, defaultdict
 from itertools import chain
 from json import dumps
 from pathlib import Path
 from copy import copy
-from gnpy.core import ansi_escapes
+
 from gnpy.core.utils import silent_remove
 from gnpy.core.exceptions import NetworkTopologyError
 from gnpy.core.elements import Edfa, Fused, Fiber


+_logger = getLogger(__name__)
+
+
 def all_rows(sh, start=0):
    return (sh.row(x) for x in range(start, sh.nrows))

@@ -183,18 +187,18 @@ def parse_headers(my_sheet, input_headers_dict, headers, start_line, slice_in):
            slice_out = read_slice(my_sheet, start_line + iteration, slice_in, h0)
            iteration += 1
        if slice_out == (-1, -1):
+            msg = f'missing header {h0}'
            if h0 in ('east', 'Node A', 'Node Z', 'City'):
-                print(f'{ansi_escapes.red}CRITICAL{ansi_escapes.reset}: missing _{h0}_ header: EXECUTION ENDS')
-                raise NetworkTopologyError(f'Missing _{h0}_ header')
+                raise NetworkTopologyError(msg)
            else:
-                print(f'missing header {h0}')
+                _logger.warning(msg)
        elif not isinstance(input_headers_dict[h0], dict):
            headers[slice_out[0]] = input_headers_dict[h0]
        else:
            headers = parse_headers(my_sheet, input_headers_dict[h0], headers, start_line + 1, slice_out)
    if headers == {}:
-        print(f'{ansi_escapes.red}CRITICAL ERROR{ansi_escapes.reset}: could not find any header to read _ ABORT')
-        raise NetworkTopologyError('Could not find any header to read')
+        msg = 'CRITICAL ERROR: could not find any header to read _ ABORT'
+        raise NetworkTopologyError(msg)
    return headers


@@ -219,40 +223,76 @@ def sanity_check(nodes, links, nodes_by_city, links_by_city, eqpts_by_city):
    for l1 in links:
        for l2 in links:
            if l1 is not l2 and l1 == l2 and l2 not in duplicate_links:
-                print(f'\nWARNING\n \
+                _logger.warning(f'\nWARNING\n \
                    link {l1.from_city}-{l1.to_city} is duplicate \
                    \nthe 1st duplicate link will be removed but you should check Links sheet input')
                duplicate_links.append(l1)
-    for l in duplicate_links:
-        links.remove(l)
-        links_by_city[l.from_city].remove(l)
-        links_by_city[l.to_city].remove(l)
-
+    if duplicate_links:
+        msg = 'XLS error: ' \
+              + f'links {_format_items([(d.from_city, d.to_city) for d in duplicate_links])} are duplicate'
+        raise NetworkTopologyError(msg)
    unreferenced_nodes = [n for n in nodes_by_city if n not in links_by_city]
    if unreferenced_nodes:
-        raise NetworkTopologyError(f'{ansi_escapes.red}XLS error:{ansi_escapes.reset} The following nodes are not '
-                                   f'referenced from the {ansi_escapes.cyan}Links{ansi_escapes.reset} sheet. '
-                                   f'If unused, remove them from the {ansi_escapes.cyan}Nodes{ansi_escapes.reset} '
-                                   f'sheet:\n'
-                                   + _format_items(unreferenced_nodes))
+        msg = 'XLS error: The following nodes are not ' \
+              + 'referenced from the Links sheet. ' \
+              + 'If unused, remove them from the Nodes sheet:\n' \
+              + _format_items(unreferenced_nodes)
+        raise NetworkTopologyError(msg)
    # no need to check "Links" for invalid nodes because that's already in parse_excel()
    wrong_eqpt_from = [n for n in eqpts_by_city if n not in nodes_by_city]
    wrong_eqpt_to = [n.to_city for destinations in eqpts_by_city.values()
                     for n in destinations if n.to_city not in nodes_by_city]
    wrong_eqpt = wrong_eqpt_from + wrong_eqpt_to
    if wrong_eqpt:
-        raise NetworkTopologyError(f'{ansi_escapes.red}XLS error:{ansi_escapes.reset} '
-                                   f'The {ansi_escapes.cyan}Eqpt{ansi_escapes.reset} sheet refers to nodes that '
-                                   f'are not defined in the {ansi_escapes.cyan}Nodes{ansi_escapes.reset} sheet:\n'
-                                   + _format_items(wrong_eqpt))
+        msg = 'XLS error: ' \
+              + 'The Eqpt sheet refers to nodes that ' \
+              + 'are not defined in the Nodes sheet:\n'\
+              + _format_items(wrong_eqpt)
+        raise NetworkTopologyError(msg)
+    # Now check links that are not listed in Links sheet, and duplicates
+    bad_eqpt = []
+    possible_links = [f'{e.from_city}|{e.to_city}' for e in links] + [f'{e.to_city}|{e.from_city}' for e in links]
+    possible_eqpt = []
+    duplicate_eqpt = []
+    duplicate_ila = []
+    for city, eqpts in eqpts_by_city.items():
+        for eqpt in eqpts:
+            # Check that each node_A-node_Z exists in links
+            nodea_nodez = f'{eqpt.from_city}|{eqpt.to_city}'
+            nodez_nodea = f'{eqpt.to_city}|{eqpt.from_city}'
+            if nodea_nodez not in possible_links \
+                    or nodez_nodea not in possible_links:
+                bad_eqpt.append([eqpt.from_city, eqpt.to_city])
+            else:
+                # Check that there are no duplicate lines in the Eqpt sheet
+                if nodea_nodez in possible_eqpt:
+                    duplicate_eqpt.append([eqpt.from_city, eqpt.to_city])
+                else:
+                    possible_eqpt.append(nodea_nodez)
+            # check that there are no two lines defining an ILA with different directions
+        if nodes_by_city[city].node_type == 'ILA' and len(eqpts) > 1:
+            duplicate_ila.append(city)
+    if bad_eqpt:
+        msg = 'XLS error: ' \
+              + 'The Eqpt sheet references links that ' \
+              + 'are not defined in the Links sheet:\n' \
+              + _format_items(f'{item[0]} -> {item[1]}' for item in bad_eqpt)
+        raise NetworkTopologyError(msg)
+    if duplicate_eqpt:
+        msg = 'XLS error: Duplicate lines in Eqpt sheet:' \
+              + _format_items(f'{item[0]} -> {item[1]}' for item in duplicate_eqpt)
+        raise NetworkTopologyError(msg)
+    if duplicate_ila:
+        msg = 'XLS error: Duplicate ILA eqpt definition in Eqpt sheet:' \
+              + _format_items(duplicate_ila)
+        raise NetworkTopologyError(msg)

    for city, link in links_by_city.items():
        if nodes_by_city[city].node_type.lower() == 'ila' and len(link) != 2:
            # wrong input: ILA sites can only be Degree 2
            # => correct to make it a ROADM and remove entry in links_by_city
-            # TODO: put in log rather than print
-            print(f'invalid node type ({nodes_by_city[city].node_type})\
-                  specified in {city}, replaced by ROADM')
+            _logger.warning(f'invalid node type ({nodes_by_city[city].node_type}) '
+                            + f'specified in {city}, replaced by ROADM')
            nodes_by_city[city].node_type = 'ROADM'
            for n in nodes:
                if n.city == city:
@@ -642,17 +682,19 @@ def parse_excel(input_filename):
    # sanity check
    all_cities = Counter(n.city for n in nodes)
    if len(all_cities) != len(nodes):
-        raise ValueError(f'Duplicate city: {all_cities}')
+        msg = f'Duplicate city: {all_cities}'
+        raise NetworkTopologyError(msg)
    bad_links = []
    for lnk in links:
        if lnk.from_city not in all_cities or lnk.to_city not in all_cities:
            bad_links.append([lnk.from_city, lnk.to_city])

    if bad_links:
-        raise NetworkTopologyError(f'{ansi_escapes.red}XLS error:{ansi_escapes.reset} '
-                                   f'The {ansi_escapes.cyan}Links{ansi_escapes.reset} sheet references nodes that '
-                                   f'are not defined in the {ansi_escapes.cyan}Nodes{ansi_escapes.reset} sheet:\n'
-                                   + _format_items(f'{item[0]} -> {item[1]}' for item in bad_links))
+        msg = 'XLS error: ' \
+              + 'The Links sheet references nodes that ' \
+              + 'are not defined in the Nodes sheet:\n' \
+              + _format_items(f'{item[0]} -> {item[1]}' for item in bad_links)
+        raise NetworkTopologyError(msg)

    return nodes, links, eqpts, roadms

--- a/gnpy/tools/json_io.py
+++ b/gnpy/tools/json_io.py
@@ -1,24 +1,29 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

-'''
+"""
 gnpy.tools.json_io
 ==================

 Loading and saving data from JSON files in GNPy's internal data format
-'''
+"""

 from networkx import DiGraph
 from logging import getLogger
 from pathlib import Path
 import json
 from collections import namedtuple
-from gnpy.core import ansi_escapes, elements
+from numpy import arange
+
+from gnpy.core import elements
 from gnpy.core.equipment import trx_mode_params
 from gnpy.core.exceptions import ConfigurationError, EquipmentConfigError, NetworkTopologyError, ServiceError
 from gnpy.core.science_utils import estimate_nf_model
+from gnpy.core.info import Carrier
 from gnpy.core.utils import automatic_nch, automatic_fmax, merge_amplifier_restrictions
+from gnpy.core.parameters import DEFAULT_RAMAN_COEFFICIENT
 from gnpy.topology.request import PathRequest, Disjunction, compute_spectrum_slot_vs_bandwidth
+from gnpy.topology.spectrum_assignment import mvalue_to_slots
 from gnpy.tools.convert import xls_to_json_data
 from gnpy.tools.service_sheet import read_service_sheet

@@ -47,10 +52,9 @@ class _JsonThing:
        for k, v in default_values.items():
            setattr(self, k, clean_kwargs.get(k, v))
            if k not in clean_kwargs and name != 'Amp':
-                print(ansi_escapes.red +
-                      f'\n WARNING missing {k} attribute in eqpt_config.json[{name}]' +
-                      f'\n default value is {k} = {v}' +
-                      ansi_escapes.reset)
+                msg = f'\n WARNING missing {k} attribute in eqpt_config.json[{name}]' \
+                    + f'\n default value is {k} = {v}'
+                _logger.warning(msg)


 class SI(_JsonThing):
@@ -91,7 +95,6 @@ class Span(_JsonThing):

 class Roadm(_JsonThing):
    default_values = {
-        'target_pch_out_db': -17,
        'add_drop_osnr': 100,
        'pmd': 0,
        'pdl': 0,
@@ -102,6 +105,21 @@ class Roadm(_JsonThing):
    }

    def __init__(self, **kwargs):
+        # If equalization is not defined in equipment, then raise an error.
+        # Only one type of equalization must be defined.
+        allowed_equalisations = ['target_pch_out_db', 'target_psd_out_mWperGHz', 'target_out_mWperSlotWidth']
+        requested_eq_mask = [eq in kwargs for eq in allowed_equalisations]
+        if sum(requested_eq_mask) > 1:
+            msg = 'Only one equalization type should be set in ROADM, found: ' \
+                  + ', '.join(eq for eq in allowed_equalisations if eq in kwargs)
+            raise EquipmentConfigError(msg)
+        if not any(requested_eq_mask):
+            msg = 'No equalization type set in ROADM'
+            raise EquipmentConfigError(msg)
+        for key in allowed_equalisations:
+            if key in kwargs:
+                setattr(self, key, kwargs[key])
+                break
        self.update_attr(self.default_values, kwargs, 'Roadm')


@@ -117,6 +135,7 @@ class Transceiver(_JsonThing):
        for mode_params in self.mode:
            penalties = mode_params.get('penalties')
            mode_params['penalties'] = {}
+            mode_params['equalization_offset_db'] = mode_params.get('equalization_offset_db', 0)
            if not penalties:
                continue
            for impairment in ('chromatic_dispersion', 'pmd', 'pdl'):
@@ -146,9 +165,14 @@ class Fiber(_JsonThing):

    def __init__(self, **kwargs):
        self.update_attr(self.default_values, kwargs, self.__class__.__name__)
-        for optional in ['gamma', 'raman_efficiency']:
-            if optional in kwargs:
-                setattr(self, optional, kwargs[optional])
+        if 'gamma' in kwargs:
+            setattr(self, 'gamma', kwargs['gamma'])
+        if 'raman_efficiency' in kwargs:
+            raman_coefficient = kwargs['raman_efficiency']
+            cr = raman_coefficient.pop('cr')
+            raman_coefficient['g0'] = cr
+            raman_coefficient['reference_frequency'] = DEFAULT_RAMAN_COEFFICIENT['reference_frequency']
+            setattr(self, 'raman_coefficient', raman_coefficient)


 class RamanFiber(Fiber):
@@ -166,15 +190,24 @@ class Amp(_JsonThing):
        'p_max': None,
        'nf_model': None,
        'dual_stage_model': None,
+        'preamp_variety': None,
+        'booster_variety': None,
+        'nf_min': None,
+        'nf_max': None,
+        'nf_coef': None,
+        'nf0': None,
        'nf_fit_coeff': None,
-        'nf_ripple': None,
+        'nf_ripple': 0,
        'dgt': None,
-        'gain_ripple': None,
+        'gain_ripple': 0,
+        'tilt_ripple': 0,
+        'f_ripple_ref': None,
        'out_voa_auto': False,
        'allowed_for_design': False,
        'raman': False,
        'pmd': 0,
-        'pdl': 0
+        'pdl': 0,
+        'advance_configurations_from_json': None
    }

    def __init__(self, **kwargs):
@@ -193,7 +226,8 @@ class Amp(_JsonThing):
            try:
                nf0 = kwargs.pop('nf0')
            except KeyError:  # nf0 is expected for a fixed gain amp
-                raise EquipmentConfigError(f'missing nf0 value input for amplifier: {type_variety} in equipment config')
+                msg = f'missing nf0 value input for amplifier: {type_variety} in equipment config'
+                raise EquipmentConfigError(msg)
            for k in ('nf_min', 'nf_max'):
                try:
                    del kwargs[k]
@@ -208,7 +242,8 @@ class Amp(_JsonThing):
                nf_min = kwargs.pop('nf_min')
                nf_max = kwargs.pop('nf_max')
            except KeyError:
-                raise EquipmentConfigError(f'missing nf_min or nf_max value input for amplifier: {type_variety} in equipment config')
+                msg = f'missing nf_min or nf_max value input for amplifier: {type_variety} in equipment config'
+                raise EquipmentConfigError(msg)
            try:  # remove all remaining nf inputs
                del kwargs['nf0']
            except KeyError:
@@ -230,7 +265,8 @@ class Amp(_JsonThing):
                preamp_variety = kwargs.pop('preamp_variety')
                booster_variety = kwargs.pop('booster_variety')
            except KeyError:
-                raise EquipmentConfigError(f'missing preamp/booster variety input for amplifier: {type_variety} in equipment config')
+                msg = f'missing preamp/booster variety input for amplifier: {type_variety} in equipment config'
+                raise EquipmentConfigError(msg)
            dual_stage_def = Model_dual_stage(preamp_variety, booster_variety)
        else:
            raise EquipmentConfigError(f'Edfa type_def {type_def} does not exist')
@@ -249,11 +285,89 @@ def _automatic_spacing(baud_rate):
    return min((s[1] for s in spacing_list if s[0] > baud_rate), default=baud_rate * 1.2)


+def _spectrum_from_json(json_data):
+    """JSON_data is a list of spectrum partitions each with
+    {f_min, f_max, baud_rate, roll_off, delta_pdb, slot_width, tx_osnr, label}
+    Creates the per freq Carrier's dict.
+    f_min, f_max, baud_rate, slot_width and roll_off are mandatory
+    label, tx_osnr and delta_pdb are created if not present
+    label should be different for each partition
+    >>> json_data = {'spectrum': \
+        [{'f_min': 193.2e12, 'f_max': 193.4e12, 'slot_width': 50e9, 'baud_rate': 32e9, 'roll_off': 0.15, \
+            'delta_pdb': 1, 'tx_osnr': 45},\
+        {'f_min': 193.4625e12, 'f_max': 193.9875e12, 'slot_width': 75e9, 'baud_rate': 64e9, 'roll_off': 0.15},\
+        {'f_min': 194.075e12, 'f_max': 194.075e12, 'slot_width': 100e9, 'baud_rate': 90e9, 'roll_off': 0.15},\
+        {'f_min': 194.2e12, 'f_max': 194.35e12, 'slot_width': 50e9, 'baud_rate': 32e9, 'roll_off': 0.15}]}
+    >>> spectrum = _spectrum_from_json(json_data['spectrum'])
+    >>> for k, v in spectrum.items():
+    ...     print(f'{k}: {v}')
+    ...
+    193200000000000.0: Carrier(delta_pdb=1, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=45, label='0-32.00G')
+    193250000000000.0: Carrier(delta_pdb=1, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=45, label='0-32.00G')
+    193300000000000.0: Carrier(delta_pdb=1, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=45, label='0-32.00G')
+    193350000000000.0: Carrier(delta_pdb=1, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=45, label='0-32.00G')
+    193400000000000.0: Carrier(delta_pdb=1, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=45, label='0-32.00G')
+    193462500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193537500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193612500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193687500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193762500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193837500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193912500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    193987500000000.0: Carrier(delta_pdb=0, baud_rate=64000000000.0, slot_width=75000000000.0, roll_off=0.15, tx_osnr=40, label='1-64.00G')
+    194075000000000.0: Carrier(delta_pdb=0, baud_rate=90000000000.0, slot_width=100000000000.0, roll_off=0.15, tx_osnr=40, label='2-90.00G')
+    194200000000000.0: Carrier(delta_pdb=0, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=40, label='3-32.00G')
+    194250000000000.0: Carrier(delta_pdb=0, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=40, label='3-32.00G')
+    194300000000000.0: Carrier(delta_pdb=0, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=40, label='3-32.00G')
+    194350000000000.0: Carrier(delta_pdb=0, baud_rate=32000000000.0, slot_width=50000000000.0, roll_off=0.15, tx_osnr=40, label='3-32.00G')
+    """
+    spectrum = {}
+    json_data = sorted(json_data, key=lambda x: x['f_min'])
+    # min freq of occupation is f_min - slot_width/2 (numbering starts at 0)
+    previous_part_max_freq = 0.0
+    for index, part in enumerate(json_data):
+        # default delta_pdb is 0 dB
+        if 'delta_pdb' not in part:
+            part['delta_pdb'] = 0
+        # add a label to the partition for the printings
+        if 'label' not in part:
+            part['label'] = f'{index}-{part["baud_rate"] * 1e-9 :.2f}G'
+        # default tx_osnr is set to 40 dB
+        if 'tx_osnr' not in part:
+            part['tx_osnr'] = 40
+        # starting freq is exactly f_min to be consistent with utils.automatic_nch
+        # first partition min occupation is f_min - slot_width / 2 (central_frequency is f_min)
+        # supposes that carriers are centered on frequency
+        if previous_part_max_freq > (part['f_min'] - part['slot_width'] / 2):
+            # check that previous part last channel does not overlap on next part first channel
+            # max center of the part should be below part['f_max'] and aligned on the slot_width
+            msg = 'Not a valid initial spectrum definition:\nprevious spectrum last carrier max occupation ' +\
+                f'{previous_part_max_freq * 1e-12 :.5f}GHz ' +\
+                'overlaps on next spectrum first carrier occupation ' +\
+                f'{(part["f_min"] - part["slot_width"] / 2) * 1e-12 :.5f}GHz'
+            raise ValueError(msg)
+
+        max_range = ((part['f_max'] - part['f_min']) // part['slot_width'] + 1) * part['slot_width']
+        for current_freq in arange(part['f_min'],
+                                   part['f_min'] + max_range,
+                                   part['slot_width']):
+            spectrum[current_freq] = Carrier(delta_pdb=part['delta_pdb'], baud_rate=part['baud_rate'],
+                                             slot_width=part['slot_width'], roll_off=part['roll_off'],
+                                             tx_osnr=part['tx_osnr'], label=part['label'])
+        previous_part_max_freq = current_freq + part['slot_width'] / 2
+    return spectrum
+
+
 def load_equipment(filename):
    json_data = load_json(filename)
    return _equipment_from_json(json_data, filename)


+def load_initial_spectrum(filename):
+    json_data = load_json(filename)
+    return _spectrum_from_json(json_data['spectrum'])
+
+
 def _update_dual_stage(equipment):
    edfa_dict = equipment['Edfa']
    for edfa in edfa_dict.values():
@@ -274,9 +388,7 @@ def _update_dual_stage(equipment):


 def _roadm_restrictions_sanity_check(equipment):
-    """ verifies that booster and preamp restrictions specified in roadm equipment are listed
-    in the edfa.
-    """
+    """verifies that booster and preamp restrictions specified in roadm equipment are listed in the edfa."""
    restrictions = equipment['Roadm']['default'].restrictions['booster_variety_list'] + \
        equipment['Roadm']['default'].restrictions['preamp_variety_list']
    for amp_name in restrictions:
@@ -346,11 +458,11 @@ def load_network(filename, equipment):


 def save_network(network: DiGraph, filename: str):
-    '''Dump the network into a JSON file
+    """Dump the network into a JSON file

    :param network: network to work on
    :param filename: file to write to
-    '''
+    """
    save_json(network_to_json(network), filename)


@@ -384,14 +496,28 @@ def network_from_json(json_data, equipment):
            # well, there's no variety for the 'Fused' node type
            pass
        elif variety in equipment[typ]:
-            extra_params = equipment[typ][variety]
+            extra_params = equipment[typ][variety].__dict__
            temp = el_config.setdefault('params', {})
-            temp = merge_amplifier_restrictions(temp, extra_params.__dict__)
+            if typ == 'Roadm':
+                # if equalization is defined, remove default equalization from the extra_params
+                # If equalisation is not defined in the element config, then use the default one from equipment
+                # if more than one equalization was defined in element config, then raise an error
+                extra_params = merge_equalization(temp, extra_params)
+                if not extra_params:
+                    msg = f'ROADM {el_config["uid"]}: invalid equalization settings'
+                    raise ConfigurationError(msg)
+            temp = merge_amplifier_restrictions(temp, extra_params)
            el_config['params'] = temp
            el_config['type_variety'] = variety
-        elif (typ in ['Fiber', 'RamanFiber']) or (typ == 'Edfa' and variety not in ['default', '']):
+        elif (typ in ['Fiber', 'RamanFiber']):
            raise ConfigurationError(f'The {typ} of variety type {variety} was not recognized:'
                                     '\nplease check it is properly defined in the eqpt_config json file')
+        elif typ == 'Edfa':
+            if variety in ['default', '']:
+                el_config['params'] = Amp.default_values
+            else:
+                raise ConfigurationError(f'The Edfa of variety type {variety} was not recognized:'
+                                         '\nplease check it is properly defined in the eqpt_config json file')
        el = cls(**el_config)
        g.add_node(el)

@@ -406,7 +532,8 @@ def network_from_json(json_data, equipment):
                edge_length = 0.01
            g.add_edge(nodes[from_node], nodes[to_node], weight=edge_length)
        except KeyError:
-            raise NetworkTopologyError(f'can not find {from_node} or {to_node} defined in {cx}')
+            msg = f'can not find {from_node} or {to_node} defined in {cx}'
+            raise NetworkTopologyError(msg)

    return g

@@ -437,15 +564,13 @@ def save_json(obj, filename):


 def load_requests(filename, eqpt, bidir, network, network_filename):
-    """ loads the requests from a json or an excel file into a data string
-    """
+    """loads the requests from a json or an excel file into a data string"""
    if filename.suffix.lower() in ('.xls', '.xlsx'):
        _logger.info('Automatically converting requests from XLS to JSON')
        try:
            return convert_service_sheet(filename, eqpt, network, network_filename=network_filename, bidir=bidir)
        except ServiceError as this_e:
-            print(f'{ansi_escapes.red}Service error:{ansi_escapes.reset} {this_e}')
-            exit(1)
+            raise ServiceError(f'Service error: {this_e}')
    else:
        return load_json(filename)

@@ -457,16 +582,19 @@ def requests_from_json(json_data, equipment):
    for req in json_data['path-request']:
        # init all params from request
        params = {}
-        params['request_id'] = req['request-id']
+        params['request_id'] = f'{req["request-id"]}'
        params['source'] = req['source']
        params['bidir'] = req['bidirectional']
        params['destination'] = req['destination']
        params['trx_type'] = req['path-constraints']['te-bandwidth']['trx_type']
-        params['trx_mode'] = req['path-constraints']['te-bandwidth']['trx_mode']
+        if params['trx_type'] is None:
+            msg = f'Request {req["request-id"]} has no transceiver type defined.'
+            raise ServiceError(msg)
+        params['trx_mode'] = req['path-constraints']['te-bandwidth'].get('trx_mode', None)
        params['format'] = params['trx_mode']
        params['spacing'] = req['path-constraints']['te-bandwidth']['spacing']
        try:
-            nd_list = req['explicit-route-objects']['route-object-include-exclude']
+            nd_list = sorted(req['explicit-route-objects']['route-object-include-exclude'], key=lambda x: x['index'])
        except KeyError:
            nd_list = []
        params['nodes_list'] = [n['num-unnum-hop']['node-id'] for n in nd_list]
@@ -474,9 +602,12 @@ def requests_from_json(json_data, equipment):
        # recover trx physical param (baudrate, ...) from type and mode
        # in trx_mode_params optical power is read from equipment['SI']['default'] and
        # nb_channel is computed based on min max frequency and spacing
-        trx_params = trx_mode_params(equipment, params['trx_type'], params['trx_mode'], True)
+        try:
+            trx_params = trx_mode_params(equipment, params['trx_type'], params['trx_mode'], True)
+        except EquipmentConfigError as e:
+            msg = f'Equipment Config error in {req["request-id"]}: {e}'
+            raise EquipmentConfigError(msg) from e
        params.update(trx_params)
-        # print(trx_params['min_spacing'])
        # optical power might be set differently in the request. if it is indicated then the
        # params['power'] is updated
        try:
@@ -497,7 +628,8 @@ def requests_from_json(json_data, equipment):
                params['nb_channel'] = automatic_nch(f_min, f_max_from_si, params['spacing'])
        except KeyError:
            params['nb_channel'] = automatic_nch(f_min, f_max_from_si, params['spacing'])
-        params['effective_freq_slot'] = req['path-constraints']['te-bandwidth'].get('effective-freq-slot', [None])[0]
+        params['effective_freq_slot'] = \
+            req['path-constraints']['te-bandwidth'].get('effective-freq-slot', [{'N': None, 'M': None}])
        try:
            params['path_bandwidth'] = req['path-constraints']['te-bandwidth']['path_bandwidth']
        except KeyError:
@@ -511,44 +643,66 @@ def _check_one_request(params, f_max_from_si):
    """Checks that the requested parameters are consistant (spacing vs nb channel vs transponder mode...)"""
    f_min = params['f_min']
    f_max = params['f_max']
-    max_recommanded_nb_channels = automatic_nch(f_min, f_max, params['spacing'])
+    max_recommanded_nb_channels = automatic_nch(f_min, f_max_from_si, params['spacing'])
    if params['baud_rate'] is not None:
        # implicitly means that a mode is defined with min_spacing
        if params['min_spacing'] > params['spacing']:
            msg = f'Request {params["request_id"]} has spacing below transponder ' +\
                  f'{params["trx_type"]} {params["trx_mode"]} min spacing value ' +\
                  f'{params["min_spacing"]*1e-9}GHz.\nComputation stopped'
-            print(msg)
-            _logger.critical(msg)
            raise ServiceError(msg)
        if f_max > f_max_from_si:
-            msg = f'''Requested channel number {params["nb_channel"]}, baud rate {params["baud_rate"]} GHz
-            and requested spacing {params["spacing"]*1e-9}GHz is not consistent with frequency range
-            {f_min*1e-12} THz, {f_max*1e-12} THz, min recommanded spacing {params["min_spacing"]*1e-9}GHz.
-            max recommanded nb of channels is {max_recommanded_nb_channels}.'''
-            _logger.critical(msg)
+            msg = f'Requested channel number {params["nb_channel"]}, baud rate {params["baud_rate"] * 1e-9} GHz' \
+                  + f' and requested spacing {params["spacing"]*1e-9}GHz is not consistent with frequency range' \
+                  + f' {f_min*1e-12} THz, {f_max_from_si*1e-12} THz.' \
+                  + f' Max recommanded nb of channels is {max_recommanded_nb_channels}.'
            raise ServiceError(msg)
    # Transponder mode already selected; will it fit to the requested bandwidth?
-    if params['trx_mode'] is not None and params['effective_freq_slot'] is not None \
-            and params['effective_freq_slot']['M'] is not None:
-        _, requested_m = compute_spectrum_slot_vs_bandwidth(params['path_bandwidth'],
-                                                            params['spacing'],
-                                                            params['bit_rate'])
-        # params['effective_freq_slot']['M'] value should be bigger than the computed requested_m (simple estimate)
+    if params['trx_mode'] is not None and params['effective_freq_slot'] is not None:
+        required_nb_of_channels, requested_m = compute_spectrum_slot_vs_bandwidth(params['path_bandwidth'],
+                                                                                  params['spacing'],
+                                                                                  params['bit_rate'])
+        _, per_channel_m = compute_spectrum_slot_vs_bandwidth(params['bit_rate'],
+                                                              params['spacing'],
+                                                              params['bit_rate'])
+        # each M should fit one or more channels if it is not None
+        # spectrum slots should not overlap
+        # resulting nb of channels should be bigger than the nb computed with path_bandwidth
+        # without being splitted
        # TODO: elaborate a more accurate estimate with nb_wl * tx_osnr + possibly guardbands in case of
        # superchannel closed packing.
-
-        if requested_m > params['effective_freq_slot']['M']:
-            msg = f'requested M {params["effective_freq_slot"]["M"]} number of slots for request' +\
-                  f'{params["request_id"]} should be greater than {requested_m} to support request' +\
-                  f'{params["path_bandwidth"] * 1e-9} Gbit/s with {params["trx_type"]} {params["trx_mode"]}'
-            _logger.critical(msg)
+        nb_of_channels = 0
+        # order slots
+        slots = sorted(params['effective_freq_slot'], key=lambda x: float('inf') if x['N'] is None else x['N'])
+        for slot in slots:
+            nb_of_channels = nb_of_channels + slot['M'] // per_channel_m if slot['M'] is not None \
+                and nb_of_channels is not None else None
+            if slot['M'] is not None and slot['M'] < per_channel_m:
+                msg = f'Requested M {slot} number of slots for request' +\
+                      f' {params["request_id"]} should be greater than {per_channel_m} to support request' +\
+                      f'with {params["trx_type"]} {params["trx_mode"]}'
+                _logger.critical(msg)
+        if nb_of_channels is not None and nb_of_channels < required_nb_of_channels:
+            msg = f'Requested M {slots} number of slots for request {params["request_id"]} support {nb_of_channels}' +\
+                  f' nb of channels while {required_nb_of_channels} are required to support request' +\
+                  f' {params["path_bandwidth"] * 1e-9} Gbit/s with {params["trx_type"]} {params["trx_mode"]}'
            raise ServiceError(msg)
+        if nb_of_channels is not None:
+            _, stop0n = mvalue_to_slots(slots[0]['N'], slots[0]['M'])
+            i = 1
+            while i < len(slots):
+                slot = slots[i]
+                startn, stopn = mvalue_to_slots(slot['N'], slot['M'])
+                if startn <= stop0n:
+                    msg = f'Requested M {slots} for request {params["request_id"]} overlap'
+                    raise ServiceError(msg)
+                _, stop0n = startn, stopn
+                i += 1


 def disjunctions_from_json(json_data):
-    """ reads the disjunction requests from the json dict and create the list
-        of requested disjunctions for this set of requests
+    """reads the disjunction requests from the json dict and create the list
+    of requested disjunctions for this set of requests
    """
    disjunctions_list = []
    if 'synchronization' in json_data:
@@ -576,3 +730,42 @@ def convert_service_sheet(
    data = read_service_sheet(input_filename, eqpt, network, network_filename, bidir)
    save_json(data, output_filename)
    return data
+
+
+def find_equalisation(params, equalization_types):
+    """Find the equalization(s) defined in params. params can be a dict or a Roadm object.
+
+    >>> roadm = {'add_drop_osnr': 100, 'pmd': 1, 'pdl': 0.5,
+    ...     'restrictions': {'preamp_variety_list': ['a'], 'booster_variety_list': ['b']},
+    ...     'target_psd_out_mWperGHz': 4e-4}
+    >>> equalization_types = ['target_pch_out_db', 'target_psd_out_mWperGHz']
+    >>> find_equalisation(roadm, equalization_types)
+    {'target_pch_out_db': False, 'target_psd_out_mWperGHz': True}
+    """
+    equalization = {e: False for e in equalization_types}
+    for equ in equalization_types:
+        if equ in params:
+            equalization[equ] = True
+    return equalization
+
+
+def merge_equalization(params, extra_params):
+    """params contains ROADM element config and extra_params default values from equipment library.
+    If equalization is not defined in ROADM element use the one defined in equipment library.
+    Only one type of equalization must be defined: power (target_pch_out_db) or PSD (target_psd_out_mWperGHz)
+    or PSW (target_out_mWperSlotWidth)
+    params and extra_params are dict
+    """
+    equalization_types = ['target_pch_out_db', 'target_psd_out_mWperGHz', 'target_out_mWperSlotWidth']
+    roadm_equalizations = find_equalisation(params, equalization_types)
+    if sum(roadm_equalizations.values()) > 1:
+        # if ROADM config contains more than one equalization type then this is an error
+        return None
+    if sum(roadm_equalizations.values()) == 1:
+        # if ROADM config contains one equalization
+        # don't use the default equalization
+        return {k: v for k, v in extra_params.items() if k not in equalization_types}
+    if sum(roadm_equalizations.values()) == 0:
+        # If ROADM config doesn't contain any equalization type, keep the default one
+        return extra_params
+    return None
--- a/gnpy/tools/plots.py
+++ b/gnpy/tools/plots.py
@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

-'''
+"""
 gnpy.tools.plots
 ================

 Graphs and plots usable from a CLI application
-'''
+"""

 from matplotlib.pyplot import show, axis, figure, title, text
 from networkx import draw_networkx
--- a/gnpy/tools/service_sheet.py
+++ b/gnpy/tools/service_sheet.py
@@ -18,7 +18,6 @@ from copy import deepcopy
 from gnpy.core.utils import db2lin
 from gnpy.core.exceptions import ServiceError
 from gnpy.core.elements import Transceiver, Roadm, Edfa, Fiber
-import gnpy.core.ansi_escapes as ansi_escapes
 from gnpy.tools.convert import corresp_names, corresp_next_node

 SERVICES_COLUMN = 12
@@ -68,24 +67,21 @@ class Request_element(Element):
                if [mode for mode in equipment['Transceiver'][Request.trx_type].mode if mode['format'] == Requestmode]:
                    self.mode = Requestmode
                else:
-                    msg = f'Request Id: {self.request_id} - could not find tsp : \'{Request.trx_type}\' with mode: \'{Requestmode}\' in eqpt library \nComputation stopped.'
-                    # print(msg)
-                    logger.critical(msg)
+                    msg = f'Request Id: {self.request_id} - could not find tsp : \'{Request.trx_type}\' ' \
+                        + f'with mode: \'{Requestmode}\' in eqpt library \nComputation stopped.'
                    raise ServiceError(msg)
            else:
                Requestmode = None
                self.mode = Request.mode
        except KeyError:
-            msg = f'Request Id: {self.request_id} - could not find tsp : \'{Request.trx_type}\' with mode: \'{Request.mode}\' in eqpt library \nComputation stopped.'
-            # print(msg)
-            logger.critical(msg)
+            msg = f'Request Id: {self.request_id} - could not find tsp : \'{Request.trx_type}\' ' \
+                + f'with mode: \'{Request.mode}\' in eqpt library \nComputation stopped.'
            raise ServiceError(msg)
        # excel input are in GHz and dBm
        if Request.spacing is not None:
            self.spacing = Request.spacing * 1e9
        else:
            msg = f'Request {self.request_id} missing spacing: spacing is mandatory.\ncomputation stopped'
-            logger.critical(msg)
            raise ServiceError(msg)
        if Request.power is not None:
            self.power = db2lin(Request.power) * 1e-3
@@ -225,7 +221,7 @@ def parse_excel(input_filename):
 def parse_service_sheet(service_sheet):
    """ reads each column according to authorized fieldnames. order is not important.
    """
-    logger.info(f'Validating headers on {service_sheet.name!r}')
+    logger.debug(f'Validating headers on {service_sheet.name!r}')
    # add a test on field to enable the '' field case that arises when columns on the
    # right hand side are used as comments or drawing in the excel sheet
    header = [x.value.strip() for x in service_sheet.row(4)[0:SERVICES_COLUMN]
@@ -245,7 +241,6 @@ def parse_service_sheet(service_sheet):
        service_fieldnames = [authorized_fieldnames[e] for e in header]
    except KeyError:
        msg = f'Malformed header on Service sheet: {header} field not in {authorized_fieldnames}'
-        logger.critical(msg)
        raise ValueError(msg)
    for row in all_rows(service_sheet, start=5):
        yield Request(**parse_row(row[0:SERVICES_COLUMN], service_fieldnames))
@@ -273,15 +268,13 @@ def correct_xls_route_list(network_filename, network, pathreqlist):
    for pathreq in pathreqlist:
        # first check that source and dest are transceivers
        if pathreq.source not in transponders:
-            msg = f'{ansi_escapes.red}Request: {pathreq.request_id}: could not find' +\
-                f' transponder source : {pathreq.source}.{ansi_escapes.reset}'
-            logger.critical(msg)
+            msg = f'Request: {pathreq.request_id}: could not find' +\
+                f' transponder source : {pathreq.source}.'
            raise ServiceError(msg)

        if pathreq.destination not in transponders:
-            msg = f'{ansi_escapes.red}Request: {pathreq.request_id}: could not find' +\
-                f' transponder destination: {pathreq.destination}.{ansi_escapes.reset}'
-            logger.critical(msg)
+            msg = f'Request: {pathreq.request_id}: could not find' +\
+                f' transponder destination: {pathreq.destination}.'
            raise ServiceError(msg)
        # silently pop source and dest nodes from the list if they were added by the user as first
        # and last elem in the constraints respectively. Other positions must lead to an error
@@ -333,17 +326,16 @@ def correct_xls_route_list(network_filename, network, pathreqlist):
                            # too much ambiguity, 'b' is an ila, its name can be:
                            # Edfa0_fiber (a → b)-xx if next node is c or
                            # Edfa0_fiber (c → b)-xx if next node is a
-                            msg = f'{ansi_escapes.yellow}Invalid route node specified:' +\
-                                f'\n\t\'{n_id}\', replaced with \'{new_n}\'{ansi_escapes.reset}'
-                            logger.info(msg)
+                            msg = f'Request {pathreq.request_id}: Invalid route node specified:' \
+                                + f'\n\t\'{n_id}\', replaced with \'{new_n}\''
+                            logger.warning(msg)
                            pathreq.nodes_list[pathreq.nodes_list.index(n_id)] = new_n
                    except StopIteration:
                        # shall not come in this case, unless requested direction does not exist
-                        msg = f'{ansi_escapes.yellow}Invalid route specified {n_id}: could' +\
-                            f' not decide on direction, skipped!.\nPlease add a valid' +\
-                            f' direction in constraints (next neighbour node){ansi_escapes.reset}'
-                        print(msg)
-                        logger.info(msg)
+                        msg = f'Request {pathreq.request_id}: Invalid route specified {n_id}: could' \
+                            + ' not decide on direction, skipped!.\nPlease add a valid' \
+                            + ' direction in constraints (next neighbour node)'
+                        logger.warning(msg)
                        pathreq.loose_list.pop(pathreq.nodes_list.index(n_id))
                        pathreq.nodes_list.remove(n_id)
                else:
@@ -351,28 +343,24 @@ def correct_xls_route_list(network_filename, network, pathreqlist):
                        # if no matching can be found in the network just ignore this constraint
                        # if it is a loose constraint
                        # warns the user that this node is not part of the topology
-                        msg = f'{ansi_escapes.yellow}Invalid node specified:\n\t\'{n_id}\'' +\
-                            f', could not use it as constraint, skipped!{ansi_escapes.reset}'
-                        print(msg)
-                        logger.info(msg)
+                        msg = f'Request {pathreq.request_id}: Invalid node specified:\n\t\'{n_id}\'' \
+                            + ', could not use it as constraint, skipped!'
+                        logger.warning(msg)
                        pathreq.loose_list.pop(pathreq.nodes_list.index(n_id))
                        pathreq.nodes_list.remove(n_id)
                    else:
-                        msg = f'{ansi_escapes.red}Could not find node:\n\t\'{n_id}\' in network' +\
-                            f' topology. Strict constraint can not be applied.{ansi_escapes.reset}'
-                        logger.critical(msg)
+                        msg = f'Request {pathreq.request_id}: Could not find node:\n\t\'{n_id}\' in network' \
+                            + ' topology. Strict constraint can not be applied.'
                        raise ServiceError(msg)
            else:
                if temp.loose_list[i] == 'LOOSE':
-                    print(f'{ansi_escapes.yellow}Invalid route node specified:\n\t\'{n_id}\'' +
-                          f' type is not supported as constraint with xls network input,' +
-                          f' skipped!{ansi_escapes.reset}')
+                    logger.warning(f'Request {pathreq.request_id}: Invalid route node specified:\n\t\'{n_id}\''
+                                   + ' type is not supported as constraint with xls network input, skipped!')
                    pathreq.loose_list.pop(pathreq.nodes_list.index(n_id))
                    pathreq.nodes_list.remove(n_id)
                else:
-                    msg = f'{ansi_escapes.red}Invalid route node specified \n\t\'{n_id}\'' +\
-                        f' type is not supported as constraint with xls network input,' +\
-                        f', Strict constraint can not be applied.{ansi_escapes.reset}'
-                    logger.critical(msg)
+                    msg = f'Invalid route node specified \n\t\'{n_id}\'' \
+                        + ' type is not supported as constraint with xls network input,' \
+                        + ', Strict constraint can not be applied.'
                    raise ServiceError(msg)
    return pathreqlist
--- a/gnpy/topology/init.py
+++ b/gnpy/topology/init.py
@@ -1,3 +1,3 @@
-'''
+"""
 Tracking :py:mod:`.request` for spectrum and their :py:mod:`.spectrum_assignment`.
-'''
+"""
--- a/gnpy/topology/request.py
+++ b/gnpy/topology/request.py
@@ -23,9 +23,8 @@ from networkx.utils import pairwise
 from numpy import mean, argmin
 from gnpy.core.elements import Transceiver, Roadm
 from gnpy.core.utils import lin2db
-from gnpy.core.info import create_input_spectral_information
+from gnpy.core.info import create_input_spectral_information, carriers_to_spectral_information, ReferenceCarrier
 from gnpy.core.exceptions import ServiceError, DisjunctionError
-import gnpy.core.ansi_escapes as ansi_escapes
 from copy import deepcopy
 from csv import writer
 from math import ceil
@@ -35,15 +34,14 @@ LOGGER = getLogger(__name__)
 RequestParams = namedtuple('RequestParams', 'request_id source destination bidir trx_type'
                           ' trx_mode nodes_list loose_list spacing power nb_channel f_min'
                           ' f_max format baud_rate OSNR penalties bit_rate'
-                           ' roll_off tx_osnr min_spacing cost path_bandwidth effective_freq_slot')
+                           ' roll_off tx_osnr min_spacing cost path_bandwidth effective_freq_slot'
+                           ' equalization_offset_db')
 DisjunctionParams = namedtuple('DisjunctionParams', 'disjunction_id relaxable link_diverse'
                               ' node_diverse disjunctions_req')


 class PathRequest:
-    """ the class that contains all attributes related to a request
-    """
-
+    """the class that contains all attributes related to a request"""
    def __init__(self, *args, **params):
        params = RequestParams(**params)
        self.request_id = params.request_id
@@ -70,8 +68,10 @@ class PathRequest:
        self.cost = params.cost
        self.path_bandwidth = params.path_bandwidth
        if params.effective_freq_slot is not None:
-            self.N = params.effective_freq_slot['N']
-            self.M = params.effective_freq_slot['M']
+            self.N = [s['N'] for s in params.effective_freq_slot]
+            self.M = [s['M'] for s in params.effective_freq_slot]
+        self.initial_spectrum = None
+        self.offset_db = params.equalization_offset_db

    def __str__(self):
        return '\n\t'.join([f'{type(self).__name__} {self.request_id}',
@@ -103,8 +103,7 @@ class PathRequest:


 class Disjunction:
-    """ the class that contains all attributes related to disjunction constraints
-    """
+    """the class that contains all attributes related to disjunction constraints"""

    def __init__(self, *args, **params):
        params = DisjunctionParams(**params)
@@ -149,8 +148,7 @@ class ResultElement:

    @property
    def detailed_path_json(self):
-        """ a function that builds path object for normal and blocking cases
-        """
+        """a function that builds path object for normal and blocking cases"""
        index = 0
        pro_list = []
        for element in self.computed_path:
@@ -174,10 +172,10 @@ class ResultElement:
                temp = {
                    'path-route-object': {
                        'index': index,
-                        "label-hop": {
-                            "N": self.path_request.N,
-                            "M": self.path_request.M
-                        },
+                        "label-hop": [{
+                            "N": n,
+                            "M": m
+                        } for n, m in zip(self.path_request.N, self.path_request.M)],
                    }
                }
                pro_list.append(temp)
@@ -206,11 +204,9 @@ class ResultElement:

    @property
    def path_properties(self):
-        """ a function that returns the path properties (metrics, crossed elements) into a dict
-        """
+        """a function that returns the path properties (metrics, crossed elements) into a dict"""
        def path_metric(pth, req):
-            """ creates the metrics dictionary
-            """
+            """creates the metrics dictionary"""
            return [
                {
                    'metric-type': 'SNR-bandwidth',
@@ -252,8 +248,7 @@ class ResultElement:

    @property
    def pathresult(self):
-        """ create the result dictionnary (response for a request)
-        """
+        """create the result dictionnary (response for a request)"""
        try:
            if self.path_request.blocking_reason in BLOCKING_NOPATH:
                response = {
@@ -291,7 +286,6 @@ def compute_constrained_path(network, req):
        # been corrected and harmonized before
        msg = (f'Request {req.request_id} malformed list of nodes: last node should '
               'be destination trx')
-        LOGGER.critical(msg)
        raise ValueError()

    trx = [n for n in network if isinstance(n, Transceiver)]
@@ -306,10 +300,9 @@ def compute_constrained_path(network, req):
        path_generator = shortest_simple_paths(network, source, destination, weight='weight')
        total_path = next(path for path in path_generator if ispart(nodes_list, path))
    except NetworkXNoPath:
-        msg = (f'{ansi_escapes.yellow}Request {req.request_id} could not find a path from'
-               f' {source.uid} to node: {destination.uid} in network topology{ansi_escapes.reset}')
+        msg = (f'Request {req.request_id} could not find a path from'
+               f' {source.uid} to node: {destination.uid} in network topology')
        LOGGER.critical(msg)
-        print(msg)
        req.blocking_reason = 'NO_PATH'
        total_path = []
    except StopIteration:
@@ -318,69 +311,88 @@ def compute_constrained_path(network, req):
        # last node which is the transceiver)
        # if all nodes i n node_list are LOOSE constraint, skip the constraints and find
        # a path w/o constraints, else there is no possible path
-        print(f'{ansi_escapes.yellow}Request {req.request_id} could not find a path crossing '
-              f'{[el.uid for el in nodes_list[:-1]]} in network topology{ansi_escapes.reset}')
+        LOGGER.warning(f'Request {req.request_id} could not find a path crossing '
+                       f'{[el.uid for el in nodes_list[:-1]]} in network topology')

        if 'STRICT' not in req.loose_list[:-1]:
-            msg = (f'{ansi_escapes.yellow}Request {req.request_id} could not find a path with user_'
-                   f'include node constraints{ansi_escapes.reset}')
-            LOGGER.info(msg)
-            print(f'constraint ignored')
+            msg = (f'Request {req.request_id} could not find a path with user_'
+                   f'include node constraints. Constraint ignored')
+            LOGGER.warning(msg)
            total_path = dijkstra_path(network, source, destination, weight='weight')
        else:
            # one STRICT makes the whole list STRICT
-            msg = (f'{ansi_escapes.yellow}Request {req.request_id} could not find a path with user '
-                   f'include node constraints.\nNo path computed{ansi_escapes.reset}')
+            msg = (f'Request {req.request_id} could not find a path with user '
+                   f'include node constraints.\nNo path computed')
            LOGGER.critical(msg)
-            print(msg)
            req.blocking_reason = 'NO_PATH_WITH_CONSTRAINT'
            total_path = []
-
    return total_path


+def ref_carrier(equipment):
+    """Create a reference carier based SI information with the specified request's power:
+    req_power records the power in W that the user has defined for a given request
+    (which might be different from the one used for the design).
+    """
+    return ReferenceCarrier(baud_rate=equipment['SI']['default'].baud_rate,
+                            slot_width=equipment['SI']['default'].spacing)
+
+
 def propagate(path, req, equipment):
-    si = create_input_spectral_information(
-        req.f_min, req.f_max, req.roll_off, req.baud_rate,
-        req.power, req.spacing)
+    """propagates signals in each element according to initial spectrum set by user"""
+    if req.initial_spectrum is not None:
+        si = carriers_to_spectral_information(initial_spectrum=req.initial_spectrum,
+                                              power=req.power, ref_carrier=ref_carrier(equipment))
+    else:
+        si = create_input_spectral_information(
+            f_min=req.f_min, f_max=req.f_max, roll_off=req.roll_off, baud_rate=req.baud_rate,
+            power=req.power, spacing=req.spacing, tx_osnr=req.tx_osnr, delta_pdb=req.offset_db,
+            ref_carrier=ref_carrier(equipment))
    for i, el in enumerate(path):
        if isinstance(el, Roadm):
            si = el(si, degree=path[i+1].uid)
        else:
            si = el(si)
-    path[0].update_snr(req.tx_osnr)
+    path[0].update_snr(si.tx_osnr)
    path[0].calc_penalties(req.penalties)
    if any(isinstance(el, Roadm) for el in path):
-        path[-1].update_snr(req.tx_osnr, equipment['Roadm']['default'].add_drop_osnr)
+        path[-1].update_snr(si.tx_osnr, equipment['Roadm']['default'].add_drop_osnr)
    else:
-        path[-1].update_snr(req.tx_osnr)
+        path[-1].update_snr(si.tx_osnr)
    path[-1].calc_penalties(req.penalties)
    return si


 def propagate_and_optimize_mode(path, req, equipment):
    # if mode is unknown : loops on the modes starting from the highest baudrate fiting in the
-    # step 1: create an ordered list of modes based on baudrate
-    baudrate_to_explore = list(set([this_mode['baud_rate']
-                                    for this_mode in equipment['Transceiver'][req.tsp].mode
-                                    if float(this_mode['min_spacing']) <= req.spacing]))
+    # step 1: create an ordered list of modes based on baudrate and power offset
+    # order higher baudrate with higher power offset first
+    baudrate_offset_to_explore = list(set([(this_mode['baud_rate'], this_mode['equalization_offset_db'])
+                                           for this_mode in equipment['Transceiver'][req.tsp].mode
+                                           if float(this_mode['min_spacing']) <= req.spacing]))
    # TODO be carefull on limits cases if spacing very close to req spacing eg 50.001 50.000
-    baudrate_to_explore = sorted(baudrate_to_explore, reverse=True)
-    if baudrate_to_explore:
+    baudrate_offset_to_explore = sorted(baudrate_offset_to_explore, reverse=True)
+    if baudrate_offset_to_explore:
        # at least 1 baudrate can be tested wrt spacing
-        for this_br in baudrate_to_explore:
+        for (this_br, this_offset) in baudrate_offset_to_explore:
            modes_to_explore = [this_mode for this_mode in equipment['Transceiver'][req.tsp].mode
-                                if this_mode['baud_rate'] == this_br and
-                                float(this_mode['min_spacing']) <= req.spacing]
+                                if this_mode['baud_rate'] == this_br
+                                and float(this_mode['min_spacing']) <= req.spacing]
            modes_to_explore = sorted(modes_to_explore,
-                                      key=lambda x: x['bit_rate'], reverse=True)
-            # print(modes_to_explore)
+                                      key=lambda x: (x['bit_rate'], x['equalization_offset_db']), reverse=True)
            # step2: computes propagation for each baudrate: stop and select the first that passes
-            # TODO: the case of roll of is not included: for now use SI one
+            # TODO: the case of roll off is not included: for now use SI one
            # TODO: if the loop in mode optimization does not have a feasible path, then bugs
-            spc_info = create_input_spectral_information(req.f_min, req.f_max,
-                                                         equipment['SI']['default'].roll_off,
-                                                         this_br, req.power, req.spacing)
+            if req.initial_spectrum is not None:
+                # this case is not yet handled: spectrum can not be defined for the path-request-run function
+                # and this function is only called in this case. so coming here should not be considered yet.
+                msg = f'Request: {req.request_id} contains a unexpected initial_spectrum.'
+                raise ServiceError(msg)
+            spc_info = create_input_spectral_information(f_min=req.f_min, f_max=req.f_max,
+                                                         roll_off=equipment['SI']['default'].roll_off,
+                                                         baud_rate=this_br, power=req.power, spacing=req.spacing,
+                                                         delta_pdb=this_offset,
+                                                         tx_osnr=req.tx_osnr, ref_carrier=ref_carrier(equipment))
            for i, el in enumerate(path):
                if isinstance(el, Roadm):
                    spc_info = el(spc_info, degree=path[i+1].uid)
@@ -407,22 +419,19 @@ def propagate_and_optimize_mode(path, req, equipment):

        # returns the last propagated path and mode
        msg = f'\tWarning! Request {req.request_id}: no mode satisfies path SNR requirement.\n'
-        print(msg)
-        LOGGER.info(msg)
+        LOGGER.warning(msg)
        req.blocking_reason = 'NO_FEASIBLE_MODE'
        return path, last_explored_mode
    else:
        # no baudrate satisfying spacing
        msg = f'\tWarning! Request {req.request_id}: no baudrate satisfies spacing requirement.\n'
-        print(msg)
-        LOGGER.info(msg)
+        LOGGER.warning(msg)
        req.blocking_reason = 'NO_FEASIBLE_BAUDRATE_WITH_SPACING'
        return [], None


 def jsontopath_metric(path_metric):
-    """ a functions that reads resulting metric  from json string
-    """
+    """a functions that reads resulting metric  from json string"""
    output_snr = next(e['accumulative-value']
                      for e in path_metric if e['metric-type'] == 'SNR-0.1nm')
    output_snrbandwidth = next(e['accumulative-value']
@@ -440,9 +449,7 @@ def jsontopath_metric(path_metric):


 def jsontoparams(my_p, tsp, mode, equipment):
-    """ a function that derives optical params from transponder type and mode
-        supports the no mode case
-    """
+    """a function that derives optical params from transponder type and mode supports the no mode case"""
    temp = []
    for elem in my_p['path-properties']['path-route-objects']:
        if 'num-unnum-hop' in elem['path-route-object']:
@@ -452,8 +459,8 @@ def jsontoparams(my_p, tsp, mode, equipment):
    temp2 = []
    for elem in my_p['path-properties']['path-route-objects']:
        if 'label-hop' in elem['path-route-object'].keys():
-            temp2.append(f'{elem["path-route-object"]["label-hop"]["N"]}, ' +
-                         f'{elem["path-route-object"]["label-hop"]["M"]}')
+            temp2.append(f'{[e["N"] for e in elem["path-route-object"]["label-hop"]]}, '
+                         + f'{[e["M"] for e in elem["path-route-object"]["label-hop"]]}')
    # OrderedDict.fromkeys returns the unique set of strings.
    # TODO: if spectrum changes along the path, we should be able to give the segments
    #       eg for regeneration case
@@ -477,10 +484,10 @@ def jsontoparams(my_p, tsp, mode, equipment):


 def jsontocsv(json_data, equipment, fileout):
-    """ reads json path result file in accordance with:
-        Yang model for requesting Path Computation
-        draft-ietf-teas-yang-path-computation-01.txt.
-        and write results in an CSV file
+    """reads json path result file in accordance with:
+    Yang model for requesting Path Computation
+    draft-ietf-teas-yang-path-computation-01.txt.
+    and write results in an CSV file
    """
    mywriter = writer(fileout)
    mywriter.writerow(('response-id', 'source', 'destination', 'path_bandwidth', 'Pass?',
@@ -815,13 +822,13 @@ def compute_path_dsjctn(network, equipment, pathreqlist, disjunctions_list):
                    if not ispart(allpaths[id(pth)].req.nodes_list, pth):
                        testispartok = False
                        if 'STRICT' in allpaths[id(pth)].req.loose_list:
-                            LOGGER.info(f'removing solution from candidate paths\n{pth}')
+                            LOGGER.debug(f'removing solution from candidate paths\n{pth}')
                            testispartnokloose = False
                            break
            if testispartok:
                temp.append(sol)
            elif testispartnokloose:
-                LOGGER.info(f'Adding solution as alternate solution not satisfying constraint\n{pth}')
+                LOGGER.debug(f'Adding solution as alternate solution not satisfying constraint\n{pth}')
                alternatetemp.append(sol)
        if temp:
            candidates[this_d.disjunction_id] = temp
@@ -843,9 +850,7 @@ def compute_path_dsjctn(network, equipment, pathreqlist, disjunctions_list):
                    # remove duplicated candidates
                    candidates = remove_candidate(candidates, allpaths, allpaths[id(pth)].req, pth)
        else:
-            msg = f'No disjoint path found with added constraint'
-            LOGGER.critical(msg)
-            print(f'{msg}\nComputation stopped.')
+            msg = 'No disjoint path found with added constraint\nComputation stopped.'
            # TODO in this case: replay step 5  with the candidate without constraints
            raise DisjunctionError(msg)

@@ -866,8 +871,7 @@ def compute_path_dsjctn(network, equipment, pathreqlist, disjunctions_list):


 def isdisjoint(pth1, pth2):
-    """ returns 0 if disjoint
-    """
+    """returns 0 if disjoint"""
    edge1 = list(pairwise(pth1))
    edge2 = list(pairwise(pth2))
    for edge in edge1:
@@ -877,9 +881,9 @@ def isdisjoint(pth1, pth2):


 def find_reversed_path(pth):
-    """ select of intermediate roadms and find the path between them
-        note that this function may not give an exact result in case of multiple
-        links between two adjacent nodes.
+    """select of intermediate roadms and find the path between them
+    note that this function may not give an exact result in case of multiple
+    links between two adjacent nodes.
    """
    # TODO add some indication on elements to indicate from which other they
    # are the reversed direction. This is partly done with oms indication
@@ -902,9 +906,8 @@ def find_reversed_path(pth):
            # concatenation should be [roadma el1 el2 roadmb el3 el4 roadmc]
            reversed_path = list(OrderedDict.fromkeys(reversed_path))
        else:
-            msg = f'Error while handling reversed path {pth[-1].uid} to {pth[0].uid}:' +\
-                ' can not handle unidir topology. TO DO.'
-            LOGGER.critical(msg)
+            msg = f'Error while handling reversed path {pth[-1].uid} to {pth[0].uid}:' \
+                + ' can not handle unidir topology. TO DO.'
            raise ValueError(msg)
    reversed_path.append(pth[0])

@@ -912,9 +915,7 @@ def find_reversed_path(pth):


 def ispart(ptha, pthb):
-    """ the functions takes two paths a and b and retrns True
-        if all a elements are part of b and in the same order
-    """
+    """the functions takes two paths a and b and retrns True if all a elements are part of b and in the same order"""
    j = 0
    for elem in ptha:
        if elem in pthb:
@@ -928,8 +929,7 @@ def ispart(ptha, pthb):


 def remove_candidate(candidates, allpaths, rqst, pth):
-    """ filter duplicate candidates
-    """
+    """filter duplicate candidates"""
    # print(f'coucou {rqst.request_id}')
    for key, candidate in candidates.items():
        temp = candidate.copy()
@@ -944,8 +944,7 @@ def remove_candidate(candidates, allpaths, rqst, pth):


 def compare_reqs(req1, req2, disjlist):
-    """ compare two requests: returns True or False
-    """
+    """compare two requests: returns True or False"""
    dis1 = [d for d in disjlist if req1.request_id in d.disjunctions_req]
    dis2 = [d for d in disjlist if req2.request_id in d.disjunctions_req]
    same_disj = False
@@ -978,28 +977,31 @@ def compare_reqs(req1, req2, disjlist):
            req1.format == req2.format and \
            req1.OSNR == req2.OSNR and \
            req1.roll_off == req2.roll_off and \
-            same_disj and \
-            getattr(req1, 'N', None) is None and getattr(req2, 'N', None) is None and \
-            getattr(req1, 'M', None) is None and getattr(req2, 'M', None) is None:
+            same_disj:
        return True
    else:
        return False


 def requests_aggregation(pathreqlist, disjlist):
-    """ this function aggregates requests so that if several requests
-        exist between same source and destination and with same transponder type
+    """this function aggregates requests so that if several requests
+    exist between same source and destination and with same transponder type
+    If transponder mode is defined and identical, then also agregates demands.
    """
    # todo maybe add conditions on mode ??, spacing ...
    # currently if undefined takes the default values
    local_list = pathreqlist.copy()
    for req in pathreqlist:
        for this_r in local_list:
-            if req.request_id != this_r.request_id and compare_reqs(req, this_r, disjlist):
+            if req.request_id != this_r.request_id and compare_reqs(req, this_r, disjlist) and\
+                    this_r.tsp_mode is not None:
                # aggregate
                this_r.path_bandwidth += req.path_bandwidth
+                this_r.N = this_r.N + req.N
+                this_r.M = this_r.M + req.M
                temp_r_id = this_r.request_id
                this_r.request_id = ' | '.join((this_r.request_id, req.request_id))
+
                # remove request from list
                local_list.remove(req)
                # todo change also disjunction req with new demand
@@ -1016,23 +1018,22 @@ def requests_aggregation(pathreqlist, disjlist):


 def correct_json_route_list(network, pathreqlist):
-    """ all names in list should be exact name in the network, and there is no ambiguity
-        This function only checks that list is correct, warns user if the name is incorrect and
-        suppresses the constraint it it is loose or raises an error if it is strict
+    """all names in list should be exact name in the network, and there is no ambiguity
+
+    This function only checks that list is correct, warns user if the name is incorrect and
+    suppresses the constraint it it is loose or raises an error if it is strict
    """
    all_uid = [n.uid for n in network.nodes()]
    transponders = [n.uid for n in network.nodes() if isinstance(n, Transceiver)]
    for pathreq in pathreqlist:
        if pathreq.source not in transponders:
-            msg = f'{ansi_escapes.red}Request: {pathreq.request_id}: could not find transponder' +\
-                f' source : {pathreq.source}.{ansi_escapes.reset}'
-            LOGGER.critical(msg)
+            msg = f'Request: {pathreq.request_id}: could not find transponder' \
+                + f' source : {pathreq.source}.'
            raise ServiceError(msg)

        if pathreq.destination not in transponders:
-            msg = f'{ansi_escapes.red}Request: {pathreq.request_id}: could not find transponder' +\
-                f' destination : {pathreq.destination}.{ansi_escapes.reset}'
-            LOGGER.critical(msg)
+            msg = f'Request: {pathreq.request_id}: could not find transponder' \
+                + f' destination : {pathreq.destination}.'
            raise ServiceError(msg)

        # silently remove source and dest nodes from the list
@@ -1051,24 +1052,21 @@ def correct_json_route_list(network, pathreqlist):
                    # if no matching can be found in the network just ignore this constraint
                    # if it is a loose constraint
                    # warns the user that this node is not part of the topology
-                    msg = f'{ansi_escapes.yellow}invalid route node specified:\n\t\'{n_id}\',' +\
-                        f' could not use it as constraint, skipped!{ansi_escapes.reset}'
-                    print(msg)
-                    LOGGER.info(msg)
+                    msg = f'invalid route node specified:\n\t\'{n_id}\',' \
+                        + ' could not use it as constraint, skipped!'
+                    LOGGER.warning(msg)
                    pathreq.loose_list.pop(pathreq.nodes_list.index(n_id))
                    pathreq.nodes_list.remove(n_id)
                else:
-                    msg = f'{ansi_escapes.red}could not find node:\n\t \'{n_id}\' in network' +\
-                        f' topology. Strict constraint can not be applied.{ansi_escapes.reset}'
-                    LOGGER.critical(msg)
+                    msg = f'could not find node:\n\t \'{n_id}\' in network' \
+                        + ' topology. Strict constraint can not be applied.'
                    raise ServiceError(msg)

    return pathreqlist


 def deduplicate_disjunctions(disjn):
-    """ clean disjunctions to remove possible repetition
-    """
+    """clean disjunctions to remove possible repetition"""
    local_disjn = disjn.copy()
    for elem in local_disjn:
        for dis_elem in local_disjn:
@@ -1079,8 +1077,9 @@ def deduplicate_disjunctions(disjn):


 def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
-    """ use a list but a dictionnary might be helpful to find path based on request_id
-        TODO change all these req, dsjct, res lists into dict !
+    """use a list but a dictionnary might be helpful to find path based on request_id
+
+    TODO change all these req, dsjct, res lists into dict !
    """
    path_res_list = []
    reversed_path_res_list = []
@@ -1091,10 +1090,10 @@ def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
        # use the power specified in requests but might be different from the one
        # specified for design the power is an optional parameter for requests
        # definition if optional, use the one defines in eqt_config.json
-        print(f'request {pathreq.request_id}')
-        print(f'Computing path from {pathreq.source} to {pathreq.destination}')
-        # adding first node to be clearer on the output
-        print(f'with path constraint: {[pathreq.source] + pathreq.nodes_list}')
+        msg = f'\n\trequest {pathreq.request_id}\n' \
+              + f'\tComputing path from {pathreq.source} to {pathreq.destination}\n' \
+              + f'\twith path constraint: {[pathreq.source] + pathreq.nodes_list}'
+        # # adding first node to be clearer on the output

        # pathlist[i] contains the whole path information for request i
        # last element is a transciver and where the result of the propagation is
@@ -1104,7 +1103,8 @@ def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
        # may use the same transponder for the performance simulation. This is why
        # we use deepcopy: to ensure that each propagation is recorded and not overwritten
        total_path = deepcopy(pathlist[i])
-        print(f'Computed path (roadms):{[e.uid for e in total_path  if isinstance(e, Roadm)]}')
+        msg = msg + f'\n\tComputed path (roadms):{[e.uid for e in total_path  if isinstance(e, Roadm)]}'
+        LOGGER.info(msg)
        # for debug
        # print(f'{pathreq.baud_rate}   {pathreq.power}   {pathreq.spacing}   {pathreq.nb_channel}')
        if total_path:
@@ -1115,14 +1115,12 @@ def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
                snr01nm_with_penalty = total_path[-1].snr_01nm - total_path[-1].total_penalty
                min_ind = argmin(snr01nm_with_penalty)
                if round(snr01nm_with_penalty[min_ind], 2) < pathreq.OSNR + equipment['SI']['default'].sys_margins:
-                    msg = f'\tWarning! Request {pathreq.request_id} computed path from' +\
-                          f' {pathreq.source} to {pathreq.destination} does not pass with {pathreq.tsp_mode}' +\
-                          f'\n\tcomputed SNR in 0.1nm = {round(total_path[-1].snr_01nm[min_ind], 2)}' +\
-                          f'\n\tCD penalty = {round(total_path[-1].penalties["chromatic_dispersion"][min_ind], 2)}' +\
-                          f'\n\tPMD penalty = {round(total_path[-1].penalties["pmd"][min_ind], 2)}' +\
-                          f'\n\trequired osnr = {pathreq.OSNR}' +\
-                          f'\n\tsystem margin = {equipment["SI"]["default"].sys_margins}'
-                    print(msg)
+                    msg = f'\tWarning! Request {pathreq.request_id} computed path from' \
+                          + f' {pathreq.source} to {pathreq.destination} does not pass with {pathreq.tsp_mode}' \
+                          + f'\n\tcomputed SNR in 0.1nm = {round(total_path[-1].snr_01nm[min_ind], 2)}'
+                    msg = _penalty_msg(total_path, msg, min_ind) \
+                        + f'\n\trequired osnr = {pathreq.OSNR}' \
+                        + f'\n\tsystem margin = {equipment["SI"]["default"].sys_margins}'
                    LOGGER.warning(msg)
                    pathreq.blocking_reason = 'MODE_NOT_FEASIBLE'
            else:
@@ -1158,22 +1156,20 @@ def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
            if pathreq.bidir and pathreq.baud_rate is not None:
                # Both directions requested, and a feasible mode was found
                rev_p = deepcopy(reversed_path)
-
-                print(f'\n\tPropagating Z to A direction {pathreq.destination} to {pathreq.source}')
-                print(f'\tPath (roadsm) {[r.uid for r in rev_p if isinstance(r,Roadm)]}\n')
+                msg = f'\n\tPropagating Z to A direction {pathreq.destination} to {pathreq.source}\n' \
+                      + f'\tPath (roadms) {[r.uid for r in rev_p if isinstance(r,Roadm)]}\n'
+                LOGGER.info(msg)
                propagate(rev_p, pathreq, equipment)
                propagated_reversed_path = rev_p
                snr01nm_with_penalty = rev_p[-1].snr_01nm - rev_p[-1].total_penalty
                min_ind = argmin(snr01nm_with_penalty)
                if round(snr01nm_with_penalty[min_ind], 2) < pathreq.OSNR + equipment['SI']['default'].sys_margins:
-                    msg = f'\tWarning! Request {pathreq.request_id} computed path from' +\
-                          f' {pathreq.source} to {pathreq.destination} does not pass with {pathreq.tsp_mode}' +\
-                          f'\n\tcomputed SNR in 0.1nm = {round(rev_p[-1].snr_01nm[min_ind], 2)}' +\
-                          f'\n\tCD penalty = {round(rev_p[-1].penalties["chromatic_dispersion"][min_ind], 2)}' +\
-                          f'\n\tPMD penalty = {round(rev_p[-1].penalties["pmd"][min_ind], 2)}' +\
-                          f'\n\trequired osnr = {pathreq.OSNR}' +\
-                          f'\n\tsystem margin = {equipment["SI"]["default"].sys_margins}'
-                    print(msg)
+                    msg = f'\tWarning! Request {pathreq.request_id} computed path from' \
+                          + f' {pathreq.destination} to {pathreq.source} does not pass with {pathreq.tsp_mode}' \
+                          + f'\n\tcomputed SNR in 0.1nm = {round(rev_p[-1].snr_01nm[min_ind], 2)}'
+                    msg = _penalty_msg(rev_p, msg, min_ind) \
+                        + f'\n\trequired osnr = {pathreq.OSNR}' \
+                        + f'\n\tsystem margin = {equipment["SI"]["default"].sys_margins}'
                    LOGGER.warning(msg)
                    # TODO selection of mode should also be on reversed direction !!
                    if not hasattr(pathreq, 'blocking_reason'):
@@ -1181,9 +1177,8 @@ def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
            else:
                propagated_reversed_path = []
        else:
-            msg = 'Total path is empty. No propagation'
-            print(msg)
-            LOGGER.info(msg)
+            msg = f'Request {pathreq.request_id}: Total path is empty. No propagation'
+            LOGGER.warning(msg)
            reversed_path = []
            propagated_reversed_path = []

@@ -1191,12 +1186,12 @@ def compute_path_with_disjunction(network, equipment, pathreqlist, pathlist):
        reversed_path_res_list.append(reversed_path)
        propagated_reversed_path_res_list.append(propagated_reversed_path)
        # print to have a nice output
-        print('')
    return path_res_list, reversed_path_res_list, propagated_reversed_path_res_list


 def compute_spectrum_slot_vs_bandwidth(bandwidth, spacing, bit_rate, slot_width=0.0125e12):
-    """ Compute the number of required wavelengths and the M value (number of consumed slots)
+    """Compute the number of required wavelengths and the M value (number of consumed slots)
+
    Each wavelength consumes one `spacing`, and the result is rounded up to consume a natural number of slots.

