1、 International Telecommunication Union ITU-T G.987.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2010) 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): General requirements Recommendation ITU-T G.987.1 Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ITU-T G-SERIES RECOMMEND
3、ATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS 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 LIN
4、ES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR 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
5、 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 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
6、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 section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Opti
7、cal line systems for local and access networks G.980G.989Access networks G.990G.999 MULTIMEDIA 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 ASPEC
8、TS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without licen
9、se from IHS-,-,-Rec. ITU-T G.987.1 (01/2010) i Recommendation ITU-T G.987.1 10-Gigabit-capable passive optical networks (XG-PON): General requirements Summary Recommendation ITU-T G.987.1 addresses the general requirements of 10 Gigabit-capable passive optical network (XG-PON) systems, in order to g
10、uide and motivate the physical layer and the transmission convergence layer specifications. The general requirements include examples of services, user network interfaces (UNIs) and service node interfaces (SNIs), as well as the principal deployment configurations that are requested by network opera
11、tors. This Recommendation also includes the system and operational requirements to meet the needs of supporting various business and residential applications. History Edition Recommendation Approval Study Group 1.0 ITU-T G.987.1 2010-01-13 15 Copyright International Telecommunication Union/ITU Telco
12、mmunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii Rec. ITU-T G.987.1 (01/2010) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunic
13、ations, 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 telecommunicat
14、ions 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 the procedure
15、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 a telecommun
16、ication 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 all of these ma
17、ndatory 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 RIGHTS ITU draw
18、s 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 ITU members or
19、 others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not repr
20、esent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2010 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Copyright International
21、 Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Rec. ITU-T G.987.1 (01/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 T
22、erms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 Architecture of the optical access network . 3 5.1 Network architecture 3 5.2 Reference configuration . 6 6 Migration scenarios 12 6.1 Migration from legacy PON to XG-PON . 13 6.2 Migration from XG-PON1 to XG-PON2 . 14 6.3 Over
23、lay of XG-PON or hybrid XG-PON . 14 6.4 RE architecture options 14 7 Service requirements 15 7.1 Services . 15 7.2 Maximum/mean signal transfer delay tolerance . 16 7.3 Maximum Ethernet packet size 16 7.4 Synchronization features and quality . 16 7.5 Leased line T1/E1 emulation 17 7.6 QoS and traffi
24、c management 17 8 Physical layer requirements 18 8.1 Fibre characteristics 18 8.2 Optical wavelengths of XG-PON . 18 8.3 Bit rates . 18 8.4 Optical power budget . 18 8.5 Split ratio 19 8.6 Fibre distance 20 9 System level requirements 20 9.1 Power saving and energy efficiency . 20 9.2 Authentication
25、/identification/encryption 21 9.3 Dynamic bandwidth assignment (DBA) 21 9.4 Eye safety . 22 10 Operational requirements 22 10.1 ONU management 22 10.2 PON supervision . 22 11 Resilience and protection on ODN . 23 Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by
26、 IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iv Rec. ITU-T G.987.1 (01/2010) Page Appendix I Examples of practical XG-PON system architecture . 24 I.1 Services, UNIs and SNIs 24 I.2 Typical system architectures 25 I.3 Service protoco
27、l stacks . 27 Appendix II Synchronizing requirements for wireless in CBU scenario 38 Appendix III External access network back-up 39 III.1 External access network back-up . 39 Bibliography. 42 Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license w
28、ith ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Rec. ITU-T G.987.1 (01/2010) 1 Recommendation ITU-T G.987.1 10-Gigabit-capable passive optical networks (XG-PON): General requirements 1 Scope This Recommendation addresses the general requirements of 10-Giga
29、bit-capable passive optical networks (XG-PON) systems, in order to guide and motivate the physical layer and the transmission convergence layer specifications. The general requirements include examples of services, user network interfaces (UNIs) and service node interfaces (SNIs), as well as the pri
