#!/usr/bin/env python3 # -*- coding: utf-8 -*- ''' transmission_main_example.py ============================ Main example for transmission simulation. Reads from network JSON (by default, `edfa_example_network.json`) ''' from gnpy.core.equipment import load_equipment, trx_mode_params from gnpy.core.utils import db2lin, lin2db, write_csv from argparse import ArgumentParser from sys import exit from pathlib import Path from json import loads from collections import Counter from logging import getLogger, basicConfig, INFO, ERROR, DEBUG from numpy import arange, mean from matplotlib.pyplot import show, axis, figure, title from networkx import (draw_networkx_nodes, draw_networkx_edges, draw_networkx_labels, dijkstra_path) from gnpy.core.network import load_network, build_network, save_network from gnpy.core.elements import Transceiver, Fiber, Edfa, Roadm from gnpy.core.info import create_input_spectral_information, SpectralInformation, Channel, Power, Pref from gnpy.core.request import Path_request, RequestParams, compute_constrained_path, propagate logger = getLogger(__name__) def plot_results(network, path, source, destination): path_edges = set(zip(path[:-1], path[1:])) edges = set(network.edges()) - path_edges pos = {n: (n.lng, n.lat) for n in network.nodes()} labels = {n: n.location.city for n in network.nodes() if isinstance(n, Transceiver)} city_labels = set(labels.values()) for n in network.nodes(): if n.location.city and n.location.city not in city_labels: labels[n] = n.location.city city_labels.add(n.location.city) label_pos = pos fig = figure() kwargs = {'figure': fig, 'pos': pos} plot = draw_networkx_nodes(network, nodelist=network.nodes(), node_color='#ababab', **kwargs) draw_networkx_nodes(network, nodelist=path, node_color='#ff0000', **kwargs) draw_networkx_edges(network, edgelist=edges, edge_color='#ababab', **kwargs) draw_networkx_edges(network, edgelist=path_edges, edge_color='#ff0000', **kwargs) draw_networkx_labels(network, labels=labels, font_size=14, **{**kwargs, 'pos': label_pos}) title(f'Propagating from {source.loc.city} to {destination.loc.city}') axis('off') show() def main(network, equipment, source, destination, req = None): result_dicts = {} network_data = [{ 'network_name' : str(args.filename), 'source' : source.uid, 'destination' : destination.uid }] result_dicts.update({'network': network_data}) design_data = [{ 'power_mode' : equipment['Spans']['default'].power_mode, 'span_power_range' : equipment['Spans']['default'].delta_power_range_db, 'design_pch' : equipment['SI']['default'].power_dbm, 'baud_rate' : equipment['SI']['default'].baud_rate }] result_dicts.update({'design': design_data}) simulation_data = [] result_dicts.update({'simulation results': simulation_data}) power_mode = equipment['Spans']['default'].power_mode print('\n'.join([f'Power mode is set to {power_mode}', f'=> it can be modified in eqpt_config.json - Spans'])) 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) build_network(network, equipment, pref_ch_db, pref_total_db) path = compute_constrained_path(network, req) spans = [s.length for s in path if isinstance(s, Fiber)] print(f'\nThere are {len(spans)} fiber spans over {sum(spans):.0f}m between {source.uid} and {destination.uid}') print(f'\nNow propagating between {source.uid} and {destination.uid}:') try: power_range = list(arange(*equipment['SI']['default'].power_range_db)) last = equipment['SI']['default'].power_range_db[-2] if len(power_range) == 0 : #bad input that will lead to no simulation power_range = [0] #better than an error message else: power_range.append(last) except TypeError: print('invalid power range definition in eqpt_config, should be power_range_db: [lower, upper, step]') power_range = [0] for dp_db in power_range: req.power = db2lin(pref_ch_db + dp_db)*1e-3 print(f'\nPropagating with input power = {lin2db(req.power*1e3):.2f}dBm :') propagate(path, req, equipment, show=len(power_range)==1) print(f'\nTransmission result for input power = {lin2db(req.power*1e3):.2f}dBm :') print(destination) simulation_data.append({ 'Pch_dBm' : pref_ch_db + dp_db, 'OSNR_ASE_0.1nm' : round(mean(destination.osnr_ase_01nm),2), 'OSNR_ASE_signal_bw' : round(mean(destination.osnr_ase),2), 'SNR_nli_signal_bw' : round(mean(destination.osnr_nli),2), 'SNR_total_signal_bw' : round(mean(destination.snr),2) }) write_csv(result_dicts, 'simulation_result.csv') return path parser = ArgumentParser() parser.add_argument('-e', '--equipment', type=Path, default=Path(__file__).parent / 'eqpt_config.json') parser.add_argument('-pl', '--plot', action='store_true') parser.add_argument('-v', '--verbose', action='count', default=0, help='increases verbosity for each occurence') 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('-plb', '--power-lower-bound', default=0, help='power sweep lower bound') #parser.add_argument('-pub', '--power-upper-bound', default=1, help='power sweep upper bound') parser.add_argument('filename', nargs='?', type=Path, default=Path(__file__).parent / 'edfa_example_network.json') parser.add_argument('source', nargs='?', help='source node') parser.add_argument('destination', nargs='?', help='destination node') if __name__ == '__main__': args = parser.parse_args() basicConfig(level={0: ERROR, 1: INFO, 2: DEBUG}.get(args.verbose, DEBUG)) equipment = load_equipment(args.equipment) # logger.info(equipment) # print(args.filename) network = load_network(args.filename, equipment) # print(network) transceivers = {n.uid: n for n in network.nodes() if isinstance(n, Transceiver)} if not transceivers: exit('Network has no transceivers!') if len(transceivers) < 2: exit('Network has only one transceiver!') if args.list_nodes: for uid in transceivers: print(uid) exit() if args.source: source = transceivers.get(args.source) if not source: #TODO code a more advanced regex to find nodes match nodes_suggestion = [uid for uid in transceivers \ if args.source.lower() in uid.lower()] source = transceivers[nodes_suggestion[0]] \ if len(nodes_suggestion)>0 else list(transceivers.values())[0] print(f'invalid souce node specified,\ \n{args.source!r}, replaced with {source.uid}') del transceivers[source.uid] else: logger.info('No source node specified: picking random transceiver') source = list(transceivers.values())[0] if args.destination: destination = transceivers.get(args.destination) if not destination: nodes_suggestion = [uid for uid in transceivers \ if args.destination.lower() in uid.lower()] destination = transceivers[nodes_suggestion[0]] \ if len(nodes_suggestion)>0 else list(transceivers.values())[0] print(f'invalid destination node specified,\ \n{args.destination!r}, replaced with {destination.uid}') else: logger.info('No source node specified: picking random transceiver') destination = list(transceivers.values())[1] logger.info(f'source = {args.source!r}') logger.info(f'destination = {args.destination!r}') params = {} params['request_id'] = 0 params['trx_type'] = '' params['trx_mode'] = '' params['source'] = source.uid params['destination'] = destination.uid params['nodes_list'] = [destination.uid] params['loose_list'] = ['strict'] params['format'] = '' trx_params = trx_mode_params(equipment) if args.power: trx_params['power'] = db2lin(float(args.power))*1e-3 params.update(trx_params) req = Path_request(**params) path = main(network, equipment, source, destination, req) save_network(args.filename, network) if args.plot: plot_results(network, path, source, destination)