diff --git a/Excel_userguide.rst b/Excel_userguide.rst
index b5ba6b46..edc53534 100644
--- a/Excel_userguide.rst
+++ b/Excel_userguide.rst
@@ -189,7 +189,7 @@ Service sheet must contain 11 columns::
 
    route id ; Source ; Destination ; TRX type ; Mode ; System: spacing ; System: input power (dBm) ; System: nb of channels ;  routing: disjoint from ; routing: path ; routing: is loose?
 
-- **route id** is mandatory. It must be unique. It is the identifier of the request. It must be an integer value (TODO: relax this format in future development to accept any strings)
+- **route id** is mandatory. It must be unique. It is the identifier of the request. It can be an integer or a string (do not  use blank or dash)
 
 - **Source** is mandatory. It is the name of the source node (as listed in Nodes sheet). Source MUST be a ROADM node. (TODO: relax this and accept trx entries)
 
diff --git a/examples/convert_service_sheet.py b/examples/convert_service_sheet.py
index 2b262df4..cd885480 100644
--- a/examples/convert_service_sheet.py
+++ b/examples/convert_service_sheet.py
@@ -53,7 +53,16 @@ class Element:
 
 class Request_element(Element):
     def __init__(self,Request,eqpt_filename):
-        self.request_id = int(Request.request_id)
+        # request_id is str
+        # excel has automatic number formatting that adds .0 on integer values 
+        # the next lines recover the pure int value, assuming this .0 is unwanted
+        if not isinstance(Request.request_id,str):
+            value = str(int(Request.request_id))
+            if value.endswith('.0'):
+                value = value[:-2]
+            self.request_id = value
+        else:
+            self.request_id = Request.request_id
         self.source = Request.source
         self.destination = Request.destination
         self.srctpid = f'trx {Request.source}'
@@ -61,21 +70,27 @@ class Request_element(Element):
         # test that trx_type belongs to eqpt_config.json
         # if not replace it with a default 
         equipment = load_equipment(eqpt_filename)
-        if equipment['Transceiver'][Request.trx_type]:
-            self.trx_type = Request.trx_type
-            self.mode = Request.mode
-        else:
-            #TODO : this case must raise an error instead of using Voyager
-            self.trx_type = 'Voyager_16QAM'
-            print(f'Transceiver type {Request.trx_type} is not defined in {eqpt_filename}')
-            print('replaced by Voyager_16QAM')
+        try :
+            if equipment['Transceiver'][Request.trx_type]:
+                self.trx_type = Request.trx_type
+            if [mode for mode in equipment['Transceiver'][Request.trx_type].mode]:
+                self.mode = Request.mode
+        except KeyError:
+            msg = f'could not find tsp : {Request.trx_type} with mode: {Request.mode} in eqpt library \nComputation stopped.'
+            #print(msg)
+            logger.critical(msg)
+            exit()
+        # excel input are in GHz and dBm
         self.spacing = Request.spacing * 1e9
         self.power =  db2lin(Request.power) * 1e-3
         self.nb_channel = int(Request.nb_channel)
-        if isinstance(Request.disjoint_from,str):
-            self.disjoint_from = [int(n) for n in Request.disjoint_from.split()]
+        if not isinstance(Request.disjoint_from,str):
+            value = str(int(Request.disjoint_from))
+            if value.endswith('.0'):
+                value = value[:-2]
         else:
-            self.disjoint_from = [int(Request.disjoint_from)]
+            value = Request.disjoint_from
+        self.disjoint_from = [n for n in value.split()]
         self.nodes_list = []
         if Request.nodes_list :
             self.nodes_list = Request.nodes_list.split(' | ')
@@ -83,7 +98,7 @@ class Request_element(Element):
             self.nodes_list.remove(self.source)
             msg = f'{self.source} removed from explicit path node-list'
             logger.info(msg)
-            print(msg)
+            # print(msg)
         except ValueError:
             msg = f'{self.source} already removed from explicit path node-list'
             logger.info(msg)
@@ -92,7 +107,7 @@ class Request_element(Element):
             self.nodes_list.remove(self.destination)
             msg = f'{self.destination} removed from explicit path node-list'
             logger.info(msg)
-            print(msg)
+            # print(msg)
         except ValueError:
             msg = f'{self.destination} already removed from explicit path node-list'
             logger.info(msg)
diff --git a/examples/eqpt_config.json b/examples/eqpt_config.json
index c20aa30c..0e73d6bc 100644
--- a/examples/eqpt_config.json
+++ b/examples/eqpt_config.json
@@ -21,7 +21,7 @@
             {
             "type_variety": "std_low_gain",
             "type_def": "variable_gain",
-            "gain_flatmax": 17,
+            "gain_flatmax": 16,
             "gain_min": 8,
             "p_max": 22,
             "nf_min": 6.5,
@@ -36,7 +36,7 @@
             "gain_min": 20,
             "p_max": 21,
             "nf0": 5.5,
-            "allowed_for_design": true
+            "allowed_for_design": false
             },
             {
             "type_variety": "test",
@@ -90,6 +90,20 @@
                         "max": 196.1e12
                         },
             "mode":[
+                       {
+                       "format": "mode 1",
+                       "baud_rate": 32e9,
+                       "OSNR": 11,
+                       "bit_rate": 100e9,
+                       "roll_off": 0.15
+                       },
+                       {
+                       "format": "mode 2",
+                       "baud_rate": 66e9,
+                       "OSNR": 15,
+                       "bit_rate": 200e9,
+                       "roll_off": 0.15
+                       },
                        {
                        "format": "PS_SP64_1",
                        "baud_rate": 32e9,
@@ -107,6 +121,30 @@
                    ]
             },
             {
+            "type_variety": "Voyager",
+            "frequency":{
+                        "min": 191.35e12,
+                        "max": 196.1e12
+                        },
+            "mode":[
+                       {
+                       "format": "16QAM",
+                       "baud_rate": 32e9,
+                       "OSNR": 19,
+                       "bit_rate": 200e9,
+                       "roll_off": 0.15
+                       },
+                       {
+                       "format": "QPSK",
+                       "baud_rate": 32e9,
+                       "OSNR": 12,
+                       "bit_rate": 100e9,
+                       "roll_off": 0.15
+                       }
+
+                   ]
+            },
+                        {
             "type_variety": "Voyager_16QAM",
             "frequency":{
                         "min": 191.35e12,
@@ -119,7 +157,15 @@
                        "OSNR": 19,
                        "bit_rate": 200e9,
                        "roll_off": 0.15
+                       },
+                       {
+                       "format": "QPSK",
+                       "baud_rate": 32e9,
+                       "OSNR": 12,
+                       "bit_rate": 100e9,
+                       "roll_off": 0.15
                        }
+
                    ]
             }
       ]
diff --git a/examples/meshTopologyToy.xls b/examples/meshTopologyToy.xls
new file mode 100644
index 00000000..05ae7d6a
Binary files /dev/null and b/examples/meshTopologyToy.xls differ
diff --git a/examples/path_requests_run.py b/examples/path_requests_run.py
index e40160a9..6f2a4478 100644
--- a/examples/path_requests_run.py
+++ b/examples/path_requests_run.py
@@ -30,7 +30,7 @@ from gnpy.core.network import load_network, build_network, set_roadm_loss
 from gnpy.core.equipment import load_equipment, trx_mode_params
 from gnpy.core.elements import Transceiver, Roadm, Edfa, Fused
 from gnpy.core.utils import db2lin, lin2db
-from gnpy.core.request import Path_request, Result_element, compute_constrained_path, propagate
+from gnpy.core.request import Path_request, Result_element, compute_constrained_path, propagate, jsontocsv
 from copy import copy, deepcopy
 
 #EQPT_LIBRARY_FILENAME = Path(__file__).parent / 'eqpt_config.json'
@@ -97,14 +97,15 @@ def compute_path(network, equipment, pathreqlist):
         #we assume that the destination is a strict constraint
         pathreq.loose_list.append('strict')
         print(f'Computing path from {pathreq.source} to {pathreq.destination}')
-        print(f'with explicit path: {[pathreq.source]+pathreq.nodes_list}') #adding first node to be clearer on the output
+        print(f'with path constraint: {[pathreq.source]+pathreq.nodes_list}') #adding first node to be clearer on the output
         total_path = compute_constrained_path(network, pathreq)
-        
+        print(f'Computed path (roadms):{[e.uid for e in total_path  if isinstance(e, Roadm)]}\n')
         # for debug
         # print(f'{pathreq.baud_rate}   {pathreq.power}   {pathreq.spacing}   {pathreq.nb_channel}')
-        
-        total_path = propagate(total_path,pathreq,equipment, show=False)
-
+        if total_path :
+            total_path = propagate(total_path,pathreq,equipment, show=False)
+        else:
+            total_path = []
         # we record the last tranceiver object in order to have th whole 
         # information about spectrum. Important Note: since transceivers 
         # attached to roadms are actually logical elements to simulate
@@ -136,16 +137,32 @@ if __name__ == '__main__':
     print(pths)
     test = compute_path(network, equipment, pths)
     
-    if args.output is None:
-        #TODO write results
-        print("demand\t\t\t\tsnr@bandwidth\tsnr@0.1nm")
-        
-        for i, p in enumerate(test):
-            print(f'{pths[i].source} to {pths[i].destination} : {round(mean(p[-1].snr),2)} ,\
-                {round(mean(p[-1].snr+lin2db(pths[i].baud_rate/(12.5e9))),2)}')
-    else:
+    #TODO write results
+
+    header = ['demand','snr@bandwidth','snr@0.1nm','Receiver minOSNR']
+    data = []
+    data.append(header)
+    for i, p in enumerate(test):
+        if p:
+            line = [f'{pths[i].source} to {pths[i].destination} : ', f'{round(mean(p[-1].snr),2)}',\
+                f'{round(mean(p[-1].snr+lin2db(pths[i].baud_rate/(12.5e9))),2)}',\
+                f'{pths[i].OSNR}']
+        else:
+            line = [f'no path from {pths[i].source} to {pths[i].destination} ']
+        data.append(line)
+
+    col_width = max(len(word) for row in data for word in row)   # padding
+    for row in data:
+        print(''.join(word.ljust(col_width) for word in row))
+
+
+
+    if args.output :
         result = []
         for p in test:
             result.append(Result_element(pths[test.index(p)],p))
         with open(args.output, 'w') as f:
-            f.write(dumps(path_result_json(result), indent=2))
\ No newline at end of file
+            f.write(dumps(path_result_json(result), indent=2))
+            fnamecsv = next(s for s in args.output.split('.')) + '.csv'
+            with open(fnamecsv,"w") as fcsv :
+                jsontocsv(path_result_json(result),equipment,fcsv)
\ No newline at end of file
diff --git a/examples/write_path_jsontocsv.py b/examples/write_path_jsontocsv.py
index 59973b91..ffd1e02a 100644
--- a/examples/write_path_jsontocsv.py
+++ b/examples/write_path_jsontocsv.py
@@ -14,80 +14,26 @@ and write results in an CSV file
 
 """
 
-from sys import exit
-from csv import writer
 from argparse import ArgumentParser
 from pathlib import Path
-from json import dumps, loads
+from json import loads
 from gnpy.core.equipment  import load_equipment
-from gnpy.core.utils import lin2db
-
-START_LINE = 5
+from gnpy.core.request  import jsontocsv
 
 
 parser = ArgumentParser(description = 'A function that writes json path results in an excel sheet.')
 parser.add_argument('filename', nargs='?', type = Path)
-parser.add_argument('eqpt_filename', nargs='?', type = Path)
-
 parser.add_argument('output_filename', nargs='?', type = Path)
+parser.add_argument('eqpt_filename', nargs='?', type = Path, default=Path(__file__).parent / 'eqpt_config.json')
 
 if __name__ == '__main__':
     args = parser.parse_args()
-    print(f'coucou {args.output_filename}')
+    
     with open(args.output_filename,"w") as file :
-        mywriter = writer(file)
-        mywriter.writerow(('path-id','source','destination','transponder-type',\
-            'transponder-mode','baud rate (Gbaud)', 'input power (dBm)','path','OSNR@bandwidth','OSNR@0.1nm','SNR@bandwidth','SNR@0.1nm','Pass?'))
-
         with open(args.filename) as f:
+            print(f'Reading {args.filename}')
             json_data = loads(f.read())
             equipment = load_equipment(args.eqpt_filename)
-            tspjsondata = equipment['Transceiver']
-            #print(tspjsondata)
-            for p in json_data['path']:
-                path_id     = int(p['path-id'])
-                source      = p['path-properties']['path-route-objects'][0]\
-                ['path-route-object']['unnumbered-hop']['node-id']
-                destination = p['path-properties']['path-route-objects'][-1]\
-                ['path-route-object']['unnumbered-hop']['node-id']
-                pth        = ' | '.join([ e['path-route-object']['unnumbered-hop']['node-id'] 
-                         for e in p['path-properties']['path-route-objects']])
+            print(f'Writing in {args.output_filename}')
+            jsontocsv(json_data,equipment,file)
 
-                [tsp,mode] = p['path-properties']['path-route-objects'][0]\
-                ['path-route-object']['unnumbered-hop']['hop-type'].split(' - ')
-                
-                # find the min  acceptable OSNR, baud rate from the eqpt library based on tsp (tupe) and mode (format)
-                try:
-                    [minosnr, baud_rate] = next([m['OSNR'] , m['baud_rate']]  
-                        for m in equipment['Transceiver'][tsp].mode if  m['format']==mode)
-    
-                # for debug
-                # print(f'coucou {baud_rate}')
-                except IndexError:
-                    msg = f'could not find tsp : {self.tsp} with mode: {self.tsp_mode} in eqpt library'
-                    
-                    raise ValueError(msg)
-                output_snr = next(e['accumulative-value'] 
-                    for e in p['path-properties']['path-metric'] if e['metric-type'] == 'SNR@0.1nm')
-                output_snrbandwidth = next(e['accumulative-value'] 
-                    for e in p['path-properties']['path-metric'] if e['metric-type'] == 'SNR@bandwidth')
-                output_osnr = next(e['accumulative-value'] 
-                    for e in p['path-properties']['path-metric'] if e['metric-type'] == 'OSNR@0.1nm')
-                output_osnrbandwidth = next(e['accumulative-value'] 
-                    for e in p['path-properties']['path-metric'] if e['metric-type'] == 'OSNR@bandwidth')
-                power = next(e['accumulative-value'] 
-                    for e in p['path-properties']['path-metric'] if e['metric-type'] == 'reference_power')
-                mywriter.writerow((path_id,
-                    source,
-                    destination,
-                    tsp,
-                    mode,
-                    baud_rate*1e-9,
-                    round(lin2db(power)+30,2),
-                    pth,
-                    output_osnrbandwidth,
-                    output_osnr,
-                    output_snrbandwidth,
-                    output_snr,
-                    output_snr >= minosnr
-                    ))
diff --git a/gnpy/core/network.py b/gnpy/core/network.py
index d408ba6b..5f4f6a20 100644
--- a/gnpy/core/network.py
+++ b/gnpy/core/network.py
@@ -137,7 +137,7 @@ def target_power(network, node, equipment): #get_fiber_dp
         exit()
     if isinstance(node, Roadm) or not power_mode:
         dp = 0
-    print(f'{repr(node)} delta power in:\n{dp}dB')
+    # print(f'{repr(node)} delta power in:\n{dp}dB')
     return dp
     
 
@@ -252,6 +252,7 @@ def set_egress_amplifier(network, roadm, equipment, pref_total_db):
             prev_dp = dp
             prev_node = node
             node = next_node
+            # print(f'{node.uid}')
             next_node = next(n for n in network.successors(node))
 
 
diff --git a/gnpy/core/request.py b/gnpy/core/request.py
index c389442d..a1bcc0d9 100644
--- a/gnpy/core/request.py
+++ b/gnpy/core/request.py
@@ -25,6 +25,10 @@ from gnpy.core.network import set_roadm_loss
 from gnpy.core.utils import db2lin, lin2db
 from gnpy.core.info import create_input_spectral_information, SpectralInformation, Channel, Power
 from copy import copy, deepcopy
+from csv import writer
+
+logger = getLogger(__name__)
+
 
 RequestParams = namedtuple('RequestParams','request_id source destination trx_type'+
 ' trx_mode nodes_list loose_list spacing power nb_channel frequency format baud_rate OSNR bit_rate roll_off')
@@ -55,17 +59,19 @@ class Path_request:
                             f'destination:  {self.destination}'])
     def __repr__(self):
         return '\n\t'.join([  f'{type(self).__name__} {self.request_id}',
-                            f'source:       {self.source}',
-                            f'destination:  {self.destination}',
-                            f'trx type:     {self.tsp}',
-                            f'baud_rate:     {self.baud_rate}',
-                            f'spacing:      {self.spacing}',
-                            f'power:        {self.power}'
+                            f'source: \t{self.source}',
+                            f'destination:\t{self.destination}',
+                            f'trx type:\t{self.tsp}',
+                            f'trx mode:\t{self.tsp_mode}',
+                            f'baud_rate:\t{self.baud_rate * 1e-9} Gbaud',
+                            f'bit_rate:\t{self.bit_rate * 1e-9} Gb/s',
+                            f'spacing:\t{self.spacing * 1e-9} GHz',
+                            f'power:  \t{round(lin2db(self.power)+30,2)} dBm'
                             '\n'])
 
 class Result_element(Element):
     def __init__(self,path_request,computed_path):
-        self.path_id = int(path_request.request_id)
+        self.path_id = path_request.request_id
         self.path_request = path_request
         self.computed_path = computed_path
         hop_type = []
@@ -78,56 +84,125 @@ class Result_element(Element):
     uid = property(lambda self: repr(self))
     @property
     def pathresult(self):
-        return {
-               'path-id': self.path_id,
-               'path-properties':{
-                   'path-metric': [
-                       {
-                       'metric-type': 'SNR@bandwidth',
-                       'accumulative-value': round(mean(self.computed_path[-1].snr),2)
-                       },
-                       {
-                       'metric-type': 'SNR@0.1nm',
-                       'accumulative-value': round(mean(self.computed_path[-1].snr+lin2db(self.path_request.baud_rate/12.5e9)),2)
-                       },
-                       {
-                       'metric-type': 'OSNR@bandwidth',
-                       'accumulative-value': round(mean(self.computed_path[-1].osnr_ase),2)
-                       },
-                       {
-                       'metric-type': 'OSNR@0.1nm',
-                       'accumulative-value': round(mean(self.computed_path[-1].osnr_ase_01nm),2)
-                       },
-                       {
-                       'metric-type': 'reference_power',
-                       'accumulative-value': self.path_request.power
-                       }
-                    ],
-                    'path-srlgs': {
-                        'usage': 'not used yet',
-                        'values': 'not used yet'
-                    },
-                    'path-route-objects': [
-                        {
-                        'path-route-object': {
-                            'index': self.computed_path.index(n),
-                            'unnumbered-hop': {
-                                'node-id': n.uid,
-                                'link-tp-id': n.uid,
-                                'hop-type': self.hop_type[self.computed_path.index(n)],
-                                'direction': 'not used'
+        if not self.computed_path:
+            return {
+                   'path-id': self.path_id,
+                   'path-properties':{
+                       'path-metric': [
+                           {
+                           'metric-type': 'SNR@bandwidth',
+                           'accumulative-value': 'None'
+                           },
+                           {
+                           'metric-type': 'SNR@0.1nm',
+                           'accumulative-value': 'None'
+                           },
+                           {
+                           'metric-type': 'OSNR@bandwidth',
+                           'accumulative-value': 'None'
+                           },
+                           {
+                           'metric-type': 'OSNR@0.1nm',
+                           'accumulative-value': 'None'
+                           },
+                           {
+                           'metric-type': 'reference_power',
+                           'accumulative-value': self.path_request.power
+                           }
+                        ],
+                        'path-srlgs': {
+                            'usage': 'not used yet',
+                            'values': 'not used yet'
