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.987.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access net
2、works 10-Gigabit-capable passive optical networks (XG-PON): General requirements Recommendation ITU-T G.987.1 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
3、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 METALLIC LINES G.400G.449
4、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 for optical fibre cable
5、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 systems G.950G.959 Digital
6、 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 GENERIC AND USER-RELATED A
7、SPECTS 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.987.1 (03/2016) i Recommen
8、dation 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 guide and motivate the physical layer and the transmissi
9、on 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 operators. This Recommendation also includes the system and
10、operational requirements to meet the needs of supporting various business and residential applications. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.987.1 2010-01-13 15 11.1002/1000/10410 1.1 ITU-T G.987.1 (2010) Amd. 1 2012-04-22 15 11.1002/1000/11498 2.0 ITU-T G.987.1
11、 2016-03-29 15 11.1002/1000/12794 Keywords Asymmetric XG-PON (X=10 Gbit/s), general requirements, TDMA. _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/
12、1000/11830-en. ii Rec. ITU-T G.987.1 (03/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a perman
13、ent 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 Telecommunication Standardization Assembly (WTSA), which meets every four years, establish
14、es 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 areas of information technology which fall within ITU-Ts purview, the necessary standar
15、ds 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 operating agency. Compliance with this Recommendation is voluntary. However, the Recomm
16、endation 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 “shall“ or some other obligatory language such as “must“ and the negative equivalents ar
17、e 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 practice or implementation of this Recommendation may involve the use of a claimed Inte
18、llectual 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 development process. As of the date of approval of this Recommendation, ITU had not recei
19、ved 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 therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr
20、/. 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.987.1 (03/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined i
21、n 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 Overlay of XG-PON
22、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 . 17 7.5 Leased line T1/E1 emulation 17 7.6 QoS and traffic management 1
23、7 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 . 19 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/identificatio
24、n/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 iv Rec. ITU-T G.987.1 (03/2016) Page Appendix I Examples of practical XG-PON system architecture . 24
25、 I.1 Services, UNIs and SNIs 24 I.2 Typical system architectures 25 I.3 Service protocol stacks . 27 Appendix II Synchronizing requirements for wireless in CBU scenario 38 Appendix III External access network back-up 39 Appendix IV Operation with IEEE 1588: Principles 42 Appendix V Operation with IE
26、EE 1588: Use cases for frequency and time of day synchronization . 43 Appendix VI Operation with IEEE 1588 48 Bibliography. 49 Rec. ITU-T G.987.1 (03/2016) 1 Recommendation ITU-T G.987.1 10-Gigabit-capable passive optical networks (XG-PON): General requirements 1 Scope This Recommendation addresses
27、the general requirements of 10-Gigabit-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 in
28、terfaces (SNIs), as well as the principal 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 Recommendati
29、on maintains characteristics from ITU-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 (ODNs) that comply with those Recommendations. Furthermore, this Recommendation provides a mechanis
30、m that enables seamless subscriber migration from Gigabit PON (generic term to represent both G-PON and GE-PON) to XG-PON using the wavelength division multiplexing (WDM) defined in the ITU-T G.984.x series of Recommendations. There are two types of XG-PONs based on the upstream line rate: XG-PON1,
31、featuring a 2.5 Gbit/s upstream path, and XG-PON2, featuring a 10 Gbit/s one, XG-PON2 being symmetrical it can be referred to as XGS-PON. 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
32、 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 and other references are subject to revision; users of
33、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
34、 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.657 Recommendation ITU-T G.657 (2012), Characteristics of a bending-loss insensitive single-mode optical fibr
35、e and cable for the access network. ITU-T G.703 Recommendation ITU-T G.703 (2016), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T G.808.1 Recommendation ITU-T G.808.1 (2014), Generic protection switching Linear trail and subnetwork protection. ITU-T G.810 Recommendatio
36、n ITU-T G.810 (1996), Definitions and terminology for synchronization networks. ITU-T G.813 Recommendation ITU-T G.813 (2003), Timing characteristics of SDH equipment slave clocks (SEC). 2 Rec. ITU-T G.987.1 (03/2016) ITU-T G.902 Recommendation ITU-T G.902 (1995), Framework Recommendation on functio
37、nal 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 rate or equivalent bit rates. ITU-T G.983.1 Recommendation ITU-T G.983.1 (2005), B
38、roadband 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 ITU-T G.983.3 (2001), A broadband optical access system with increased service capabi
39、lity 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-capable Passive Optical Networks (G-PON): Physical Media Dependent (PMD) layer specif
40、ication. ITU-T G.984.3 Recommendation ITU-T G.984.3 (2014), Gigabit-capable Passive Optical Networks (G-PON): Transmission convergence layer specification. ITU-T G.984.4 Recommendation ITU-T G.984.4 (2008), Gigabit-capable passive optical networks (G-PON): ONT management and control interface specif
41、ication. 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 Optical Networks (G-PON): Enhancement band, plus Amendment 1. ITU-T G.984.6 Recommend
42、ation ITU-T G.984.6 (2008), Gigabit-capable passive optical networks (GPON): Reach extension. 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.987.2 Recommendation ITU-T G.987.2 (2016), 10-Gi
43、gabit-capable passive optical networks (XG-PON): Physical media dependent (PMD) layer specification. ITU-T G.987.3 Recommendation ITU-T G.987.3 (2014), 10-Gigabit-capable passive optical networks (XG-PON): Transmission Convergence (TC) layer specification. ITU-T G.988 Recommendation ITU-T G.988 (201
44、2), ONU management and control interface (OMCI) specification. ITU-T G.8261 Recommendation ITU-T G.8261/Y.1361 (2013), Timing and synchronization aspects in packet networks. ITU-T G.8262 Recommendation ITU-T G.8262/Y.1362 (2015), Timing characteristics of synchronous Ethernet equipment slave clock.
45、Rec. ITU-T G.987.1 (03/2016) 3 ITU-T J.185 Recommendation ITU-T J.185 (2012), Transmission equipment for transferring multi-channel television signals over optical access networks by frequency modulation conversion. ITU-T J.186 Recommendation ITU-T J.186 (2008), Transmission equipment for multi-chan
46、nel television signals over optical access networks by sub-carrier multiplexing (SCM). ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. ITU-T Y.2201 Recommendation ITU-T Y.2201 (2009), Requirements and capabilities for ITU-T NGN. DSLF TR-156 Broadband Forum TR-156 (2008), Us
47、ing 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 Protocol for Networked Measurement and Control Systems. MEF 1
48、0.1 MEF 10.1 (2006), Ethernet Service Attributes Phase 2. 3 Definitions 3.1 Terms defined elsewhere See clause 3 of ITU-T G.987. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms See clause 4 of ITU-T G.987. In addition, this Recommendation uses the following abbreviations:
49、 FTTO Fibre To The Office MTU Multi-Tenant Unit XGS-PON 10Gbit/s Symmetrical Passive Optical Network XTC XG-PON Transmission Convergence 5 Architecture of the optical access network 5.1 Network architecture The optical section of a local access network system can be either active or passive and its architecture can be either point-to-point or point-to-multipoint. Figure 5-1 shows the considered architectures, which can be fib