    >>> compute_spectrum_slot_vs_bandwidth(400e9, 50e9, 200e9)
@@ -1205,3 +1200,19 @@ def compute_spectrum_slot_vs_bandwidth(bandwidth, spacing, bit_rate, slot_width=
    number_of_wavelengths = ceil(bandwidth / bit_rate)
    total_number_of_slots = ceil(spacing / slot_width) * number_of_wavelengths
    return number_of_wavelengths, total_number_of_slots
+
+
+def _penalty_msg(total_path, msg, min_ind):
+    """formatting helper for reporting unfeasible paths
+
+    The penalty info are optional, so this checks that penalty exists before creating a message."""
+    penalty_dict = {
+        'pdl': 'PDL',
+        'chromatic_dispersion': 'CD',
+        'pmd': 'PMD'}
+    for key, pretty in penalty_dict.items():
+        if key in total_path[-1].penalties:
+            msg += f'\n\t{pretty} penalty = {round(total_path[-1].penalties[key][min_ind], 2)}'
+        else:
+            msg += f'\n\t{pretty} penalty not evaluated'
+    return msg
--- a/gnpy/topology/spectrum_assignment.py
+++ b/gnpy/topology/spectrum_assignment.py
@@ -17,14 +17,14 @@ from collections import namedtuple
 from logging import getLogger
 from gnpy.core.elements import Roadm, Transceiver
 from gnpy.core.exceptions import ServiceError, SpectrumError
+from gnpy.core.utils import order_slots, restore_order
 from gnpy.topology.request import compute_spectrum_slot_vs_bandwidth

 LOGGER = getLogger(__name__)


 class Bitmap:
-    """ records the spectrum occupation
-    """
+    """records the spectrum occupation"""

    def __init__(self, f_min, f_max, grid, guardband=0.15e12, bitmap=None):
        # n is the min index including guardband. Guardband is require to be sure
@@ -45,26 +45,22 @@ class Bitmap:
            raise SpectrumError(f'bitmap is not consistant with f_min{f_min} - n: {n_min} and f_max{f_max}- n :{n_max}')

    def getn(self, i):
-        """ converts the n (itu grid) into a local index
-        """
+        """converts the n (itu grid) into a local index"""
        return self.freq_index[i]

    def geti(self, nvalue):
-        """ converts the local index into n (itu grid)
-        """
+        """converts the local index into n (itu grid)"""
        return self.freq_index.index(nvalue)

    def insert_left(self, newbitmap):
-        """ insert bitmap on the left to align oms bitmaps if their start frequencies are different
-        """
+        """insert bitmap on the left to align oms bitmaps if their start frequencies are different"""
        self.bitmap = newbitmap + self.bitmap
        temp = list(range(self.n_min - len(newbitmap), self.n_min))
        self.freq_index = temp + self.freq_index
        self.n_min = self.freq_index[0]

    def insert_right(self, newbitmap):
-        """ insert bitmap on the right to align oms bitmaps if their stop frequencies are different
-        """
+        """insert bitmap on the right to align oms bitmaps if their stop frequencies are different"""
        self.bitmap = self.bitmap + newbitmap
        self.freq_index = self.freq_index + list(range(self.n_max, self.n_max + len(newbitmap)))
        self.n_max = self.freq_index[-1]
@@ -75,8 +71,8 @@ OMSParams = namedtuple('OMSParams', 'oms_id el_id_list el_list')


 class OMS:
-    """ OMS class is the logical container that represent a link between two adjacent ROADMs and
-        records the crossed elements and the occupied spectrum
+    """OMS class is the logical container that represent a link between two adjacent ROADMs and
+    records the crossed elements and the occupied spectrum
    """

    def __init__(self, *args, **params):
@@ -98,36 +94,28 @@ class OMS:
                            f'{self.el_id_list[0]} - {self.el_id_list[-1]}', '\n'])

    def add_element(self, elem):
-        """ records oms elements
-        """
+        """records oms elements"""
        self.el_id_list.append(elem.uid)
        self.el_list.append(elem)

-    def update_spectrum(self, f_min, f_max, guardband=0.15e12, existing_spectrum=None,
-                        grid=0.00625e12):
-        """ frequencies expressed in Hz
+    def update_spectrum(self, f_min, f_max, guardband=0.15e12, existing_spectrum=None, grid=0.00625e12):
+        """Frequencies expressed in Hz.
+        Add 150 GHz margin to enable a center channel on f_min
+        Use ITU-T G694.1 Flexible DWDM grid definition
+        For the flexible DWDM grid, the allowed frequency slots have a nominal central frequency (in THz) defined by:
+        193.1 + n × 0.00625 where n is a positive or negative integer including 0
+        and 0.00625 is the nominal central frequency granularity in THz
+        and a slot width defined by:
+        12.5 × m where m is a positive integer and 12.5 is the slot width granularity in GHz.
+        Any combination of frequency slots is allowed as long as no two frequency slots overlap.
+        If bitmap is not None, then use it: Bitmap checks its consistency with f_min f_max
+        else a brand new bitmap is created
        """
-        if existing_spectrum is None:
-            # add some 150 GHz margin to enable a center channel on f_min
-            # use ITU-T G694.1
-            # Flexible DWDM grid definition
-            # For the flexible DWDM grid, the allowed frequency slots have a nominal
-            # central frequency (in THz) defined by:
-            # 193.1 + n × 0.00625 where n is a positive or negative integer including 0
-            # and 0.00625 is the nominal central frequency granularity in THz
-            # and a slot width defined by:
-            # 12.5 × m where m is a positive integer and 12.5 is the slot width granularity in
-            # GHz.
-            # Any combination of frequency slots is allowed as long as no two frequency
-            # slots overlap.
-
-            # TODO : add explaination on that / parametrize ....
-            self.spectrum_bitmap = Bitmap(f_min, f_max, grid, guardband)
-            # print(len(self.spectrum_bitmap.bitmap))
+        self.spectrum_bitmap = Bitmap(f_min=f_min, f_max=f_max, grid=grid, guardband=guardband,
+                                      bitmap=existing_spectrum)

    def assign_spectrum(self, nvalue, mvalue):
-        """ change oms spectrum to mark spectrum assigned
-        """
+        """change oms spectrum to mark spectrum assigned"""
        if not isinstance(nvalue, int):
            raise SpectrumError(f'N must be a signed integer, got {nvalue}')
        if not isinstance(mvalue, int):
@@ -146,16 +134,16 @@ class OMS:
        self.spectrum_bitmap.bitmap[self.spectrum_bitmap.geti(startn):self.spectrum_bitmap.geti(stopn) + 1] = [0] * (stopn - startn + 1)

    def add_service(self, service_id, nb_wl):
-        """ record service and mark spectrum as occupied
-        """
+        """record service and mark spectrum as occupied"""
        self.service_list.append(service_id)
        self.nb_channels += nb_wl


 def frequency_to_n(freq, grid=0.00625e12):
-    """ converts frequency into the n value (ITU grid)
-        reference to Recommendation G.694.1 (02/12), Figure I.3
-        https://www.itu.int/rec/T-REC-G.694.1-201202-I/en
+    """converts frequency into the n value (ITU grid)
+
+    reference to Recommendation G.694.1 (02/12), Figure I.3
+    https://www.itu.int/rec/T-REC-G.694.1-201202-I/en

    >>> frequency_to_n(193.1375e12)
    6
@@ -167,9 +155,10 @@ def frequency_to_n(freq, grid=0.00625e12):


 def nvalue_to_frequency(nvalue, grid=0.00625e12):
-    """ converts n value into a frequency
-        reference to Recommendation G.694.1 (02/12), Table 1
-        https://www.itu.int/rec/T-REC-G.694.1-201202-I/en
+    """converts n value into a frequency
+
+    reference to Recommendation G.694.1 (02/12), Table 1
+    https://www.itu.int/rec/T-REC-G.694.1-201202-I/en

    >>> nvalue_to_frequency(6)
    193137500000000.0
@@ -181,17 +170,17 @@ def nvalue_to_frequency(nvalue, grid=0.00625e12):


 def mvalue_to_slots(nvalue, mvalue):
-    """ convert center n an m into start and stop n
-    """
+    """convert center n an m into start and stop n"""
    startn = nvalue - mvalue
    stopn = nvalue + mvalue - 1
    return startn, stopn


 def slots_to_m(startn, stopn):
-    """ converts the start and stop n values to the center n and m value
-        reference to Recommendation G.694.1 (02/12), Figure I.3
-        https://www.itu.int/rec/T-REC-G.694.1-201202-I/en
+    """converts the start and stop n values to the center n and m value
+
+    reference to Recommendation G.694.1 (02/12), Figure I.3
+    https://www.itu.int/rec/T-REC-G.694.1-201202-I/en

    >>> nval, mval = slots_to_m(6, 20)
    >>> nval
@@ -206,10 +195,11 @@ def slots_to_m(startn, stopn):


 def m_to_freq(nvalue, mvalue, grid=0.00625e12):
-    """ converts m into frequency range
-        spectrum(13,7) is (193137500000000.0, 193225000000000.0)
-        reference to Recommendation G.694.1 (02/12), Figure I.3
-        https://www.itu.int/rec/T-REC-G.694.1-201202-I/en
+    """converts m into frequency range
+
+    spectrum(13,7) is (193137500000000.0, 193225000000000.0)
+    reference to Recommendation G.694.1 (02/12), Figure I.3
+    https://www.itu.int/rec/T-REC-G.694.1-201202-I/en

    >>> fstart, fstop = m_to_freq(13, 7)
    >>> fstart
@@ -225,9 +215,7 @@ def m_to_freq(nvalue, mvalue, grid=0.00625e12):


 def align_grids(oms_list):
-    """ used to apply same grid to all oms : same starting n, stop n and slot size
-        out of grid slots are set to 0
-    """
+    """Used to apply same grid to all oms : same starting n, stop n and slot size. Out of grid slots are set to 0."""
    n_min = min([o.spectrum_bitmap.n_min for o in oms_list])
    n_max = max([o.spectrum_bitmap.n_max for o in oms_list])
    for this_o in oms_list:
@@ -239,12 +227,13 @@ def align_grids(oms_list):


 def build_oms_list(network, equipment):
-    """ initialization of OMS list in the network
-        an oms is build reading all intermediate nodes between two adjacent ROADMs
-        each element within the list is being added an oms and oms_id to record the
-        oms it belongs to.
-        the function supports different spectrum width and supposes that the whole network
-        works with the min range among OMSs
+    """initialization of OMS list in the network
+
+    an oms is build reading all intermediate nodes between two adjacent ROADMs
+    each element within the list is being added an oms and oms_id to record the
+    oms it belongs to.
+    the function supports different spectrum width and supposes that the whole network
+    works with the min range among OMSs
    """
    oms_id = 0
    oms_list = []
@@ -296,8 +285,9 @@ def build_oms_list(network, equipment):


 def reversed_oms(oms_list):
-    """ identifies reversed OMS
-        only applicable for non parallel OMS
+    """identifies reversed OMS
+
+    only applicable for non parallel OMS
    """
    for oms in oms_list:
        has_reversed = False
@@ -322,28 +312,41 @@ def bitmap_sum(band1, band2):
    return res


-def spectrum_selection(pth, oms_list, requested_m, requested_n=None):
-    """Collects spectrum availability and call the select_candidate function"""
-
-    # use indexes instead of ITU-T n values
+def build_path_oms_id_list(pth):
    path_oms = []
    for elem in pth:
        if not isinstance(elem, Roadm) and not isinstance(elem, Transceiver):
            # only edfa, fused and fibers have oms_id attribute
            path_oms.append(elem.oms_id)
    # remove duplicate oms_id, order is not important
-    path_oms = list(set(path_oms))
-    # assuming all oms have same freq index
-    if not path_oms:
-        candidate = (None, None, None)
-        return candidate, path_oms
-    freq_index = oms_list[path_oms[0]].spectrum_bitmap.freq_index
-    freq_index_min = oms_list[path_oms[0]].spectrum_bitmap.freq_index_min
-    freq_index_max = oms_list[path_oms[0]].spectrum_bitmap.freq_index_max
+    return list(set(path_oms))

-    freq_availability = oms_list[path_oms[0]].spectrum_bitmap.bitmap
+
+def aggregate_oms_bitmap(path_oms, oms_list):
+    spectrum = oms_list[path_oms[0]].spectrum_bitmap
+    bitmap = spectrum.bitmap
+    # assuming all oms have same freq indices
    for oms in path_oms[1:]:
-        freq_availability = bitmap_sum(oms_list[oms].spectrum_bitmap.bitmap, freq_availability)
+        bitmap = bitmap_sum(oms_list[oms].spectrum_bitmap.bitmap, bitmap)
+    params = {
+        'oms_id': 0,
+        'el_id_list': 0,
+        'el_list': []
+    }
+    freq_min = nvalue_to_frequency(spectrum.freq_index_min)
+    freq_max = nvalue_to_frequency(spectrum.freq_index_max)
+    aggregate_oms = OMS(**params)
+    aggregate_oms.update_spectrum(freq_min, freq_max, grid=0.00625e12, existing_spectrum=bitmap)
+    return aggregate_oms
+
+
+def spectrum_selection(test_oms, requested_m, requested_n=None):
+    """Collects spectrum availability and call the select_candidate function"""
+    freq_index = test_oms.spectrum_bitmap.freq_index
+    freq_index_min = test_oms.spectrum_bitmap.freq_index_min
+    freq_index_max = test_oms.spectrum_bitmap.freq_index_max
+    freq_availability = test_oms.spectrum_bitmap.bitmap
+
    if requested_n is None:
        # avoid slots reserved on the edge 0.15e-12 on both sides -> 24
        candidates = [(freq_index[i] + requested_m, freq_index[i], freq_index[i] + 2 * requested_m - 1)
@@ -354,29 +357,36 @@ def spectrum_selection(pth, oms_list, requested_m, requested_n=None):

        candidate = select_candidate(candidates, policy='first_fit')
    else:
-        i = oms_list[path_oms[0]].spectrum_bitmap.geti(requested_n)
-        # print(f'N {requested_n} i {i}')
-        # print(freq_availability[i-m:i+m] )
-        # print(freq_index[i-m:i+m])
-        if (freq_availability[i - requested_m:i + requested_m] == [1] * (2 * requested_m) and
-                freq_index[i - requested_m] >= freq_index_min
+        i = test_oms.spectrum_bitmap.geti(requested_n)
+        if (freq_availability[i - requested_m:i + requested_m] == [1] * (2 * requested_m)
+                and freq_index[i - requested_m] >= freq_index_min
                and freq_index[i + requested_m - 1] <= freq_index_max):
            # candidate is the triplet center_n, startn and stopn
            candidate = (requested_n, requested_n - requested_m, requested_n + requested_m - 1)
        else:
            candidate = (None, None, None)
-        # print("coucou11")
-        # print(candidate)
-    # print(freq_availability[321:321+2*m])
-    # a = [i+321 for i in range(2*m)]
-    # print(a)
-    # print(candidate)
-    return candidate, path_oms
+    return candidate
+
+
+def determine_slot_numbers(test_oms, requested_n, required_m, per_channel_m):
+    """determines max availability around requested_n. requested_n should not be None"""
+    bitmap = test_oms.spectrum_bitmap
+    freq_index = bitmap.freq_index
+    freq_index_min = bitmap.freq_index_min
+    freq_index_max = bitmap.freq_index_max
+    freq_availability = bitmap.bitmap
+    center_i = bitmap.geti(requested_n)
+    i = per_channel_m
+    while (freq_availability[center_i - i:center_i + i] == [1] * (2 * i)
+           and freq_index[center_i - i] >= freq_index_min
+           and freq_index[center_i + i - 1] <= freq_index_max
+           and i <= required_m):
+        i += per_channel_m
+    return i - per_channel_m


 def select_candidate(candidates, policy):
-    """ selects a candidate among all available spectrum
-    """
+    """selects a candidate among all available spectrum"""
    if policy == 'first_fit':
        if candidates:
            return candidates[0]
@@ -386,44 +396,112 @@ def select_candidate(candidates, policy):
        raise ServiceError('Only first_fit spectrum assignment policy is implemented.')


+def compute_n_m(required_m, rq, path_oms, oms_list, per_channel_m, policy='first_fit'):
+    """ based on requested path_bandwidth fill in M=None values with uint values, using per_channel_m
+    and center frequency, with first fit strategy. The function checks the available spectrum but check
+    consistencies among M values of the request, but not with other requests.
+    For example, if request is for 32 slots corresponding to 8 x 4 slots of 32Gbauds channels,
+    the following frequency slots will result in the following assignment
+
+    N = 0, 8,    16, 32           -> 0,   8,   16,   32
+    M = 8, None, 8,  None         -> 8,   8,    8,    8
+
+    N = 0,    8,    16, 32        -> 0,   , 16
+    M = None, None, 8,  None      -> 24,  , 8
+    """
+    selected_m = []
+    selected_n = []
+    remaining_slots_to_serve = required_m
+    # order slots for the computation: assign biggest m first
+    rq_N, rq_M, order = order_slots([{'N': n, 'M': m} for n, m in zip(rq.N, rq.M)])
+    # Create an oms that represents current assignments of all oms listed in path_oms, and test N and M on it.
+    # If M is defined, checks that proposed N, M is free
+    test_oms = aggregate_oms_bitmap(path_oms, oms_list)
+    for n, m in zip(rq_N, rq_M):
+        if m is not None and n is not None:
+            # check availabilityfor this n, m
+            available_slots = determine_slot_numbers(test_oms, n, m, m)
+            if available_slots == 0:
+                # if n, m are not feasible, break at this point no have non zero remaining_slots_to_serve
+                # in order to blocks the request (even is other N,M where feasible)
+                break
+        elif m is not None and n is None:
+            # find a candidate n
+            n, _, _ = spectrum_selection(test_oms, m, None)
+            if n is None:
+                # if no n is feasible for the m, block the request
+                break
+        elif m is None and n is not None:
+            # find a feasible m for this n. If None is found, then block the request
+            m = determine_slot_numbers(test_oms, n, remaining_slots_to_serve, per_channel_m)
+            if m == 0 or remaining_slots_to_serve == 0:
+                break
+        else:
+            # if n and m are not defined, try to find a single  assignment to fits the remaining slots to serve
+            # (first fit strategy)
+            n, _, _ = spectrum_selection(test_oms, remaining_slots_to_serve, None)
+            if n is None or remaining_slots_to_serve == 0:
+                break
+            else:
+                m = remaining_slots_to_serve
+        selected_m.append(m)
+        selected_n.append(n)
+        test_oms.assign_spectrum(n, m)
+        remaining_slots_to_serve = remaining_slots_to_serve - m
+
+    # re-order selected_m and selected_n according to initial request N, M order, ignoring None values
+    not_selected = [None for i in range(len(rq_N) - len(selected_n))]
+    selected_m = restore_order(selected_m + not_selected, order)
+    selected_n = restore_order(selected_n + not_selected, order)
+    return selected_n, selected_m, remaining_slots_to_serve
+
+
 def pth_assign_spectrum(pths, rqs, oms_list, rpths):
-    """ basic first fit assignment
-        if reversed path are provided, means that occupation is bidir
+    """basic first fit assignment
+
+    if reversed path are provided, means that occupation is bidir
    """
    for pth, rq, rpth in zip(pths, rqs, rpths):
-        # computes the number of channels required
        if hasattr(rq, 'blocking_reason'):
            rq.N = None
            rq.M = None
        else:
-            nb_wl, requested_m = compute_spectrum_slot_vs_bandwidth(rq.path_bandwidth,
-                                                                    rq.spacing, rq.bit_rate)
-            if getattr(rq, 'M', None) is not None:
-                # Consistency check between the requested M and path_bandwidth
-                # M value should be bigger than the computed requested_m (simple estimate)
-                # TODO: elaborate a more accurate estimate with nb_wl * tx_osnr + possibly guardbands in case of
+            # computes the number of channels required for path_bandwidth and the min required nb of slots
+            # for one channel (corresponds to the spacing)
+            nb_wl, required_m = compute_spectrum_slot_vs_bandwidth(rq.path_bandwidth,
+                                                                   rq.spacing, rq.bit_rate)
+            _, per_channel_m = compute_spectrum_slot_vs_bandwidth(rq.bit_rate,
+                                                                  rq.spacing, rq.bit_rate)
+            # find oms ids that are concerned both by pth and rpth
+            path_oms = build_path_oms_id_list(pth + rpth)
+            if getattr(rq, 'M', None) is not None and all(rq.M):
+                # if all M are well defined: Consistency check that the requested M are enough to carry the nb_wl:
+                # check that the integer number of per_channel_m carried in each M value is enough to carry nb_wl.
+                # if not, blocks the demand
+                nb_channels_of_request = sum([m // per_channel_m for m in rq.M])
+                # TODO: elaborate a more accurate estimate with nb_wl * min_spacing + possibly guardbands in case of
                # superchannel closed packing.
-                if requested_m > rq.M:
+                if nb_wl > nb_channels_of_request:
                    rq.N = None
                    rq.M = None
                    rq.blocking_reason = 'NOT_ENOUGH_RESERVED_SPECTRUM'
-                    # need to stop here for this request and not go though spectrum selection process with requested_m
+                    # need to stop here for this request and not go though spectrum selection process
                    continue
-                # use the req.M even if requested_m is smaller
-                requested_m = rq.M
-            requested_n = getattr(rq, 'N', None)
-            (center_n, startn, stopn), path_oms = spectrum_selection(pth + rpth, oms_list, requested_m,
-                                                                     requested_n)
-            # if requested n and m concern already occupied spectrum the previous function returns a None candidate
-            # if not None, center_n and start, stop frequencies are applicable to all oms of pth
-            # checks that spectrum is not None else indicate blocking reason
-            if center_n is not None:
-                for oms_elem in path_oms:
-                    oms_list[oms_elem].assign_spectrum(center_n, requested_m)
-                    oms_list[oms_elem].add_service(rq.request_id, nb_wl)
-                rq.N = center_n
-                rq.M = requested_m
-            else:
+            # Use the req.M even if nb_wl and required_m are smaller.
+            # first fit strategy: assign as many lambda as possible in the None remaining N, M values
+            selected_n, selected_m, remaining_slots_to_serve = \
+                compute_n_m(required_m, rq, path_oms, oms_list, per_channel_m)
+            # if there are some remaining_slots_to_serve, this means that provided rq.M and rq.N values were
+            # not possible. Then do not go though spectrum assignment process and blocks the demand
+            if remaining_slots_to_serve > 0:
                rq.N = None
                rq.M = None
                rq.blocking_reason = 'NO_SPECTRUM'
+                continue
+            for oms_elem in path_oms:
+                for this_n, this_m in zip(selected_n, selected_m):
+                    if this_m is not None:
+                        oms_list[oms_elem].assign_spectrum(this_n, this_m)
+                oms_list[oms_elem].add_service(rq.request_id, nb_wl)
+            rq.N = selected_n
+            rq.M = selected_m
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,11 @@
-matplotlib>=3.5.1,<4
-networkx>=2.6,<3
-numpy>=1.22.0,<2
-pandas>=1.3.5,<2
-pbr>=5.7.0,<6
-scipy>=1.7.3,<2
+# matplotlib 3.8 removed support for Python 3.8
+matplotlib>=3.7.3,<4
+# networkx 3.2 removed support for Python 3.8
+networkx>=3.1,<4
+# numpy 1.25 removed support for Python 3.8
+numpy>=1.24.4,<2
+pbr>=6.0.0,<7
+# scipy 1.11 removed support for Python 3.8
+scipy>=1.10.1,<2
+# xlrd 2.x removed support for .xlsx, it's only .xls now
 xlrd>=1.2.0,<2
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@ name = gnpy
 description-file = README.md
 description-content-type = text/markdown; variant=GFM
 author = Telecom Infra Project
-author-email = jan.kundrat@telecominfraproject.com
+author-email = jkt@jankundrat.com
 license = BSD-3-Clause
 home-page = https://github.com/Telecominfraproject/oopt-gnpy
 project_urls =
@@ -22,6 +22,8 @@ classifier =
    Programming Language :: Python :: 3.8
    Programming Language :: Python :: 3.9
    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
    Programming Language :: Python :: Implementation :: CPython
    Topic :: Scientific/Engineering
    Topic :: Scientific/Engineering :: Physics
--- a/tests/data/CORONET_services.json
+++ b/tests/data/CORONET_services.json
@@ -0,0 +1,21 @@
+{
+  "path-request": [
+    {
+      "request-id": "0",
+      "source": "trx Abilene",
+      "destination": "trx Albany",
+      "src-tp-id": "trx Abilene",
+      "dst-tp-id": "trx Albany",
+      "bidirectional": false,
+      "path-constraints": {
+        "te-bandwidth": {
+          "technology": "flexi-grid",
+          "trx_type": "Voyager",
+          "trx_mode": "mode 3",
+          "spacing": 62500000000.0,
+          "path_bandwidth": 100000000000.0
+        }
+      }
+    }
+  ]
+}
--- a/tests/data/eqpt_config.json
+++ b/tests/data/eqpt_config.json
@@ -217,7 +217,7 @@
                       "tx_osnr": 45,
                       "min_spacing": 75e9,
                       "cost":1
-                       },                       
+                       },
                       {
                       "format": "mode 4",
                       "baud_rate": 66e9,
--- a/tests/data/testTopology_response.json
+++ b/tests/data/testTopology_response.json
--- a/tests/data/testTopology_response_expected.csv
+++ b/tests/data/testTopology_response_expected.csv
@@ -1,7 +1,7 @@
 response-id,source,destination,path_bandwidth,Pass?,nb of tsp pairs,total cost,transponder-type,transponder-mode,OSNR-0.1nm,SNR-0.1nm,SNR-bandwidth,baud rate (Gbaud),input power (dBm),path,"spectrum (N,M)",reversed path OSNR-0.1nm,reversed path SNR-0.1nm,reversed path SNR-bandwidth
-0,trx Lorient_KMA,trx Vannes_KBE,100.0,True,1,1,Voyager,mode 1,30.84,30.84,26.75,32.0,0.0,trx Lorient_KMA | roadm Lorient_KMA | east edfa in Lorient_KMA to Vannes_KBE | fiber (Lorient_KMA → Vannes_KBE)-F055 | west edfa in Vannes_KBE to Lorient_KMA | roadm Vannes_KBE | trx Vannes_KBE,"-284, 4",,,
-1,trx Brest_KLA,trx Vannes_KBE,10.0,True,1,1,Voyager,mode 1,22.65,22.11,18.03,32.0,1.0,trx Brest_KLA | roadm Brest_KLA | east edfa in Brest_KLA to Morlaix | fiber (Brest_KLA → Morlaix)-F060 | east fused spans in Morlaix | fiber (Morlaix → Lannion_CAS)-F059 | west edfa in Lannion_CAS to Morlaix | roadm Lannion_CAS | east edfa in Lannion_CAS to Corlay | fiber (Lannion_CAS → Corlay)-F061 | west fused spans in Corlay | fiber (Corlay → Loudeac)-F010 | west fused spans in Loudeac | fiber (Loudeac → Lorient_KMA)-F054 | west edfa in Lorient_KMA to Loudeac | roadm Lorient_KMA | east edfa in Lorient_KMA to Vannes_KBE | fiber (Lorient_KMA → Vannes_KBE)-F055 | west edfa in Vannes_KBE to Lorient_KMA | roadm Vannes_KBE | trx Vannes_KBE,"-276, 4",,,
-3,trx Lannion_CAS,trx Rennes_STA,60.0,True,1,1,vendorA_trx-type1,mode 1,28.29,25.85,21.77,32.0,1.0,trx Lannion_CAS | roadm Lannion_CAS | east edfa in Lannion_CAS to Stbrieuc | fiber (Lannion_CAS → Stbrieuc)-F056 | east edfa in Stbrieuc to Rennes_STA | fiber (Stbrieuc → Rennes_STA)-F057 | west edfa in Rennes_STA to Stbrieuc | roadm Rennes_STA | trx Rennes_STA,"-284, 4",,,
-4,trx Rennes_STA,trx Lannion_CAS,150.0,True,1,1,vendorA_trx-type1,mode 2,22.27,22.15,15.05,64.0,0.0,trx Rennes_STA | roadm Rennes_STA | east edfa in Rennes_STA to Ploermel | fiber (Rennes_STA → Ploermel)- | east edfa in Ploermel to Vannes_KBE | fiber (Ploermel → Vannes_KBE)- | west edfa in Vannes_KBE to Ploermel | roadm Vannes_KBE | east edfa in Vannes_KBE to Lorient_KMA | fiber (Vannes_KBE → Lorient_KMA)-F055 | west edfa in Lorient_KMA to Vannes_KBE | roadm Lorient_KMA | east edfa in Lorient_KMA to Loudeac | fiber (Lorient_KMA → Loudeac)-F054 | east fused spans in Loudeac | fiber (Loudeac → Corlay)-F010 | east fused spans in Corlay | fiber (Corlay → Lannion_CAS)-F061 | west edfa in Lannion_CAS to Corlay | roadm Lannion_CAS | trx Lannion_CAS,"-266, 6",,,
-5,trx Rennes_STA,trx Lannion_CAS,20.0,True,1,1,vendorA_trx-type1,mode 2,30.79,28.78,21.68,64.0,3.0,trx Rennes_STA | roadm Rennes_STA | east edfa in Rennes_STA to Stbrieuc | fiber (Rennes_STA → Stbrieuc)-F057 | west edfa in Stbrieuc to Rennes_STA | fiber (Stbrieuc → Lannion_CAS)-F056 | west edfa in Lannion_CAS to Stbrieuc | roadm Lannion_CAS | trx Lannion_CAS,"-274, 6",,,
+0,trx Lorient_KMA,trx Vannes_KBE,100.0,True,1,1,Voyager,mode 1,30.84,30.84,26.75,32.0,0.0,trx Lorient_KMA | roadm Lorient_KMA | east edfa in Lorient_KMA to Vannes_KBE | fiber (Lorient_KMA → Vannes_KBE)-F055 | west edfa in Vannes_KBE to Lorient_KMA | roadm Vannes_KBE | trx Vannes_KBE,"[-284], [4]",,,
+1,trx Brest_KLA,trx Vannes_KBE,10.0,True,1,1,Voyager,mode 1,22.65,22.11,18.03,32.0,1.0,trx Brest_KLA | roadm Brest_KLA | east edfa in Brest_KLA to Morlaix | fiber (Brest_KLA → Morlaix)-F060 | east fused spans in Morlaix | fiber (Morlaix → Lannion_CAS)-F059 | west edfa in Lannion_CAS to Morlaix | roadm Lannion_CAS | east edfa in Lannion_CAS to Corlay | fiber (Lannion_CAS → Corlay)-F061 | west fused spans in Corlay | fiber (Corlay → Loudeac)-F010 | west fused spans in Loudeac | fiber (Loudeac → Lorient_KMA)-F054 | west edfa in Lorient_KMA to Loudeac | roadm Lorient_KMA | east edfa in Lorient_KMA to Vannes_KBE | fiber (Lorient_KMA → Vannes_KBE)-F055 | west edfa in Vannes_KBE to Lorient_KMA | roadm Vannes_KBE | trx Vannes_KBE,"[-276], [4]",,,
+3,trx Lannion_CAS,trx Rennes_STA,60.0,True,1,1,vendorA_trx-type1,mode 1,28.29,25.85,21.77,32.0,1.0,trx Lannion_CAS | roadm Lannion_CAS | east edfa in Lannion_CAS to Stbrieuc | fiber (Lannion_CAS → Stbrieuc)-F056 | east edfa in Stbrieuc to Rennes_STA | fiber (Stbrieuc → Rennes_STA)-F057 | west edfa in Rennes_STA to Stbrieuc | roadm Rennes_STA | trx Rennes_STA,"[-284], [4]",,,
+4,trx Rennes_STA,trx Lannion_CAS,150.0,True,1,1,vendorA_trx-type1,mode 2,22.27,22.14,15.05,64.0,0.0,trx Rennes_STA | roadm Rennes_STA | east edfa in Rennes_STA to Ploermel | fiber (Rennes_STA → Ploermel)- | east edfa in Ploermel to Vannes_KBE | fiber (Ploermel → Vannes_KBE)- | west edfa in Vannes_KBE to Ploermel | roadm Vannes_KBE | east edfa in Vannes_KBE to Lorient_KMA | fiber (Vannes_KBE → Lorient_KMA)-F055 | west edfa in Lorient_KMA to Vannes_KBE | roadm Lorient_KMA | east edfa in Lorient_KMA to Loudeac | fiber (Lorient_KMA → Loudeac)-F054 | east fused spans in Loudeac | fiber (Loudeac → Corlay)-F010 | east fused spans in Corlay | fiber (Corlay → Lannion_CAS)-F061 | west edfa in Lannion_CAS to Corlay | roadm Lannion_CAS | trx Lannion_CAS,"[-266], [6]",,,
+5,trx Rennes_STA,trx Lannion_CAS,20.0,True,1,1,vendorA_trx-type1,mode 2,30.79,28.76,21.67,64.0,3.0,trx Rennes_STA | roadm Rennes_STA | east edfa in Rennes_STA to Stbrieuc | fiber (Rennes_STA → Stbrieuc)-F057 | west edfa in Stbrieuc to Rennes_STA | fiber (Stbrieuc → Lannion_CAS)-F056 | west edfa in Lannion_CAS to Stbrieuc | roadm Lannion_CAS | trx Lannion_CAS,"[-274], [6]",,,
 6,,,,NO_PATH,,,,,,,,,,,,,,
--- a/tests/data/test_fiber_fix_expected_results.csv
+++ b/tests/data/test_fiber_fix_expected_results.csv
@@ -1,97 +1,97 @@
 signal,nli
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--- a/tests/data/test_fiber_flex_expected_results.csv
+++ b/tests/data/test_fiber_flex_expected_results.csv
@@ -1,6 +1,6 @@
 signal,nli
-1.9952623149688793e-05,5.522326183599433e-09
-1.7957360834719913e-05,4.5606601423111315e-09
-2.593841009459543e-05,6.633717697038881e-09
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+1.5962098519751036e-05,4.082332034495425e-09
+2.3943147779626556e-05,7.857762167195498e-09
--- a/tests/data/test_long_network.json
+++ b/tests/data/test_long_network.json
@@ -0,0 +1,809 @@
+{
+    "network_name": "Example Network - long path",
+    "elements": [{
+            "uid": "Site_A",
+            "type": "Transceiver",
+            "metadata": {
+                "location": {
+                    "city": "Site A",
+                    "region": "",
+                    "latitude": 0,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+          "uid": "roadm Site A",
+          "metadata": {
+            "location": {
+              "city": "Site A",
+              "region": "RLD",
+              "latitude": 0.0,
+              "longitude": 0.0
+            }
+          },
+          "type": "Roadm"
+        },
+        {
+            "uid": "booster A",
+            "type": "Edfa",
+            "type_variety": "std_medium_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 0,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span1",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa1",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span2",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa2",
+            "type": "Edfa",
+            "type_variety": "test_fixed_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span3",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa3",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span4",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
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+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
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+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa4",
+            "type": "Edfa",
+            "type_variety": "test_fixed_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span5",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa5",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+          "uid": "roadm Site C",
+          "metadata": {
+            "location": {
+              "city": "Site A",
+              "region": "RLD",
+              "latitude": 0.0,
+              "longitude": 0.0
+            }
+          },
+          "type": "Roadm"
+        },
+        {
+            "uid": "booster C",
+            "type": "Edfa",
+            "type_variety": "std_medium_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 0,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span6",
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+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
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+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa6",
+            "type": "Edfa",
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+            "operational": {
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+                "tilt_target": 0
+            },
+            "metadata": {
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+                }
+            }
+        },
+        {
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+            "params": {
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+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
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+            }
+        },
+        {
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+                "tilt_target": 0
+            },
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+            }
+        },
+        {
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+            "type_variety": "SSMF",
+            "params": {
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+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
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+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa8",
+            "type": "Edfa",
+            "type_variety": "test_fixed_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span9",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa9",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span10",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa10",
+            "type": "Edfa",
+            "type_variety": "test_fixed_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+          "uid": "roadm Site D",
+          "metadata": {
+            "location": {
+              "city": "Site A",
+              "region": "RLD",
+              "latitude": 0.0,
+              "longitude": 0.0
+            }
+          },
+          "type": "Roadm"
+        },
+        {
+            "uid": "booster D",
+            "type": "Edfa",
+            "type_variety": "std_medium_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 0,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span11",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
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+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa11",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span12",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
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+                    "latitude": 1,
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+                }
+            }
+        },
+        {
+            "uid": "Edfa12",
+            "type": "Edfa",
+            "type_variety": "test_fixed_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 2,
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+                }
+            }
+        },
+        {
+          "uid": "roadm Site E",
+          "metadata": {
+            "location": {
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+              "region": "RLD",
+              "latitude": 0.0,
+              "longitude": 0.0
+            }
+          },
+          "type": "Roadm"
+        },
+        {
+            "uid": "booster E",
+            "type": "Edfa",
+            "type_variety": "std_medium_gain",
+            "operational": {
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+                "tilt_target": 0
+            },
+            "metadata": {
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+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span13",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
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+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa13",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
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+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span14",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
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+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
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+                    "latitude": 1,
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+                }
+            }
+        },
+        {
+            "uid": "Edfa14",
+            "type": "Edfa",
+            "type_variety": "test_fixed_gain",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Span15",
+            "type": "Fiber",
+            "type_variety": "SSMF",
+            "params": {
+                "length": 80,
+                "loss_coef": 0.2,
+                "length_units": "km"
+                },
+            "metadata": {
+                "location": {
+                    "region": "",
+                    "latitude": 1,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+            "uid": "Edfa15",
+            "type": "Edfa",
+            "type_variety": "test",
+            "operational": {
+                "gain_target": 16,
+                "tilt_target": 0
+            },
+            "metadata": {
+                "location": {
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+                    "latitude": 2,
+                    "longitude": 0
+                }
+            }
+        },
+        {
+          "uid": "roadm Site B",
+          "metadata": {
+            "location": {
+              "city": "Site B",
+              "region": "RLD",
+              "latitude": 0.0,
+              "longitude": 0.0
+            }
+          },
+          "type": "Roadm"
+        },
+        {
+            "uid": "Site_B",
+            "type": "Transceiver",
+            "metadata": {
+                "location": {
+                    "city": "Site B",
+                    "region": "",
+                    "latitude": 3,
+                    "longitude": 0
+                }
+            }
+        }
+
+    ],
+    "connections": [{
+            "from_node": "Site_A",
+            "to_node": "roadm Site A"
+        },
+        {
+            "from_node": "roadm Site A",
+            "to_node": "booster A"
+        },
+        {
+            "from_node": "booster A",
+            "to_node": "Span1"
+        },
+        {
+            "from_node": "Span1",
+            "to_node": "Edfa1"
+        },
+        {
+            "from_node": "Edfa1",
+            "to_node": "Span2"
+        },
+        {
+            "from_node": "Span2",
+            "to_node": "Edfa2"
+        },       
+        {
+            "from_node": "Edfa2",
+            "to_node": "Span3"
+        },
+        {
+            "from_node": "Span3",
+            "to_node": "Edfa3"
+        },       
+        {
+            "from_node": "Edfa3",
+            "to_node": "Span4"
+        },
+        {
+            "from_node": "Span4",
+            "to_node": "Edfa4"
+        },       
+        {
+            "from_node": "Edfa4",
+            "to_node": "Span5"
+        },
+        {
+            "from_node": "Span5",
+            "to_node": "Edfa5"
+        },       
+        {
+            "from_node": "Edfa5",
+            "to_node": "roadm Site C"
+        },
+        {
+            "from_node": "roadm Site C",
+            "to_node": "booster C"
+        },
+        {
+            "from_node": "booster C",
+            "to_node": "Span6"
+        },
+        {
+            "from_node": "Span6",
+            "to_node": "Edfa6"
+        },
+        {
+            "from_node": "Edfa6",
+            "to_node": "Span7"
+        },
+        {
+            "from_node": "Span7",
+            "to_node": "Edfa7"
+        },       
+        {
+            "from_node": "Edfa7",
+            "to_node": "Span8"
+        },
+        {
+            "from_node": "Span8",
+            "to_node": "Edfa8"
+        },       
+        {
+            "from_node": "Edfa8",
+            "to_node": "Span9"
+        },
+        {
+            "from_node": "Span9",
+            "to_node": "Edfa9"
+        },       
+        {
+            "from_node": "Edfa9",
+            "to_node": "Span10"
+        },
+        {
+            "from_node": "Span10",
+            "to_node": "Edfa10"
+        },       
+        {
+            "from_node": "Edfa10",
+            "to_node": "roadm Site D"
+        },
+        {
+            "from_node": "roadm Site D",
+            "to_node": "booster D"
+        },
+        {
+            "from_node": "booster D",
+            "to_node": "Span11"
+        },
+        {
+            "from_node": "Span11",
+            "to_node": "Edfa11"
+        },
+        {
+            "from_node": "Edfa11",
+            "to_node": "Span12"
+        },
+        {
+            "from_node": "Span12",
+            "to_node": "Edfa12"
+        },       
+        {
+            "from_node": "Edfa12",
+            "to_node": "roadm Site E"
+        },
+        {
+            "from_node": "roadm Site E",
+            "to_node": "booster E"
+        },
+        {
+            "from_node": "booster E",
+            "to_node": "Span13"
+        },
+        {
+            "from_node": "Span13",
+            "to_node": "Edfa13"
+        },       
+        {
+            "from_node": "Edfa13",
+            "to_node": "Span14"
+        },
+        {
+            "from_node": "Span14",
+            "to_node": "Edfa14"
+        },       
+        {
+            "from_node": "Edfa14",
+            "to_node": "Span15"
+        },
+        {
+            "from_node": "Span15",
+            "to_node": "Edfa15"
+        },       
+        {
+            "from_node": "Edfa15",
+            "to_node": "roadm Site B"
+        },
+        {
+            "from_node": "roadm Site B",
+            "to_node": "Site_B"
+        }
+    ]
+}
--- a/tests/data/test_lumped_losses_fiber_no_pumps.csv
+++ b/tests/data/test_lumped_losses_fiber_no_pumps.csv
@@ -1,96 +1,96 @@
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--- a/tests/data/test_old_parameters_fiber_config.json
+++ b/tests/data/test_old_parameters_fiber_config.json
@@ -0,0 +1,224 @@
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--- a/tests/data/test_parameters_fiber_config.json
+++ b/tests/data/test_parameters_fiber_config.json
@@ -0,0 +1,225 @@
+{
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--- a/tests/data/test_raman_fiber_expected_results.csv
+++ b/tests/data/test_raman_fiber_expected_results.csv
@@ -1,97 +1,97 @@
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--- a/tests/data/wrong_duplicate_eqpt_ila_reverse.xlsx
+++ b/tests/data/wrong_duplicate_eqpt_ila_reverse.xlsx
--- a/tests/data/wrong_duplicate_link_reverse.xlsx
+++ b/tests/data/wrong_duplicate_link_reverse.xlsx
--- a/tests/data/wrong_node_type.xlsx
+++ b/tests/data/wrong_node_type.xlsx
--- a/tests/data/wrong_service.xlsx
+++ b/tests/data/wrong_service.xlsx
--- a/tests/data/wrong_service_type.xlsx
+++ b/tests/data/wrong_service_type.xlsx
--- a/tests/data/wrong_topo_bad_eqpt.xlsx
+++ b/tests/data/wrong_topo_bad_eqpt.xlsx
--- a/tests/data/wrong_topo_duplicate_eqpt.xlsx
+++ b/tests/data/wrong_topo_duplicate_eqpt.xlsx
--- a/tests/data/wrong_topo_duplicate_node.xlsx
+++ b/tests/data/wrong_topo_duplicate_node.xlsx
--- a/tests/data/wrong_topo_eqpt.xlsx
+++ b/tests/data/wrong_topo_eqpt.xlsx
--- a/tests/data/wrong_topo_link.xlsx
+++ b/tests/data/wrong_topo_link.xlsx
--- a/tests/data/wrong_topo_link_header.xlsx
+++ b/tests/data/wrong_topo_link_header.xlsx
--- a/tests/data/wrong_topo_node.xlsx
+++ b/tests/data/wrong_topo_node.xlsx
--- a/tests/invocation/logs_path_request
+++ b/tests/invocation/logs_path_request
@@ -0,0 +1,37 @@
+INFO     gnpy.tools.cli_examples:cli_examples.py Computing path requests meshTopologyExampleV2.xls into JSON format
+INFO     gnpy.tools.json_io:json_io.py Automatically converting requests from XLS to JSON
+INFO     gnpy.topology.request:request.py 
+	request 0
+	Computing path from trx Lorient_KMA to trx Vannes_KBE
+	with path constraint: ['trx Lorient_KMA', 'trx Vannes_KBE']
+	Computed path (roadms):['roadm Lorient_KMA', 'roadm Vannes_KBE']
+INFO     gnpy.topology.request:request.py 
+	request 1
+	Computing path from trx Brest_KLA to trx Vannes_KBE
+	with path constraint: ['trx Brest_KLA', 'roadm Brest_KLA', 'roadm Lannion_CAS', 'roadm Lorient_KMA', 'roadm Vannes_KBE', 'trx Vannes_KBE']
+	Computed path (roadms):['roadm Brest_KLA', 'roadm Lannion_CAS', 'roadm Lorient_KMA', 'roadm Vannes_KBE']
+INFO     gnpy.topology.request:request.py 
+	request 3
+	Computing path from trx Lannion_CAS to trx Rennes_STA
+	with path constraint: ['trx Lannion_CAS', 'trx Rennes_STA']
+	Computed path (roadms):['roadm Lannion_CAS', 'roadm Rennes_STA']
+INFO     gnpy.topology.request:request.py 
+	request 4
+	Computing path from trx Rennes_STA to trx Lannion_CAS
+	with path constraint: ['trx Rennes_STA', 'trx Lannion_CAS']
+	Computed path (roadms):['roadm Rennes_STA', 'roadm Vannes_KBE', 'roadm Lorient_KMA', 'roadm Lannion_CAS']
+INFO     gnpy.topology.request:request.py 
+	request 5
+	Computing path from trx Rennes_STA to trx Lannion_CAS
+	with path constraint: ['trx Rennes_STA', 'trx Lannion_CAS']
+	Computed path (roadms):['roadm Rennes_STA', 'roadm Lannion_CAS']
+INFO     gnpy.topology.request:request.py 
+	request 7 | 6
+	Computing path from trx Lannion_CAS to trx Lorient_KMA
+	with path constraint: ['trx Lannion_CAS', 'trx Lorient_KMA']
+	Computed path (roadms):['roadm Lannion_CAS', 'roadm Lorient_KMA']
+INFO     gnpy.topology.request:request.py 
+	request 7b
+	Computing path from trx Lannion_CAS to trx Lorient_KMA
+	with path constraint: ['trx Lannion_CAS', 'trx Lorient_KMA']
+	Computed path (roadms):['roadm Lannion_CAS', 'roadm Lorient_KMA']
--- a/tests/invocation/logs_path_requests_run_CD_PMD_PDL_missing
+++ b/tests/invocation/logs_path_requests_run_CD_PMD_PDL_missing
@@ -0,0 +1,13 @@
+INFO     gnpy.tools.cli_examples:cli_examples.py Computing path requests CORONET_services.json into JSON format
+INFO     gnpy.topology.request:request.py 
+	request 0
+	Computing path from trx Abilene to trx Albany
+	with path constraint: ['trx Abilene', 'trx Albany']
+	Computed path (roadms):['roadm Abilene', 'roadm Dallas', 'roadm Little_Rock', 'roadm Memphis', 'roadm Nashville', 'roadm Louisville', 'roadm Cincinnati', 'roadm Columbus', 'roadm Cleveland', 'roadm Buffalo', 'roadm Rochester', 'roadm Syracuse', 'roadm Albany']
+WARNING  gnpy.topology.request:request.py 	Warning! Request 0 computed path from trx Abilene to trx Albany does not pass with mode 3
+	computed SNR in 0.1nm = 14.44
+	PDL penalty not evaluated
+	CD penalty not evaluated
+	PMD penalty not evaluated
+	required osnr = 18
+	system margin = 2
--- a/tests/invocation/logs_transmission_saturated
+++ b/tests/invocation/logs_transmission_saturated
@@ -0,0 +1,307 @@
+INFO     gnpy.tools.cli_examples:cli_examples.py source = 'lannion'
+INFO     gnpy.tools.cli_examples:cli_examples.py destination = 'lorient'
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Lorient_KMA to Loudeac
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: effective gain in Node east edfa in Lannion_CAS to Stbrieuc
+	is above user specified amplifier std_low_gain
+	max flat gain: 16dB ; required gain: 23.0dB. Please check amplifier type.
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Rennes_STA to Stbrieuc
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: effective gain in Node east edfa in Lannion_CAS to Morlaix
+	is above user specified amplifier std_low_gain
+	max flat gain: 16dB ; required gain: 23.5dB. Please check amplifier type.
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Brest_KLA to Morlaix
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Lorient_KMA to Loudeac
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: effective gain in Node west edfa in Lannion_CAS to Corlay
+	is above user specified amplifier test
+	max flat gain: 25dB ; required gain: 29.82dB. Please check amplifier type.
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Lorient_KMA to Vannes_KBE
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Vannes_KBE to Lorient_KMA
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Lorient_KMA to Quimper
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Quimper to Lorient_KMA
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Brest_KLA to Quimper
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Vannes_KBE to Lorient_KMA
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Lorient_KMA to Vannes_KBE
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Vannes_KBE to Ploermel
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Ploermel to Vannes_KBE
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Rennes_STA to Ploermel
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Rennes_STA to Stbrieuc
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Stbrieuc to Rennes_STA
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Lannion_CAS to Stbrieuc
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Rennes_STA to Ploermel
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Vannes_KBE to Ploermel
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Brest_KLA to Morlaix
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: effective gain in Node east edfa in Brest_KLA to Quimper
+	is above user specified amplifier std_low_gain
+	max flat gain: 16dB ; required gain: 23.0dB. Please check amplifier type.
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in Quimper to Lorient_KMA
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in Lorient_KMA to Quimper
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in a to b
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in b to a
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in a to c
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in c to a
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in b to a
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in a to b
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in b to f
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in f to b
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in c to a
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in a to c
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in d to c
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in c to f
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in f to c
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in d to c
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in c to d
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in d to e
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in e to d
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in e to d
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in d to e
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in e to g
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in g to e
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in f to c
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in c to f
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in f to b
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in b to f
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in f to h
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in h to f
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in g to e
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in e to g
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in g to h
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in h to g
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in h to f
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in f to h
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node east edfa in h to g
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
+WARNING  gnpy.core.network:network.py 
+	WARNING: target gain and power in node west edfa in g to h
+	is beyond all available amplifiers capabilities and/or extended_gain_range:
+	a power reduction of -1.82 is applied
+
--- a/tests/invocation/openroadm-v4-Stockholm-Gothenburg
+++ b/tests/invocation/openroadm-v4-Stockholm-Gothenburg
@@ -15,9 +15,11 @@ Transceiver trx_Stockholm
  CD (ps/nm):                0.00
  PMD (ps):                  0.00
  PDL (dB):                  0.00
+  Latency (ms):              0.00
 Roadm roadm_Stockholm
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Stockholm_to_fiber (Stockholm → Norrköping)_(1/2)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -30,6 +32,7 @@ Edfa Edfa_booster_roadm_Stockholm_to_fiber (Stockholm → Norrköping)_(1/2)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Stockholm → Norrköping)_(1/2)
  type_variety:                SSMF
@@ -38,7 +41,8 @@ Fiber          fiber (Stockholm → Norrköping)_(1/2)
  total loss (dB):             16.33
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -14.33
+  reference pch out (dBm):     -14.33
+  actual pch out (dBm):        -14.31
 Edfa Edfa_fiber (Stockholm → Norrköping)_(1/2)
  type_variety:           openroadm_ila_low_noise
  effective gain(dB):     16.33
@@ -51,6 +55,7 @@ Edfa Edfa_fiber (Stockholm → Norrköping)_(1/2)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.02
  output VOA (dB):        0.00
 Fiber          fiber (Stockholm → Norrköping)_(2/2)
  type_variety:                SSMF
@@ -59,7 +64,8 @@ Fiber          fiber (Stockholm → Norrköping)_(2/2)
  total loss (dB):             16.33
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -14.33
+  reference pch out (dBm):     -14.33
+  actual pch out (dBm):        -14.29
 Edfa Edfa_preamp_roadm_Norrköping_from_fiber (Stockholm → Norrköping)_(2/2)
  type_variety:           openroadm_mw_mw_preamp
  effective gain(dB):     16.33
@@ -72,10 +78,12 @@ Edfa Edfa_preamp_roadm_Norrköping_from_fiber (Stockholm → Norrköping)_(2/2)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.04
  output VOA (dB):        0.00
 Roadm roadm_Norrköping
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Norrköping_to_fiber (Norrköping → Linköping)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -88,6 +96,7 @@ Edfa Edfa_booster_roadm_Norrköping_to_fiber (Norrköping → Linköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Norrköping → Linköping)
  type_variety:                SSMF
@@ -96,7 +105,8 @@ Fiber          fiber (Norrköping → Linköping)
  total loss (dB):             11.00
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -9.00
+  reference pch out (dBm):     -9.00
+  actual pch out (dBm):        -9.00
 Edfa Edfa_preamp_roadm_Linköping_from_fiber (Norrköping → Linköping)
  type_variety:           openroadm_mw_mw_preamp
  effective gain(dB):     11.00
@@ -109,10 +119,12 @@ Edfa Edfa_preamp_roadm_Linköping_from_fiber (Norrköping → Linköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.01
  output VOA (dB):        0.00
 Roadm roadm_Linköping
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Linköping_to_fiber (Linköping → Jönköping)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -125,6 +137,7 @@ Edfa Edfa_booster_roadm_Linköping_to_fiber (Linköping → Jönköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Linköping → Jönköping)
  type_variety:                SSMF
@@ -133,7 +146,8 @@ Fiber          fiber (Linköping → Jönköping)
  total loss (dB):             26.80
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -24.80
+  reference pch out (dBm):     -24.80
+  actual pch out (dBm):        -24.79
 Edfa Edfa_preamp_roadm_Jönköping_from_fiber (Linköping → Jönköping)
  type_variety:           openroadm_mw_mw_preamp
  effective gain(dB):     26.80
@@ -146,10 +160,12 @@ Edfa Edfa_preamp_roadm_Jönköping_from_fiber (Linköping → Jönköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.04
  output VOA (dB):        0.00
 Roadm roadm_Jönköping
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Jönköping_to_fiber (Jönköping → Borås)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -162,6 +178,7 @@ Edfa Edfa_booster_roadm_Jönköping_to_fiber (Jönköping → Borås)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Jönköping → Borås)
  type_variety:                SSMF
@@ -170,7 +187,8 @@ Fiber          fiber (Jönköping → Borås)
  total loss (dB):             17.82
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -15.82
+  reference pch out (dBm):     -15.82
+  actual pch out (dBm):        -15.81
 Edfa Edfa_preamp_roadm_Borås_from_fiber (Jönköping → Borås)
  type_variety:           openroadm_mw_mw_preamp
  effective gain(dB):     17.82
@@ -183,10 +201,12 @@ Edfa Edfa_preamp_roadm_Borås_from_fiber (Jönköping → Borås)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.02
  output VOA (dB):        0.00
 Roadm roadm_Borås
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Borås_to_fiber (Borås → Gothenburg)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -199,6 +219,7 @@ Edfa Edfa_booster_roadm_Borås_to_fiber (Borås → Gothenburg)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Borås → Gothenburg)
  type_variety:                SSMF
@@ -207,7 +228,8 @@ Fiber          fiber (Borås → Gothenburg)
  total loss (dB):             13.53
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -11.53
+  reference pch out (dBm):     -11.53
+  actual pch out (dBm):        -11.52
 Edfa Edfa_preamp_roadm_Gothenburg_from_fiber (Borås → Gothenburg)
  type_variety:           openroadm_mw_mw_preamp
  effective gain(dB):     13.53
@@ -220,21 +242,24 @@ Edfa Edfa_preamp_roadm_Gothenburg_from_fiber (Borås → Gothenburg)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.02
  output VOA (dB):        0.00
 Roadm roadm_Gothenburg
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Transceiver trx_Gothenburg
-  GSNR (0.1nm, dB):          18.90
-  GSNR (signal bw, dB):      14.88
+  GSNR (0.1nm, dB):          18.89
+  GSNR (signal bw, dB):      14.86
  OSNR ASE (0.1nm, dB):      21.20
  OSNR ASE (signal bw, dB):  17.18
  CD (ps/nm):                8350.42
  PMD (ps):                  7.99
  PDL (dB):                  3.74
+  Latency (ms):              2.45