+                        },
+                        'path-route-objects': [
+                            {
+                            'path-route-object': {
+                                'index': 0,
+                                'unnumbered-hop': {
+                                    'node-id': self.path_request.source,
+                                    'link-tp-id': self.path_request.source,
+                                    'hop-type': ' - '.join([self.path_request.tsp, self.path_request.tsp_mode]),
+                                    'direction': 'not used'
+                                },
+                                'label-hop': {
+                                    'te-label': {
+                                        'generic': 'not used yet',
+                                        'direction': 'not used yet'
+                                        }
+                                    }
+                                }
                             },
-                            'label-hop': {
-                                'te-label': {
-                                    'generic': 'not used yet',
-                                    'direction': 'not used yet'
+                            {
+                            'path-route-object': {
+                                'index': 1,
+                                'unnumbered-hop': {
+                                    'node-id': self.path_request.destination,
+                                    'link-tp-id': self.path_request.destination,
+                                    'hop-type': ' - '.join([self.path_request.tsp, self.path_request.tsp_mode]),
+                                    'direction': 'not used'
+                                },
+                                'label-hop': {
+                                    'te-label': {
+                                        'generic': 'not used yet',
+                                        'direction': 'not used yet'
+                                        }
                                     }
                                 }
                             }
-                        } for n in self.computed_path
-                        ]
+                            ]
+                    }
+                }
+        else:
+            return {
+                   'path-id': self.path_id,
+                   'path-properties':{
+                       'path-metric': [
+                           {
+                           'metric-type': 'SNR@bandwidth',
+                           'accumulative-value': round(mean(self.computed_path[-1].snr),2)
+                           },
+                           {
+                           'metric-type': 'SNR@0.1nm',
+                           'accumulative-value': round(mean(self.computed_path[-1].snr+lin2db(self.path_request.baud_rate/12.5e9)),2)
+                           },
+                           {
+                           'metric-type': 'OSNR@bandwidth',
+                           'accumulative-value': round(mean(self.computed_path[-1].osnr_ase),2)
+                           },
+                           {
+                           'metric-type': 'OSNR@0.1nm',
+                           'accumulative-value': round(mean(self.computed_path[-1].osnr_ase_01nm),2)
+                           },
+                           {
+                           'metric-type': 'reference_power',
+                           'accumulative-value': self.path_request.power
+                           }
+                        ],
+                        'path-srlgs': {
+                            'usage': 'not used yet',
+                            'values': 'not used yet'
+                        },
+                        'path-route-objects': [
+                            {
+                            'path-route-object': {
+                                'index': self.computed_path.index(n),
+                                'unnumbered-hop': {
+                                    'node-id': n.uid,
+                                    'link-tp-id': n.uid,
+                                    'hop-type': self.hop_type[self.computed_path.index(n)],
+                                    'direction': 'not used'
+                                },
+                                'label-hop': {
+                                    'te-label': {
+                                        'generic': 'not used yet',
+                                        'direction': 'not used yet'
+                                        }
+                                    }
+                                }
+                            } for n in self.computed_path
+                            ]
+                    }
                 }
-            }
                     
     @property
     def json(self):
@@ -139,6 +214,8 @@ def compute_constrained_path(network, req):
     edfa = [n for n in network.nodes() if isinstance(n, Edfa)]
     source = next(el for el in trx if el.uid == req.source)
     # start the path with its source
+    # TODO : avoid loops due to constraints , guess name base on string,
+    # avoid crashing if on req is not correct
     total_path = [source]
     for n in req.nodes_list:
         # print(n)
@@ -170,7 +247,16 @@ def compute_constrained_path(network, req):
             else:
                 msg = f'could not find a path from {source.uid} to node : {n} in network topology'
                 logger.critical(msg)
-                raise ValueError(msg)
+                #raise ValueError(msg)
+                print(msg)
+                total_path = []
+
+# preparing disjonction feature
+    # for p in all_simple_paths(network,\
+    #     source=next(el for el in trx if el.uid == req.source),\
+    #     target=next(el for el in trx if el.uid == req.destination)):
+    #     print([e.uid for e in p if isinstance(e,Roadm)])
+
     return total_path 
 
 def propagate(path, req, equipment, show=False):
@@ -183,4 +269,69 @@ def propagate(path, req, equipment, show=False):
         si = el(si)
         if show :
             print(el)
-    return path    
\ No newline at end of file
+    return path    
+
+
+def jsontocsv(json_data,equipment,fileout):
+    # read 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(('path-id','source','destination','transponder-type',\
+        'transponder-mode','baud rate (Gbaud)', 'input power (dBm)','path',\
+        'OSNR@bandwidth','OSNR@0.1nm','SNR@bandwidth','SNR@0.1nm','Pass?'))
+    tspjsondata = equipment['Transceiver']
+    #print(tspjsondata)
+    for p in json_data['path']:
+        path_id     = p['path-id']
+        source      = p['path-properties']['path-route-objects'][0]\
+        ['path-route-object']['unnumbered-hop']['node-id']
+        destination = p['path-properties']['path-route-objects'][-1]\
+        ['path-route-object']['unnumbered-hop']['node-id']
+        pth        = ' | '.join([ e['path-route-object']['unnumbered-hop']['node-id'] 
+                 for e in p['path-properties']['path-route-objects']])
+
+        [tsp,mode] = p['path-properties']['path-route-objects'][0]\
+        ['path-route-object']['unnumbered-hop']['hop-type'].split(' - ')
+        
+        # find the min  acceptable OSNR, baud rate from the eqpt library based on tsp (tupe) and mode (format)
+        try:
+            [minosnr, baud_rate] = next([m['OSNR'] , m['baud_rate']]  
+                for m in equipment['Transceiver'][tsp].mode if  m['format']==mode)
+
+        # for debug
+        # print(f'coucou {baud_rate}')
+        except IndexError:
+            msg = f'could not find tsp : {self.tsp} with mode: {self.tsp_mode} in eqpt library'
+            
+            raise ValueError(msg)
+        output_snr = next(e['accumulative-value'] 
+            for e in p['path-properties']['path-metric'] if e['metric-type'] == 'SNR@0.1nm')
+        output_snrbandwidth = next(e['accumulative-value'] 
+            for e in p['path-properties']['path-metric'] if e['metric-type'] == 'SNR@bandwidth')
+        output_osnr = next(e['accumulative-value'] 
+            for e in p['path-properties']['path-metric'] if e['metric-type'] == 'OSNR@0.1nm')
+        output_osnrbandwidth = next(e['accumulative-value'] 
+            for e in p['path-properties']['path-metric'] if e['metric-type'] == 'OSNR@bandwidth')
+        power = next(e['accumulative-value'] 
+            for e in p['path-properties']['path-metric'] if e['metric-type'] == 'reference_power')
+        if isinstance(output_snr, str):
+            isok = ''
+        else:
+            isok = output_snr >= minosnr
+        mywriter.writerow((path_id,
+            source,
+            destination,
+            tsp,
+            mode,
+            baud_rate*1e-9,
+            round(lin2db(power)+30,2),
+            pth,
+            output_osnrbandwidth,
+            output_osnr,
+            output_snrbandwidth,
+            output_snr,
+            isok 
+            ))
\ No newline at end of file
diff --git a/tests/data/excelTestFile_services_expected.json b/tests/data/excelTestFile_services_expected.json
index 11e42e58..14a23abd 100644
--- a/tests/data/excelTestFile_services_expected.json
+++ b/tests/data/excelTestFile_services_expected.json
@@ -1,7 +1,7 @@
 {
   "path-request": [
     {
-      "request-id": 0,
+      "request-id": "0",
       "source": "BREST_KLA",
       "destination": "Vannes_KBE",
       "src-tp-id": "trx BREST_KLA",
@@ -27,7 +27,7 @@
       }
     },
     {
-      "request-id": 1,
+      "request-id": "1",
       "source": "Lorient_KMA",
       "destination": "Vannes_KBE",
       "src-tp-id": "trx Lorient_KMA",
@@ -55,26 +55,26 @@
   ],
   "synchronisation": [
     {
-      "synchonization-id": 0,
+      "synchonization-id": "0",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          0,
-          1
+          "0",
+          "1"
         ]
       }
     },
     {
-      "synchonization-id": 1,
+      "synchonization-id": "1",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          1,
-          0
+          "1",
+          "0"
         ]
       }
     }
diff --git a/tests/data/meshTopologyExampleV2Eqpt_services_expected.json b/tests/data/meshTopologyExampleV2Eqpt_services_expected.json
index d02eadcb..19e405e8 100644
--- a/tests/data/meshTopologyExampleV2Eqpt_services_expected.json
+++ b/tests/data/meshTopologyExampleV2Eqpt_services_expected.json
@@ -1,7 +1,7 @@
 {
   "path-request": [
     {
-      "request-id": 0,
+      "request-id": "0",
       "source": "Lorient_KMA",
       "destination": "Vannes_KBE",
       "src-tp-id": "trx Lorient_KMA",
@@ -27,7 +27,7 @@
       }
     },
     {
-      "request-id": 1,
+      "request-id": "1",
       "source": "Brest_KLA",
       "destination": "Vannes_KBE",
       "src-tp-id": "trx Brest_KLA",
@@ -84,7 +84,7 @@
       }
     },
     {
-      "request-id": 3,
+      "request-id": "3",
       "source": "Lannion_CAS",
       "destination": "Rennes_STA",
       "src-tp-id": "trx Lannion_CAS",
@@ -110,7 +110,7 @@
       }
     },
     {
-      "request-id": 4,
+      "request-id": "4",
       "source": "Rennes_STA",
       "destination": "Lannion_CAS",
       "src-tp-id": "trx Rennes_STA",
@@ -136,7 +136,7 @@
       }
     },
     {
-      "request-id": 5,
+      "request-id": "5",
       "source": "Lorient_KMA",
       "destination": "Lannion_CAS",
       "src-tp-id": "trx Lorient_KMA",
@@ -180,38 +180,38 @@
   ],
   "synchronisation": [
     {
-      "synchonization-id": 0,
+      "synchonization-id": "0",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          0,
-          0
+          "0",
+          "0"
         ]
       }
     },
     {
-      "synchonization-id": 3,
+      "synchonization-id": "3",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          3,
-          4
+          "3",
+          "4"
         ]
       }
     },
     {
-      "synchonization-id": 5,
+      "synchonization-id": "5",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          5,
-          0
+          "5",
+          "0"
         ]
       }
     }
diff --git a/tests/data/meshTopologyExampleV2_services_expected.json b/tests/data/meshTopologyExampleV2_services_expected.json
index d02eadcb..19e405e8 100644
--- a/tests/data/meshTopologyExampleV2_services_expected.json
+++ b/tests/data/meshTopologyExampleV2_services_expected.json
@@ -1,7 +1,7 @@
 {
   "path-request": [
     {
-      "request-id": 0,
+      "request-id": "0",
       "source": "Lorient_KMA",
       "destination": "Vannes_KBE",
       "src-tp-id": "trx Lorient_KMA",
@@ -27,7 +27,7 @@
       }
     },
     {
-      "request-id": 1,
+      "request-id": "1",
       "source": "Brest_KLA",
       "destination": "Vannes_KBE",
       "src-tp-id": "trx Brest_KLA",
@@ -84,7 +84,7 @@
       }
     },
     {
-      "request-id": 3,
+      "request-id": "3",
       "source": "Lannion_CAS",
       "destination": "Rennes_STA",
       "src-tp-id": "trx Lannion_CAS",
@@ -110,7 +110,7 @@
       }
     },
     {
-      "request-id": 4,
+      "request-id": "4",
       "source": "Rennes_STA",
       "destination": "Lannion_CAS",
       "src-tp-id": "trx Rennes_STA",
@@ -136,7 +136,7 @@
       }
     },
     {
-      "request-id": 5,
+      "request-id": "5",
       "source": "Lorient_KMA",
       "destination": "Lannion_CAS",
       "src-tp-id": "trx Lorient_KMA",
@@ -180,38 +180,38 @@
   ],
   "synchronisation": [
     {
-      "synchonization-id": 0,
+      "synchonization-id": "0",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          0,
-          0
+          "0",
+          "0"
         ]
       }
     },
     {
-      "synchonization-id": 3,
+      "synchonization-id": "3",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          3,
-          4
+          "3",
+          "4"
         ]
       }
     },
     {
-      "synchonization-id": 5,
+      "synchonization-id": "5",
       "svec": {
         "relaxable": "False",
         "link-diverse": "True",
         "node-diverse": "True",
         "request-id-number": [
-          5,
-          0
+          "5",
+          "0"
         ]
       }
     }