1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.989.3 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (11/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local an
2、d access networks 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification Amendment 1 Recommendation ITU-T G.989.3 (2015) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNEC
3、TIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR
4、 SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYST
5、EM G.900G.999 General G.900G.909 Parameters for optical fibre cable systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM tra
6、nsmission bearers G.940G.949 Digital line systems G.950G.959 Digital section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Metallic access networks G.990G.999 MULT
7、IMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the li
8、st of ITU-T Recommendations. Rec. ITU-T G.989.3 (2015)/Amd.1 (11/2016) i Recommendation ITU-T G.989.3 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification Amendment 1 Summary Recommendation ITU-T G.989.3 specifies the transmission convergence layer of 4
9、0 Gigabit-capable passive optical network (NG-PON2) systems providing optical access for residential, business, mobile backhaul and other applications. A NG-PON2 system supports multiple wavelength channels and enables flexibility to add capacity as the demand grows to 100 Gbit/s and beyond. A NG-PO
10、N2 system may contain a set of time and wavelength division multiplexing (TWDM) channels, or a set of point-to-point wavelength division multiplexing (PtP WDM) channels, or both. The TWDM channels operate at the nominal line rates of 9.95328 and 2.48832 Gbit/s in both downstream and upstream directi
11、ons. The PtP WDM channels support nominal line rate classes of 1.25 Gbit/s, 2.5 Gbit/s and 10 Gbit/s, depending on the PtP WDM client. The transmission convergence (TC) layer is the protocol layer of the NG-PON2 system that is positioned between the physical media dependent (PMD) layer and service c
12、lients. It builds on the Recommendation ITU-T G.987.3, with modifications for NG-PON2 specific features. This Recommendation forms an integral part of the ITU-T G.989 series of Recommendations (ITU-T G.989, ITU-T G.989.1 and ITU-T G.989.2) that, together with the ONU management and control interface
13、 (OMCI), Recommendation ITU-T G.988, specifies a coherent set of access transmission systems. The NG-PON2 system is also a member of the ITU-T G.9802 family. Amendment 1 contains necessary additional details and clarifications for the Recommendation and provides regular specification maintenance. Hi
14、story Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.989.3 2015-10-22 15 11.1002/1000/12562 1.1 ITU-T G.989.3 (2015) Amd.1 2016-11-13 15 11.1002/1000/13119 Keywords Auxiliary management and control channel transmission convergence, AMCC TC, framing sublayer, FS, 40 Gigabit-capabl
15、e passive optical network, NG-PON2, point-to-point wavelength division multiplexing, PtP WDM, time and wavelength division multiplexing subsystem transmission convergence, TWDM TC. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed b
16、y the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.989.3 (2015)/Amd.1 (11/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication t
17、echnologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Te
18、lecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some
19、 areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized
20、 operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words
21、“shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the
22、 practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation d
23、evelopment process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are theref
24、ore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.989.3 (2015)/Amd.1 (11/2016) iii Table of Contents Pa
25、ge 1 Scope . 1 2 References . 2 3 Definitions 3 4 Abbreviations and acronyms 3 5 Conventions 3 6 NG-PON2 transmission convergence layer overview 3 6.1 TWDM transmission convergence layer 3 6.2 PtP WDM AMCC transmission convergence layer overview . 17 7 TWDM resource allocation and quality of service
26、 . 21 7.1 Principles of downstream and upstream resource allocation . 21 7.2 Dynamic bandwidth assignment overview . 23 7.3 Reference model of dynamic bandwidth assignment . 25 7.4 DBA performance requirements . 29 8 NG-PON2 transmission convergence framing sublayer . 30 8.1 TWDM transmission conver
27、gence framing sublayer . 30 8.2 PtP WDM management framing sublayer 37 9 TWDM encapsulation method 39 9.1 XGEM framing . 39 9.2 XGEM frame delineation . 41 9.3 SDU fragmentation . 41 9.4 Mapping of services into XGEM frames 43 10 NG-PON2 PHY adaptation sublayer 44 10.1 TWDM PHY adaptation sublayer 4
28、4 10.2 PtP WDM management PHY adaptation sublayer . 57 11 NG-PON2 PLOAM messaging channel . 60 11.1 Overview 60 11.2 PLOAM message format 61 11.3 PLOAM message definitions . 65 12 NG-PON2 ONU activation . 97 12.1 TWDM PON ONU activation cycle . 97 12.2 PtP WDM ONU activation cycle . 113 13 NG-PON2 O
29、LT and ONU timing relationships . 122 13.1 TWDM ONU transmission timing and equalization delay 122 13.2 Time of day distribution over TWDM Channel . 130 13.3 PtP WDM ONU transmission timing . 133 iv Rec. ITU-T G.989.3 (2015)/Amd.1 (11/2016) Page 14 TWDM performance monitoring, supervision and defect
30、s 133 14.1 Performance monitoring . 133 14.2 Defects 146 15 TWDM security 150 15.1 Threat model for NG-PON2 . 150 15.2 Authentication 150 15.3 Key derivation 153 15.4 XGEM payload encryption system 155 15.5 Data encryption key exchange and activation mechanism . 157 15.6 Integrity protection and dat
31、a origin verification for PLOAM 164 15.7 Integrity protection and data origin verification for OMCI 165 15.8 Integrity and data origin verification key switching . 166 15.9 NG-PON2 systems with reduced data encryption strength 168 16 NG-PON2 power management . 169 16.1 TWDM power management . 170 16
32、.2 PtP WDM power management . 178 17 TWDM channel management . 180 17.1 Profile announcement . 180 17.2 ONU calibration . 185 17.3 ONU wavelength channel handover . 186 17.4 ONU wavelength channel locking 196 18 TWDM system protection 197 18.1 OLT CT coordination in 1:1 Type B protection . 197 18.2
33、OLT CT Type B protection state machine . 198 18.3 Simplified state transition diagram . 204 19 Rogue behaviour and its mitigation 206 19.1 Rogue ONU behaviour model in TWDM-PON . 206 19.2 Rogue ONU behaviour model for PtP WDM . 206 19.3 Behaviour model when coexisting with ITU-T G.984 and ITU-T G.98
34、7 ONUs 207 19.4 Protection from noise and alien ONUs . 207 19.5 Troublesome ONU presence detection enabled through idle window . 207 Annex A Hybrid error control (HEC) decoding and scrambler sequence codes 208 A.1 HEC decoding 208 A.2 Scrambler sequence 210 Annex B Forward error correction using sho
35、rtened Reed-Solomon codes 212 Annex C Secure mutual authentication via OMCI . 213 Annex D Secure mutual authentication using IEEE 802.1X 214 Annex E Auxiliary management and control channel 215 Rec. ITU-T G.989.3 (2015)/Amd.1 (11/2016) v Page Annex F Tuning sequences . 216 F.1 Tuning sequences . 216
36、 F.2 Definition of TC layer tuning time . 220 Annex G Transcoded framing with FEC and OAM for PtP WDM AMCC TC . 221 G.1 Services with 8B/10B line code . 221 G.2 Services with 64B/66B line code . 223 Appendix I Downstream line data pattern conditioning . 225 Appendix II Time of day derivation and err
37、or analysis 226 Appendix III Burst profiles . 230 Appendix IV Golden vectors 232 IV.1 10G downstream and upstream FEC codeword . 232 IV.2 10G upstream FEC short codeword . 232 IV.3 2.5G downstream and upstream FEC codeword 233 IV.4 2.5G downstream FEC short codeword 233 IV.5 2.5G upstream FEC short
38、codeword 233 IV.6 Downstream AES-128 encryption 234 IV.7 Upstream AES-128 encryption . 234 IV.8 Key derivation encryption 235 IV.9 Downstream PLOAM message integrity check . 235 IV.10 Upstream PLOAM message integrity check 235 IV.11 Upstream key reporting 236 IV.12 Downstream OMCI message integrity
39、check . 236 Appendix V Protection examples . 237 Appendix VI ICTP: Inter-channel-termination protocol 238 VI.1 ICTP use cases 238 VI.2 ICTP primitives description . 240 Appendix VII ONU equalization delay coordination across TWDM channels 244 VII.1 Re-ranging 244 VII.2 Consistent equalization delay
40、method 245 VII.3 EqD pre-configuration 247 Appendix VIII PON-ID and NG-PON2 system identifier examples 249 Appendix IX Cooperative DBA by client systems for low-latency services 250 IX.1 PON application to low-latency services and its challenge 250 IX.2 Cooperative DBA by client systems . 251 IX.3 U
41、se case mobile fronthaul . 251 IX.4 Reference Point 253 Bibliography. 255 Rec. ITU-T G.989.3 (2015)/Amd.1 (11/2016) 1 Recommendation ITU-T G.989.3 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification Amendment 1 Editorial note: This is a complete-text p
42、ublication. Except for clause 18, clause IV.4 and Appendix IX, modifications introduced by this amendment are shown in revision marks relative to Recommendation ITU-T G.989.3 (2015). 1 Scope This Recommendation specifies the transmission convergence layer of 40 Gigabit-capable passive optical networ
43、k (NG-PON2) systems providing optical access for residential, business, mobile backhaul, and other applications. This Recommendation specifies: the supported nominal line rate combinations and the layered structure of the NG-PON2 time and wavelength division multiplexing subsystem transmission conve
44、rgence (TWDM TC) layer; functionality of the TWDM TC service adaptation sublayer, including the use of 10-Gigabit passive optical network (XG-PON) encapsulation method (XGEM), XGEM frame delineation and service data unit (SDU) fragmentation; functionality of the TWDM TC framing sublayer with the spe
45、cification of the downstream frame and upstream burst formats; functionality of the TWDM TC physical interface (PHY) adaptation sublayer, including synchronization, forward error correction and scrambling; TWDM PON embedded management functionality, including upstream time-division multiple access a
46、nd dynamic bandwidth assignment mechanisms; the NG-PON2 physical layer operation, administration and management (PLOAM) messaging channel; the optical network unit (ONU) activation cycle state machine, covering activation and wavelength channel handover; timing aspects of TWDM PON point-to-multipoin
47、t operation and time-of-day communication; TWDM performance monitoring, supervision, and defects; TWDM security including cryptographic mechanisms for authentication, integrity verification, channel isolation and data protection along with the associated key exchange protocols; signalling mechanisms
48、 and protocols to support ONU power management; TWDM wavelength channel management; TWDM system protection; alien device and rogue ONU behaviour mitigation; the layered structure of the NG-PON2 PtP WDM subsystem auxiliary management and control channel transmission convergence (AMCC TC) layer; 2 Rec
49、. ITU-T G.989.3 (2015)/Amd.1 (11/2016) AMCC TC layer functionality for transparent mode; AMCC TC layer functionality for transcoded mode; functionality of the AMCC TC management service adaptation sublayer; functionality of the AMCC TC framing sublayer; functionality of the AMCC TC PHY adaptation sublayer; functionality of the PtP WDM management framing sublayer; specification of the management data unit (MDU) mapping for AMCC