30、ncipal deployment configurations that are requested by network operators. This Recommendation also includes the system and operational requirements to meet the needs of supporting various business and residential applications. As much as possible, this Recommendation maintains characteristics from I
31、TU-T G.982, and the ITU-T G.983.x, and ITU-T G.984.x series of Recommendations. This is to promote backward compatibility with existing optical distribution networks (ODN) that comply with those Recommendations. Furthermore, this Recommendation provides a mechanism that enables seamless subscriber m
32、igration from Gigabit PON (Generic term to represent both G-PON and GE-PON) to XG-PON using the wavelength division multiplexing (WDM) defined in ITU-T G.984.x series. There are two flavours of XG-PONs based on the upstream line rate: XG-PON1, featuring a 2.5 Gbit/s upstream path, and XG-PON2, featu
33、ring a 10 Gbit/s one. The initial phase of this Recommendation only addresses XG-PON1. XG-PON2 will be addressed at a later phase, when the technology becomes more mature. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text,
34、constitute provisions of this Recommendation. At the time of publication, the editions indicated were 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 t
35、he 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-T G.652 Recommendation ITU-T G.652
36、 (2005), Characteristics of a single-mode optical fibre and cable. ITU-T G.657 Recommendation ITU-T G.657 (2006), Characteristics of a bending loss insensitive single mode optical fibre and cable for the access network. ITU-T G.703 Recommendation ITU-T G.703 (2001), Physical/electrical characteristi
37、cs of hierarchical digital interfaces. ITU-T G.808.1 Recommendation ITU-T G.808.1 (2006), Generic protection switching Linear trail and subnetwork protection. ITU-T G.810 Recommendation ITU-T G.810 (1996), Definitions and terminology for synchronization networks. ITU-T G.813 Recommendation ITU-T G.8
38、13 (2003), Timing characteristics of SDH equipment slave clocks (SEC). Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 Rec. ITU-T G.987.1 (01/2010)
39、 ITU-T G.902 Recommendation ITU-T G.902 (1995), Framework Recommendation on functional access networks (AN) Architecture and functions, access types, management and service node aspects. ITU-T G.982 Recommendation ITU-T G.982 (1996), Optical access networks to support services up to the ISDN primary
40、 rate or equivalent bit rates. ITU-T G.983.1 Recommendation ITU-T G.983.1 (2005), Broadband optical access systems based on Passive Optical Networks (PON). ITU-T G.983.2 Recommendation ITU-T G.983.2 (2005), ONT management and control interface specification for B-PON. ITU-T G.983.3 Recommendation IT
41、U-T G.983.3 (2001), A broadband optical access system with increased service capability by wavelength allocation. ITU-T G.984.1 Recommendation ITU-T G.984.1 (2008), Gigabit-capable passive optical networks (GPON): General characteristics. ITU-T G.984.2 Recommendation ITU-T G.984.2 (2003), Gigabit-ca
42、pable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specification. ITU-T G.984.3 Recommendation ITU-T G.984.3 (2008), Gigabit-capable Passive Optical Networks (G-PON): Transmission convergence layer specification. ITU-T G.984.4 Recommendation ITU-T G.984.4 (2008), Gigabit-cap
43、able passive optical networks (G-PON): ONT management and control interface specification. ITU-T G.984.5 Recommendation ITU-T G.984.5 (2007), Gigabit-capable Passive Optical Networks (G-PON): Enhancement band. ITU-T G.984.5 Amd.1 Recommendation ITU-T G.984.5 Amd.1 (2009), Gigabit-capable Passive Opt
44、ical Networks (G-PON): Enhancement band, plus Amendment 1. ITU-T G.984.6 Recommendation ITU-T G.984.6 (2008), Gigabit-capable passive optical networks (GPON): Reach extension. ITU-T G.987 Recommendation ITU-T G.987 (2010), 10-Gigabit-capable passive optical network (XG-PON) systems: Definitions, abb
45、reviations, and acronyms. 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.8261 Recommendation ITU-T G.8261/Y.1361 (2008), Timing and synchronization aspects in packet networks. ITU-T
46、G.8262 Recommendation ITU-T G.8262/Y.1362 (2007), Timing characteristics of synchronous Ethernet equipment slave clock (EEC). ITU-T J.185 Recommendation ITU-T J.185 (2002), Transmission equipment for transferring multi-channel television signals over optical access networks by FM conversion. ITU-T J
47、.186 Recommendation ITU-T J.186 (2002), Transmission equipment for multi-channel television signals over optical access networks by sub-carrier multiplexing (SCM). Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo rep
48、roduction or networking permitted without license from IHS-,-,-Rec. ITU-T G.987.1 (01/2010) 3 ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. ITU-T Y.2201 Recommendation ITU-T Y.2201 (2007), NGN release 1 requirements. DSLF TR-156 Broadband Forum TR-156 (2008), Using GPON Access in the context of TR-101. IEC 60825-2 IEC 60825-2 (2007), Safety of laser products Part 2: Safety of optical fibre communication systems (OFCS). IEEE 1588 IEEE 1588-2008, IEEE Standard for a Precision Clock Synchronization