 Transmission result for input power = 2.00 dBm:
-  Final GSNR (0.1 nm): [1;36;40m18.90 dB[0m
+  Final GSNR (0.1 nm): [1;36;40m18.89 dB[0m

 (No source node specified: picked trx_Stockholm)

--- a/tests/invocation/openroadm-v5-Stockholm-Gothenburg
+++ b/tests/invocation/openroadm-v5-Stockholm-Gothenburg
@@ -15,9 +15,11 @@ Transceiver trx_Stockholm
  CD (ps/nm):                0.00
  PMD (ps):                  0.00
  PDL (dB):                  0.00
+  Latency (ms):              0.00
 Roadm roadm_Stockholm
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Stockholm_to_fiber (Stockholm → Norrköping)_(1/2)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -30,6 +32,7 @@ Edfa Edfa_booster_roadm_Stockholm_to_fiber (Stockholm → Norrköping)_(1/2)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Stockholm → Norrköping)_(1/2)
  type_variety:                SSMF
@@ -38,7 +41,8 @@ Fiber          fiber (Stockholm → Norrköping)_(1/2)
  total loss (dB):             16.33
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -14.33
+  reference pch out (dBm):     -14.33
+  actual pch out (dBm):        -14.31
 Edfa Edfa_fiber (Stockholm → Norrköping)_(1/2)
  type_variety:           openroadm_ila_low_noise
  effective gain(dB):     16.33
@@ -51,6 +55,7 @@ Edfa Edfa_fiber (Stockholm → Norrköping)_(1/2)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.02
  output VOA (dB):        0.00
 Fiber          fiber (Stockholm → Norrköping)_(2/2)
  type_variety:                SSMF
@@ -59,7 +64,8 @@ Fiber          fiber (Stockholm → Norrköping)_(2/2)
  total loss (dB):             16.33
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -14.33
+  reference pch out (dBm):     -14.33
+  actual pch out (dBm):        -14.29
 Edfa Edfa_preamp_roadm_Norrköping_from_fiber (Stockholm → Norrköping)_(2/2)
  type_variety:           openroadm_mw_mw_preamp_worstcase_ver5
  effective gain(dB):     16.33
@@ -72,10 +78,12 @@ Edfa Edfa_preamp_roadm_Norrköping_from_fiber (Stockholm → Norrköping)_(2/2)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.04
  output VOA (dB):        0.00
 Roadm roadm_Norrköping
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Norrköping_to_fiber (Norrköping → Linköping)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -88,6 +96,7 @@ Edfa Edfa_booster_roadm_Norrköping_to_fiber (Norrköping → Linköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Norrköping → Linköping)
  type_variety:                SSMF
@@ -96,7 +105,8 @@ Fiber          fiber (Norrköping → Linköping)
  total loss (dB):             11.00
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -9.00
+  reference pch out (dBm):     -9.00
+  actual pch out (dBm):        -9.00
 Edfa Edfa_preamp_roadm_Linköping_from_fiber (Norrköping → Linköping)
  type_variety:           openroadm_mw_mw_preamp_worstcase_ver5
  effective gain(dB):     11.00
@@ -109,10 +119,12 @@ Edfa Edfa_preamp_roadm_Linköping_from_fiber (Norrköping → Linköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.01
  output VOA (dB):        0.00
 Roadm roadm_Linköping
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Linköping_to_fiber (Linköping → Jönköping)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -125,6 +137,7 @@ Edfa Edfa_booster_roadm_Linköping_to_fiber (Linköping → Jönköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Linköping → Jönköping)
  type_variety:                SSMF
@@ -133,7 +146,8 @@ Fiber          fiber (Linköping → Jönköping)
  total loss (dB):             26.80
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -24.80
+  reference pch out (dBm):     -24.80
+  actual pch out (dBm):        -24.79
 Edfa Edfa_preamp_roadm_Jönköping_from_fiber (Linköping → Jönköping)
  type_variety:           openroadm_mw_mw_preamp_worstcase_ver5
  effective gain(dB):     26.80
@@ -146,10 +160,12 @@ Edfa Edfa_preamp_roadm_Jönköping_from_fiber (Linköping → Jönköping)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.04
  output VOA (dB):        0.00
 Roadm roadm_Jönköping
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Jönköping_to_fiber (Jönköping → Borås)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -162,6 +178,7 @@ Edfa Edfa_booster_roadm_Jönköping_to_fiber (Jönköping → Borås)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Jönköping → Borås)
  type_variety:                SSMF
@@ -170,7 +187,8 @@ Fiber          fiber (Jönköping → Borås)
  total loss (dB):             17.82
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -15.82
+  reference pch out (dBm):     -15.82
+  actual pch out (dBm):        -15.81
 Edfa Edfa_preamp_roadm_Borås_from_fiber (Jönköping → Borås)
  type_variety:           openroadm_mw_mw_preamp_worstcase_ver5
  effective gain(dB):     17.82
@@ -183,10 +201,12 @@ Edfa Edfa_preamp_roadm_Borås_from_fiber (Jönköping → Borås)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.01
  output VOA (dB):        0.00
 Roadm roadm_Borås
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa Edfa_booster_roadm_Borås_to_fiber (Borås → Gothenburg)
  type_variety:           openroadm_mw_mw_booster
  effective gain(dB):     22.00
@@ -199,6 +219,7 @@ Edfa Edfa_booster_roadm_Borås_to_fiber (Borås → Gothenburg)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.00
  output VOA (dB):        0.00
 Fiber          fiber (Borås → Gothenburg)
  type_variety:                SSMF
@@ -207,7 +228,8 @@ Fiber          fiber (Borås → Gothenburg)
  total loss (dB):             13.53
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -11.53
+  reference pch out (dBm):     -11.53
+  actual pch out (dBm):        -11.52
 Edfa Edfa_preamp_roadm_Gothenburg_from_fiber (Borås → Gothenburg)
  type_variety:           openroadm_mw_mw_preamp_worstcase_ver5
  effective gain(dB):     13.53
@@ -220,21 +242,24 @@ Edfa Edfa_preamp_roadm_Gothenburg_from_fiber (Borås → Gothenburg)
  Delta_P (dB):           0.00
  target pch (dBm):       2.00
  effective pch (dBm):    2.00
+  actual pch out (dBm):   2.02
  output VOA (dB):        0.00
 Roadm roadm_Gothenburg
-  effective loss (dB):  22.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     22.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Transceiver trx_Gothenburg
-  GSNR (0.1nm, dB):          19.27
-  GSNR (signal bw, dB):      15.24
+  GSNR (0.1nm, dB):          19.25
+  GSNR (signal bw, dB):      15.23
  OSNR ASE (0.1nm, dB):      21.84
  OSNR ASE (signal bw, dB):  17.82
  CD (ps/nm):                8350.42
  PMD (ps):                  7.99
  PDL (dB):                  3.74
+  Latency (ms):              2.45

 Transmission result for input power = 2.00 dBm:
-  Final GSNR (0.1 nm): [1;36;40m19.27 dB[0m
+  Final GSNR (0.1 nm): [1;36;40m19.25 dB[0m

 (No source node specified: picked trx_Stockholm)

--- a/tests/invocation/path_requests_run
+++ b/tests/invocation/path_requests_run
@@ -106,48 +106,13 @@
 ]
 [1;34;40mComputing all paths with constraints[0m
 [1;34;40mPropagating on selected path[0m
-request 0
-Computing path from trx Lorient_KMA to trx Vannes_KBE
-with path constraint: ['trx Lorient_KMA', 'trx Vannes_KBE']
-Computed path (roadms):['roadm Lorient_KMA', 'roadm Vannes_KBE']
-
-request 1
-Computing path from trx Brest_KLA to trx Vannes_KBE
-with path constraint: ['trx Brest_KLA', 'roadm Brest_KLA', 'roadm Lannion_CAS', 'roadm Lorient_KMA', 'roadm Vannes_KBE', 'trx Vannes_KBE']
-Computed path (roadms):['roadm Brest_KLA', 'roadm Lannion_CAS', 'roadm Lorient_KMA', 'roadm Vannes_KBE']
-
-request 3
-Computing path from trx Lannion_CAS to trx Rennes_STA
-with path constraint: ['trx Lannion_CAS', 'trx Rennes_STA']
-Computed path (roadms):['roadm Lannion_CAS', 'roadm Rennes_STA']
-
-request 4
-Computing path from trx Rennes_STA to trx Lannion_CAS
-with path constraint: ['trx Rennes_STA', 'trx Lannion_CAS']
-Computed path (roadms):['roadm Rennes_STA', 'roadm Vannes_KBE', 'roadm Lorient_KMA', 'roadm Lannion_CAS']
-
-request 5
-Computing path from trx Rennes_STA to trx Lannion_CAS
-with path constraint: ['trx Rennes_STA', 'trx Lannion_CAS']
-Computed path (roadms):['roadm Rennes_STA', 'roadm Lannion_CAS']
-
-request 7 | 6
-Computing path from trx Lannion_CAS to trx Lorient_KMA
-with path constraint: ['trx Lannion_CAS', 'trx Lorient_KMA']
-Computed path (roadms):['roadm Lannion_CAS', 'roadm Lorient_KMA']
-
-request 7b
-Computing path from trx Lannion_CAS to trx Lorient_KMA
-with path constraint: ['trx Lannion_CAS', 'trx Lorient_KMA']
-Computed path (roadms):['roadm Lannion_CAS', 'roadm Lorient_KMA']
-
 [1;34;40mResult summary[0m
 req id   demand                                GSNR@bandwidth A-Z (Z-A)   GSNR@0.1nm A-Z (Z-A)        Receiver minOSNR               mode                    Gbit/s              nb of tsp pairs      N,M or blocking reason 
-0       trx Lorient_KMA to trx Vannes_KBE :             24.83                    28.92                      14                     mode 1                   100.0                      1                     (-284,4)        
-1       trx Brest_KLA to trx Vannes_KBE :               17.75                    21.83                      14                     mode 1                   200.0                      2                     (-272,8)        
-3       trx Lannion_CAS to trx Rennes_STA :             22.21                    26.29                      13                     mode 1                    60.0                      1                     (-284,4)        
-4       trx Rennes_STA to trx Lannion_CAS :             16.06                    23.29                      17                     mode 2                   150.0                      1                     (-258,6)        
-5       trx Rennes_STA to trx Lannion_CAS :             20.31                    27.54                      17                     mode 2                    20.0                      1                     (-274,6)        
-7 | 6   trx Lannion_CAS to trx Lorient_KMA :            19.52                    23.61                      14                     mode 1                   700.0                      7                    (-224,28)        
-7b      trx Lannion_CAS to trx Lorient_KMA :            19.61                    23.69                      14                     mode 1                   400.0                      4                    (-172,24)        
+0       trx Lorient_KMA to trx Vannes_KBE :             24.83                    28.92                      14                     mode 1                   100.0                      1                   ([-284],[4])      
+1       trx Brest_KLA to trx Vannes_KBE :               17.74                    21.82                      14                     mode 1                   200.0                      2                   ([-272],[8])      
+3       trx Lannion_CAS to trx Rennes_STA :             22.19                    26.28                      13                     mode 1                    60.0                      1                   ([-284],[4])      
+4       trx Rennes_STA to trx Lannion_CAS :             16.06                    23.29                      17                     mode 2                   150.0                      1                   ([-258],[6])      
+5       trx Rennes_STA to trx Lannion_CAS :              20.3                    27.53                      17                     mode 2                    20.0                      1                   ([-274],[6])      
+7 | 6   trx Lannion_CAS to trx Lorient_KMA :            19.52                    23.61                      14                     mode 1                   700.0                      7                  ([-224],[28])      
+7b      trx Lannion_CAS to trx Lorient_KMA :            19.61                    23.69                      14                     mode 1                   400.0                      4                  ([-172],[24])      
 [1;33;40mResult summary shows mean GSNR and OSNR (average over all channels)[0m
--- a/tests/invocation/path_requests_run_CD_PMD_PDL_missing
+++ b/tests/invocation/path_requests_run_CD_PMD_PDL_missing
@@ -0,0 +1,24 @@
+[1;34;40mList of disjunctions[0m
+[]
+[1;34;40mAggregating similar requests[0m
+[1;34;40mThe following services have been requested:[0m
+[PathRequest 0
+	source: 	trx Abilene
+	destination:	trx Albany
+	trx type:	Voyager
+	trx mode:	mode 3
+	baud_rate:	44.0 Gbaud
+	bit_rate:	300.0 Gb/s
+	spacing:	62.50000000000001 GHz
+	power:  	0.0 dBm
+	nb channels: 	76
+	path_bandwidth: 	100.0 Gbit/s
+	nodes-list:	[]
+	loose-list:	[]
+]
+[1;34;40mComputing all paths with constraints[0m
+[1;34;40mPropagating on selected path[0m
+[1;34;40mResult summary[0m
+req id   demand                       GSNR@bandwidth A-Z (Z-A)   GSNR@0.1nm A-Z (Z-A)        Receiver minOSNR               mode                    Gbit/s              nb of tsp pairs      N,M or blocking reason 
+0       trx Abilene to trx Albany :             9.04                     14.5                      -                      mode 3                   100.0                      -                MODE_NOT_FEASIBLE    
+[1;33;40mResult summary shows mean GSNR and OSNR (average over all channels)[0m
--- a/tests/invocation/spectrum1_transmission_main_example
+++ b/tests/invocation/spectrum1_transmission_main_example
@@ -0,0 +1,102 @@
+User input for spectrum used for propagation instead of SI
+There are 76 channels propagating
+Power mode is set to True
+=> it can be modified in eqpt_config.json - Span
+
+There are 3 fiber spans over 130 km between trx Lannion_CAS and trx Lorient_KMA
+
+Now propagating between trx Lannion_CAS and trx Lorient_KMA:
+
+Propagating with input power = [1;36;40m0.00 dBm[0m:
+Transceiver trx Lannion_CAS
+  GSNR (0.1nm, dB):          40.00
+  GSNR (signal bw, dB):      35.92
+  OSNR ASE (0.1nm, dB):      40.00
+  OSNR ASE (signal bw, dB):  35.92
+  CD (ps/nm):                0.00
+  PMD (ps):                  0.00
+  PDL (dB):                  0.00
+  Latency (ms):              0.00
+Roadm roadm Lannion_CAS
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Edfa east edfa in Lannion_CAS to Corlay
+  type_variety:           std_medium_gain
+  effective gain(dB):     21.00
+  (before att_in and before output VOA)
+  noise figure (dB):      6.36
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -1.19
+  Power Out (dBm):        19.82
+  Delta_P (dB):           1.00
+  target pch (dBm):       1.00
+  effective pch (dBm):    1.00
+  actual pch out (dBm):   1.01
+  output VOA (dB):        0.00
+Fiber          fiber (Lannion_CAS → Corlay)-F061
+  type_variety:                SSMF
+  length (km):                 20.00
+  pad att_in (dB):             0.00
+  total loss (dB):             4.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -3.00
+  actual pch out (dBm):        -2.99
+Fused west fused spans in Corlay
+  loss (dB): 1.00
+Fiber          fiber (Corlay → Loudeac)-F010
+  type_variety:                SSMF
+  length (km):                 50.00
+  pad att_in (dB):             0.00
+  total loss (dB):             10.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -14.00
+  actual pch out (dBm):        -13.99
+Fused west fused spans in Loudeac
+  loss (dB): 1.00
+Fiber          fiber (Loudeac → Lorient_KMA)-F054
+  type_variety:                SSMF
+  length (km):                 60.00
+  pad att_in (dB):             0.00
+  total loss (dB):             12.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -27.00
+  actual pch out (dBm):        -26.99
+Edfa west edfa in Lorient_KMA to Loudeac
+  type_variety:           std_high_gain
+  effective gain(dB):     28.00
+  (before att_in and before output VOA)
+  noise figure (dB):      5.92
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -8.18
+  Power Out (dBm):        19.85
+  Delta_P (dB):           1.00
+  target pch (dBm):       1.00
+  effective pch (dBm):    1.00
+  actual pch out (dBm):   1.05
+  output VOA (dB):        0.00
+Roadm roadm Lorient_KMA
+  effective loss (dB):     21.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Transceiver trx Lorient_KMA
+  GSNR (0.1nm, dB):          23.61
+  GSNR (signal bw, dB):      19.53
+  OSNR ASE (0.1nm, dB):      23.89
+  OSNR ASE (signal bw, dB):  19.81
+  CD (ps/nm):                2171.00
+  PMD (ps):                  0.46
+  PDL (dB):                  0.00
+  Latency (ms):              0.64
+
+Transmission result for input power = 0.00 dBm:
+  Final GSNR (0.1 nm): [1;36;40m23.61 dB[0m
+
+(No source node specified: picked trx Lannion_CAS)
+
+(No destination node specified: picked trx Lorient_KMA)
--- a/tests/invocation/spectrum2_transmission_main_example
+++ b/tests/invocation/spectrum2_transmission_main_example
@@ -0,0 +1,165 @@
+User input for spectrum used for propagation instead of SI
+There are 60 channels propagating
+Power mode is set to True
+=> it can be modified in eqpt_config.json - Span
+
+There are 3 fiber spans over 130 km between trx Lannion_CAS and trx Lorient_KMA
+
+Now propagating between trx Lannion_CAS and trx Lorient_KMA:
+
+Propagating with input power = [1;36;40m0.00 dBm[0m:
+Transceiver trx Lannion_CAS
+  GSNR (0.1nm, dB):          mode_1: 40.00, mode_2: 40.00
+  GSNR (signal bw, dB):      mode_1: 35.92, mode_2: 32.91
+  OSNR ASE (0.1nm, dB):      mode_1: 40.00, mode_2: 40.00
+  OSNR ASE (signal bw, dB):  mode_1: 35.92, mode_2: 32.91
+  CD (ps/nm):                0.00
+  PMD (ps):                  0.00
+  PDL (dB):                  0.00
+  Latency (ms):              0.00
+Roadm roadm Lannion_CAS
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    mode_1: -20.00, mode_2: -20.00
+Edfa east edfa in Lannion_CAS to Corlay
+  type_variety:           std_medium_gain
+  effective gain(dB):     21.00
+  (before att_in and before output VOA)
+  noise figure (dB):      6.36
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -2.22
+  Power Out (dBm):        18.79
+  Delta_P (dB):           1.00
+  target pch (dBm):       1.00
+  effective pch (dBm):    1.00
+  actual pch out (dBm):   mode_1: 1.01, mode_2: 1.02
+  output VOA (dB):        0.00
+Fiber          fiber (Lannion_CAS → Corlay)-F061
+  type_variety:                SSMF
+  length (km):                 20.00
+  pad att_in (dB):             0.00
+  total loss (dB):             4.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -3.00
+  actual pch out (dBm):        mode_1: -2.99, mode_2: -2.98
+Fused west fused spans in Corlay
+  loss (dB): 1.00
+Fiber          fiber (Corlay → Loudeac)-F010
+  type_variety:                SSMF
+  length (km):                 50.00
+  pad att_in (dB):             0.00
+  total loss (dB):             10.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -14.00
+  actual pch out (dBm):        mode_1: -13.99, mode_2: -13.98
+Fused west fused spans in Loudeac
+  loss (dB): 1.00
+Fiber          fiber (Loudeac → Lorient_KMA)-F054
+  type_variety:                SSMF
+  length (km):                 60.00
+  pad att_in (dB):             0.00
+  total loss (dB):             12.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -27.00
+  actual pch out (dBm):        mode_1: -26.99, mode_2: -26.98
+Edfa west edfa in Lorient_KMA to Loudeac
+  type_variety:           std_high_gain
+  effective gain(dB):     28.00
+  (before att_in and before output VOA)
+  noise figure (dB):      5.92
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -9.21
+  Power Out (dBm):        18.84
+  Delta_P (dB):           1.00
+  target pch (dBm):       1.00
+  effective pch (dBm):    1.00
+  actual pch out (dBm):   mode_1: 1.04, mode_2: 1.09
+  output VOA (dB):        0.00
+Roadm roadm Lorient_KMA
+  effective loss (dB):     21.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    mode_1: -20.00, mode_2: -20.00
+Transceiver trx Lorient_KMA
+  GSNR (0.1nm, dB):          mode_1: 23.66, mode_2: 23.81
+  GSNR (signal bw, dB):      mode_1: 19.58, mode_2: 16.72
+  OSNR ASE (0.1nm, dB):      mode_1: 23.91, mode_2: 23.87
+  OSNR ASE (signal bw, dB):  mode_1: 19.83, mode_2: 16.78
+  CD (ps/nm):                2171.00
+  PMD (ps):                  0.46
+  PDL (dB):                  0.00
+  Latency (ms):              0.64
+
+Transmission result for input power = 0.00 dBm:
+  Final GSNR (0.1 nm): [1;36;40m23.72 dB[0m
+
+The GSNR per channel at the end of the line is:
+Ch. #   Channel frequency (THz)       Channel power (dBm)    OSNR ASE (signal bw, dB)     SNR NLI (signal bw, dB)        GSNR (signal bw, dB)
+    1                 191.40000                    -20.04                       19.85                       33.52                       19.66
+    2                 191.45000                    -20.04                       19.85                       32.93                       19.64
+    3                 191.50000                    -20.04                       19.84                       32.67                       19.62
+    4                 191.55000                    -20.04                       19.84                       32.50                       19.61
+    5                 191.60000                    -20.04                       19.84                       32.39                       19.61
+    6                 191.65000                    -20.04                       19.84                       32.30                       19.60
+    7                 191.70000                    -20.04                       19.84                       32.22                       19.60
+    8                 191.75000                    -20.04                       19.84                       32.16                       19.59
+    9                 191.80000                    -20.04                       19.84                       32.11                       19.59
+   10                 191.85000                    -20.04                       19.84                       32.07                       19.59
+   11                 191.90000                    -20.04                       19.84                       32.04                       19.58
+   12                 191.95000                    -20.04                       19.84                       32.00                       19.58
+   13                 192.00000                    -20.04                       19.83                       31.98                       19.58
+   14                 192.05000                    -20.04                       19.83                       31.95                       19.57
+   15                 192.10000                    -20.04                       19.83                       31.93                       19.57
+   16                 192.15000                    -20.04                       19.83                       31.91                       19.57
+   17                 192.20000                    -20.04                       19.83                       31.90                       19.57
+   18                 192.25000                    -20.04                       19.83                       31.88                       19.57
+   19                 192.30000                    -20.04                       19.83                       31.87                       19.56
+   20                 192.35000                    -20.04                       19.83                       31.87                       19.56
+   21                 192.40000                    -20.04                       19.83                       31.86                       19.56
+   22                 192.45000                    -20.04                       19.82                       31.86                       19.56
+   23                 192.50000                    -20.04                       19.82                       31.86                       19.56
+   24                 192.55000                    -20.04                       19.82                       31.86                       19.56
+   25                 192.60000                    -20.04                       19.82                       31.87                       19.56
+   26                 192.65000                    -20.04                       19.82                       31.88                       19.56
+   27                 192.70000                    -20.04                       19.82                       31.89                       19.56
+   28                 192.75000                    -20.04                       19.82                       31.91                       19.56
+   29                 192.80000                    -20.04                       19.82                       31.93                       19.56
+   30                 192.85000                    -20.04                       19.82                       31.97                       19.56
+   31                 192.90000                    -20.04                       19.82                       32.01                       19.56
+   32                 192.95000                    -20.04                       19.81                       32.07                       19.56
+   33                 193.00000                    -20.04                       19.81                       32.16                       19.57
+   34                 193.05000                    -20.04                       19.81                       32.31                       19.57
+   35                 193.10000                    -20.04                       19.81                       32.65                       19.59
+   36                 193.16250                    -20.09                       16.80                       33.73                       16.71
+   37                 193.23750                    -20.09                       16.80                       34.22                       16.72
+   38                 193.31250                    -20.09                       16.80                       34.47                       16.72
+   39                 193.38750                    -20.09                       16.79                       34.63                       16.72
+   40                 193.46250                    -20.09                       16.79                       34.75                       16.72
+   41                 193.53750                    -20.09                       16.79                       34.84                       16.72
+   42                 193.61250                    -20.09                       16.79                       34.92                       16.72
+   43                 193.68750                    -20.09                       16.79                       34.99                       16.72
+   44                 193.76250                    -20.09                       16.79                       35.04                       16.72
+   45                 193.83750                    -20.09                       16.78                       35.10                       16.72
+   46                 193.91250                    -20.09                       16.78                       35.15                       16.72
+   47                 193.98750                    -20.09                       16.78                       35.19                       16.72
+   48                 194.06250                    -20.09                       16.78                       35.24                       16.72
+   49                 194.13750                    -20.09                       16.78                       35.28                       16.72
+   50                 194.21250                    -20.09                       16.78                       35.33                       16.72
+   51                 194.28750                    -20.09                       16.78                       35.37                       16.72
+   52                 194.36250                    -20.09                       16.77                       35.42                       16.72
+   53                 194.43750                    -20.09                       16.77                       35.47                       16.71
+   54                 194.51250                    -20.09                       16.77                       35.53                       16.71
+   55                 194.58750                    -20.09                       16.77                       35.59                       16.71
+   56                 194.66250                    -20.09                       16.77                       35.67                       16.71
+   57                 194.73750                    -20.09                       16.77                       35.77                       16.71
+   58                 194.81250                    -20.09                       16.76                       35.90                       16.71
+   59                 194.88750                    -20.09                       16.76                       36.11                       16.71
+   60                 194.96250                    -20.09                       16.76                       36.58                       16.72
+
+(No source node specified: picked trx Lannion_CAS)
+
+(No destination node specified: picked trx Lorient_KMA)
--- a/tests/invocation/transmission_main_example
+++ b/tests/invocation/transmission_main_example
@@ -15,6 +15,7 @@ Transceiver Site_A
  CD (ps/nm):                0.00
  PMD (ps):                  0.00
  PDL (dB):                  0.00
+  Latency (ms):              0.00
 Fiber          Span1
  type_variety:                SSMF
  length (km):                 80.00
@@ -22,7 +23,8 @@ Fiber          Span1
  total loss (dB):             17.00
  (includes conn loss (dB) in: 0.50 out: 0.50)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -17.00
+  reference pch out (dBm):     -17.00
+  actual pch out (dBm):        -17.00
 Edfa Edfa1
  type_variety:           std_low_gain
  effective gain(dB):     15.00
@@ -35,18 +37,20 @@ Edfa Edfa1
  Delta_P (dB):           -2.00
  target pch (dBm):       -2.00
  effective pch (dBm):    -2.00
+  actual pch out (dBm):   -1.99
  output VOA (dB):        0.00
 Transceiver Site_B
-  GSNR (0.1nm, dB):          31.17
-  GSNR (signal bw, dB):      27.09
+  GSNR (0.1nm, dB):          31.18
+  GSNR (signal bw, dB):      27.10
  OSNR ASE (0.1nm, dB):      33.30
  OSNR ASE (signal bw, dB):  29.21
  CD (ps/nm):                1336.00
  PMD (ps):                  0.36
  PDL (dB):                  0.00
+  Latency (ms):              0.39

 Transmission result for input power = 0.00 dBm:
-  Final GSNR (0.1 nm): [1;36;40m31.17 dB[0m
+  Final GSNR (0.1 nm): [1;36;40m31.18 dB[0m

 (No source node specified: picked Site_A)

--- a/tests/invocation/transmission_main_example__raman
+++ b/tests/invocation/transmission_main_example__raman
@@ -15,6 +15,7 @@ Transceiver Site_A
  CD (ps/nm):                0.00
  PMD (ps):                  0.00
  PDL (dB):                  0.00
+  Latency (ms):              0.00
 RamanFiber          Span1
  type_variety:                SSMF
  length (km):                 80.00
@@ -22,112 +23,115 @@ RamanFiber          Span1
  total loss (dB):             17.00
  (includes conn loss (dB) in: 0.50 out: 0.50)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -7.77
+  reference pch out (dBm):     -7.20
+  actual pch out (dBm):        -7.47
 Fused Fused1
  loss (dB): 0.00
 Edfa Edfa1
  type_variety:           std_low_gain
-  effective gain(dB):     5.77
+  effective gain(dB):     5.20
  (before att_in and before output VOA)
-  noise figure (dB):      13.23
+  noise figure (dB):      13.80
  (including att_in)
-  pad att_in (dB):        2.23
-  Power In (dBm):         11.04
+  pad att_in (dB):        2.80
+  Power In (dBm):         11.61
  Power Out (dBm):        16.81
  Delta_P (dB):           -2.00
  target pch (dBm):       -2.00
  effective pch (dBm):    -2.00
+  actual pch out (dBm):   -2.26
  output VOA (dB):        0.00
 Transceiver Site_B
-  GSNR (0.1nm, dB):          31.44
-  GSNR (signal bw, dB):      27.36
+  GSNR (0.1nm, dB):          31.42
+  GSNR (signal bw, dB):      27.34
  OSNR ASE (0.1nm, dB):      34.21
  OSNR ASE (signal bw, dB):  30.13
  CD (ps/nm):                1336.00
  PMD (ps):                  0.36
  PDL (dB):                  0.00
+  Latency (ms):              0.39

 Transmission result for input power = 0.00 dBm:
-  Final GSNR (0.1 nm): [1;36;40m31.44 dB[0m
+  Final GSNR (0.1 nm): [1;36;40m31.42 dB[0m

 The GSNR per channel at the end of the line is:
 Ch. #   Channel frequency (THz)       Channel power (dBm)    OSNR ASE (signal bw, dB)     SNR NLI (signal bw, dB)        GSNR (signal bw, dB)
-    1                    191.35                      0.21                       31.62                       31.43                       28.52
-    2                    191.40                      0.17                       31.60                       31.35                       28.46
-    3                    191.45                      0.13                       31.58                       31.26                       28.41
-    4                    191.50                      0.09                       31.56                       31.18                       28.36
-    5                    191.55                      0.03                       31.53                       31.10                       28.30
-    6                    191.60                     -0.02                       31.50                       31.02                       28.24
-    7                    191.65                     -0.08                       31.46                       30.94                       28.19
-    8                    191.70                     -0.14                       31.43                       30.87                       28.13
-    9                    191.75                     -0.20                       31.40                       30.79                       28.08
-   10                    191.80                     -0.27                       31.37                       30.72                       28.02
-   11                    191.85                     -0.33                       31.33                       30.65                       27.97
-   12                    191.90                     -0.40                       31.29                       30.58                       27.91
-   13                    191.95                     -0.46                       31.26                       30.51                       27.86
-   14                    192.00                     -0.53                       31.22                       30.44                       27.80
-   15                    192.05                     -0.59                       31.18                       30.37                       27.75
-   16                    192.10                     -0.66                       31.15                       30.30                       27.69
-   17                    192.15                     -0.73                       31.11                       30.24                       27.64
-   18                    192.20                     -0.80                       31.07                       30.17                       27.59
-   19                    192.25                     -0.86                       31.03                       30.18                       27.57
-   20                    192.30                     -0.94                       30.99                       30.19                       27.56
-   21                    192.35                     -1.02                       30.94                       30.20                       27.54
-   22                    192.40                     -1.09                       30.90                       30.20                       27.53
-   23                    192.45                     -1.17                       30.86                       30.21                       27.51
-   24                    192.50                     -1.24                       30.81                       30.22                       27.50
-   25                    192.55                     -1.31                       30.77                       30.23                       27.48
-   26                    192.60                     -1.38                       30.73                       30.23                       27.46
-   27                    192.65                     -1.45                       30.69                       30.24                       27.45
-   28                    192.70                     -1.52                       30.65                       30.25                       27.43
-   29                    192.75                     -1.59                       30.60                       30.26                       27.42
-   30                    192.80                     -1.67                       30.56                       30.27                       27.40
-   31                    192.85                     -1.74                       30.52                       30.27                       27.38
-   32                    192.90                     -1.81                       30.47                       30.28                       27.37
-   33                    192.95                     -1.88                       30.43                       30.29                       27.35
-   34                    193.00                     -1.95                       30.39                       30.30                       27.33
-   35                    193.05                     -2.02                       30.34                       30.30                       27.31
-   36                    193.10                     -2.08                       30.30                       30.31                       27.30
-   37                    193.15                     -2.15                       30.26                       30.32                       27.28
-   38                    193.20                     -2.22                       30.21                       30.34                       27.26
-   39                    193.25                     -2.29                       30.17                       30.36                       27.25
-   40                    193.30                     -2.36                       30.13                       30.37                       27.24
-   41                    193.35                     -2.43                       30.08                       30.39                       27.22
-   42                    193.40                     -2.50                       30.04                       30.41                       27.21
-   43                    193.45                     -2.56                       29.99                       30.43                       27.19
-   44                    193.50                     -2.63                       29.95                       30.44                       27.18
-   45                    193.55                     -2.70                       29.90                       30.46                       27.16
-   46                    193.60                     -2.78                       29.85                       30.48                       27.15
-   47                    193.65                     -2.85                       29.80                       30.50                       27.13
-   48                    193.70                     -2.92                       29.76                       30.52                       27.11
-   49                    193.75                     -2.99                       29.71                       30.54                       27.09
-   50                    193.80                     -3.06                       29.66                       30.55                       27.07
-   51                    193.85                     -3.14                       29.61                       30.57                       27.06
-   52                    193.90                     -3.21                       29.56                       30.59                       27.04
-   53                    193.95                     -3.28                       29.52                       30.61                       27.02
-   54                    194.00                     -3.35                       29.47                       30.63                       27.00
-   55                    194.05                     -3.42                       29.42                       30.65                       26.98
-   56                    194.10                     -3.50                       29.37                       30.67                       26.96
-   57                    194.15                     -3.57                       29.32                       30.72                       26.95
-   58                    194.20                     -3.64                       29.26                       30.78                       26.95
-   59                    194.25                     -3.72                       29.21                       30.84                       26.94
-   60                    194.30                     -3.79                       29.16                       30.90                       26.94
-   61                    194.35                     -3.86                       29.11                       30.96                       26.93
-   62                    194.40                     -3.93                       29.06                       31.02                       26.92
-   63                    194.45                     -4.01                       29.01                       31.09                       26.91
-   64                    194.50                     -4.08                       28.96                       31.15                       26.91
-   65                    194.55                     -4.14                       28.91                       31.21                       26.90
-   66                    194.60                     -4.21                       28.86                       31.28                       26.90
-   67                    194.65                     -4.27                       28.82                       31.34                       26.89
-   68                    194.70                     -4.34                       28.77                       31.41                       26.88
-   69                    194.75                     -4.41                       28.72                       31.48                       26.88
-   70                    194.80                     -4.47                       28.67                       31.55                       26.87
-   71                    194.85                     -4.54                       28.63                       31.62                       26.86
-   72                    194.90                     -4.60                       28.58                       31.69                       26.85
-   73                    194.95                     -4.67                       28.53                       31.76                       26.84
-   74                    195.00                     -4.73                       28.48                       31.84                       26.83
-   75                    195.05                     -4.80                       28.43                       31.91                       26.82
-   76                    195.10                     -4.86                       28.38                       31.91                       26.79
+    1                 191.35000                      0.22                       31.64                       31.55                       28.58
+    2                 191.40000                      0.18                       31.62                       31.46                       28.53
+    3                 191.45000                      0.15                       31.60                       31.37                       28.47
+    4                 191.50000                      0.11                       31.58                       31.28                       28.42
+    5                 191.55000                      0.05                       31.54                       31.20                       28.36
+    6                 191.60000                     -0.01                       31.51                       31.11                       28.30
+    7                 191.65000                     -0.07                       31.48                       31.03                       28.24
+    8                 191.70000                     -0.12                       31.45                       30.95                       28.18
+    9                 191.75000                     -0.18                       31.42                       30.87                       28.13
+   10                 191.80000                     -0.25                       31.38                       30.79                       28.07
+   11                 191.85000                     -0.31                       31.35                       30.72                       28.01
+   12                 191.90000                     -0.38                       31.31                       30.64                       27.95
+   13                 191.95000                     -0.44                       31.27                       30.57                       27.90
+   14                 192.00000                     -0.51                       31.24                       30.50                       27.84
+   15                 192.05000                     -0.58                       31.20                       30.42                       27.78
+   16                 192.10000                     -0.64                       31.16                       30.35                       27.73
+   17                 192.15000                     -0.71                       31.12                       30.29                       27.67
+   18                 192.20000                     -0.78                       31.08                       30.22                       27.62
+   19                 192.25000                     -0.85                       31.04                       30.22                       27.60
+   20                 192.30000                     -0.93                       31.00                       30.22                       27.58
+   21                 192.35000                     -1.00                       30.96                       30.23                       27.57
+   22                 192.40000                     -1.08                       30.91                       30.23                       27.55
+   23                 192.45000                     -1.16                       30.87                       30.23                       27.53
+   24                 192.50000                     -1.23                       30.82                       30.24                       27.51
+   25                 192.55000                     -1.30                       30.78                       30.24                       27.49
+   26                 192.60000                     -1.37                       30.74                       30.24                       27.47
+   27                 192.65000                     -1.44                       30.70                       30.25                       27.46
+   28                 192.70000                     -1.52                       30.65                       30.25                       27.44
+   29                 192.75000                     -1.59                       30.61                       30.25                       27.42
+   30                 192.80000                     -1.66                       30.57                       30.26                       27.40
+   31                 192.85000                     -1.73                       30.52                       30.26                       27.38
+   32                 192.90000                     -1.80                       30.48                       30.26                       27.36
+   33                 192.95000                     -1.87                       30.43                       30.27                       27.34
+   34                 193.00000                     -1.94                       30.39                       30.27                       27.32
+   35                 193.05000                     -2.01                       30.35                       30.27                       27.30
+   36                 193.10000                     -2.08                       30.30                       30.28                       27.28
+   37                 193.15000                     -2.15                       30.26                       30.28                       27.26
+   38                 193.20000                     -2.22                       30.22                       30.29                       27.24
+   39                 193.25000                     -2.29                       30.17                       30.31                       27.23
+   40                 193.30000                     -2.36                       30.13                       30.32                       27.21
+   41                 193.35000                     -2.43                       30.08                       30.33                       27.19
+   42                 193.40000                     -2.50                       30.04                       30.35                       27.18
+   43                 193.45000                     -2.56                       29.99                       30.36                       27.16
+   44                 193.50000                     -2.63                       29.95                       30.37                       27.14
+   45                 193.55000                     -2.71                       29.90                       30.39                       27.12
+   46                 193.60000                     -2.78                       29.85                       30.40                       27.11
+   47                 193.65000                     -2.85                       29.80                       30.41                       27.09
+   48                 193.70000                     -2.93                       29.75                       30.43                       27.07
+   49                 193.75000                     -3.00                       29.70                       30.44                       27.05
+   50                 193.80000                     -3.07                       29.65                       30.45                       27.02
+   51                 193.85000                     -3.15                       29.60                       30.47                       27.00
+   52                 193.90000                     -3.22                       29.55                       30.48                       26.98
+   53                 193.95000                     -3.29                       29.50                       30.50                       26.96
+   54                 194.00000                     -3.37                       29.45                       30.51                       26.94
+   55                 194.05000                     -3.44                       29.40                       30.52                       26.92
+   56                 194.10000                     -3.52                       29.35                       30.54                       26.89
+   57                 194.15000                     -3.59                       29.30                       30.59                       26.89
+   58                 194.20000                     -3.66                       29.25                       30.64                       26.88
+   59                 194.25000                     -3.74                       29.19                       30.70                       26.87
+   60                 194.30000                     -3.81                       29.14                       30.75                       26.86
+   61                 194.35000                     -3.89                       29.09                       30.81                       26.86
+   62                 194.40000                     -3.96                       29.04                       30.87                       26.85
+   63                 194.45000                     -4.04                       28.98                       30.93                       26.84
+   64                 194.50000                     -4.11                       28.93                       30.98                       26.83
+   65                 194.55000                     -4.18                       28.88                       31.04                       26.82
+   66                 194.60000                     -4.25                       28.83                       31.10                       26.81
+   67                 194.65000                     -4.31                       28.78                       31.17                       26.80
+   68                 194.70000                     -4.38                       28.74                       31.23                       26.79
+   69                 194.75000                     -4.45                       28.69                       31.29                       26.79
+   70                 194.80000                     -4.51                       28.64                       31.35                       26.78
+   71                 194.85000                     -4.58                       28.59                       31.42                       26.77
+   72                 194.90000                     -4.65                       28.54                       31.48                       26.76
+   73                 194.95000                     -4.71                       28.49                       31.55                       26.74
+   74                 195.00000                     -4.78                       28.44                       31.62                       26.73
+   75                 195.05000                     -4.85                       28.39                       31.69                       26.72
+   76                 195.10000                     -4.91                       28.34                       31.69                       26.69

 (No source node specified: picked Site_A)

--- a/tests/invocation/transmission_main_example_long
+++ b/tests/invocation/transmission_main_example_long
@@ -0,0 +1,455 @@
+There are 96 channels propagating
+Power mode is set to True
+=> it can be modified in eqpt_config.json - Span
+
+There are 15 fiber spans over 1200 km between Site_A and Site_B
+
+Now propagating between Site_A and Site_B:
+
+Propagating with input power = [1;36;40m0.00 dBm[0m:
+Transceiver Site_A
+  GSNR (0.1nm, dB):          100.00
+  GSNR (signal bw, dB):      95.92
+  OSNR ASE (0.1nm, dB):      100.00
+  OSNR ASE (signal bw, dB):  95.92
+  CD (ps/nm):                0.00
+  PMD (ps):                  0.00
+  PDL (dB):                  0.00
+  Latency (ms):              0.00
+Roadm roadm Site A
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Edfa booster A
+  type_variety:           std_medium_gain
+  effective gain(dB):     20.00
+  (before att_in and before output VOA)
+  noise figure (dB):      6.58
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -0.18
+  Power Out (dBm):        19.83
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.01
+  output VOA (dB):        0.00
+Fiber          Span1
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.99
+Edfa Edfa1
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.84
+  Power Out (dBm):        19.84
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.02
+  output VOA (dB):        0.00
+Fiber          Span2
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.98
+Edfa Edfa2
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.84
+  Power Out (dBm):        19.85
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.03
+  output VOA (dB):        0.00
+Fiber          Span3
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.97
+Edfa Edfa3
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.85
+  Power Out (dBm):        19.86
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.04
+  output VOA (dB):        0.00
+Fiber          Span4
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.96
+Edfa Edfa4
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.86
+  Power Out (dBm):        19.87
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.05
+  output VOA (dB):        0.00
+Fiber          Span5
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.95
+Edfa Edfa5
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.87
+  Power Out (dBm):        19.88
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.06
+  output VOA (dB):        0.00
+Roadm roadm Site C
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Edfa booster C
+  type_variety:           std_medium_gain
+  effective gain(dB):     20.00
+  (before att_in and before output VOA)
+  noise figure (dB):      6.58
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -0.18
+  Power Out (dBm):        19.83
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.01
+  output VOA (dB):        0.00
+Fiber          Span6
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.99
+Edfa Edfa6
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.84
+  Power Out (dBm):        19.84
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.02
+  output VOA (dB):        0.00
+Fiber          Span7
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.98
+Edfa Edfa7
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.84
+  Power Out (dBm):        19.85
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.03
+  output VOA (dB):        0.00
+Fiber          Span8
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.97
+Edfa Edfa8
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.85
+  Power Out (dBm):        19.86
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.04
+  output VOA (dB):        0.00
+Fiber          Span9
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.96
+Edfa Edfa9
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.86
+  Power Out (dBm):        19.87
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.05
+  output VOA (dB):        0.00
+Fiber          Span10
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.95
+Edfa Edfa10
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.87
+  Power Out (dBm):        19.88
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.06
+  output VOA (dB):        0.00
+Roadm roadm Site D
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Edfa booster D
+  type_variety:           std_medium_gain
+  effective gain(dB):     20.00
+  (before att_in and before output VOA)
+  noise figure (dB):      6.58
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -0.18
+  Power Out (dBm):        19.83
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.01
+  output VOA (dB):        0.00
+Fiber          Span11
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.99
+Edfa Edfa11
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.83
+  Power Out (dBm):        19.84
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.02
+  output VOA (dB):        0.00
+Fiber          Span12
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.98
+Edfa Edfa12
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.84
+  Power Out (dBm):        19.85
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.03
+  output VOA (dB):        0.00
+Roadm roadm Site E
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Edfa booster E
+  type_variety:           std_medium_gain
+  effective gain(dB):     20.00
+  (before att_in and before output VOA)
+  noise figure (dB):      6.58
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         -0.18
+  Power Out (dBm):        19.83
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.01
+  output VOA (dB):        0.00
+Fiber          Span13
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.99
+Edfa Edfa13
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.83
+  Power Out (dBm):        19.84
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.02
+  output VOA (dB):        0.00
+Fiber          Span14
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.98
+Edfa Edfa14
+  type_variety:           test_fixed_gain
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      9.00
+  (including att_in)
+  pad att_in (dB):        4.00
+  Power In (dBm):         3.84
+  Power Out (dBm):        19.85
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.03
+  output VOA (dB):        0.00
+Fiber          Span15
+  type_variety:                SSMF
+  length (km):                 80.00
+  pad att_in (dB):             0.00
+  total loss (dB):             16.00
+  (includes conn loss (dB) in: 0.00 out: 0.00)
+  (conn loss out includes EOL margin defined in eqpt_config.json)
+  reference pch out (dBm):     -16.00
+  actual pch out (dBm):        -15.97
+Edfa Edfa15
+  type_variety:           test
+  effective gain(dB):     16.00
+  (before att_in and before output VOA)
+  noise figure (dB):      8.86
+  (including att_in)
+  pad att_in (dB):        0.00
+  Power In (dBm):         3.85
+  Power Out (dBm):        19.86
+  Delta_P (dB):           0.00
+  target pch (dBm):       0.00
+  effective pch (dBm):    0.00
+  actual pch out (dBm):   0.04
+  output VOA (dB):        0.00
+Roadm roadm Site B
+  effective loss (dB):     20.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
+Transceiver Site_B
+  GSNR (0.1nm, dB):          17.84
+  GSNR (signal bw, dB):      13.76
+  OSNR ASE (0.1nm, dB):      19.70
+  OSNR ASE (signal bw, dB):  15.62
+  CD (ps/nm):                20040.00
+  PMD (ps):                  1.39
+  PDL (dB):                  0.00
+  Latency (ms):              5.88
+
+Transmission result for input power = 0.00 dBm:
+  Final GSNR (0.1 nm): [1;36;40m17.84 dB[0m
+
+(No source node specified: picked Site_A)
+
+(No destination node specified: picked Site_B)
--- a/tests/invocation/transmission_saturated
+++ b/tests/invocation/transmission_saturated
@@ -1,242 +1,6 @@
 There are 96 channels propagating
 Power mode is set to True
 => it can be modified in eqpt_config.json - Span
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Lorient_KMA to Loudeac
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING[0m: WARNING: effective gain in Node east edfa in Lannion_CAS to Stbrieuc is above user specified amplifier std_low_gain
-max flat gain: 16dB ; required gain: 23.0dB. Please check amplifier type.
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Rennes_STA to Stbrieuc
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING[0m: WARNING: effective gain in Node east edfa in Lannion_CAS to Morlaix is above user specified amplifier std_low_gain
-max flat gain: 16dB ; required gain: 23.5dB. Please check amplifier type.
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Brest_KLA to Morlaix
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Lorient_KMA to Loudeac
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING[0m: WARNING: effective gain in Node west edfa in Lannion_CAS to Corlay is above user specified amplifier test
-max flat gain: 25dB ; required gain: 29.82dB. Please check amplifier type.
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Lorient_KMA to Vannes_KBE
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Vannes_KBE to Lorient_KMA
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Lorient_KMA to Quimper
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Quimper to Lorient_KMA
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Brest_KLA to Quimper
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Vannes_KBE to Lorient_KMA
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Lorient_KMA to Vannes_KBE
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Vannes_KBE to Ploermel
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Ploermel to Vannes_KBE
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Rennes_STA to Ploermel
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Rennes_STA to Stbrieuc
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Stbrieuc to Rennes_STA
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Lannion_CAS to Stbrieuc
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Rennes_STA to Ploermel
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Vannes_KBE to Ploermel
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Brest_KLA to Morlaix
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING[0m: WARNING: effective gain in Node east edfa in Brest_KLA to Quimper is above user specified amplifier std_low_gain
-max flat gain: 16dB ; required gain: 23.0dB. Please check amplifier type.
-[1;31;40mWARNING:[0m target gain and power in node east edfa in Quimper to Lorient_KMA
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in Lorient_KMA to Quimper
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in a to b
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in b to a
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in a to c
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in c to a
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in b to a
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in a to b
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in b to f
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in f to b
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in c to a
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in a to c
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in d to c
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in c to f
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in f to c
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in d to c
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in c to d
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in d to e
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in e to d
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in e to d
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in d to e
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in e to g
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in g to e
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in f to c
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in c to f
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in f to b
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in b to f
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in f to h
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in h to f
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in g to e
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in e to g
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in g to h
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in h to g
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in h to f
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in f to h
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node east edfa in h to g
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-
-[1;31;40mWARNING:[0m target gain and power in node west edfa in g to h
-     is beyond all available amplifiers capabilities and/or extended_gain_range:
-    a power reduction of -1.82 is applied
-

 There are 3 fiber spans over 130 km between trx Lannion_CAS and trx Lorient_KMA

@@ -251,9 +15,11 @@ Transceiver trx Lannion_CAS
  CD (ps/nm):                0.00
  PMD (ps):                  0.00
  PDL (dB):                  0.00
+  Latency (ms):              0.00
 Roadm roadm Lannion_CAS
-  effective loss (dB):  23.00
-  pch out (dBm):        -20.00
+  effective loss (dB):     23.00
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Edfa east edfa in Lannion_CAS to Corlay
  type_variety:           test
  effective gain(dB):     21.18
@@ -266,6 +32,7 @@ Edfa east edfa in Lannion_CAS to Corlay
  Delta_P (dB):           0.00
  target pch (dBm):       3.00
  effective pch (dBm):    1.18
+  actual pch out (dBm):   1.18
  output VOA (dB):        0.00
 Fiber          fiber (Lannion_CAS → Corlay)-F061
  type_variety:                SSMF
@@ -274,7 +41,8 @@ Fiber          fiber (Lannion_CAS → Corlay)-F061
  total loss (dB):             4.00
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -2.82
+  reference pch out (dBm):     -2.82
+  actual pch out (dBm):        -2.81
 Fused west fused spans in Corlay
  loss (dB): 1.00
 Fiber          fiber (Corlay → Loudeac)-F010
@@ -284,7 +52,8 @@ Fiber          fiber (Corlay → Loudeac)-F010
  total loss (dB):             10.00
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -13.82
+  reference pch out (dBm):     -13.82
+  actual pch out (dBm):        -13.81
 Fused west fused spans in Loudeac
  loss (dB): 1.00
 Fiber          fiber (Loudeac → Lorient_KMA)-F054
@@ -294,7 +63,8 @@ Fiber          fiber (Loudeac → Lorient_KMA)-F054
  total loss (dB):             12.00
  (includes conn loss (dB) in: 0.00 out: 0.00)
  (conn loss out includes EOL margin defined in eqpt_config.json)
-  pch out (dBm): -26.82
+  reference pch out (dBm):     -26.82
+  actual pch out (dBm):        -26.81
 Edfa west edfa in Lorient_KMA to Loudeac
  type_variety:           test
  effective gain(dB):     27.99
@@ -307,21 +77,24 @@ Edfa west edfa in Lorient_KMA to Loudeac
  Delta_P (dB):           -1.82
  target pch (dBm):       1.18
  effective pch (dBm):    1.17
+  actual pch out (dBm):   1.21
  output VOA (dB):        0.00
 Roadm roadm Lorient_KMA
-  effective loss (dB):  21.17
-  pch out (dBm):        -20.00
+  effective loss (dB):     21.17
+  reference pch out (dBm): -20.00
+  actual pch out (dBm):    -20.00
 Transceiver trx Lorient_KMA
-  GSNR (0.1nm, dB):          23.94
+  GSNR (0.1nm, dB):          23.93
  GSNR (signal bw, dB):      19.85
  OSNR ASE (0.1nm, dB):      24.29
  OSNR ASE (signal bw, dB):  20.20
  CD (ps/nm):                2171.00
  PMD (ps):                  0.46
  PDL (dB):                  0.00
+  Latency (ms):              0.64

 Transmission result for input power = 3.00 dBm:
-  Final GSNR (0.1 nm): [1;36;40m23.94 dB[0m
+  Final GSNR (0.1 nm): [1;36;40m23.93 dB[0m

 (Invalid source node 'lannion' replaced with trx Lannion_CAS)

--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1 +1,7 @@
-pytest>=6.2.5,<7
+build>=1.0.3,<2
+pytest>=7.4.3,<8
+# pandas 2.1 removed support for Python 3.8
+pandas>=2.0.3,<3
+
+# flake v6 killed the --diff option
+flake8>=5.0.4,<6
--- a/tests/test_amplifier.py
+++ b/tests/test_amplifier.py
@@ -6,7 +6,7 @@
 from numpy import zeros, array
 from gnpy.core.elements import Transceiver, Edfa
 from gnpy.core.utils import automatic_fmax, lin2db, db2lin, merge_amplifier_restrictions
-from gnpy.core.info import create_input_spectral_information, Pref
+from gnpy.core.info import create_input_spectral_information, ReferenceCarrier
 from gnpy.core.network import build_network
 from gnpy.tools.json_io import load_network, load_equipment
 from pathlib import Path
@@ -73,7 +73,9 @@ def si(nch_and_spacing, bw):
    nb_channel, spacing = nch_and_spacing
    f_min = 191.3e12
    f_max = automatic_fmax(f_min, spacing, nb_channel)
-    return create_input_spectral_information(f_min, f_max, 0.15, bw, 1e-3, spacing)
+    return create_input_spectral_information(f_min=f_min, f_max=f_max, roll_off=0.15, baud_rate=bw, power=1e-3,
+                                             spacing=spacing, tx_osnr=40.0,
+                                             ref_carrier=ReferenceCarrier(baud_rate=32e9, slot_width=50e9))


@pytest.mark.parametrize("gain, nf_expected", [(10, 15), (15, 10), (25, 5.8)])
@@ -84,7 +86,7 @@ def test_variable_gain_nf(gain, nf_expected, setup_edfa_variable_gain, si):
    si.nli /= db2lin(gain)
    si.ase /= db2lin(gain)
    edfa.operational.gain_target = gain
-    si.pref = si.pref._replace(p_span0=0, p_spani=-gain, neq_ch=lin2db(si.number_of_channels))
+    si.pref = si.pref._replace(p_span0=0, p_spani=-gain)
    edfa.interpol_params(si)
    result = edfa.nf
    assert pytest.approx(nf_expected, abs=0.01) == result[0]
@@ -98,7 +100,7 @@ def test_fixed_gain_nf(gain, nf_expected, setup_edfa_fixed_gain, si):
    si.nli /= db2lin(gain)
    si.ase /= db2lin(gain)
    edfa.operational.gain_target = gain
-    si.pref = si.pref._replace(p_span0=0, p_spani=-gain, neq_ch=lin2db(si.number_of_channels))
+    si.pref = si.pref._replace(p_span0=0, p_spani=-gain)
    edfa.interpol_params(si)
    assert pytest.approx(nf_expected, abs=0.01) == edfa.nf[0]

@@ -113,7 +115,7 @@ def test_si(si, nch_and_spacing):

@pytest.mark.parametrize("gain", [17, 19, 21, 23])
 def test_compare_nf_models(gain, setup_edfa_variable_gain, si):
-    """ compare the 2 amplifier models (polynomial and estimated from nf_min and max)
+    """compare the 2 amplifier models (polynomial and estimated from nf_min and max)
     => nf_model vs nf_poly_fit for intermediate gain values:
     between gain_min and gain_flatmax some discrepancy is expected but target < 0.5dB
     => unitary test for Edfa._calc_nf (and Edfa.interpol_params)"""
@@ -123,7 +125,7 @@ def test_compare_nf_models(gain, setup_edfa_variable_gain, si):
    si.ase /= db2lin(gain)
    edfa.operational.gain_target = gain
    # edfa is variable gain type
-    si.pref = si.pref._replace(p_span0=0, p_spani=-gain, neq_ch=lin2db(si.number_of_channels))
+    si.pref = si.pref._replace(p_span0=0, p_spani=-gain)
    edfa.interpol_params(si)
    nf_model = edfa.nf[0]

@@ -178,7 +180,7 @@ def test_ase_noise(gain, si, setup_trx, bw):
    si = span(si)
    print(span)

-    si.pref = si.pref._replace(p_span0=0, p_spani=-gain, neq_ch=lin2db(si.number_of_channels))
+    si.pref = si.pref._replace(p_span0=0, p_spani=-gain)
    edfa.interpol_params(si)
    nf = edfa.nf
    print('nf', nf)
--- a/tests/test_disjunction.py
+++ b/tests/test_disjunction.py
@@ -4,12 +4,12 @@
 # License: BSD 3-Clause Licence
 # Copyright (c) 2018, Telecom Infra Project

-'''
+"""
@author: esther.lerouzic
 checks that computed paths are disjoint as specified in the json service file
 that computed paths do not loop
 that include node constraints are correctly taken into account
-'''
+"""

 from pathlib import Path
 import pytest
@@ -19,7 +19,7 @@ from gnpy.core.exceptions import ServiceError, DisjunctionError
 from gnpy.core.utils import automatic_nch, lin2db
 from gnpy.core.elements import Roadm
 from gnpy.topology.request import (compute_path_dsjctn, isdisjoint, find_reversed_path, PathRequest,
-                                   correct_json_route_list)
+                                   correct_json_route_list, requests_aggregation, Disjunction)
 from gnpy.topology.spectrum_assignment import build_oms_list
 from gnpy.tools.json_io import requests_from_json, load_requests, load_network, load_equipment, disjunctions_from_json

@@ -31,8 +31,7 @@ EQPT_LIBRARY_NAME = Path(__file__).parent.parent / 'tests/data/eqpt_config.json'

@pytest.fixture()
 def serv(test_setup):
-    ''' common setup for service list
-    '''
+    """common setup for service list"""
    network, equipment = test_setup
    data = load_requests(SERVICE_FILE_NAME, equipment, bidir=False, network=network, network_filename=NETWORK_FILE_NAME)
    rqs = requests_from_json(data, equipment)
@@ -43,8 +42,7 @@ def serv(test_setup):

@pytest.fixture()
 def test_setup():
-    ''' common setup for tests: builds network, equipment and oms only once
-    '''
+    """common setup for tests: builds network, equipment and oms only once"""
    equipment = load_equipment(EQPT_LIBRARY_NAME)
    network = load_network(NETWORK_FILE_NAME, equipment)
    # Build the network once using the default power defined in SI in eqpt config
@@ -61,9 +59,10 @@ def test_setup():


 def test_disjunction(serv):
-    ''' service_file contains sevaral combination of disjunction constraint. The test checks
-        that computed paths with disjunction constraint are effectively disjoint
-    '''
+    """service_file contains sevaral combination of disjunction constraint
+
+    The test checks that computed paths with disjunction constraint are effectively disjoint.
+    """
    network, equipment, rqs, dsjn = serv
    pths = compute_path_dsjctn(network, equipment, rqs, dsjn)
    print(dsjn)
@@ -86,8 +85,7 @@ def test_disjunction(serv):


 def test_does_not_loop_back(serv):
-    ''' check that computed paths do not loop back ie each element appears only once
-    '''
+    """check that computed paths do not loop back ie each element appears only once"""
    network, equipment, rqs, dsjn = serv
    pths = compute_path_dsjctn(network, equipment, rqs, dsjn)
    test = True
@@ -108,8 +106,7 @@ def test_does_not_loop_back(serv):


 def create_rq(equipment, srce, dest, bdir, node_list, loose_list, rqid='test_request'):
-    ''' create the usual request list according to parameters
-    '''
+    """create the usual request list according to parameters"""
    requests_list = []
    params = {
        'request_id': rqid,
@@ -151,19 +148,20 @@ def create_rq(equipment, srce, dest, bdir, node_list, loose_list, rqid='test_req
    ['trx a', 'trx h', 'pass', 'found_path', ['trx h'], ['STRICT']],
    ['trx a', 'trx h', 'pass', 'found_path', ['roadm a'], ['STRICT']]])
 def test_include_constraints(test_setup, srce, dest, result, pth, node_list, loose_list):
-    ''' check that all combinations of constraints are correctly handled:
-        - STRICT/LOOSE
-        - correct names/incorrect names -> pass/fail
-        - possible include/impossible include
-        if incorrect name -> fail
-        else:
-                                      constraint    |one or more STRICT | all LOOSE
-            ----------------------------------------------------------------------------------
-            >1 path from s to d | can be applied    | found_path        | found_path
-                                | cannot be applied | no_path           | found_path
-            ----------------------------------------------------------------------------------
-            0                   |                   |          computation stops
-    '''
+    """check that all combinations of constraints are correctly handled:
+
+    - STRICT/LOOSE
+    - correct names/incorrect names -> pass/fail
+    - possible include/impossible include
+    if incorrect name -> fail
+    else:
+                                  constraint    |one or more STRICT | all LOOSE
+        ----------------------------------------------------------------------------------
+        >1 path from s to d | can be applied    | found_path        | found_path
+                            | cannot be applied | no_path           | found_path
+        ----------------------------------------------------------------------------------
+        0                   |                   |          computation stops
+    """
    network, equipment = test_setup
    dsjn = []
    bdir = False
@@ -201,7 +199,7 @@ def test_include_constraints(test_setup, srce, dest, result, pth, node_list, loo
      ['roadm c', 'roadm f'],
      ['roadm a', 'roadm b', 'roadm f', 'roadm h']]]])
 def test_create_disjunction(test_setup, dis1, dis2, node_list1, loose_list1, result, expected_paths):
-    """ verifies that the expected result is obtained for a set of particular constraints:
+    """verifies that the expected result is obtained for a set of particular constraints:
    in particular, verifies that:
    - multiple disjunction constraints are correcly handled
    - in case a loose constraint can not be met, the first alternate candidate is selected
@@ -242,3 +240,91 @@ def test_create_disjunction(test_setup, dis1, dis2, node_list1, loose_list1, res
            path_names.append(roadm_names)
        assert path_names == expected_paths
        # if loose, one path can be returned
+
+
+@pytest.fixture()
+def request_set():
+    """ creates default request dict
+    """
+    return {
+        # 'request_id': '0',
+        'source': 'trx a',
+        'bidir': False,
+        'destination': 'trx g',
+        'trx_type': 'Voyager',
+        'spacing': 50e9,
+        'nodes_list': [],
+        'loose_list': [],
+        'f_min': 191.1e12,
+        'f_max': 196.3e12,
+        'nb_channel': None,
+        'power': 0,
+        'path_bandwidth': 200e9}
+
+
+@pytest.mark.parametrize(
+    'ids, modes, req_n, req_m, disjunction, final_ids, final_ns, final_ms, final_path_bandwidths',
+    # requests that should be correctly aggregated:
+    [(['a', 'b', 'c', 'd'], ['mode 1', 'mode 1', 'mode 1', 'mode 1'],
+      [[0], [16], [32], [48]], [[8], [8], [8], [8]], [[]],
+      ['d | c | b | a'], [[48, 32, 16, 0]], [[8, 8, 8, 8]], [800e9]),
+     (['a', 'b', 'c', 'd'], ['mode 1', 'mode 1', 'mode 1', 'mode 1'],
+      [[0, 8], [16, 24], [32, 40], [48]], [[4, 4], [4, 4], [4, 4], [8]], [[]],
+      ['d | c | b | a'], [[48, 32, 40, 16, 24, 0, 8]], [[8, 4, 4, 4, 4, 4, 4]], [800e9]),
+     (['a', 'b', 'c', 'd'], ['mode 1', 'mode 1', 'mode 1', 'mode 1'],
+      [[0, 8], [None, 24], [32, 40], [None]], [[4, 4], [4, 4], [4, 4], [None]], [[]],
+      ['d | c | b | a'], [[None, 32, 40, None, 24, 0, 8]], [[None, 4, 4, 4, 4, 4, 4]], [800e9]),
+     # 'a' and 'b' have same constraint and can be aggregated
+     (['a', 'b', 'c', 'd'], ['mode 1', 'mode 1', 'mode 1', 'mode 1'],
+      [[0], [16], [32], [48]], [[8], [8], [8], [8]], [['c', 'd']],
+      ['b | a', 'c', 'd'], [[16, 0], [32], [48]], [[8, 8], [8], [8]], [400e9, 200e9, 200e9]),
+     (['a', 'b', 'c', 'd'], ['mode 1', 'mode 1', 'mode 1', 'mode 1'],
+      [[0], [16], [32], [48]], [[8], [8], [8], [8]], [['a', 'd'], ['b', 'd']],
+      ['b | a', 'c', 'd'], [[16, 0], [32], [48]], [[8, 8], [8], [8]], [400e9, 200e9, 200e9]),
+     # requests that should not be aggregated:
+     (['a', 'b', 'c', 'd'], [None, None, None, 'mode 1'],
+      [[0, 8], [None, 24], [32, 40], [None]], [[4, 4], [4, 4], [4, 4], [None]], [[]],
+      ['a', 'b', 'c', 'd'], [[0, 8], [None, 24], [32, 40], [None]], [[4, 4], [4, 4], [4, 4], [None]],
+      [200e9, 200e9, 200e9, 200e9]),
+     (['a', 'b', 'c', 'd'], ['mode 1', 'mode 1', 'mode 1', 'mode 1'],
+      [[0], [16], [32], [48]], [[8], [8], [8], [8]], [['c', 'd', 'a']],
+      ['a', 'b', 'c', 'd'], [[0], [16], [32], [48]], [[8], [8], [8], [8]], [200e9, 200e9, 200e9, 200e9]), ])
+def test_aggregation(ids, modes, req_n, req_m, disjunction, final_ids, final_ns, final_ms, final_path_bandwidths,
+                     request_set):
+    """ tests that identical requests are correctly aggregated (included frequency slots merging)
+    if mode is not defined, requests must not be merged,
+    if requests are in a synchronization vector, they should not be merged
+    """
+    equipment = load_equipment(EQPT_LIBRARY_NAME)
+    requests = []
+    for request_id, mode, req_n, req_m in zip(ids, modes, req_n, req_m):
+        params = request_set
+        params['request_id'] = request_id
+        params['trx_mode'] = mode
+        params['effective_freq_slot'] = [{'N': n, 'M': m} for n, m in zip(req_n, req_m)]
+        trx_params = trx_mode_params(equipment, params['trx_type'], params['trx_mode'], True)
+        params.update(trx_params)
+        requests.append(PathRequest(**params))
+    params = {
+        'relaxable': False,
+        'link_diverse': True,
+        'node_diverse': True
+    }
+
+    disjunctions = []
+    i = 0
+    for vector in disjunction:
+        params['disjunctions_req'] = vector
+        params['disjunction_id'] = i
+        disjunctions.append(Disjunction(**params))
+        i += 1
+    requests, disjunctions = requests_aggregation(requests, disjunctions)
+    print(disjunctions)
+    print(requests)
+    i = 0
+    for final_id, final_n, final_m, final_path_bandwidth in zip(final_ids, final_ns, final_ms, final_path_bandwidths):
+        assert requests[i].request_id == final_id
+        assert requests[i].N == final_n
+        assert requests[i].M == final_m
+        assert requests[i].path_bandwidth == final_path_bandwidth
+        i += 1
--- a/tests/test_equalization.py
+++ b/tests/test_equalization.py
@@ -0,0 +1,837 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# @Author: Esther Le Rouzic
+# @Date:   2019-05-22
+"""
+@author: esther.lerouzic
+checks that new equalization option give the same output as old one:
+
+"""
+
+from pathlib import Path
+import pytest
+from numpy.testing import assert_allclose, assert_array_equal, assert_raises
+from numpy import array
+from copy import deepcopy
+
+from gnpy.core.utils import lin2db, automatic_nch, dbm2watt, power_dbm_to_psd_mw_ghz, watt2dbm, psd2powerdbm
+from gnpy.core.network import build_network
+from gnpy.core.elements import Roadm
+from gnpy.core.info import create_input_spectral_information, Pref, create_arbitrary_spectral_information, \
+    ReferenceCarrier
+from gnpy.core.equipment import trx_mode_params
+from gnpy.core.exceptions import ConfigurationError
+from gnpy.tools.json_io import network_from_json, load_equipment, load_network, _spectrum_from_json, load_json, \
+    Transceiver, requests_from_json
+from gnpy.topology.request import PathRequest, compute_constrained_path, propagate, propagate_and_optimize_mode
+
+
+TEST_DIR = Path(__file__).parent
+EQPT_FILENAME = TEST_DIR / 'data/eqpt_config.json'
+NETWORK_FILENAME = TEST_DIR / 'data/testTopology_expected.json'
+
+
+@pytest.mark.parametrize('degree, equalization_type, target, expected_pch_out_dbm, expected_si',
+    [('east edfa in Lannion_CAS to Morlaix', 'target_pch_out_db', -20, -20, [-20, -20, -20, -20, -20]),
+     ('east edfa in Lannion_CAS to Morlaix', 'target_psd_out_mWperGHz', 5e-4, -17.9588,
+      [-17.9588, -16.7778, -14.9485, -16.7778, -17.9588]),
+     ('east edfa in Lannion_CAS to Morlaix', 'target_out_mWperSlotWidth', 3e-4, -18.2390,
+      [-19.4885, -18.2390, -16.4781, -18.2390, -19.4885]),
+     ('east edfa in Lannion_CAS to Corlay', 'target_pch_out_db', -20, -16, [-16, -16, -16, -16, -16]),
+     ('east edfa in Lannion_CAS to Corlay', 'target_psd_out_mWperGHz', 5e-4, -16, [-16, -16, -16, -16, -16]),
+     ('east edfa in Lannion_CAS to Corlay', 'target_out_mWperSlotWidth', 5e-4, -16, [-16, -16, -16, -16, -16]),
+     ('east edfa in Lannion_CAS to Stbrieuc', 'target_pch_out_db', -20, -17.16699,
+      [-17.16698771, -15.98599459, -14.15668776, -15.98599459, -17.16698771]),
+     ('east edfa in Lannion_CAS to Stbrieuc', 'target_psd_out_mWperGHz', 5e-4, -17.16699,
+      [-17.16698771, -15.98599459, -14.15668776, -15.98599459, -17.16698771]),
+     ('east edfa in Lannion_CAS to Stbrieuc', 'target_out_mWperSlotWidth', 5e-4, -17.16699,
+      [-17.16698771, -15.98599459, -14.15668776, -15.98599459, -17.16698771])])
+@pytest.mark.parametrize('delta_pdb_per_channel', [[0, 0, 0, 0, 0], [1, 3, 0, -5, 0]])
+def test_equalization_combination_degree(delta_pdb_per_channel, degree, equalization_type, target,
+                                         expected_pch_out_dbm, expected_si):
+    """Check that ROADM correctly computes power of thr reference channel based on different
+    combination of equalization for ROADM and per degree
+    """
+
+    roadm_config = {
+        "uid": "roadm Lannion_CAS",
+        "params": {
+            "per_degree_pch_out_db": {
+                "east edfa in Lannion_CAS to Corlay": -16
+            },
+            "per_degree_psd_out_mWperGHz": {
+                "east edfa in Lannion_CAS to Stbrieuc": 6e-4
+            },
+            equalization_type: target,
+            "add_drop_osnr": 38,
+            "pmd": 0,
+            "pdl": 0,
+            "restrictions": {
+                "preamp_variety_list": [],
+                "booster_variety_list": []
+            }
+        }
+    }
+    roadm = Roadm(**roadm_config)
+    frequency = 191e12 + array([0, 50e9, 150e9, 225e9, 275e9])
+    slot_width = array([37.5e9, 50e9, 75e9, 50e9, 37.5e9])
+    baud_rate = array([32e9, 42e9, 64e9, 42e9, 32e9])
+    signal = dbm2watt(array([-20.0, -18.0, -22.0, -25.0, -16.0]))
+    ref_carrier = ReferenceCarrier(baud_rate=32e9, slot_width=50e9)
+    pref = Pref(p_span0=0, p_spani=0, ref_carrier=ref_carrier)
+    si = create_arbitrary_spectral_information(frequency=frequency, slot_width=slot_width,
+                                               signal=signal, baud_rate=baud_rate, roll_off=0.15,
+                                               delta_pdb_per_channel=delta_pdb_per_channel,
+                                               tx_osnr=None, ref_power=pref)
+    to_json_before_propagation = {
+        'uid': 'roadm Lannion_CAS',
+        'type': 'Roadm',
+        'params': {
+            equalization_type: target,
+            'restrictions': {'preamp_variety_list': [], 'booster_variety_list': []},
+            'per_degree_pch_out_db': {
+                'east edfa in Lannion_CAS to Corlay': -16},
+            "per_degree_psd_out_mWperGHz": {
+                "east edfa in Lannion_CAS to Stbrieuc": 6e-4
+            }
+        },
+        'metadata': {'location': {'latitude': 0, 'longitude': 0, 'city': None, 'region': None}}
+    }
+    assert roadm.to_json == to_json_before_propagation
+    si = roadm(si, degree)
+    assert roadm.ref_pch_out_dbm == pytest.approx(expected_pch_out_dbm, rel=1e-4)
+    assert_allclose(expected_si, roadm.get_per_degree_power(degree, spectral_info=si), rtol=1e-3)
+
+
+@pytest.mark.parametrize('equalization_type', ["target_psd_out_mWperGHz", "target_out_mWperSlotWidth"])
+def test_wrong_element_config(equalization_type):
+    """Check that 2 equalization correcty raise a config error
+    """
+    roadm_config = {
+        "uid": "roadm Brest_KLA",
+        "params": {
+            "per_degree_pch_out_db": {},
+            "target_pch_out_db": -20,
+            equalization_type: 3.125e-4,
+            "add_drop_osnr": 38,
+            "pmd": 0,
+            "pdl": 0,
+            "restrictions": {
+                "preamp_variety_list": [],
+                "booster_variety_list": []
+            }
+        },
+        "metadata": {
+            "location": {
+                "city": "Brest_KLA",
+                "region": "RLD",
+                "latitude": 4.0,
+                "longitude": 0.0
+            }
+        }
+    }
+    with pytest.raises(ConfigurationError):
+        _ = Roadm(**roadm_config)
+
+
+def test_merge_equalization():
+    """Check that if equalization is not defined default one is correctly take and
+    else that it is not overwritten
+    """
+    json_data = {
+        "elements": [{
+            "uid": "roadm Brest_KLA",
+            "type": "Roadm"}],
+        "connections": []
+    }
+    equipment = load_equipment(EQPT_FILENAME)
+    network = network_from_json(json_data, equipment)
+    roadm = [n for n in network.nodes()][0]
+    assert roadm.target_pch_out_dbm == -20
+    delattr(equipment['Roadm']['default'], 'target_pch_out_db')
+    setattr(equipment['Roadm']['default'], 'target_psd_out_mWperGHz', power_dbm_to_psd_mw_ghz(-20, 32e9))
+    # json_data is changed (type is popped from json_data with network_from_json_function). Create a new one:
+    json_data = {
+        "elements": [{
+            "uid": "roadm Brest_KLA",
+            "type": "Roadm"}],
+        "connections": []
+    }
+    network = network_from_json(json_data, equipment)
+    roadm = [n for n in network.nodes()][0]
+    assert roadm.target_pch_out_dbm is None
+    assert roadm.target_psd_out_mWperGHz == 3.125e-4
+    assert roadm.target_out_mWperSlotWidth is None
+    json_data = {
+        "elements": [{
+            "uid": "roadm Brest_KLA",
+            "type": "Roadm",
+            "params": {"target_pch_out_db": -18}}],
+        "connections": []
+    }
+    network = network_from_json(json_data, equipment)
+    roadm = [n for n in network.nodes()][0]
+    assert roadm.target_pch_out_dbm == -18
+    assert roadm.target_psd_out_mWperGHz is None
+    assert roadm.target_out_mWperSlotWidth is None
+    json_data = {
+        "elements": [{
+            "uid": "roadm Brest_KLA",
+            "type": "Roadm",
+            "params": {"target_psd_out_mWperGHz": 5e-4}}],
+        "connections": []
+    }
+    network = network_from_json(json_data, equipment)
+    roadm = [n for n in network.nodes()][0]
+    assert roadm.target_pch_out_dbm is None
+    assert roadm.target_psd_out_mWperGHz == 5e-4
+    assert roadm.target_out_mWperSlotWidth is None
+    json_data = {
+        "elements": [{
+            "uid": "roadm Brest_KLA",
+            "type": "Roadm",
+            "params": {"target_out_mWperSlotWidth": 3e-4}}],
+        "connections": []
+    }
+    network = network_from_json(json_data, equipment)
+    roadm = [n for n in network.nodes()][0]
+    assert roadm.target_pch_out_dbm is None
+    assert roadm.target_psd_out_mWperGHz is None
+    assert roadm.target_out_mWperSlotWidth == 3e-4
+
+
+@pytest.mark.parametrize('target_out, delta_pdb_per_channel, correction',
+                         [(-20, [0, 1, 3, 0.5, -2], [0, 0, 5, 5.5, 0]),
+                          (-20, [0, 0, 0, 0, 0], [0, 0, 2, 5, 0]),
+                          (-20, [-2, -2, -2, -2, -2], [0, 0, 0, 3, 0]),
+                          (-20, [0, 2, -2, -5, 4], [0, 0, 0, 0, 0]),
+                          (-25.5, [0, 1, 3, 0.5, -2], [0, 0, 0, 0, 0]), ])
+def test_low_input_power(target_out, delta_pdb_per_channel, correction):
+    """check that ROADM correctly equalizes on small examples, assumes p_span_0 = 0
+    case of power equalisation
+    """
+    frequency = 191e12 + array([0, 50e9, 150e9, 225e9, 275e9])
+    slot_width = array([37.5e9, 50e9, 75e9, 50e9, 37.5e9])
+    baud_rate = array([32e9, 42e9, 64e9, 42e9, 32e9])
+    signal = dbm2watt(array([-20.0, -18.0, -22.0, -25.0, -16.0]))
+    target = target_out + array(delta_pdb_per_channel)
+    ref_carrier = ReferenceCarrier(baud_rate=32e9, slot_width=50e9)
+    pref = Pref(p_span0=0, p_spani=-20, ref_carrier=ref_carrier)
+    si = create_arbitrary_spectral_information(frequency=frequency, slot_width=slot_width,
+                                               signal=signal, baud_rate=baud_rate, roll_off=0.15,
+                                               delta_pdb_per_channel=delta_pdb_per_channel,
+                                               tx_osnr=None, ref_power=pref)
+    roadm_config = {
+        "uid": "roadm Brest_KLA",
+        "params": {
+            "per_degree_pch_out_db": {},
+            "target_pch_out_db": target_out,
+            "add_drop_osnr": 38,
+            "pmd": 0,
+            "pdl": 0,
+            "restrictions": {
+                "preamp_variety_list": [],
+                "booster_variety_list": []
+            }
+        },
+        "metadata": {
+            "location": {
+                "city": "Brest_KLA",
+                "region": "RLD",
+                "latitude": 4.0,
+                "longitude": 0.0
+            }
+        }
+    }
+    roadm = Roadm(**roadm_config)
+    si = roadm(si, 'toto')
+    assert_allclose(watt2dbm(si.signal), target - correction, rtol=1e-5)
+    # in other words check that if target is below input power, target is applied else power is unchanged
+    assert_allclose((watt2dbm(signal) >= target) * target + (watt2dbm(signal) < target) * watt2dbm(signal),
+                    watt2dbm(si.signal), rtol=1e-5)
+
+
+@pytest.mark.parametrize('target_out, delta_pdb_per_channel, correction',
+                         [(3.125e-4,
+                           [0, 0, 0, 0, 0],
+                           [0, 0, 2 + lin2db(64 / 32), 5 + lin2db(42 / 32), 0]),
+                          (3.125e-4,
+                           [1, 3, 0, -5, 0],
+                           [1, 1 + lin2db(42 / 32), 2 + lin2db(64 / 32), 0 + lin2db(42 / 32), 0]), ])
+def test_2low_input_power(target_out, delta_pdb_per_channel, correction):
+    """check that ROADM correctly equalizes on small examples, assumes p_span_0 = 0
+    case of PSD equalisation
+    """
+    frequency = 191e12 + array([0, 50e9, 150e9, 225e9, 275e9])
+    slot_width = array([37.5e9, 50e9, 75e9, 50e9, 37.5e9])
+    baud_rate = array([32e9, 42e9, 64e9, 42e9, 32e9])
+    signal = dbm2watt(array([-20.0, -18.0, -22.0, -25.0, -16.0]))
+    target = psd2powerdbm(target_out, baud_rate) + array(delta_pdb_per_channel)
+    ref_carrier = ReferenceCarrier(baud_rate=32e9, slot_width=50e9)
+    pref = Pref(p_span0=0, p_spani=-20, ref_carrier=ref_carrier)
+    si = create_arbitrary_spectral_information(frequency=frequency, slot_width=slot_width,
+                                               signal=signal, baud_rate=baud_rate, roll_off=0.15,
+                                               delta_pdb_per_channel=delta_pdb_per_channel,
+                                               tx_osnr=None, ref_power=pref)
+    roadm_config = {
+        "uid": "roadm Brest_KLA",
+        "params": {
+            "per_degree_pch_out_db": {},
+            "target_psd_out_mWperGHz": target_out,
+            "add_drop_osnr": 38,
+            "pmd": 0,
+            "pdl": 0,
+            "restrictions": {
+                "preamp_variety_list": [],
+                "booster_variety_list": []
+            }
+        },
+        "metadata": {
+            "location": {
+                "city": "Brest_KLA",
+                "region": "RLD",
+                "latitude": 4.0,
+                "longitude": 0.0
+            }
+        }
+    }
+    roadm = Roadm(**roadm_config)
+    si = roadm(si, 'toto')
+    assert_allclose(watt2dbm(si.signal), target - correction, rtol=1e-5)
+
+
+def net_setup(equipment):
+    """common setup for tests: builds network, equipment and oms only once"""
+    network = load_network(NETWORK_FILENAME, equipment)
+    spectrum = equipment['SI']['default']
+    p_db = spectrum.power_dbm
+    p_total_db = p_db + lin2db(automatic_nch(spectrum.f_min, spectrum.f_max, spectrum.spacing))
+    build_network(network, equipment, p_db, p_total_db)
+    return network
+
+
+def create_voyager_req(equipment, source, dest, bidir, nodes_list, loose_list, mode, spacing, power_dbm):
+    """create the usual request list according to parameters"""
+    params = {'request_id': 'test_request',
+              'source': source,
+              'bidir': bidir,
+              'destination': dest,
+              'trx_type': 'Voyager',
+              'trx_mode': mode,
+              'format': mode,
+              'spacing': spacing,
+              'nodes_list': nodes_list,
+              'loose_list': loose_list,
+              'path_bandwidth': 100.0e9,
+              'effective_freq_slot': None}
+    trx_params = trx_mode_params(equipment, params['trx_type'], params['trx_mode'], True)
+    params.update(trx_params)
+    params['power'] = dbm2watt(power_dbm) if power_dbm else dbm2watt(equipment['SI']['default'].power_dbm)
+    f_min = params['f_min']
+    f_max_from_si = params['f_max']
+    params['nb_channel'] = automatic_nch(f_min, f_max_from_si, params['spacing'])
+    return PathRequest(**params)
+
+
+@pytest.mark.parametrize('power_dbm', [0, 1, -2, None])
+@pytest.mark.parametrize('mode, slot_width', (['mode 1', 50e9], ['mode 2', 75e9]))
+def test_initial_spectrum(mode, slot_width, power_dbm):
+    """checks that propagation using the user defined spectrum identical to SI, gives same result as SI"""
+    # first propagate without any req.initial_spectrum attribute
+    equipment = load_equipment(EQPT_FILENAME)
+    req = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Vannes_KBE', False, ['trx Vannes_KBE'], ['STRICT'],
+                             mode, slot_width, power_dbm)
+    network = net_setup(equipment)
+    path = compute_constrained_path(network, req)
+    infos_expected = propagate(path, req, equipment)
+    # then creates req.initial_spectrum attribute exactly corresponding to -spectrum option files
+    temp = [{
+        "f_min": 191.35e12 + slot_width,
+        "f_max": 196.15e12 - slot_width,
+        "baud_rate": req.baud_rate,
+        "slot_width": slot_width,
+        "roll_off": 0.15,
+        "tx_osnr": 40
+    }]
+    req.initial_spectrum = _spectrum_from_json(temp)
+    infos_actual = propagate(path, req, equipment)
+    print(infos_actual.frequency[0], infos_actual.frequency[-1])
+    print(infos_expected.frequency[0], infos_expected.frequency[-1])
+
+    assert_array_equal(infos_expected.frequency, infos_actual.frequency)
+    assert_array_equal(infos_expected.baud_rate, infos_actual.baud_rate)
+    assert_array_equal(infos_expected.slot_width, infos_actual.slot_width)
+    assert_array_equal(infos_expected.signal, infos_actual.signal)
+    assert_array_equal(infos_expected.nli, infos_actual.nli)
+    assert_array_equal(infos_expected.ase, infos_actual.ase)
+    assert_array_equal(infos_expected.roll_off, infos_actual.roll_off)
+    assert_array_equal(infos_expected.chromatic_dispersion, infos_actual.chromatic_dispersion)
+    assert_array_equal(infos_expected.pmd, infos_actual.pmd)
+    assert_array_equal(infos_expected.channel_number, infos_actual.channel_number)
+    assert_array_equal(infos_expected.number_of_channels, infos_actual.number_of_channels)
+
+
+def test_initial_spectrum_not_identical():
+    """checks that user defined spectrum overrides spectrum defined in SI
+    """
+    # first propagate without any req.initial_spectrum attribute
+    equipment = load_equipment(EQPT_FILENAME)
+    req = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Vannes_KBE', False, ['trx Vannes_KBE'], ['STRICT'],
+                             'mode 1', 50e9, 0)
+    network = net_setup(equipment)
+    path = compute_constrained_path(network, req)
+    infos_expected = propagate(path, req, equipment)
+    # then creates req.initial_spectrum attribute exactly corresponding to -spectrum option files
+    temp = [{
+        "f_min": 191.4e12,     # align f_min , f_max on Voyager f_min, f_mix and not SI !
+        "f_max": 196.1e12,
+        "baud_rate": 40e9,
+        "slot_width": 62.5e9,
+        "roll_off": 0.15,
+        "tx_osnr": 40
+    }]
+    req.initial_spectrum = _spectrum_from_json(temp)
+    infos_actual = propagate(path, req, equipment)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.frequency, infos_actual.frequency)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.baud_rate, infos_actual.baud_rate)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.slot_width, infos_actual.slot_width)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.signal, infos_actual.signal)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.nli, infos_actual.nli)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.ase, infos_actual.ase)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.channel_number, infos_actual.channel_number)
+    assert_raises(AssertionError, assert_array_equal, infos_expected.number_of_channels, infos_actual.number_of_channels)
+
+
+@pytest.mark.parametrize('equalization, target_value', [
+    ('target_out_mWperSlotWidth', power_dbm_to_psd_mw_ghz(-20, 50e9)),
+    ('target_psd_out_mWperGHz', power_dbm_to_psd_mw_ghz(-20, 32e9))])
+@pytest.mark.parametrize('power_dbm', [0, 2, -0.5])
+def test_target_psd_or_psw(power_dbm, equalization, target_value):
+    """checks that if target_out_mWperSlotWidth or target_psd_out_mWperGHz is defined, it is used as equalization
+    and it gives same result if computed target is the same
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    network = net_setup(equipment)
+    req = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Vannes_KBE', False, ['trx Vannes_KBE'], ['STRICT'],
+                             'mode 1', 50e9, power_dbm)
+    path = compute_constrained_path(network, req)
+    infos_expected = propagate(path, req, equipment)
+    # change default equalization to power spectral density
+    delattr(equipment['Roadm']['default'], 'target_pch_out_db')
+    setattr(equipment['Roadm']['default'], equalization, target_value)
+    # create a second instance with this roadm settings,
+    network2 = net_setup(equipment)
+    path2 = compute_constrained_path(network2, req)
+    infos_actual = propagate(path2, req, equipment)
+    # since baudrate is the same, resulting propagation should be the same as for power equalization
+    assert_array_equal(infos_expected.baud_rate, infos_actual.baud_rate)
+    assert_array_equal(infos_expected.slot_width, infos_actual.slot_width)
+    assert_array_equal(infos_expected.signal, infos_actual.signal)
+    assert_array_equal(infos_expected.nli, infos_actual.nli)
+    assert_array_equal(infos_expected.ase, infos_actual.ase)
+    assert_array_equal(infos_expected.roll_off, infos_actual.roll_off)
+    assert_array_equal(infos_expected.chromatic_dispersion, infos_actual.chromatic_dispersion)
+    assert_array_equal(infos_expected.pmd, infos_actual.pmd)
+    assert_array_equal(infos_expected.channel_number, infos_actual.channel_number)
+    assert_array_equal(infos_expected.number_of_channels, infos_actual.number_of_channels)
+
+
+def ref_network():
+    """Create a network instance with a instance of propagated path"""
+    equipment = load_equipment(EQPT_FILENAME)
+    network = net_setup(equipment)
+    req0 = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Vannes_KBE', False, ['trx Vannes_KBE'], ['STRICT'],
+                              'mode 1', 50e9, 0)
+    path0 = compute_constrained_path(network, req0)
+    _ = propagate(path0, req0, equipment)
+    return network
+
+
+@pytest.mark.parametrize('deltap', [0, +1.2, -0.5])
+def test_target_psd_out_mwperghz_deltap(deltap):
+    """checks that if target_psd_out_mWperGHz is defined, delta_p of amps is correctly updated
+
+    Power over 1.2dBm saturate amp with this test: TODO add a test on this saturation
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    network = net_setup(equipment)
+    req = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Vannes_KBE', False, ['trx Vannes_KBE'], ['STRICT'],
+                             'mode 1', 50e9, deltap)
+    temp = [{
+        "f_min": 191.35e12,     # align f_min , f_max on Voyager f_min, f_mix and not SI !
+        "f_max": 196.05e12,
+        "baud_rate": req.baud_rate,
+        "slot_width": 50e9,
+        "roll_off": 0.15,
+        "tx_osnr": 40
+    }]
+    req.initial_spectrum = _spectrum_from_json(temp)
+    path = compute_constrained_path(network, req)
+    _ = propagate(path, req, equipment)
+    # check that gain of booster is changed accordingly whereas gain of preamp and ila is not (no saturation case)
+    boosters = ['east edfa in Brest_KLA to Quimper', 'east edfa in Lorient_KMA to Vannes_KBE']
+    ila_preamps = ['east edfa in Quimper to Lorient_KMA', 'west edfa in Lorient_KMA to Quimper',
+                   'west edfa in Vannes_KBE to Lorient_KMA']
+    for amp in boosters + ila_preamps:
+        expected_amp = next(n for n in ref_network() if n.uid == amp)
+        actual_amp = next(n for n in network.nodes() if n.uid == amp)
+        expected_gain = expected_amp.pout_db - expected_amp.pin_db
+        actual_gain = actual_amp.pout_db - actual_amp.pin_db
+        print(actual_amp)
+        if amp in boosters:
+            assert expected_gain + deltap == pytest.approx(actual_gain, rel=1e-3)
+        if amp in ila_preamps:
+            assert expected_gain == pytest.approx(actual_gain, rel=1e-3)
+
+
+@pytest.mark.parametrize('equalization', ['target_psd_out_mWperGHz', 'target_out_mWperSlotWidth'])
+@pytest.mark.parametrize('case', ['SI', 'nodes'])
+@pytest.mark.parametrize('deltap', [0, +2, -0.5])
+@pytest.mark.parametrize('target', [-20, -21, -18])
+@pytest.mark.parametrize('mode, slot_width', (['mode 1', 50e9], ['mode 2', 75e9]))
+def test_equalization(case, deltap, target, mode, slot_width, equalization):
+    """check that power target on roadm is correct for these cases; check on booster
+    - SI : target_pch_out_db / target_psd_out_mWperGHz
+    - node : target_pch_out_db / target_psd_out_mWperGHz
+    - per degree : target_pch_out_db / target_psd_out_mWperGHz
+    for these cases with and without power from user
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    setattr(equipment['Roadm']['default'], 'target_pch_out_db', target)
+    req = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Rennes_STA', False,
+                             ['east edfa in Brest_KLA to Quimper', 'roadm Lannion_CAS', 'trx Rennes_STA'],
+                             ['STRICT', 'STRICT', 'STRICT'],
+                             mode, slot_width, deltap)
+    roadms = ['roadm Brest_KLA', 'roadm Lorient_KMA', 'roadm Lannion_CAS', 'roadm Rennes_STA']
+    # degree = {'roadm Brest_KLA': 'east edfa in Brest_KLA to Quimper',
+    #           'roadm Lorient_KMA': 'east edfa in Lorient_KMA to Loudeac'}
+    # boosters = ['east edfa in Brest_KLA to Quimper', 'east edfa in Lorient_KMA to Loudeac',
+    #             'east edfa in Lannion_CAS to Stbrieuc']
+    target_psd = power_dbm_to_psd_mw_ghz(target, 32e9)
+    ref = ReferenceCarrier(baud_rate=32e9, slot_width=50e9)
+    if case == 'SI':
+        delattr(equipment['Roadm']['default'], 'target_pch_out_db')
+        setattr(equipment['Roadm']['default'], equalization, target_psd)
+        network = net_setup(equipment)
+    elif case == 'nodes':
+        json_data = load_json(NETWORK_FILENAME)
+        for el in json_data['elements']:
+            if el['uid'] in roadms:
+                el['params'] = {equalization: target_psd}
+        network = network_from_json(json_data, equipment)
+        spectrum = equipment['SI']['default']
+        p_db = spectrum.power_dbm
+        p_total_db = p_db + lin2db(automatic_nch(spectrum.f_min, spectrum.f_max, spectrum.spacing))
+        build_network(network, equipment, p_db, p_total_db)
+        # check that nodes not in roadms have target_pch_out_db not None
+        pw_roadms = [r for r in network.nodes() if r.uid not in roadms and isinstance(r, Roadm)]
+        for roadm in pw_roadms:
+            assert roadm.target_psd_out_mWperGHz is None
+            assert roadm.target_pch_out_dbm == target
+        for roadm in [r for r in network.nodes() if r.uid in roadms and isinstance(r, Roadm)]:
+            assert roadm.target_pch_out_dbm is None
+            assert getattr(roadm, equalization) == target_psd
+    path = compute_constrained_path(network, req)
+    si = create_input_spectral_information(
+        f_min=req.f_min, f_max=req.f_max, roll_off=req.roll_off, baud_rate=req.baud_rate, power=req.power,
+        spacing=req.spacing, tx_osnr=req.tx_osnr, ref_carrier=ref)
+    for i, el in enumerate(path):
+        if isinstance(el, Roadm):
+            si = el(si, degree=path[i + 1].uid)
+            if case in ['SI', 'nodes', 'degrees']:
+                if equalization == 'target_psd_out_mWperGHz':
+                    assert_allclose(power_dbm_to_psd_mw_ghz(watt2dbm(si.signal + si.ase + si.nli), si.baud_rate),
+                                    target_psd, rtol=1e-3)
+                if equalization == 'target_out_mWperSlotWidth':
+                    assert_allclose(power_dbm_to_psd_mw_ghz(watt2dbm(si.signal + si.ase + si.nli), si.slot_width),
+                                    target_psd, rtol=1e-3)
+        else:
+            si = el(si)
+        print(el.uid)
+
+
+@pytest.mark.parametrize('req_power', [0, 2, -1.5])
+def test_power_option(req_power):
+    """check that --po option adds correctly power with spectral information
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    setattr(equipment['Roadm']['default'], 'target_pch_out_db', None)
+    setattr(equipment['Roadm']['default'], 'target_psd_out_mWperGHz', power_dbm_to_psd_mw_ghz(-20, 32e9))
+    network = net_setup(equipment)
+    req = create_voyager_req(equipment, 'trx Brest_KLA', 'trx Vannes_KBE', False, ['trx Vannes_KBE'], ['STRICT'],
+                             'mode 1', 50e9, req_power)
+    path = compute_constrained_path(network, req)
+    infos_expected = propagate(path, req, equipment)
+
+    temp = [{
+        "f_min": 191.4e12,     # align f_min , f_max on Voyager f_min, f_max and not SI !
+        "f_max": 196.1e12,
+        "baud_rate": req.baud_rate,
+        "slot_width": 50e9,
+        "roll_off": 0.15,
+        "tx_osnr": 40
+    }]
+    req.initial_spectrum = _spectrum_from_json(temp)
+    network2 = net_setup(equipment)
+    path2 = compute_constrained_path(network2, req)
+    infos_actual = propagate(path2, req, equipment)
+    assert_array_equal(infos_expected.baud_rate, infos_actual.baud_rate)
+    assert_array_equal(infos_expected.slot_width, infos_actual.slot_width)
+    assert_array_equal(infos_expected.signal, infos_actual.signal)
+    assert_array_equal(infos_expected.nli, infos_actual.nli)
+    assert_array_equal(infos_expected.ase, infos_actual.ase)
+    assert_array_equal(infos_expected.roll_off, infos_actual.roll_off)
+    assert_array_equal(infos_expected.chromatic_dispersion, infos_actual.chromatic_dispersion)
+    assert_array_equal(infos_expected.pmd, infos_actual.pmd)
+    assert_array_equal(infos_expected.channel_number, infos_actual.channel_number)
+    assert_array_equal(infos_expected.number_of_channels, infos_actual.number_of_channels)
+
+
+def transceiver(slot_width, value):
+    return {
+        "type_variety": "test_offset",
+        "frequency": {
+            "min": 191.3e12,
+            "max": 196.1e12
+        },
+        "mode": [
+            {
+                "format": "mode 1",
+                "baud_rate": 64e9,
+                "OSNR": 18,
+                "bit_rate": 100e9,
+                "roll_off": 0.15,
+                "tx_osnr": 40,
+                "min_spacing": 75e9,
+                "cost": 1
+            },
+            {
+                "format": "mode 3",
+                "baud_rate": 64e9,
+                "OSNR": 18,
+                "bit_rate": 100e9,
+                "roll_off": 0.15,
+                "tx_osnr": 40,
+                "min_spacing": slot_width,
+                "equalization_offset_db": value,
+                "cost": 1
+            }
+        ]
+    }
+
+
+def some_requests():
+    route = {
+        "route-object-include-exclude": [
+            {
+                "explicit-route-usage": "route-include-ero",
+                "index": 0,
+                "num-unnum-hop": {
+                    "node-id": "trx Brest_KLA",
+                    "link-tp-id": "link-tp-id is not used",
+                    "hop-type": "STRICT"
+                }
+            },
+            {
+                "explicit-route-usage": "route-include-ero",
+                "index": 1,
+                "num-unnum-hop": {
+                    "node-id": "trx Vannes_KBE",
+                    "link-tp-id": "link-tp-id is not used",
+                    "hop-type": "STRICT"
+                }
+            }
+        ]
+    }
+    return {
+        "path-request": [{
+            "request-id": "2",
+            "source": "trx Brest_KLA",
+            "destination": "trx Vannes_KBE",
+            "src-tp-id": "trx Brest_KLA",
+            "dst-tp-id": "trx Vannes_KBE",
+            "bidirectional": False,
+            "path-constraints": {
+                "te-bandwidth": {
+                    "technology": "flexi-grid",
+                    "trx_type": "test_offset",
+                    "trx_mode": "mode 1",
+                    "spacing": 75000000000.0,
+                    "path_bandwidth": 100000000000.0
+                }
+            },
+            "explicit-route-objects": route
+        }, {
+            "request-id": "3",
+            "source": "trx Brest_KLA",
+            "destination": "trx Vannes_KBE",
+            "src-tp-id": "trx Brest_KLA",
+            "dst-tp-id": "trx Vannes_KBE",
+            "bidirectional": False,
+            "path-constraints": {
+                "te-bandwidth": {
+                    "technology": "flexi-grid",
+                    "trx_type": "test_offset",
+                    "trx_mode": "mode 3",
+                    "spacing": 87500000000.0,
+                    "path_bandwidth": 100000000000.0
+                }
+            },
+            "explicit-route-objects": route
+        }, {
+            "request-id": "4",
+            "source": "trx Brest_KLA",
+            "destination": "trx Vannes_KBE",
+            "src-tp-id": "trx Brest_KLA",
+            "dst-tp-id": "trx Vannes_KBE",
+            "bidirectional": False,
+            "path-constraints": {
+                "te-bandwidth": {
+                    "technology": "flexi-grid",
+                    "trx_type": "test_offset",
+                    "trx_mode": "mode 1",
+                    "spacing": 87500000000.0,
+                    "path_bandwidth": 100000000000.0
+                }
+            },
+            "explicit-route-objects": route
+        }]
+    }
+
+
+@pytest.mark.parametrize('slot_width, value', [(75e9, lin2db(75 / 87.5)),
+                                               (87.5e9, lin2db(75 / 87.5))])
+def test_power_offset_trx_equalization_psw(slot_width, value):
+    """Check that the equalization with the offset is giving the same result as with reference slot_width
+    Check that larger slot width but no offset takes larger slot width for equalization
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    trx = transceiver(slot_width, value)
+    equipment['Transceiver'][trx['type_variety']] = Transceiver(**trx)
+    setattr(equipment['Roadm']['default'], 'target_pch_out_db', None)
+    setattr(equipment['Roadm']['default'], 'target_out_mWperSlotWidth', power_dbm_to_psd_mw_ghz(-20, 50e9))
+    network = net_setup(equipment)
+    json_data = some_requests()
+    ref_request, request, other = requests_from_json(json_data, equipment)
+    # ref_request (_expected) has no offset, equalization on 75GH basis
+    path_expected = compute_constrained_path(network, ref_request)
+    _ = propagate(path_expected, ref_request, equipment)
+    roadm1_expected = deepcopy(path_expected[1])
+    # request has an offset either defined in power and a larger slot width.
+    # The defined offset is "equalize as if it was a 75 GHz channel" although slot_width is 87.5GHz
+    path = compute_constrained_path(network, request)
+    _ = propagate(path, request, equipment)
+    roadm1 = deepcopy(path[1])
+    # the other request has a larger slot width (spacing) but no offset. so equalization uses this slot width
+    path_other = compute_constrained_path(network, other)
+    _ = propagate(path, other, equipment)
+    roadm1_other = path_other[1]
+    # check the first frequency since all cariers have the same equalization
+    # Check that the power is equalized as if it was for a 75GHz channel (mode 1) instead of a 87.5GHz
+    assert roadm1.pch_out_dbm[0] == roadm1_expected.pch_out_dbm[0]
+    # Check that equalization instead uses 87.5GHz basis
+    assert roadm1_other.pch_out_dbm[0] == roadm1_expected.pch_out_dbm[0] + lin2db(87.5 / 75)
+
+
+@pytest.mark.parametrize('slot_width, value', [(75e9, lin2db(75 / 50)),
+                                               (87.5e9, lin2db(75 / 50))])
+def test_power_offset_trx_equalization_p(slot_width, value):
+    """Check that the constant power equalization with the offset is applied
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    trx = transceiver(slot_width, value)
+    equipment['Transceiver'][trx['type_variety']] = Transceiver(**trx)
+    setattr(equipment['Roadm']['default'], 'target_pch_out_db', -20)
+    network = net_setup(equipment)
+    json_data = some_requests()
+    ref_request, request, _ = requests_from_json(json_data, equipment)
+    path_expected = compute_constrained_path(network, ref_request)
+    _ = propagate(path_expected, ref_request, equipment)
+    roadm1_expected = deepcopy(path_expected[1])
+    path = compute_constrained_path(network, request)
+    _ = propagate(path, request, equipment)
+    roadm1 = deepcopy(path[1])
+    assert roadm1.pch_out_dbm[0] == roadm1_expected.pch_out_dbm[0] + lin2db(75 / 50)
+
+
+@pytest.mark.parametrize('equalization, target_value',
+    [('target_pch_out_db', -20),
+     ('target_psd_out_mWperGHz', power_dbm_to_psd_mw_ghz(-20, 64e9)),
+     ('target_out_mWperSlotWidth', power_dbm_to_psd_mw_ghz(-20, 50e9))])
+@pytest.mark.parametrize('slot_width, value, expected_mode', [(75e9, 3.0, 'mode 3')])
+def test_power_offset_automatic_mode_selection(slot_width, value, equalization,
+                                               target_value, expected_mode):
+    """Check that the same result is obtained if the mode is user defined or if it is
+    automatically selected
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    trx = transceiver(slot_width, value)
+    equipment['Transceiver'][trx['type_variety']] = Transceiver(**trx)
+    setattr(equipment['Roadm']['default'], 'target_pch_out_db', None)
+    setattr(equipment['Roadm']['default'], equalization, target_value)
+    network = net_setup(equipment)
+    route = {
+        "route-object-include-exclude": [
+            {
+                "explicit-route-usage": "route-include-ero",
+                "index": 0,
+                "num-unnum-hop": {
+                    "node-id": "trx Brest_KLA",
+                    "link-tp-id": "link-tp-id is not used",
+                    "hop-type": "STRICT"
+                }
+            },
+            {
+                "explicit-route-usage": "route-include-ero",
+                "index": 1,
+                "num-unnum-hop": {
+                    "node-id": "trx Vannes_KBE",
+                    "link-tp-id": "link-tp-id is not used",
+                    "hop-type": "STRICT"
+                }
+            }
+        ]
+    }
+    json_data = {
+        "path-request": [{
+            "request-id": "imposed_mode",
+            "source": "trx Brest_KLA",
+            "destination": "trx Vannes_KBE",
+            "src-tp-id": "trx Brest_KLA",
+            "dst-tp-id": "trx Vannes_KBE",
+            "bidirectional": False,
+            "path-constraints": {
+                "te-bandwidth": {
+                    "technology": "flexi-grid",
+                    "trx_type": "test_offset",
+                    "trx_mode": "mode 3",
+                    "spacing": 75000000000.0,
+                    "path_bandwidth": 100000000000.0
+                }
+            },
+            "explicit-route-objects": route
+        }, {
+            "request-id": "free_mode",
+            "source": "trx Brest_KLA",
+            "destination": "trx Vannes_KBE",
+            "src-tp-id": "trx Brest_KLA",
+            "dst-tp-id": "trx Vannes_KBE",
+            "bidirectional": False,
+            "path-constraints": {
+                "te-bandwidth": {
+                    "technology": "flexi-grid",
+                    "trx_type": "test_offset",
+                    "spacing": 75000000000.0,
+                    "path_bandwidth": 100000000000.0
+                }
+            },
+            "explicit-route-objects": route
+        }]}
+    imposed_req, free_req, = requests_from_json(json_data, equipment)
+    assert free_req.tsp_mode is None
+    path_expected = compute_constrained_path(network, imposed_req)
+    _ = propagate(path_expected, imposed_req, equipment)
+    path = compute_constrained_path(network, free_req)
+    _, mode = propagate_and_optimize_mode(path, free_req, equipment)
+    assert mode['format'] == expected_mode
+    assert_allclose(path_expected[-1].snr_01nm, path[-1].snr_01nm, rtol=1e-5)
--- a/tests/test_info.py
+++ b/tests/test_info.py
@@ -4,47 +4,56 @@
 import pytest
 from numpy import array, zeros, ones
 from numpy.testing import assert_array_equal
-
-from gnpy.core.info import create_arbitrary_spectral_information
+from gnpy.core.info import create_arbitrary_spectral_information, Pref
 from gnpy.core.exceptions import SpectrumError


 def test_create_arbitrary_spectral_information():
    si = create_arbitrary_spectral_information(frequency=[193.25e12, 193.3e12, 193.35e12],
-                                               baud_rate=32e9, signal=[1, 1, 1])
+                                               baud_rate=32e9, signal=[1, 1, 1],
+                                               delta_pdb_per_channel=[1, 1, 1],
+                                               tx_osnr=40.0,
+                                               ref_power=Pref(1, 1, None))
    assert_array_equal(si.baud_rate, array([32e9, 32e9, 32e9]))
    assert_array_equal(si.slot_width, array([37.5e9, 37.5e9, 37.5e9]))
    assert_array_equal(si.signal, ones(3))
    assert_array_equal(si.nli, zeros(3))
    assert_array_equal(si.ase, zeros(3))
+    assert_array_equal(si.delta_pdb_per_channel, ones(3))
    assert_array_equal(si.roll_off, zeros(3))
    assert_array_equal(si.chromatic_dispersion, zeros(3))
    assert_array_equal(si.pmd, zeros(3))
    assert_array_equal(si.channel_number, array([1, 2, 3]))
    assert_array_equal(si.number_of_channels, 3)
    assert_array_equal(si.df, array([[0, 50e9, 100e9], [-50e9, 0, 50e9], [-100e9, -50e9, 0]]))
+    assert_array_equal(si.tx_osnr, array([40.0, 40.0, 40.0]))

    with pytest.raises(SpectrumError, match='Spectra cannot be summed: channels overlapping.'):
        si += si

    si = create_arbitrary_spectral_information(frequency=array([193.35e12, 193.3e12, 193.25e12]),
                                               slot_width=array([50e9, 50e9, 50e9]),
-                                               baud_rate=32e9, signal=array([1, 2, 3]))
+                                               baud_rate=32e9, signal=array([1, 2, 3]),
+                                               tx_osnr=40.0,
+                                               ref_power=Pref(1, 1, None))
+
    assert_array_equal(si.signal, array([3, 2, 1]))

    with pytest.raises(SpectrumError, match='Spectrum baud rate, including the roll off, '
                                            r'larger than the slot width for channels: \[1, 3\].'):
        create_arbitrary_spectral_information(frequency=[193.25e12, 193.3e12, 193.35e12], signal=1,
-                                              baud_rate=[64e9, 32e9, 64e9], slot_width=50e9)
+                                              baud_rate=[64e9, 32e9, 64e9], slot_width=50e9,
+                                              tx_osnr=40.0,
+                                              ref_power=Pref(1, 1, None))
    with pytest.raises(SpectrumError, match='Spectrum required slot widths larger than the frequency spectral '
                                            r'distances between channels: \[\(1, 2\), \(3, 4\)\].'):
        create_arbitrary_spectral_information(frequency=[193.26e12, 193.3e12, 193.35e12, 193.39e12], signal=1,
-                                              baud_rate=32e9, slot_width=50e9)
+                                              tx_osnr=40.0, baud_rate=32e9, slot_width=50e9, ref_power=Pref(1, 1, None))
    with pytest.raises(SpectrumError, match='Spectrum required slot widths larger than the frequency spectral '
                                            r'distances between channels: \[\(1, 2\), \(2, 3\)\].'):
        create_arbitrary_spectral_information(frequency=[193.25e12, 193.3e12, 193.35e12], signal=1, baud_rate=49e9,
-                                              roll_off=0.1)
-
+                                              tx_osnr=40.0, roll_off=0.1, ref_power=Pref(1, 1, None))
    with pytest.raises(SpectrumError,
                       match='Dimension mismatch in input fields.'):
-        create_arbitrary_spectral_information(frequency=[193.25e12, 193.3e12, 193.35e12], signal=[1, 2], baud_rate=49e9)
+        create_arbitrary_spectral_information(frequency=[193.25e12, 193.3e12, 193.35e12], signal=[1, 2], baud_rate=49e9,
+                                              tx_osnr=40.0, ref_power=Pref(1, 1, None))
--- a/tests/test_invocation.py
+++ b/tests/test_invocation.py
@@ -2,6 +2,7 @@

 from pathlib import Path
 import os
+from logging import INFO, Formatter
 import pytest
 import subprocess
 from gnpy.tools.cli_examples import transmission_main_example, path_requests_run
@@ -9,31 +10,46 @@ from gnpy.tools.cli_examples import transmission_main_example, path_requests_run
 SRC_ROOT = Path(__file__).parent.parent


-@pytest.mark.parametrize("output, handler, args", (
-    ('transmission_main_example', transmission_main_example, []),
-    ('transmission_saturated', transmission_main_example,
+@pytest.mark.parametrize("output, log, handler, args", (
+    ('transmission_main_example', None, transmission_main_example, []),
+    ('transmission_saturated', 'logs_transmission_saturated', transmission_main_example,
     ['tests/data/testTopology_expected.json', 'lannion', 'lorient', '-e', 'tests/data/eqpt_config.json', '--pow', '3']),
-    ('path_requests_run', path_requests_run, []),
-    ('transmission_main_example__raman', transmission_main_example,
+    ('path_requests_run', 'logs_path_request', path_requests_run, ['-v']),
+    ('transmission_main_example__raman', None, transmission_main_example,
     ['gnpy/example-data/raman_edfa_example_network.json', '--sim', 'gnpy/example-data/sim_params.json', '--show-channels', ]),
-    ('openroadm-v4-Stockholm-Gothenburg', transmission_main_example,
+    ('openroadm-v4-Stockholm-Gothenburg', None, transmission_main_example,
     ['-e', 'gnpy/example-data/eqpt_config_openroadm_ver4.json', 'gnpy/example-data/Sweden_OpenROADMv4_example_network.json', ]),
-    ('openroadm-v5-Stockholm-Gothenburg', transmission_main_example,
+    ('openroadm-v5-Stockholm-Gothenburg', None, transmission_main_example,
     ['-e', 'gnpy/example-data/eqpt_config_openroadm_ver5.json', 'gnpy/example-data/Sweden_OpenROADMv5_example_network.json', ]),
+    ('transmission_main_example_long', None, transmission_main_example,
+     ['-e', 'tests/data/eqpt_config.json', 'tests/data/test_long_network.json']),
+    ('spectrum1_transmission_main_example', None, transmission_main_example,
+     ['--spectrum', 'gnpy/example-data/initial_spectrum1.json', 'gnpy/example-data/meshTopologyExampleV2.xls', ]),
+    ('spectrum2_transmission_main_example', None, transmission_main_example,
+     ['--spectrum', 'gnpy/example-data/initial_spectrum2.json', 'gnpy/example-data/meshTopologyExampleV2.xls', '--show-channels', ]),
+    ('path_requests_run_CD_PMD_PDL_missing', 'logs_path_requests_run_CD_PMD_PDL_missing', path_requests_run,
+     ['tests/data/CORONET_Global_Topology_expected.json', 'tests/data/CORONET_services.json', '-v']),
 ))
-def test_example_invocation(capfd, output, handler, args):
-    '''Make sure that our examples produce useful output'''
+def test_example_invocation(capfd, caplog, output, log, handler, args):
+    """Make sure that our examples produce useful output"""
    os.chdir(SRC_ROOT)
    expected = open(SRC_ROOT / 'tests' / 'invocation' / output, mode='r', encoding='utf-8').read()
+    formatter = Formatter('%(levelname)-9s%(name)s:%(filename)s %(message)s')
+    caplog.handler.setFormatter(formatter)
+    # keep INFO level to at least test those logs once
+    caplog.set_level(INFO)
    handler(args)
    captured = capfd.readouterr()
    assert captured.out == expected
    assert captured.err == ''
+    if log:
+        expected_log = open(SRC_ROOT / 'tests' / 'invocation' / log, mode='r', encoding='utf-8').read()
+        assert expected_log == caplog.text


@pytest.mark.parametrize('program', ('gnpy-transmission-example', 'gnpy-path-request'))
 def test_run_wrapper(program):
-    '''Ensure that our wrappers really, really work'''
+    """Ensure that our wrappers really, really work"""
    proc = subprocess.run((program, '--help'), stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                          check=True, universal_newlines=True)
    assert proc.stderr == ''
@@ -45,5 +61,5 @@ def test_conversion_xls():
    proc = subprocess.run(
        ('gnpy-convert-xls', SRC_ROOT / 'tests' / 'data' / 'testTopology.xls', '--output', os.path.devnull),
        stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=True, universal_newlines=True)
-    assert proc.stderr == ''
+    assert proc.stderr == 'missing header delta p\nmissing header delta p\n'
    assert os.path.devnull in proc.stdout
--- a/tests/test_logger.py
+++ b/tests/test_logger.py
@@ -0,0 +1,422 @@
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Copyright (C) 2020 Telecom Infra Project and GNPy contributors
+# see LICENSE.md for a list of contributors
+#
+
+from pathlib import Path
+import re
+import pytest
+
+from gnpy.core.exceptions import ConfigurationError, ServiceError, EquipmentConfigError, ParametersError, \
+    NetworkTopologyError
+from gnpy.tools.json_io import SI, Roadm, Amp, load_equipment, requests_from_json, network_from_json, \
+    load_network, load_requests
+from gnpy.tools.convert import xls_to_json_data
+
+TEST_DIR = Path(__file__).parent
+EQPT_FILENAME = TEST_DIR / 'data/eqpt_config.json'
+DATA_DIR = TEST_DIR / 'data'
+
+
+def test_jsonthing(caplog):
+    """Check that a missing key correctly raises an info
+    """
+    json_data = {
+
+        "baud_rate": 32e9,
+        "f_max": 196.1e12,
+        "spacing": 50e9,
+        "power_dbm": 0,
+        "power_range_db": [0, 0, 1],
+        "roll_off": 0.15,
+        "tx_osnr": 40,
+        "sys_margins": 2
+    }
+    _ = SI(**json_data)
+    expected_msg = 'WARNING missing f_min attribute in eqpt_config.json[SI]\n ' \
+                   + 'default value is f_min = 191350000000000.0'
+    assert expected_msg in caplog.text
+
+
+def wrong_equipment():
+    """Creates list of malformed equipments
+    """
+    data = []
+    data.append({
+        "error": EquipmentConfigError,
+        "equipment": Roadm,
+        "json_data": {
+            "target_pch_out_db": -20,
+            "target_out_mWperSlotWidth": 3.125e-4,
+            "add_drop_osnr": 38,
+            "pmd": 0,
+            "pdl": 0,
+            "restrictions": {
+                "preamp_variety_list": [],
+                "booster_variety_list": []
+            }
+        },
+        "expected_msg": "Only one equalization type should be set in ROADM, found: target_pch_out_db,"
+                        + " target_out_mWperSlotWidth"
+    })
+    data.append({
+        "error": EquipmentConfigError,
+        "equipment": Roadm,
+        "json_data": {
+            "add_drop_osnr": 38,
+            "pmd": 0,
+            "pdl": 0,
+            "restrictions": {
+                "preamp_variety_list": [],
+                "booster_variety_list": []
+            }
+        },
+        "expected_msg": "No equalization type set in ROADM"
+    })
+    return data
+
+
+@pytest.mark.parametrize('error, equipment, json_data, expected_msg',
+                         [(e['error'], e['equipment'], e['json_data'], e['expected_msg']) for e in wrong_equipment()])
+def test_wrong_equipment(caplog, error, equipment, json_data, expected_msg):
+    """
+    """
+    with pytest.raises(EquipmentConfigError, match=expected_msg):
+        _ = equipment(**json_data)
+
+
+@pytest.mark.parametrize('xls_service_filename, xls_topo_filename, expected_msg',
+                         [('wrong_service.xlsx', 'testTopology.xls',
+                           "Service error: Request Id: 0 - could not find tsp : 'Voyager' with mode: 'Mode 10' "
+                           + "in eqpt library \nComputation stopped."),
+                          ('wrong_service_type.xlsx', 'testTopology.xls',
+                           "Service error: Request Id: 0 - could not find tsp : 'Galileo' with mode: 'mode 1' "
+                           + "in eqpt library \nComputation stopped.")])
+def test_wrong_xls_service(xls_service_filename, xls_topo_filename, expected_msg):
+    """
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    network = load_network(DATA_DIR / xls_topo_filename, equipment)
+    with pytest.raises(ServiceError, match=expected_msg):
+        _ = load_requests(DATA_DIR / xls_service_filename, equipment, False, network, DATA_DIR / xls_topo_filename)
+
+
+def wrong_amp():
+    """Creates list of malformed equipments
+    """
+    data = []
+    data.append({
+        "error": EquipmentConfigError,
+        "json_data": {
+            "type_variety": "test_fixed_gain",
+            "type_def": "fixed_gain",
+            "gain_flatmax": 21,
+            "gain_min": 20,
+            "p_max": 21,
+            "allowed_for_design": True
+        },
+        "expected_msg": "missing nf0 value input for amplifier: test_fixed_gain in equipment config"
+    })
+    data.append({
+        "error": EquipmentConfigError,
+        "json_data": {
+            "type_variety": "test",
+            "type_def": "variable_gain",
+            "gain_flatmax": 25,
+            "gain_min": 15,
+            "p_max": 21,
+            "nf_min": 5.8,
+            "out_voa_auto": False,
+            "allowed_for_design": True
+        },
+        "expected_msg": "missing nf_min or nf_max value input for amplifier: test in equipment config"
+    })
+    data.append({
+        "error": EquipmentConfigError,
+        "json_data": {
+            "type_variety": "medium+high_power",
+            "type_def": "dual_stage",
+            "gain_min": 25,
+            "preamp_variety": "std_medium_gain",
+            "allowed_for_design": False
+        },
+        "expected_msg": "missing preamp/booster variety input for amplifier: medium+high_power in equipment config"
+    })
+    return data
+
+
+@pytest.mark.parametrize('error, json_data, expected_msg',
+                         [(e['error'], e['json_data'], e['expected_msg']) for e in wrong_amp()])
+def test_wrong_amp(error, json_data, expected_msg):
+    """
+    """
+    with pytest.raises(error, match=re.escape(expected_msg)):
+        _ = Amp.from_json(EQPT_FILENAME, **json_data)
+
+
+def wrong_requests():
+    """Creates list of malformed requests
+    """
+    data = []
+    data.append({
+        'error': ConfigurationError,
+        'json_data': {
+            "path-request": [{
+                "request-id": "imposed_mode",
+                "source": "trx Brest_KLA",
+                "destination": "trx Vannes_KBE",
+                "src-tp-id": "trx Brest_KLA",
+                "dst-tp-id": "trx Vannes_KBE",
+                "bidirectional": False,
+                "path-constraints": {
+                    "te-bandwidth": {
+                        "technology": "flexi-grid",
+                        "trx_type": "test_offset",
+                        "trx_mode": "mode 3",
+                        "spacing": 75000000000.0,
+                        "path_bandwidth": 100000000000.0
+                    }
+                }
+            }]
+        },
+        'expected_msg': 'Equipment Config error in imposed_mode: '
+                        + 'Could not find transponder "test_offset" with mode "mode 3" in equipment library'
+    })
+    data.append({
+        'error': ServiceError,
+        'json_data': {
+            "path-request": [{
+                "request-id": "Missing_type",
+                "source": "trx Brest_KLA",
+                "destination": "trx Vannes_KBE",
+                "src-tp-id": "trx Brest_KLA",
+                "dst-tp-id": "trx Vannes_KBE",
+                "bidirectional": False,
+                "path-constraints": {
+                    "te-bandwidth": {
+                        "technology": "flexi-grid",
+                        "trx_type": None,
+                        "spacing": 75000000000.0,
+                        "path_bandwidth": 100000000000.0
+                    }
+                }
+            }]},
+        'expected_msg': 'Request Missing_type has no transceiver type defined'
+    })
+    data.append({
+        'error': ServiceError,
+        'json_data': {
+            "path-request": [{
+                "request-id": "wrong_spacing",
+                "source": "trx Brest_KLA",
+                "destination": "trx Vannes_KBE",
+                "src-tp-id": "trx Brest_KLA",
+                "dst-tp-id": "trx Vannes_KBE",
+                "bidirectional": False,
+                "path-constraints": {
+                    "te-bandwidth": {
+                        "technology": "flexi-grid",
+                        "trx_type": "Voyager",
+                        "trx_mode": "mode 2",
+                        "spacing": 50000000000.0,
+                        "path_bandwidth": 100000000000.0
+                    }
+                }
+            }]},
+        'expected_msg': 'Request wrong_spacing has spacing below transponder Voyager mode 2 min spacing'
+        + ' value 75.0GHz.\nComputation stopped'
+    })
+    data.append({
+        'error': ServiceError,
+        'json_data': {
+            "path-request": [{
+                "request-id": "Wrong_nb_channel",
+                "source": "trx Brest_KLA",
+                "destination": "trx Vannes_KBE",
+                "src-tp-id": "trx Brest_KLA",
+                "dst-tp-id": "trx Vannes_KBE",
+                "bidirectional": False,
+                "path-constraints": {
+                    "te-bandwidth": {
+                        "technology": "flexi-grid",
+                        "trx_type": "Voyager",
+                        "trx_mode": "mode 2",
+                        "spacing": 75000000000.0,
+                        "max-nb-of-channel": 150,
+                        "path_bandwidth": 100000000000.0
+                    }
+                }
+            }]},
+        'expected_msg': 'Requested channel number 150, baud rate 66.0 GHz'
+                        + ' and requested spacing 75.0GHz is not consistent with frequency range'
+                        + ' 191.35 THz, 196.1 THz.'
+                        + ' Max recommanded nb of channels is 63.'
+    })
+    data.append({
+        'error': ServiceError,
+        'json_data': {
+            "path-request": [{
+                "request-id": "Wrong_M",
+                "source": "trx Brest_KLA",
+                "destination": "trx Vannes_KBE",
+                "src-tp-id": "trx Brest_KLA",
+                "dst-tp-id": "trx Vannes_KBE",
+                "bidirectional": False,
+                "path-constraints": {
+                    "te-bandwidth": {
+                        "technology": "flexi-grid",
+                        "trx_type": "Voyager",
+                        "trx_mode": "mode 2",
+                        "spacing": 75000000000.0,
+                        "effective-freq-slot": [
+                            {
+                              "N": -208,
+                              "M": 4
+                            }
+                        ],
+                        "path_bandwidth": 100000000000.0
+                    }
+                }
+            }]},
+        'expected_msg': 'Requested M [{\'N\': -208, \'M\': 4}] number of slots for request Wrong_M '
+                        + 'support 0 nb of channels while 1 are required to support request 100.0 Gbit/s'
+                        + ' with Voyager mode 2'
+    })
+    return data
+
+
+@pytest.mark.parametrize('error, json_data, expected_msg',
+                         [(e['error'], e['json_data'], e['expected_msg']) for e in wrong_requests()])
+def test_json_request(error, json_data, expected_msg):
+    """
+    Check that a missing key is correctly raisong the logger
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+
+    with pytest.raises(error, match=re.escape(expected_msg)):
+        _ = requests_from_json(json_data, equipment)
+
+
+def wrong_element():
+    """
+    """
+    data = []
+    data.append({
+        "error": ConfigurationError,
+        "json_data": {
+            "elements": [{
+                "uid": "roadm SITE2",
+                "type": "Roadm",
+                "params": {
+                    "target_pch_out_db": -20,
+                    "target_out_mWperSlotWidth": 3.125e-4,
+                },
+                "metadata": {
+                    "location": {
+                        "latitude": 2.0,
+                        "longitude": 3.0,
+                        "city": "SITE2",
+                        "region": "RLD"
+                    }
+                }
+            }],
+            "connections": []
+        },
+        "expected_msg": "ROADM roadm SITE2: invalid equalization settings"
+    })
+    data.append({
+        "error": ConfigurationError,
+        "json_data": {
+            "elements": [{
+                "uid": "east edfa in ILA2 to SITE2",
+                "type": "Edfa",
+                "type_variety": "not_valid_variety",
+                "metadata": {
+                    "location": {
+                        "latitude": 2.0,
+                        "longitude": 0.0,
+                        "city": "ILA2",
+                        "region": "RLD"
+                    }
+                }
+            }],
+            "connections": []
+        },
+        "expected_msg": "The Edfa of variety type not_valid_variety was not recognized:"
+                        + "\nplease check it is properly defined in the eqpt_config json file"
+    })
+    data.append({
+        "error": ParametersError,
+        "json_data": {
+            "elements": [{
+                "uid": "fiber (ILA2 → ILA1)",
+                "type": "Fiber",
+                "type_variety": "SSMF",
+                "params": {
+                    "length": 100.0,
+                    "loss_coef": 0.2,
+                    "att_in": 0,
+                    "con_in": 0,
+                    "con_out": 0
+                },
+                "metadata": {
+                    "location": {
+                        "latitude": 2.0,
+                        "longitude": 1.5,
+                        "city": None,
+                        "region": None
+                    }
+                }
+            }],
+            "connections": []
+        },
+        "expected_msg": "Config error in fiber (ILA2 → ILA1): "
+                        + "Fiber configurations json must include \'length_units\'. Configuration: "
+                        + "{\'length\': 100.0, \'loss_coef\': 0.2, \'att_in\': 0, \'con_in\': 0, \'con_out\': 0, "
+                        + "\'type_variety\': \'SSMF\', \'dispersion\': 1.67e-05, \'effective_area\': 8.3e-11, "
+                        + "\'pmd_coef\': 1.265e-15}"
+    })
+    return data
+
+
+@pytest.mark.parametrize('error, json_data, expected_msg',
+                         [(e['error'], e['json_data'], e['expected_msg']) for e in wrong_element()])
+def test_json_network(error, json_data, expected_msg):
+    """
+    Check that a missing key is correctly raisong the logger
+    """
+    equipment = load_equipment(EQPT_FILENAME)
+    with pytest.raises(error, match=re.escape(expected_msg)):
+        _ = network_from_json(json_data, equipment)
+
+
+@pytest.mark.parametrize('input_filename, expected_msg',
+    [(DATA_DIR / 'wrong_topo_node.xlsx', 'XLS error: The following nodes are not referenced from the Links sheet.'
+                                         + ' If unused, remove them from the Nodes sheet:\n - toto'),
+     (DATA_DIR / 'wrong_topo_link.xlsx', 'XLS error: The Links sheet references nodes that are not defined in the '
+                                         + 'Nodes sheet:\n - ALB -> toto'),
+     (DATA_DIR / 'wrong_topo_link_header.xlsx', 'missing header Node Z'),
+     (DATA_DIR / 'wrong_topo_eqpt.xlsx', 'XLS error: The Eqpt sheet refers to nodes that are not defined in the '
+                                         + 'Nodes sheet:\n - toto'),
+     (DATA_DIR / 'wrong_topo_duplicate_node.xlsx', 'Duplicate city: Counter({\'ALB\': 2, \'CHA_3\': 1})'),
+     (DATA_DIR / 'wrong_topo_duplicate_eqpt.xlsx', 'XLS error: Duplicate lines in Eqpt sheet: - ALB -> CHA_3'),
+     (DATA_DIR / 'wrong_topo_bad_eqpt.xlsx', 'XLS error: The Eqpt sheet references links that are not defined '
+                                             + 'in the Links sheet:\n - toto -> CHA_3'),
+     (DATA_DIR / 'wrong_duplicate_link_reverse.xlsx', 'XLS error: links  - (\'ila\', \'siteb\') are duplicate'),
+     (DATA_DIR / 'wrong_duplicate_eqpt_ila_reverse.xlsx', 'XLS error: Duplicate ILA eqpt definition in Eqpt sheet:'
+                                                          + ' - ila')])
+def test_wrong_xlsx(input_filename, expected_msg):
+    """Check that error and logs are correctly working
+    """
+    with pytest.raises(NetworkTopologyError, match=re.escape(expected_msg)):
+        _ = xls_to_json_data(input_filename)
+
+
+@pytest.mark.parametrize('input_filename, expected_msg',
+    [(DATA_DIR / 'wrong_node_type.xlsx', 'invalid node type (ILA) specified in Lannion_CAS, replaced by ROADM\n')])
+def test_log_wrong_xlsx(caplog, input_filename, expected_msg):
+    """Check that logs are correctly working
+    """
+    _ = xls_to_json_data(input_filename)
+    assert expected_msg in caplog.text
--- a/tests/test_parameters.py
+++ b/tests/test_parameters.py
@@ -6,18 +6,51 @@ Checks that the class SimParams behaves as a mutable Singleton.
 """

 import pytest
-from gnpy.core.parameters import SimParams
+from pathlib import Path
+from numpy.testing import assert_allclose
+
+from gnpy.core.parameters import SimParams, FiberParams
+from gnpy.tools.json_io import load_json, Fiber
+
+TEST_DIR = Path(__file__).parent


@pytest.mark.usefixtures('set_sim_params')
 def test_sim_parameters():
    sim_params = {'nli_params': {}, 'raman_params': {}}
    SimParams.set_params(sim_params)
-    s1 = SimParams.get()
+    s1 = SimParams()
    assert s1.nli_params.method == 'gn_model_analytic'
-    s2 = SimParams.get()
+    s2 = SimParams()
    assert not s1.raman_params.flag
    sim_params['raman_params']['flag'] = True
    SimParams.set_params(sim_params)
    assert s2.raman_params.flag
    assert s1.raman_params.flag
+
+
+def test_fiber_parameters():
+    fiber_dict_explicit_g0 = load_json(TEST_DIR/'data'/'test_parameters_fiber_config.json')['params']
+    fiber_params_explicit_g0 = FiberParams(**fiber_dict_explicit_g0)
+
+    fiber_dict_default_g0 = load_json(TEST_DIR/'data'/'test_science_utils_fiber_config.json')['params']
+    fiber_params_default_g0 = FiberParams(**fiber_dict_default_g0)
+
+    fiber_dict_cr = load_json(TEST_DIR/'data'/'test_old_parameters_fiber_config.json')['params']
+    fiber_dict_cr.update(Fiber(**fiber_dict_cr).__dict__)
+    fiber_params_cr = FiberParams(**fiber_dict_cr)
+
+    raman_coefficient_explicit_g0 = fiber_params_explicit_g0.raman_coefficient
+    raman_coefficient_explicit_g0 =\
+        raman_coefficient_explicit_g0.normalized_gamma_raman * fiber_params_explicit_g0._raman_reference_frequency
+
+    raman_coefficient_default_g0 = fiber_params_default_g0.raman_coefficient
+    raman_coefficient_default_g0 = \
+        raman_coefficient_default_g0.normalized_gamma_raman * fiber_params_default_g0._raman_reference_frequency
+
+    raman_coefficient_cr = fiber_params_cr.raman_coefficient
+    raman_coefficient_cr = \
+        raman_coefficient_cr.normalized_gamma_raman * fiber_params_cr._raman_reference_frequency
+
+    assert_allclose(raman_coefficient_explicit_g0, raman_coefficient_default_g0, rtol=1e-10)
+    assert_allclose(raman_coefficient_explicit_g0, raman_coefficient_cr, rtol=1e-10)
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -3,16 +3,17 @@
 # @Author: Esther Le Rouzic
 # @Date:   2018-06-15

