1、 International Telecommunication Union ITU-T G.987.3TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2014) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access networks 10-Gigabit-capable passive
2、optical networks (XG-PON): Transmission convergence (TC) layer specification Recommendation ITU-T G.987.3 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANAL
3、OGUE 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 METALLIC LINES G.400G.449 COOR
4、DINATION 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 for optical fibre cable syst
5、ems 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 systems G.950G.959 Digital sec
6、tion 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.989Metallic access networks G.990G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECT
7、S 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.987.3 (01/2014) i Recommendatio
8、n ITU-T G.987.3 10-Gigabit-capable passive optical networks (XG-PON): Transmission convergence (TC) layer specification Summary Recommendation ITU-T G.987.3 describes the transmission convergence layer for 10-gigabit-capable passive optical network systems a family of flexible access network systems
9、 that operate over a point-to-multipoint optical access infrastructure at nominal data rates in the order of 10.0 Gbit/s in at least one direction, while providing a wide range of broadband and narrow-band services to end-users. History Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T
10、 G.987.3 2010-10-07 15 11.1002/1000/10890 1.1 ITU-T G.987.3 (2010) Amd. 1 2012-06-22 15 11.1002/1000/11535 2.0 ITU-T G.987.3 2014-01-13 15 11.1002/1000/12098 Keywords Optical access network, passive optical network, 10-gigabit PON, XGEM, XGTC. _ *To access the Recommendation, type the URL http:/hand
11、le.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.987.3 (01/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
12、telecommunications, information and communication 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 te
13、lecommunications on a worldwide basis. 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 th
14、e procedure laid down in WTSA Resolution 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
15、a telecommunication administration and 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 al
16、l of these mandatory provisions are met. 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 RI
17、GHTS ITU draws attention to the possibility 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 I
18、TU members or others outside of the Recommendation 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
19、 not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2014 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.9
20、87.3 (01/2014) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 2 5 Conventions 2 6 XG-PON transmission convergence layer overview 2 6.1 XGTC layer structure . 2 6.2 XGTC sublayer functions . 4 6.3 Management of an XG-PON system 6 6.4 Time division mu
21、ltiplexing architecture 7 6.5 Media access control 10 7 Resource allocation and quality of service . 11 7.1 Principles of downstream and upstream resource allocation . 11 7.2 Dynamic bandwidth assignment overview . 13 7.3 Reference model of dynamic bandwidth assignment . 15 7.4 DBA performance requi
22、rements . 19 8 XG-PON transmission convergence layer framing 20 8.1 Downstream XGTC framing 20 8.2 Upstream XGTC framing . 24 9 XG-PON encapsulation method . 26 9.1 XGEM framing . 26 9.2 XGEM frame delineation . 28 9.3 SDU fragmentation . 29 9.4 Mapping of services into XGEM frames 30 10 PHY adaptat
23、ion sublayer 31 10.1 Downstream PHY frame 31 10.2 Upstream PHY frames and upstream PHY bursts 34 10.3 Forward error correction . 35 10.4 Scrambling 38 11 PLOAM messaging channel . 39 11.1 Overview 39 11.2 PLOAM message format 40 11.3 PLOAM message definitions . 42 12 ONU activation . 52 12.1 Overvie
24、w 52 12.2 Activation mechanism at the ONU . 53 12.3 OLT support of the activation process . 59 iv Rec. ITU-T G.987.3 (01/2014) Page 13 OLT and ONU timing relationships . 60 13.1 ONU transmission timing and equalization delay 60 13.2 Time of day distribution over XG-PON . 67 14 Performance monitoring
25、, supervision, and defects. 69 14.1 Performance monitoring . 70 14.2 Defects 74 15 XG-PON security 76 15.1 Threat model for XG-PON . 76 15.2 Authentication 76 15.3 Key derivation 79 15.4 XGEM payload encryption system 80 15.5 Data encryption key exchange and activation mechanism . 82 15.6 Integrity
26、protection and data origin verification for PLOAM 88 15.7 Integrity protection and data origin verification for OMCI 89 15.8 Integrity and data origin verification key switching . 90 15.9 XG-PON systems with reduced data encryption strength 92 16 ONU power management . 93 16.1 Power management confi
27、guration and signalling 94 16.2 Power management parameter definitions . 94 16.3 Power management state machine specifications . 95 16.4 Management transactions during low power mode 102 Annex A Hybrid error correction (HEC) decoding and scrambler sequence . 104 A.1 HEC decoding 104 A.2 Scrambler se
28、quence 106 Annex B Forward error correction using shortened Reed-Solomon codes 108 B.1 Polynomial representation over Galois field 108 B.2 Construction of RS(248, 232) codeword 108 B.3 Construction of RS(248, 216) codeword 109 Annex C Secure mutual authentication via OMCI . 111 Annex D Secure mutual
29、 authentication based on IEEE 802.1X . 112 D.1 Introduction 112 D.2 Stack model for XG-PON authentication using IEEE 802.1X 113 D.3 Behaviour at network entry 113 Annex E PON-ID maintenance . 115 E.1 Introduction 115 E.2 PON-ID structure 115 Annex F Extended rogue ONU mitigation capabilities 117 F.1
