Supplement 72 to ITU-T G-series Recommendations (04/2021) Modelling consideration for optical media networks
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Supplement
4 Abbreviations and acronyms
5 Conventions
6 Introduction and background
7 Optical media
     7.1 The basic components of the mode
          7.1.1 The basic attenuator and filter
          7.1.2 Coupler-splitter
          7.1.3 The circulator
          7.1.4 The photodiode
     7.2 Complex assemblies
          7.2.1 The laser
          7.2.2 The coherent receiver
     7.3 Network considerations
          7.3.1 The media channel and information transfer
          7.3.2 The amplifier
               7.3.2.1 General considerations
               7.3.2.2 Erbium doped fibre amplifier (EDFA)
               7.3.2.3 Example of amplification using the Raman effect
          7.3.3 Optical time domain reflectometer (OTDR)
          7.3.4 Spectrum analyser
8 Monitoring and overhead (based on [ITU-T G.807])
     8.1 Overview
     8.2 OMS and OTS
     8.3 OTSi in context of OTU, OMS-O and OTS-O
     8.4 Function blocks and network considerations
          8.4.1 OTS and amplification
          8.4.2 OTS network considerations
          8.4.3 OMS
          8.4.4 OMS in an amplifier node
          8.4.5 The layered model, similarities and differences
          8.4.6 OMS network considerations
          8.4.7 Signal, channel, overhead, grouping and assembly considerations
               8.4.7.1 Signal (Si)
               8.4.7.2 Media channel (MC)
               8.4.7.3 Guard band
               8.4.7.4 Photonic (p) and electronic (e)
               8.4.7.5 Group (G)
               8.4.7.6 Monitoring
               8.4.7.7 Overhead (O)
               8.4.7.8 Assembly (A)
               8.4.7.9 Application of G, O and A terminology
          8.4.8 Subdividing the media channel
               8.4.8.1 Simple subdivision of the media channel
               8.4.8.2 The MCA LTP and the NMCA
               8.4.8.3 Multiple levels of subdivision
          8.4.9 Point to point and multi-pointed media channels
               8.4.9.1 Point to point media channels
               8.4.9.2 Multi-pointed media channels
               8.4.9.3 Partial mesh
          8.4.10 Planning channels
               8.4.10.1 Planning approaches
               8.4.10.2 A mixed planning example
               8.4.10.3 Abstracting the MCs
               8.4.10.4 Dealing with TCM and mapping to OAM (MEP/MIP, etc.) pattern
               8.4.10.5 Dealing with the route through the MC mesh
          8.4.11 NMCA FC and dealing with the "OTSiA coordination"
          8.4.12 Adding the OTSiA termination
          8.4.13 Multiple levels of MCA in a ROADM
          8.4.14 MCA network considerations
          8.4.15 A disaggregated node
               8.4.15.1 Single OTSi per ROADM tributary with single OTSi per OTSiA
               8.4.15.2 Single OTSi per ROADM tributary with multiple OTSis per OTSiA
               8.4.15.3 Multiple OTSi per ROADM tributary with multiple OTSis per OTSiA
               8.4.15.4 Transponder with each OTSiA spread across several multi-channel AccessPorts
               8.4.15.5 Transponder with the network MCAs extended to the transponder
               8.4.15.6 Dealing with propagation of overhead in a disaggregated solution
          8.4.16 Rationale for groupings
          8.4.17 Spec model enhancements supporting the composite LTPs and FCs
     8.5 Measurement and configuration considerations
          8.5.1 Relevant properties
               8.5.1.1 Summary properties
               8.5.1.2 Spectrum properties
                    8.5.1.2.1 Channel
                    8.5.1.2.2 Alternative expression of channel spectrum
                    8.5.1.2.3 Grid
               8.5.1.3 Modulated signal properties
               8.5.1.4 Channel properties
                    8.5.1.4.1 Channel summary
                    8.5.1.4.2 Channel entry effects
                    8.5.1.4.3 Channel loss
                    8.5.1.4.4 Channel dispersion
                    8.5.1.4.5 Channel signal crosstalk properties
               8.5.1.5 Laser properties
               8.5.1.6 Modulator properties
               8.5.1.7 Receiver properties
               8.5.1.8 Power properties
               8.5.1.9 FEC properties
               8.5.1.10 Channel trace
               8.5.1.11 Signal source label
               8.5.1.12 Signal characteristics
               8.5.1.13 Far end indications
          8.5.2 Attributes related to each property
               8.5.2.1 Requested/Intended
               8.5.2.2 Current/actual – measure
               8.5.2.3 Threshold – measure
               8.5.2.4 Alarms
               8.5.2.5 Capability (requested/intended, current, threshold and alarms)
          8.5.3 Considering tandem connection monitoring and mapping to OAM (MEP/MIP, etc.) pattern
9 The relationship between functional and physical
     9.1 Overview
     9.2 The field replaceable unit (FRU)
10 Other photonic cases
     10.1 Passive optical networks
Bibliography
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