-""" Adding tests to check the parser non regression
-    convention of naming of test files:
-    - ..._expected.json for the reference output
-    tests:
-    - generation of topology json
-    - reading of Eqpt sheet w and W/ power mode
-    - consistency of autodesign
-    - generation of service list based on service sheet
-    - writing of results in csv
-    - writing of results in json (same keys)
+"""Adding tests to check the parser non regression
+
+convention of naming of test files:
+- ..._expected.json for the reference output
+tests:
+- generation of topology json
+- reading of Eqpt sheet w and W/ power mode
+- consistency of autodesign
+- generation of service list based on service sheet
+- writing of results in csv
+- writing of results in json (same keys)
 """

 from pathlib import Path
@@ -46,8 +47,7 @@ equipment = load_equipment(eqpt_filename)

 }.items())
 def test_excel_json_generation(tmpdir, xls_input, expected_json_output):
-    """ tests generation of topology json
-    """
+    """tests generation of topology json"""
    xls_copy = Path(tmpdir) / xls_input.name
    shutil.copyfile(xls_input, xls_copy)
    convert_file(xls_copy)
@@ -68,9 +68,7 @@ def test_excel_json_generation(tmpdir, xls_input, expected_json_output):
                          DATA_DIR / 'testTopology_auto_design_expected.json',
                          }.items())
 def test_auto_design_generation_fromxlsgainmode(tmpdir, xls_input, expected_json_output):
-    """ tests generation of topology json
-        test that the build network gives correct results in gain mode
-    """
+    """tests generation of topology json and that the build network gives correct results in gain mode"""
    equipment = load_equipment(eqpt_filename)
    network = load_network(xls_input, equipment)
    # in order to test the Eqpt sheet and load gain target,
@@ -100,8 +98,7 @@ def test_auto_design_generation_fromxlsgainmode(tmpdir, xls_input, expected_json
                          True
                          }.items())
 def test_auto_design_generation_fromjson(tmpdir, json_input, power_mode):
-    """test that autodesign creates same file as an input file already autodesigned
-    """
+    """test that autodesign creates same file as an input file already autodesigned"""
    equipment = load_equipment(eqpt_filename)
    network = load_network(json_input, equipment)
    # in order to test the Eqpt sheet and load gain target,
@@ -127,8 +124,7 @@ def test_auto_design_generation_fromjson(tmpdir, json_input, power_mode):
    DATA_DIR / 'testService.xls': DATA_DIR / 'testService_services_expected.json'
 }.items())
 def test_excel_service_json_generation(xls_input, expected_json_output):
-    """ test services creation
-    """
+    """test services creation"""
    equipment = load_equipment(eqpt_filename)
    network = load_network(DATA_DIR / 'testTopology.xls', equipment)
    # Build the network once using the default power defined in SI in eqpt config
@@ -148,9 +144,7 @@ def test_excel_service_json_generation(xls_input, expected_json_output):
    (DATA_DIR / 'testTopology_response.json', )
 )
 def test_csv_response_generation(tmpdir, json_input):
-    """ tests if generated csv is consistant with expected generation
-        same columns (order not important)
-    """
+    """tests if generated csv is consistant with expected generation same columns (order not important)"""
    json_data = load_json(json_input)
    equipment = load_equipment(eqpt_filename)
    csv_filename = Path(tmpdir / json_input.name).with_suffix('.csv')
@@ -215,8 +209,7 @@ def test_csv_response_generation(tmpdir, json_input):
    DATA_DIR / 'testTopology.xls': DATA_DIR / 'testTopology_response.json',
 }.items())
 def test_json_response_generation(xls_input, expected_response_file):
-    """ tests if json response is correctly generated for all combinations of requests
-    """
+    """tests if json response is correctly generated for all combinations of requests"""

    equipment = load_equipment(eqpt_filename)
    network = load_network(xls_input, equipment)
@@ -323,8 +316,7 @@ def test_json_response_generation(xls_input, expected_response_file):
    ('trx Brest_KLA', 'trx Rennes_STA', 'Brest_KLA | trx Lannion_CAS', 'STRICT', 'Fail')
 ])
 def test_excel_ila_constraints(source, destination, route_list, hoptype, expected_correction):
-    """ add different kind of constraints to test all correct_route cases
-    """
+    """add different kind of constraints to test all correct_route cases"""
    service_xls_input = DATA_DIR / 'testTopology.xls'
    network_json_input = DATA_DIR / 'testTopology_auto_design_expected.json'
    equipment = load_equipment(eqpt_filename)
@@ -363,7 +355,8 @@ def test_excel_ila_constraints(source, destination, route_list, hoptype, expecte
        'nb_channel': 0,
        'power': 0,
        'path_bandwidth': 0,
-        'effective_freq_slot': None
+        'effective_freq_slot': None,
+        'equalization_offset_db': 0
    }
    request = PathRequest(**params)

@@ -376,8 +369,7 @@ def test_excel_ila_constraints(source, destination, route_list, hoptype, expecte


 def setup_per_degree(case):
-    """ common setup for degree: returns the dict network for different cases
-    """
+    """common setup for degree: returns the dict network for different cases"""
    json_network = load_json(DATA_DIR / 'testTopology_expected.json')
    json_network_auto = load_json(DATA_DIR / 'testTopology_auto_design_expected.json')
    if case == 'no':
@@ -401,8 +393,7 @@ def setup_per_degree(case):

@pytest.mark.parametrize('case', ['no', 'all', 'Lannion_CAS and all', 'Lannion_CAS and one'])
 def test_target_pch_out_db_global(case):
-    """ check that per degree attributes are correctly created with global values if none are given
-    """
+    """check that per degree attributes are correctly created with global values if none are given"""
    json_network = setup_per_degree(case)
    per_degree = {}
    for elem in json_network['elements']:
@@ -442,14 +433,12 @@ def test_target_pch_out_db_global(case):


 def all_rows(sh, start=0):
-    """ reads excel sheet row per row
-    """
+    """reads excel sheet row per row"""
    return (sh.row(x) for x in range(start, sh.nrows))


 class Amp:
-    """ Node element contains uid, list of connected nodes and eqpt type
-    """
+    """Node element contains uid, list of connected nodes and eqpt type"""

    def __init__(self, uid, to_node, eqpt=None, west=None):
        self.uid = uid
@@ -459,7 +448,7 @@ class Amp:


 def test_eqpt_creation(tmpdir):
-    """ tests that convert correctly creates equipment according to equipment sheet
+    """tests that convert correctly creates equipment according to equipment sheet
    including all cominations in testTopologyconvert.xls: if a line exists the amplifier
    should be created even if no values are provided.
    """
@@ -506,3 +495,71 @@ def test_eqpt_creation(tmpdir):
    # check that all amp in the converted files corresponds to an eqpt line
    for ampuid in jsonconverted.keys():
        assert ampuid in possiblename
+
+
+def test_service_json_constraint_order():
+    """test that the constraints are read in correct order"""
+
+    unsorted_request = {
+        "request-id": "unsorted",
+        "source": "trx Brest_KLA",
+        "destination": "trx Vannes_KBE",
+        "src-tp-id": "trx Brest_KLA",
+        "dst-tp-id": "trx Vannes_KBE",
+        "bidirectional": False,
+        "path-constraints": {
+            "te-bandwidth": {
+                "technology": "flexi-grid",
+                "trx_type": "Voyager",
+                "trx_mode": "mode 1",
+                "spacing": 50000000000.0,
+                "output-power": 0.001,
+                "path_bandwidth": 10000000000.0
+            }
+        },
+        "explicit-route-objects": {
+            "route-object-include-exclude": [
+                {
+                    "explicit-route-usage": "route-include-ero",
+                    "index": 2,
+                    "num-unnum-hop": {
+                        "node-id": "roadm Lorient_KMA",
+                        "link-tp-id": "link-tp-id is not used",
+                        "hop-type": "STRICT"
+                    }
+                },
+                {
+                    "explicit-route-usage": "route-include-ero",
+                    "index": 3,
+                    "num-unnum-hop": {
+                        "node-id": "roadm Vannes_KBE",
+                        "link-tp-id": "link-tp-id is not used",
+                        "hop-type": "STRICT"
+                    }
+                },
+                {
+                    "explicit-route-usage": "route-include-ero",
+                    "index": 1,
+                    "num-unnum-hop": {
+                        "node-id": "roadm Lannion_CAS",
+                        "link-tp-id": "link-tp-id is not used",
+                        "hop-type": "LOOSE"
+                    }
+                },
+                {
+                    "explicit-route-usage": "route-include-ero",
+                    "index": 0,
+                    "num-unnum-hop": {
+                        "node-id": "roadm Brest_KLA",
+                        "link-tp-id": "link-tp-id is not used",
+                        "hop-type": "STRICT"
+                    }
+                }
+            ]
+        }
+    }
+
+    data = {'path-request': [unsorted_request]}
+    rqs = requests_from_json(data, equipment)
+    assert rqs[0].nodes_list == ['roadm Brest_KLA', 'roadm Lannion_CAS', 'roadm Lorient_KMA', 'roadm Vannes_KBE']
+    assert rqs[0].loose_list == ['STRICT', 'LOOSE', 'STRICT', 'STRICT']
--- a/tests/test_propagation.py
+++ b/tests/test_propagation.py
@@ -6,7 +6,7 @@
 import pytest
 from gnpy.core.elements import Transceiver, Fiber, Edfa, Roadm
 from gnpy.core.utils import db2lin
-from gnpy.core.info import create_input_spectral_information
+from gnpy.core.info import create_input_spectral_information, ReferenceCarrier
 from gnpy.core.network import build_network
 from gnpy.tools.json_io import load_network, load_equipment
 from pathlib import Path
@@ -45,7 +45,9 @@ def propagation(input_power, con_in, con_out, dest):
    p = input_power
    p = db2lin(p) * 1e-3
    spacing = 50e9  # THz
-    si = create_input_spectral_information(191.3e12, 191.3e12 + 79 * spacing, 0.15, 32e9, p, spacing)
+    si = create_input_spectral_information(f_min=191.3e12, f_max=191.3e12 + 79 * spacing, roll_off=0.15,
+                                           baud_rate=32e9, power=p, spacing=spacing, tx_osnr=None,
+                                           ref_carrier=ReferenceCarrier(baud_rate=32e9, slot_width=50e9))
    source = next(transceivers[uid] for uid in transceivers if uid == 'trx A')
    sink = next(transceivers[uid] for uid in transceivers if uid == dest)
    path = dijkstra_path(network, source, sink)
--- a/tests/test_roadm_restrictions.py
+++ b/tests/test_roadm_restrictions.py
@@ -19,7 +19,7 @@ from gnpy.core.elements import Fused, Roadm, Edfa
 from gnpy.core.network import build_network
 from gnpy.tools.json_io import network_from_json, load_equipment, load_json, Amp
 from gnpy.core.equipment import trx_mode_params
-from gnpy.topology.request import PathRequest, compute_constrained_path
+from gnpy.topology.request import PathRequest, compute_constrained_path, ref_carrier
 from gnpy.core.info import create_input_spectral_information
 from gnpy.core.utils import db2lin

@@ -31,10 +31,10 @@ NETWORK_FILE_NAME = TEST_DIR / 'data/testTopology_expected.json'
 # mark node_uid amps as fused for testing purpose
@pytest.mark.parametrize("node_uid", ['east edfa in Lannion_CAS to Stbrieuc'])
 def test_no_amp_feature(node_uid):
-    ''' Check that booster is not placed on a roadm if fused is specified
-        test_parser covers partly this behaviour. This test should guaranty that the
-        feature is preserved even if convert is changed
-    '''
+    """Check that booster is not placed on a roadm if fused is specified
+    test_parser covers partly this behaviour. This test should guaranty that the
+    feature is preserved even if convert is changed
+    """
    equipment = load_equipment(EQPT_LIBRARY_NAME)
    json_network = load_json(NETWORK_FILE_NAME)

@@ -145,9 +145,9 @@ def equipment():
        'booster_variety_list':[]
    }])
 def test_restrictions(restrictions, equipment):
-    ''' test that restriction is correctly applied if provided in eqpt_config and if no Edfa type
+    """test that restriction is correctly applied if provided in eqpt_config and if no Edfa type
    were provided in the network json
-    '''
+    """
    # add restrictions
    equipment['Roadm']['default'].restrictions = restrictions
    # build network
@@ -212,11 +212,11 @@ def test_restrictions(restrictions, equipment):
@pytest.mark.parametrize('power_dbm', [0, +1, -2])
@pytest.mark.parametrize('prev_node_type, effective_pch_out_db', [('edfa', -20.0), ('fused', -22.0)])
 def test_roadm_target_power(prev_node_type, effective_pch_out_db, power_dbm):
-    ''' Check that egress power of roadm is equal to target power if input power is greater
+    """Check that egress power of roadm is equal to target power if input power is greater
    than target power else, that it is equal to input power. Use a simple two hops A-B-C topology
    for the test where the prev_node in ROADM B is either an amplifier or a fused, so that the target
    power can not be met in this last case.
-    '''
+    """
    equipment = load_equipment(EQPT_LIBRARY_NAME)
    json_network = load_json(TEST_DIR / 'data/twohops_roadm_power_test.json')
    prev_node = next(n for n in json_network['elements'] if n['uid'] == 'west edfa in node B to ila2')
@@ -228,9 +228,9 @@ def test_roadm_target_power(prev_node_type, effective_pch_out_db, power_dbm):
        prev_node['params'] = {'loss': 0}
    json_network['elements'].append(prev_node)
    network = network_from_json(json_network, equipment)
-    p_total_db = power_dbm + lin2db(automatic_nch(equipment['SI']['default'].f_min,
-                                                  equipment['SI']['default'].f_max,
-                                                  equipment['SI']['default'].spacing))
+    nb_channel = automatic_nch(equipment['SI']['default'].f_min, equipment['SI']['default'].f_max,
+                               equipment['SI']['default'].spacing)
+    p_total_db = power_dbm + lin2db(nb_channel)

    build_network(network, equipment, power_dbm, p_total_db)

@@ -245,6 +245,7 @@ def test_roadm_target_power(prev_node_type, effective_pch_out_db, power_dbm):
              'format': '',
              'path_bandwidth': 100e9,
              'effective_freq_slot': None,
+              'nb_channel': nb_channel
              }
    trx_params = trx_mode_params(equipment)
    params.update(trx_params)
@@ -252,15 +253,14 @@ def test_roadm_target_power(prev_node_type, effective_pch_out_db, power_dbm):
    req.power = db2lin(power_dbm - 30)
    path = compute_constrained_path(network, req)
    si = create_input_spectral_information(
-        req.f_min, req.f_max, req.roll_off, req.baud_rate,
-        req.power, req.spacing)
+        f_min=req.f_min, f_max=req.f_max, roll_off=req.roll_off, baud_rate=req.baud_rate,
+        power=req.power, spacing=req.spacing, tx_osnr=req.tx_osnr, ref_carrier=ref_carrier(equipment))
    for i, el in enumerate(path):
        if isinstance(el, Roadm):
-            min_power_in_roadm = min(si.signal + si.ase + si.nli)
+            power_in_roadm = si.signal + si.ase + si.nli
            si = el(si, degree=path[i + 1].uid)
            power_out_roadm = si.signal + si.ase + si.nli
            if el.uid == 'roadm node B':
-                print('input', min_power_in_roadm)
                # if previous was an EDFA, power level at ROADM input is enough for the ROADM to apply its
                # target power (as specified in equipment ie -20 dBm)
                # if it is a Fused, the input power to the ROADM is smaller than the target power, and the
@@ -279,7 +279,7 @@ def test_roadm_target_power(prev_node_type, effective_pch_out_db, power_dbm):
                    # to roadm is low.
                    # check that target power correctly reports power_dbm from previous propagation
                    assert_allclose(el.ref_pch_out_dbm, effective_pch_out_db + power_dbm, rtol=1e-3)
-                    # Check that egress power of roadm is equalized to the min carrier input power.
-                    assert_allclose(power_out_roadm, min_power_in_roadm, rtol=1e-3)
+                    # Check that egress power of roadm is not equalized power out is the same as power in.
+                    assert_allclose(power_out_roadm, power_in_roadm, rtol=1e-3)
        else:
            si = el(si)
--- a/tests/test_science_utils.py
+++ b/tests/test_science_utils.py
@@ -9,10 +9,11 @@ are tested.
 from pathlib import Path
 from pandas import read_csv
 from numpy.testing import assert_allclose
-from numpy import array, genfromtxt
+from numpy import array
 import pytest

-from gnpy.core.info import create_input_spectral_information, create_arbitrary_spectral_information
+from gnpy.core.info import create_input_spectral_information, create_arbitrary_spectral_information, Pref, \
+    ReferenceCarrier
 from gnpy.core.elements import Fiber, RamanFiber
 from gnpy.core.parameters import SimParams
 from gnpy.tools.json_io import load_json
@@ -23,12 +24,14 @@ TEST_DIR = Path(__file__).parent


 def test_fiber():
-    """ Test the accuracy of propagating the Fiber."""
+    """Test the accuracy of propagating the Fiber."""
    fiber = Fiber(**load_json(TEST_DIR / 'data' / 'test_science_utils_fiber_config.json'))

    # fix grid spectral information generation
    spectral_info_input = create_input_spectral_information(f_min=191.3e12, f_max=196.1e12, roll_off=0.15,
-                                                            baud_rate=32e9, power=1e-3, spacing=50e9)
+                                                            baud_rate=32e9, power=1e-3, spacing=50e9, tx_osnr=40.0,
+                                                            ref_carrier=
+                                                            ReferenceCarrier(baud_rate=32e9, slot_width=50e9))
    # propagation
    spectral_info_out = fiber(spectral_info_input)

@@ -44,8 +47,12 @@ def test_fiber():
    slot_width = array([37.5e9, 50e9, 75e9, 50e9, 37.5e9])
    baud_rate = array([32e9, 42e9, 64e9, 42e9, 32e9])
    signal = 1e-3 + array([0, -1e-4, 3e-4, -2e-4, +2e-4])
+    delta_pdb_per_channel = [0, 0, 0, 0, 0]
+    pref = Pref(p_span0=0, p_spani=0, ref_carrier=None)
    spectral_info_input = create_arbitrary_spectral_information(frequency=frequency, slot_width=slot_width,
-                                                                signal=signal, baud_rate=baud_rate, roll_off=0.15)
+                                                                signal=signal, baud_rate=baud_rate, roll_off=0.15,
+                                                                delta_pdb_per_channel=delta_pdb_per_channel,
+                                                                tx_osnr=40.0, ref_power=pref)

    # propagation
    spectral_info_out = fiber(spectral_info_input)
@@ -60,10 +67,11 @@ def test_fiber():

@pytest.mark.usefixtures('set_sim_params')
 def test_raman_fiber():
-    """ Test the accuracy of propagating the RamanFiber."""
+    """Test the accuracy of propagating the RamanFiber."""
    # spectral information generation
    spectral_info_input = create_input_spectral_information(f_min=191.3e12, f_max=196.1e12, roll_off=0.15,
-                                                            baud_rate=32e9, power=1e-3, spacing=50e9)
+                                                            baud_rate=32e9, power=1e-3, spacing=50e9, tx_osnr=40.0,
+                                                            ref_carrier=ReferenceCarrier(baud_rate=32e9, slot_width=50e9))
    SimParams.set_params(load_json(TEST_DIR / 'data' / 'sim_params.json'))
    fiber = RamanFiber(**load_json(TEST_DIR / 'data' / 'test_science_utils_fiber_config.json'))

@@ -86,7 +94,7 @@ def test_raman_fiber():
     (0.5, 81, "Lumped loss positions must be between 0 and the fiber length (80.0 km), boundaries excluded.")))
@pytest.mark.usefixtures('set_sim_params')
 def test_fiber_lumped_losses(loss, position, errmsg, set_sim_params):
-    """ Lumped losses length sanity checking."""
+    """Lumped losses length sanity checking."""
    SimParams.set_params(load_json(TEST_DIR / 'data' / 'sim_params.json'))
    fiber_dict = load_json(TEST_DIR / 'data' / 'test_lumped_losses_raman_fiber_config.json')
    fiber_dict['params']['lumped_losses'] = [{'position': position, 'loss': loss}]
@@ -97,10 +105,12 @@ def test_fiber_lumped_losses(loss, position, errmsg, set_sim_params):

@pytest.mark.usefixtures('set_sim_params')
 def test_fiber_lumped_losses_srs(set_sim_params):
-    """ Test the accuracy of Fiber with lumped losses propagation."""
+    """Test the accuracy of Fiber with lumped losses propagation."""
    # spectral information generation
    spectral_info_input = create_input_spectral_information(f_min=191.3e12, f_max=196.1e12, roll_off=0.15,
-                                                            baud_rate=32e9, power=1e-3, spacing=50e9)
+                                                            baud_rate=32e9, power=1e-3, spacing=50e9, tx_osnr=40.0,
+                                                            ref_carrier=
+                                                            ReferenceCarrier(baud_rate=32e9, slot_width=50e9))

    SimParams.set_params(load_json(TEST_DIR / 'data' / 'sim_params.json'))
    fiber = Fiber(**load_json(TEST_DIR / 'data' / 'test_lumped_losses_raman_fiber_config.json'))
@@ -111,18 +121,18 @@ def test_fiber_lumped_losses_srs(set_sim_params):
    stimulated_raman_scattering = RamanSolver.calculate_stimulated_raman_scattering(
        spectral_info_input, fiber)
    power_profile = stimulated_raman_scattering.power_profile
-    expected_power_profile = genfromtxt(TEST_DIR / 'data' / 'test_lumped_losses_fiber_no_pumps.csv', delimiter=',')
+    expected_power_profile = read_csv(TEST_DIR / 'data' / 'test_lumped_losses_fiber_no_pumps.csv', header=None)
    assert_allclose(power_profile, expected_power_profile, rtol=1e-3)

    # with Raman pumps
-    expected_power_profile = genfromtxt(TEST_DIR / 'data' / 'test_lumped_losses_raman_fiber.csv', delimiter=',')
+    expected_power_profile = read_csv(TEST_DIR / 'data' / 'test_lumped_losses_raman_fiber.csv', header=None)
    stimulated_raman_scattering = RamanSolver.calculate_stimulated_raman_scattering(
        spectral_info_input, raman_fiber)
    power_profile = stimulated_raman_scattering.power_profile
    assert_allclose(power_profile, expected_power_profile, rtol=1e-3)

    # without Stimulated Raman Scattering
-    expected_power_profile = genfromtxt(TEST_DIR / 'data' / 'test_lumped_losses_fiber_no_raman.csv', delimiter=',')
+    expected_power_profile = read_csv(TEST_DIR / 'data' / 'test_lumped_losses_fiber_no_raman.csv', header=None)
    stimulated_raman_scattering = RamanSolver.calculate_attenuation_profile(spectral_info_input, fiber)
    power_profile = stimulated_raman_scattering.power_profile
    assert_allclose(power_profile, expected_power_profile, rtol=1e-3)
--- a/tests/test_spectrum_assignment.py
+++ b/tests/test_spectrum_assignment.py
@@ -20,7 +20,8 @@ from gnpy.core.elements import Roadm, Transceiver
 from gnpy.core.exceptions import ServiceError, SpectrumError
 from gnpy.topology.request import compute_path_dsjctn, find_reversed_path, deduplicate_disjunctions, PathRequest
 from gnpy.topology.spectrum_assignment import (build_oms_list, align_grids, nvalue_to_frequency,
-                                           bitmap_sum, Bitmap, spectrum_selection, pth_assign_spectrum)
+                                               bitmap_sum, Bitmap, spectrum_selection, pth_assign_spectrum,
+                                               build_path_oms_id_list, aggregate_oms_bitmap)
 from gnpy.tools.json_io import (load_equipment, load_network, requests_from_json, disjunctions_from_json,
                                _check_one_request)

@@ -45,8 +46,7 @@ def equipment():

@pytest.fixture()
 def setup(equipment):
-    """ common setup for tests: builds network, equipment and oms only once
-    """
+    """common setup for tests: builds network, equipment and oms only once"""
    network = load_network(NETWORK_FILENAME, equipment)
    spectrum = equipment['SI']['default']
    p_db = spectrum.power_dbm
@@ -57,9 +57,9 @@ def setup(equipment):


 def test_oms(setup):
-    """ tests that the OMS is between two ROADMs, that there is no ROADM or transceivers in the OMS
-        except end points, checks that the id of OMS is present in the element and that the element
-        OMS id is consistant
+    """tests that the OMS is between two ROADMs, that there is no ROADM or transceivers in the OMS
+    except end points, checks that the id of OMS is present in the element and that the element
+    OMS id is consistant
    """
    network, oms_list = setup
    for oms in oms_list:
@@ -150,8 +150,7 @@ def test_aligned(nmin, nmax, setup):
@pytest.mark.parametrize('nval1', [0, 15, 24])
@pytest.mark.parametrize('nval2', [8, 12])
 def test_assign_and_sum(nval1, nval2, setup):
-    """ checks that bitmap sum gives correct result
-    """
+    """checks that bitmap sum gives correct result"""
    network, oms_list = setup
    guardband = grid
    mval = 4  # slot in 12.5GHz
@@ -198,8 +197,7 @@ def test_assign_and_sum(nval1, nval2, setup):


 def test_bitmap_assignment(setup):
-    """ test that a bitmap can be assigned
-    """
+    """test that a bitmap can be assigned"""
    network, oms_list = setup
    random_oms = oms_list[2]
    random_oms.assign_spectrum(13, 7)
@@ -216,8 +214,7 @@ def test_bitmap_assignment(setup):

@pytest.fixture()
 def services(equipment):
-    """ common setup for service list: builds service only once
-    """
+    """common setup for service list: builds service only once"""
    with open(SERVICE_FILENAME, encoding='utf-8') as my_f:
        services = json.loads(my_f.read())
    return services
@@ -225,25 +222,24 @@ def services(equipment):

@pytest.fixture()
 def requests(equipment, services):
-    """ common setup for requests, builds requests list only once
-    """
+    """common setup for requests, builds requests list only once"""
    requests = requests_from_json(services, equipment)
    return requests


 def test_spectrum_assignment_on_path(equipment, setup, requests):
-    """ test assignment functions on path and network
-    """
+    """test assignment functions on path and network"""
    network, oms_list = setup
    req = [deepcopy(requests[1])]
    paths = compute_path_dsjctn(network, equipment, req, [])
-
+    first_path_oms = build_path_oms_id_list(paths[0])
    print(req)
    for nval in range(100):
        req = [deepcopy(requests[1])]
-        (center_n, startn, stopn), path_oms = spectrum_selection(paths[0], oms_list, 4)
+        test_oms = aggregate_oms_bitmap(first_path_oms, oms_list)
+        center_n, startn, stopn = spectrum_selection(test_oms, 4)
        pth_assign_spectrum(paths, req, oms_list, [find_reversed_path(paths[0])])
-        print(f'testing on following oms {path_oms}')
+        print(f'testing on following oms {first_path_oms}')
        # check that only 96 channels are feasible
        if nval >= 96:
            print(center_n, startn, stopn)
@@ -256,13 +252,15 @@ def test_spectrum_assignment_on_path(equipment, setup, requests):

    req = [requests[2]]
    paths = compute_path_dsjctn(network, equipment, req, [])
-    (center_n, startn, stopn), path_oms = spectrum_selection(paths[0], oms_list, 4, 478)
+    second_path_oms = build_path_oms_id_list(paths[0])
+    test_oms = aggregate_oms_bitmap(second_path_oms, oms_list)
+    center_n, startn, stopn = spectrum_selection(test_oms, 4, 478)
    print(oms_list[0].spectrum_bitmap.freq_index_max)
    print(oms_list[0])
    print(center_n, startn, stopn)
    print('spectrum selection error: should be None')
    assert center_n is None and startn is None and stopn is None
-    (center_n, startn, stopn), path_oms = spectrum_selection(paths[0], oms_list, 4, 477)
+    center_n, startn, stopn = spectrum_selection(test_oms, 4, 477)
    print(center_n, startn, stopn)
    print('spectrum selection error should not be None')
    assert center_n is not None and startn is not None and stopn is not None
@@ -270,8 +268,7 @@ def test_spectrum_assignment_on_path(equipment, setup, requests):

@pytest.fixture()
 def request_set():
-    """ creates default request dict
-    """
+    """creates default request dict"""
    return {
        'request_id': '0',
        'source': 'trx a',
@@ -295,29 +292,28 @@ def request_set():
        'min_spacing': 37.5e9,
        'nb_channel': None,
        'power': 0,
-        'path_bandwidth': 800e9}
+        'path_bandwidth': 800e9,
+        'equalization_offset_db': 0}


 def test_freq_slot_exist(setup, equipment, request_set):
-    """ test that assignment works even if effective_freq_slot is not populated
-    """
+    """test that assignment works even if effective_freq_slot is not populated"""
    network, oms_list = setup
    params = request_set
-    params['effective_freq_slot'] = None
+    params['effective_freq_slot'] = [{'N': None, 'M': None}]
    rqs = [PathRequest(**params)]
    paths = compute_path_dsjctn(network, equipment, rqs, [])
    pth_assign_spectrum(paths, rqs, oms_list, [find_reversed_path(paths[0])])
-    assert rqs[0].N == -256
-    assert rqs[0].M == 32
+    assert rqs[0].N == [-256]
+    assert rqs[0].M == [32]


 def test_inconsistant_freq_slot(setup, equipment, request_set):
-    """ test that an inconsistant M correctly raises an error
-    """
+    """test that an inconsistant M correctly raises an error"""
    network, oms_list = setup
    params = request_set
    # minimum required nb of slots is 32 (800Gbit/100Gbit/s channels each occupying 50GHz ie 4 slots)
-    params['effective_freq_slot'] = {'N': 0, 'M': 4}
+    params['effective_freq_slot'] = [{'N': 0, 'M': 4}]
    with pytest.raises(ServiceError):
        _check_one_request(params, 196.05e12)
    params['trx_mode'] = None
@@ -327,27 +323,59 @@ def test_inconsistant_freq_slot(setup, equipment, request_set):
    assert rqs[0].blocking_reason == 'NOT_ENOUGH_RESERVED_SPECTRUM'


-@pytest.mark.parametrize('n, m, final_n, final_m, blocking_reason', [
+@pytest.mark.parametrize('req_n, req_m, final_n, final_m, blocking_reason, raises_error', [
    # regular requests that should be correctly assigned:
-    (-100, 32, -100, 32, None),
-    (150, 50, 150, 50, None),
+    ([-100], [32], [-100], [32], None, False),
+    ([150], [50], [150], [50], None, False),
    # if n is None, there should be an assignment (enough spectrum cases)
    # and the center frequency should be set on the lower part of the spectrum based on m value if it exists
    # or based on 32
-    (None, 32, -256, 32, None),
-    (None, 40, -248, 40, None),
-    (-100, None, -100, 32, None),
-    (None, None, -256, 32, None),
+    ([None], [32], [-256], [32], None, False),
+    ([None], [40], [-248], [40], None, False),
+    ([-100], [None], [-100], [32], None, False),
+    ([None], [None], [-256], [32], None, False),
    # -280 and 60 center indexes should result in unfeasible spectrum, either out of band or
    # overlapping with occupied spectrum. The requested spectrum is not available
-    (-280, None, None, None, 'NO_SPECTRUM'),
-    (-60, 40, None, None, 'NO_SPECTRUM'),
+    ([None], [300], None, None, 'NO_SPECTRUM', False),
+    ([-280], [None], None, None, 'NO_SPECTRUM', False),
+    ([-60], [40], None, None, 'NO_SPECTRUM', False),
+    # raises service error: M value too small
+    ([-60], [3], None, None, 'NOT_ENOUGH_RESERVED_SPECTRUM', True),
    # 20 is smaller than min 32 required nb of slots so should also be blocked
-    (-60, 20, None, None, 'NOT_ENOUGH_RESERVED_SPECTRUM')
-    ])
-def test_n_m_requests(setup, equipment, n, m, final_n, final_m, blocking_reason, request_set):
-    """ test that various N and M values for a request end up with the correct path assgnment
-    """
+    ([-60], [20], None, None, 'NOT_ENOUGH_RESERVED_SPECTRUM', False),
+    # multiple assignments
+    ([-100, -164], [16, 16], [-100, -164], [16, 16], None, False),
+    ([-100, -164], [32, 32], [-100, -164], [32, 32], None, False),
+    ([-100, -164], [None, None], [-164], [32], None, False),
+    ([None, None], [16, 16], [-272, -240], [16, 16], None, False),
+    ([None, None, None], [16, 16, None], [-272, -240], [16, 16], None, False),
+    ([None, None], [None, None], [-256], [32], None, False),
+    ([-272, None], [16, 16], [-272, -240], [16, 16], None, False),
+    ([-272, 100], [None, 16], [-272, 100], [16, 16], None, False),
+    # first assign defined Ms whatever the N (but order them), and then uses imposed N. Fill in with the max
+    # available nb of slots (centered on N).
+    ([-88, -100, -116, None], [8, None, 12, None], [-88, -100, -116, -280], [8, 4, 12, 8], None, False),
+    # If no M is defined, uses th Ns to fill in with the max possible nb of slots (with respecte to request,
+    # here it is 32 slots)
+    ([-88, -106, -116, None], [None, None, None, None], [-116], [32], None, False),
+    # if one defined N, M is not applicable then blocks the spectrum (even f other slots are OK)
+    # only 2 slots remains between  -104 (-100 - 4) and -108 (-112 + 4). So (-106, None) is not feasible, because min
+    # required M is 4 for Voyager, Mode 1
+    ([-100, -106, -112], [4, None, 4], None, None, 'NO_SPECTRUM', False),
+    # required nb of channels is 8 with 4 slots each. Next two spectrum are not providing enough spectrum
+    # raises service error: not enough nb of channels
+    ([-88, -100, -116], [4, 4, 4], None, None, 'NOT_ENOUGH_RESERVED_SPECTRUM', True),
+    ([-88, -100, -116], [4, None, 4], None, None, 'NO_SPECTRUM', False),
+    # only 4 slots remains between -96 (-88 -8) and -104 (-116 + 12), and centered on -100, so N = -101 is not
+    # feasible whatever the M.
+    ([-88, -101, -116, None], [8, 4, 12, None], None, None, 'NO_SPECTRUM', False),
+    ([-88, -101, -116, -250], [4, 4, 12, 12], None, None, 'NO_SPECTRUM', False),
+    ([-88, -101, -116, None], [8, None, 12, None], None, None, 'NO_SPECTRUM', False),
+    # raises service error: slots overlap
+    ([-88, -81, -116, -136], [8, 8, 12, 8], None, None, 'NO_SPECTRUM', True),
+])
+def test_n_m_requests(setup, equipment, req_n, req_m, final_n, final_m, blocking_reason, raises_error, request_set):
+    """test that various N and M values for a request end up with the correct path assignment"""
    network, oms_list = setup
    # add an occupation on one of the span of the expected path OMS list on both directions
    # as defined by its offsets within the OMS list: [17, 20, 13, 22] and reversed path [19, 16, 21, 26]
@@ -356,7 +384,10 @@ def test_n_m_requests(setup, equipment, n, m, final_n, final_m, blocking_reason,
    some_oms = oms_list[expected_oms[3]]
    some_oms.assign_spectrum(-30, 32)    # means that spectrum is occupied from indexes -62 to 1 on reversed path
    params = request_set
-    params['effective_freq_slot'] = {'N': n, 'M': m}
+    params['effective_freq_slot'] = [{'N': n, 'M': m} for n, m in zip(req_n, req_m)]
+    if raises_error:
+        with pytest.raises(ServiceError):
+            _check_one_request(params, 196.3e12)
    rqs = [PathRequest(**params)]

    paths = compute_path_dsjctn(network, equipment, rqs, [])
@@ -372,9 +403,7 @@ def test_n_m_requests(setup, equipment, n, m, final_n, final_m, blocking_reason,


 def test_reversed_direction(equipment, setup, requests, services):
-    """ checks that if spectrum is selected on one direction it is also selected on reversed
-        direction
-    """
+    """checks that if spectrum is selected on one direction it is also selected on reversed direction"""
    network, oms_list = setup
    dsjn = disjunctions_from_json(services)
    dsjn = deduplicate_disjunctions(dsjn)
@@ -392,8 +421,9 @@ def test_reversed_direction(equipment, setup, requests, services):
        if pth:
            number_wl = ceil(requests[i].path_bandwidth / requests[i].bit_rate)
            requested_m = ceil(requests[i].spacing / slot) * number_wl
-            (center_n, startn, stopn), path_oms = spectrum_selection(pth, oms_list, requested_m,
-                                                                     requested_n=None)
+            path_oms = build_path_oms_id_list(pth)
+            test_oms = aggregate_oms_bitmap(path_oms, oms_list)
+            center_n, startn, stopn = spectrum_selection(test_oms, requested_m, requested_n=None)
            spectrum_list.append([center_n, startn, stopn])
        else:
            spectrum_list.append([])
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ commands =
 	pytest {env:CI_COVERAGE_OPTS:} -vv {posargs}
 	cover: coverage html -d cover
 	cover: coverage xml -o cover/coverage.xml
-	python setup.py bdist_wheel
+	python -m build

 [testenv:docs]
 deps =
@@ -43,4 +43,4 @@ commands =
 [flake8]
 max-line-length = 120
 max-complexity = 15
-ignore = N806
+ignore = N806 W503