30、 Introduction 117 F.2 Extra codepoint of disable PLOAM message type . 117 Rec. ITU-T G.987.3 (01/2014) v Page F.3 Extra transition of the ONU activation cycle state transition diagram . 118 Appendix I Downstream line data pattern conditioning . 120 I.1 Spectrum control using idle XGEM frames . 120 I
31、.2 Intentional PON disruption . 122 Appendix II Time of day derivation and error analysis 124 Appendix III Burst profiles . 128 Appendix IV Golden vectors 130 IV.1 Downstream FEC codeword . 130 IV.2 Upstream FEC codeword . 130 IV.3 Upstream FEC short codeword 131 IV.4 Downstream AES-128 encryption 1
32、31 IV.5 Upstream AES-128 encryption . 132 IV.6 Key derivation encryption 132 IV.7 Downstream PLOAM message integrity check . 132 IV.8 Upstream PLOAM message integrity check 133 IV.9 Upstream key reporting 133 IV.10 Downstream OMCI message integrity check . 133 Bibliography. 134 Rec. ITU-T G.987.3 (0
33、1/2014) 1 Recommendation ITU-T G.987.3 10-Gigabit-capable passive optical networks (XG-PON): Transmission convergence (TC) layer specification 1 Scope This Recommendation describes the transmission convergence layer for 10-Gigabit-capable passive optical network (XG-PON) systems a family of flexible
34、 access network systems that operate over a point-to-multipoint optical access infrastructure at the nominal data rate of 10.0 Gbit/s in at least the downstream direction, while providing a wide range of broadband and narrow-band services to end-users. This Recommendation specifies: the layered stru
35、cture of the XG-PON transmission convergence (XGTC) layer; functionality of the service adaptation sublayer, including XG-PON encapsulation method (XGEM), XGEM frame delineation, and service data unit (SDU) fragmentation; functionality of the framing sublayer with the specification of the downstream
36、 XG-PON frame and upstream burst formats; functionality of the physical interface (PHY) adaptation sublayer, including forward error correction and scrambling; XG-PON embedded management functionality, including upstream time-division multiple access and dynamic bandwidth assignment mechanisms; the
37、XG-PON physical layer operation, administration and management (OAM) messaging channel; the optical network unit (ONU) activation method; timing aspects of point-to-multipoint operation and time-of-day communication; cryptographic mechanisms for authentication, integrity verification, channel isolat
38、ion and data protection along with and the associated key exchange protocols; signalling mechanisms and protocols to support ONU power saving. This Recommendation forms an integral part of the ITU-T G.987 series of ITU-T Recommendations ITU-T G.987, ITU-T G.987.1, ITU-T G.987.2 that, together with I
39、TU-T G.988, specify a single coherent set of access transmission systems. 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 w
40、ere valid. All Recommendations and 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 Recommen
41、dations 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-T G.652 Recommendation ITU-T G.652 (2009), Characteristics of a single-mode optical fibre and cable. ITU-T G.709 Recommendation ITU-
42、T G.709/Y.1331 (2012), Interfaces for the Optical Transport Network. 2 Rec. ITU-T G.987.3 (01/2014) ITU-T G.987 Recommendation ITU-T G.987 (2012), 10-Gigabit-capable passive optical network (XG-PON) systems: Definitions, abbreviations and acronyms. ITU-T G.987.1 Recommendation ITU-T G.987.1 (2010),
43、10-Gigabit-capable passive optical networks (XG-PON): General requirements. ITU-T G.987.2 Recommendation ITU-T G.987.2 (2010), 10 Gigabit-capable passive optical networks (XG-PON): Physical media dependent (PMD) layer specification. ITU-T G.988 Recommendation ITU-T G.988 (2012), Optical network unit
44、 management and control interface specification. ITU-T I.432.1 Recommendation ITU-T I.432.1 (1999), B-ISDN user-network interface Physical layer specification: General characteristics. ATIS-0300220 ATIS-0300220.2011, Representation Of The Communications Industry Manufacturers, Suppliers, and Related
45、 Service Companies for Information Exchange. IEEE 802.1X IEEE Standard 802.1X-2010, IEEE Standard for Local and metropolitan area networks Port-Based Network Access Control. IETF RFC 3748 IETF RFC 3748 (2004), Extensible Authentication Protocol (EAP). IETF RFC 5216 IETF RFC 5216 (2008), The EAP-TLS
46、Authentication Protocol. IETF RFC 5247 IETF RFC 5247 (2008), Extensible Authentication Protocol (EAP) Key Management Framework. IETF RFC 5433 IETF RFC 5433 (2009), Extensible Authentication Protocol Generalized Pre-Shared Key (EAP-GPSK) Method. NIST FIPS-197 NIST Federal Information Processing Stand
47、ards Publication 197 (2001), Advanced Encryption Standard (AES). NIST SP800-38A NIST Special Publication 800-38A (2001), Recommendation for Block Cipher Modes of Operation Methods and Techniques. NIST SP800-38B NIST Special Publication 800-38B (2005), Recommendation for Block Cipher Modes of Operati
48、on: The CMAC Mode for Authentication. 3 Definitions See clause 3 of ITU-T G.987. 4 Abbreviations and acronyms See clause 4 of ITU-T G.987. 5 Conventions See clause 5 of ITU-T G.987. 6 XG-PON transmission convergence layer overview 6.1 XGTC layer structure The XGTC layer is a part of the XG-PON proto
49、col stack that specifies the formats and procedures of mapping between upper layer service data units (SDUs), on the one hand, and bitstreams suitable for modulating the optical carrier, on the other hand. Rec. ITU-T G.987.3 (01/2014) 3 The XGTC layer is composed of three sublayers: the XGTC service adaptation sublayer, the XGTC framing sublayer, and the XGTC PHY adaptation sublayer. The XGTC
