Recommendation ITU-T G.9807.1 describes a 10-Gigabit-capable symmetric passive optical network (XGS-PON) system in an optical access network for residential, business, mobile backhaul and other applications. This system operates over a point-to-multipoint optical access infrastructure at the
nominal data rate of 10 Gbit/s both in the downstream and the upstream directions. This Recommendation contains the common definitions, acronyms, abbreviations, conventions, general requirements, physical media dependent layer requirements, and transmission convergence layer requirements of the XGS-PON system.Amendment 1 to Recommendation ITU-T G.9807.1 (2016) contains necessary additional details and clarifications for the Recommendation, and provides regular specification maintenance.
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Table of Contents
1 Scope............................................................................................................................. 1
2 References..................................................................................................................... 1
3 Definitions .................................................................................................................... 4
3.1 Terms defined elsewhere................................................................................ 4
3.2 Terms defined in this Recommendation......................................................... 7
4 Abbreviations and acronyms ........................................................................................ 10
5 Conventions .................................................................................................................. 17
5.1 Optical access concepts .................................................................................. 17
5.2 Multi-wavelength PON system reference points............................................ 18
5.3 Optical power and loss parameters................................................................. 18
5.4 Dynamic range, sensitivity and overload ....................................................... 19
5.5 Sensitivity and overload in the presence of FEC............................................ 19
5.6 Reach and distance ......................................................................................... 19
5.7 Use of the term PON ...................................................................................... 20
5.8 Use of the term ODN...................................................................................... 21
5.9 Use of the terms ONU and ONT .................................................................... 21
5.10 Use of the terms T-CONT and Alloc-ID........................................................ 21
5.11 Use of the terms bandwidth assignment and bandwidth allocation ............... 22
5.12 Use of the terms band and range .................................................................... 22
5.13 Transmitter enable control and associated transient times............................. 22
6 Overview of the XGS-PON Recommendation............................................................. 23
Annex A – General requirements of XGS-PON...................................................................... 25
A.5 Architecture of the optical access network..................................................... 25
A.6 Migration scenarios ........................................................................................ 33
A.7 Service requirements ...................................................................................... 38
A.8 Physical layer requirements............................................................................ 43
A.9 System level requirements.............................................................................. 45
A.10 Operational requirements ............................................................................... 46
A.11 Resilience and protection on ODN................................................................. 47
Appendix A.I – Examples of practical XGS-PON system architecture .................................. 49
Appendix A.II – Synchronizing requirements for wireless in CBU scenario.......................... 62
Appendix A.III – External access network back-up ................................................................ 63
Appendix A.IV – Operation with IEEE 1588 .......................................................................... 66
Appendix A.V – Use cases for frequency and time of day synchronization ........................... 67
Appendix A.VI – Transport of ESMC messages over PON.................................................... 72
Annex B – Physical media dependent (PMD) layer specifications of XGS-PON................... 74
B.6 Architecture of the optical access network..................................................... 74
B.7 Services........................................................................................................... 75
B.8 User network interface and service node interface......................................... 75
B.9 Optical network requirements ........................................................................ 76
B.10 X/S tolerance of XGS-PON ONU.................................................................. 91
B.11 Upstream physical layer overhead.................................................................. 93
Appendix B.I – Examples of wavelength allocation for XGS-PON, G-PON and video
distribution services...................................................................................................... 94
Appendix B.II – Physical layer measurements required to support optical layer
supervision.................................................................................................................... 95
Appendix B.III – Allocation of the physical layer overhead time ........................................... 97
Appendix B.IV – Jitter budget specifications .......................................................................... 100
Appendix B.V – Measurement of burst mode acquisition time and burst mode eye
opening at OLT............................................................................................................. 104
Appendix B.VI – Upstream PMD examples for XGS-PON.................................................... 107
Appendix B.VII – Raman analysis in XGS-PON optional wavelength set ............................. 109
Annex C – Transmission convergence layer specifications of XGS-PON.............................. 111
C.6 XGS-PON transmission convergence layer overview ................................... 111
C.7 Resource allocation and quality of service..................................................... 123
C.8 XGS-PON transmission convergence framing sublayer overview ................ 132
C.9 XGS-PON encapsulation method................................................................... 139
C.10 XGS-PON PHY adaptation sublayer.............................................................. 143
C.11 PLOAM messaging channel........................................................................... 154
C.12 XGS-PON ONU activation ............................................................................ 173
C.13 XGS-PON OLT and ONU timing relationships............................................. 183
C.14 XGS-PON performance monitoring, supervision and defects ....................... 193
C.15 XGS-PON security ......................................................................................... 201
C.16 XGS-PON power management ...................................................................... 219
C.17 Channel management ..................................................................................... 228
C.18 XGS-PON system protection ......................................................................... 228
C.19 Rogue behaviour and its mitigation................................................................ 236
Annex C.A – Hybrid error control (HEC) decoding and scrambler sequence codes .............. 238
Annex C.B – Forward error-correction using shortened Reed-Solomon codes ...................... 242
Annex C.C – Secure mutual authentication via OMCI............................................................ 243
Annex C.D – Secure mutual authentication using IEEE 802.1X............................................. 244
Annex C.E – Auxiliary management and control channel....................................................... 245
Annex C.F – Tuning sequences ............................................................................................... 246
Annex C.G – Transcoded framing with FEC and OAM for PtP WDM AMCC TC ............... 247
Appendix C.I – Downstream line data pattern conditioning ................................................... 248
Appendix C.II – Time of day derivation and error analysis .................................................... 249
Appendix C.III – Burst profiles ............................................................................................... 253
Appendix C.IV – Golden vectors............................................................................................. 255
Appendix C.V – Protection examples...................................................................................... 259
Appendix C.VI – ICTP: Inter-channel-termination protocol................................................... 260
Appendix C.VII – ONU equalization delay coordination across TWDM channels................ 264
Appendix C.VIII – PON-ID examples..................................................................................... 265
Appendix I – Introduction of PMD parameters ....................................................................... 266
I.1 Relationship between OMA, extinction ratio, and average power................. 266
Appendix II – General statements on the relationship with NG-PON2 TC layer
requirements ................................................................................................................. 267
Appendix III – Use of 10GEPON 10GBASE-PR-D3 (OLT) and 10GBASE-PR-U3
(ONU) optical modules with XGS-PON symmetric .................................................... 275
Bibliography............................................................................................................................. 279
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