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 (10/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA,IGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access netwo
2、rks 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification Recommendation ITU-T G.989.3 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACT
3、ERISTICS 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 SATELLITE LINKS AND INTERCONNECTION WITH MET
4、ALLIC 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 SYSTEM G.900G.999 General G.900G.909 Parameters f
5、or 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 transmission bearers G.940G.949 Digital line sys
6、tems 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 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GEN
7、ERIC 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 list of ITU-T Recommendations. Rec. ITU-T G.989
8、.3 (10/2015) i Recommendation ITU-T G.989.3 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification Summary Recommendation ITU-T G.989.3 specifies the transmission convergence layer of 40 Gigabit-capable passive optical network (NG-PON2) systems providing
9、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-PON2 system may contain a set of time and wavelength division multiplexi
10、ng (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 directions. The PtP WDM channels support nominal line rate classes of 1.25 Gb
11、it/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 clients. It builds on the Recommendation ITU-T G.987.3, with modificati
12、ons 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 (OMCI), Recommendation ITU-T G.988, specifies a coherent set of acces
13、s transmission systems. The NG-PON2 system is also a member of the ITU-T G.9802 family. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.989.3 2015-10-22 15 11.1002/1000/12562 Keywords Auxiliary management and control channel transmission convergence, AMCC TC, framing subla
14、yer, FS, 40 Gigabit-capable 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 yo
15、ur web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.989.3 (10/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and co
16、mmunication technologies (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.
17、 The World Telecommunication 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 Resoluti
18、on 1. In some 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
19、 a recognized 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 me
20、t. The words “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 possibi
21、lity that the 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 Rec
22、ommendation development 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 a
23、nd are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 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 (10/2015) iii Table of Contents Pa
24、ge 1 Scope . 1 2 References . 2 3 Definitions 2 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
25、 . 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
26、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
27、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
28、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 . 129 13.3 PtP WDM ONU transmission timing . 132 14 TWDM performance monitoring, supervision and defects 132 14.1 Performance monitoring . 132 iv Rec. IT
29、U-T G.989.3 (10/2015) Page 14.2 Defects 143 15 TWDM security 146 15.1 Threat model for NG-PON2 . 146 15.2 Authentication 147 15.3 Key derivation 149 15.4 XGEM payload encryption system 151 15.5 Data encryption key exchange and activation mechanism . 154 15.6 Integrity protection and data origin veri
30、fication for PLOAM 160 15.7 Integrity protection and data origin verification for OMCI 161 15.8 Integrity and data origin verification key switching . 162 15.9 NG-PON2 systems with reduced data encryption strength 164 16 NG-PON2 power management . 165 16.1 TWDM power management . 165 16.2 PtP WDM po
31、wer management . 174 17 TWDM channel management . 175 17.1 Profile announcement . 176 17.2 ONU calibration . 181 17.3 ONU wavelength channel handover . 182 17.4 ONU wavelength channel locking 192 18 TWDM system protection 192 18.1 OLT CT coordination in 1:1 type B dual parenting protection 192 18.2
32、OLT CT state coordination using inter-channel-termination protocol . 196 19 Rogue behaviour and its mitigation 196 19.1 Rogue ONU behaviour model in TWDM-PON . 196 19.2 Rogue ONU behaviour model for PtP WDM . 197 19.3 Behaviour model when coexisting with ITU-T G.984 and ITU-T G.987 ONUs 197 19.4 Pro
33、tection from noise and alien ONUs . 197 19.5 Troublesome ONU presence detection enabled through idle window . 197 Annex A Hybrid error control (HEC) decoding and scrambler sequence codes 198 A.1 HEC decoding 198 A.2 Scrambler sequence 200 Annex B Forward error correction using shortened Reed-Solomon
34、 codes 202 Annex C Secure mutual authentication via OMCI . 203 Annex D Secure mutual authentication using IEEE 802.1X 204 Annex E Auxiliary management and control channel 205 Annex F Tuning sequences . 206 F.1 Tuning sequences . 206 F.2 Definition of TC layer tuning time . 210 Rec. ITU-T G.989.3 (10
35、/2015) v Page Annex G Transcoded framing with FEC and OAM for PtP WDM AMCC TC . 211 G.1 Services with 8B/10B line code . 211 G.2 Services with 64B/66B line code . 213 Appendix I Downstream line data pattern conditioning . 215 Appendix II Time of day derivation and error analysis 216 Appendix III Bur
36、st profiles . 220 Appendix IV Golden vectors 222 IV.1 10G downstream and upstream FEC codeword . 222 IV.2 10G upstream FEC short codeword . 222 IV.3 2.5G downstream and upstream FEC codeword 223 IV.4 2.5G downstream and upstream FEC short codeword . 223 IV.5 Downstream AES-128 encryption 224 IV.6 Up
37、stream AES-128 encryption . 224 IV.7 Key derivation encryption 225 IV.8 Downstream PLOAM message integrity check . 225 IV.9 Upstream PLOAM message integrity check 225 IV.10 Upstream key reporting 225 IV.11 Downstream OMCI message integrity check . 225 Appendix V Protection examples . 227 Appendix VI
38、 ICTP: Inter-channel-termination protocol 228 VI.1 ICTP use cases 228 VI.2 ICTP primitives description . 230 Appendix VII ONU equalization delay coordination across TWDM channels 235 VII.1 Re-ranging 235 VII.2 Consistent equalization delay method 236 VII.3 EqD pre-configuration 238 Appendix VIII PON
39、-ID and NG-PON2 system identifier examples 239 Bibliography. 240 Rec. ITU-T G.989.3 (10/2015) 1 Recommendation ITU-T G.989.3 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification 1 Scope This Recommendation specifies the transmission convergence layer of
40、 40 Gigabit-capable passive optical network (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
41、 multiplexing subsystem transmission convergence (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
42、 the TWDM TC framing sublayer with the specification 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, includin
43、g upstream time-division multiple access and 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; tim
44、ing aspects of TWDM PON point-to-multipoint 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
45、 exchange protocols; signalling mechanisms 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 trans
46、mission convergence (AMCC TC) layer; 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 subl
47、ayer; functionality of the PtP WDM management framing sublayer; 2 Rec. ITU-T G.989.3 (10/2015) specification of the management data unit (MDU) mapping for AMCC PtP WDM management channel; specification of the PtP WDM management frame format; functionality of the PtP WDM management PHY adaptation sub
48、layer; the PtP WDM ONU activation cycle. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations an
49、d other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU
