1、 International Telecommunication Union ITU-T G.987.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2010) 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): Physical media dependent (PMD) layer specification Recommendation ITU-T G.987.2 Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IH
3、S-,-,-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 ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TEL
4、EPHONE 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 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHAR
5、ACTERISTICS 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 systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.
6、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 section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine
7、 cable systems G.970G.979 Optical 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.79
8、99 PACKET OVER TRANSPORT ASPECTS 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 netw
9、orking permitted without license from IHS-,-,-Rec. ITU-T G.987.2 (10/2010) i Recommendation ITU-T G.987.2 10-Gigabit-capable passive optical networks (XG-PON): Physical media dependent (PMD) layer specification Summary Recommendation ITU-T G.987.2 describes the physical layer requirements and specif
10、ications for the XG-PON physical media dependent (PMD) layer. Wavelength enhancement bands are described in Recommendation ITU-T G.987.1. The transmission convergence (TC) layer is described in Recommendation ITU-T G.987.3. The ONU management and control interface (OMCI) specifications are described
11、 in Recommendation ITU-T G.988. This Recommendation describes a flexible optical fibre access network capable of supporting the bandwidth requirements of business and residential services. The ITU-T G.987 series of standards allows for multiple upstream and downstream line rates. This Recommendation
12、 currently defines one type of 10-Gigabit-capable passive optical network (XG-PON) system with asymmetric nominal line rate of 9.95328 Gbit/s in the downstream direction and 2.48832 Gbit/s in the upstream direction, hereinafter referred to as XG-PON1. This Recommendation describes a system that repr
13、esents an evolutionary development from the systems described in the ITU-T G.984 series. To the greatest extent possible, this Recommendation maintains the requirements of Recommendation ITU-T G.984.1 to ensure maximal continuity with existing systems and optical fibre infrastructure. History Editio
14、n Recommendation Approval Study Group 1.0 ITU-T G.987.2 2010-01-13 15 2.0 ITU-T G.987.2 2010-10-07 15 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-,-,
15、-ii Rec. ITU-T G.987.2 (10/2010) 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 permanent organ of I
16、TU. 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, establishes the topics
17、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 standards are prepare
18、d 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 Recommendation may c
19、ontain 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 are used to expr
20、ess requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Prop
21、erty 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 received notice of
22、 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/. ITU 2011 A
23、ll rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or networking per
24、mitted without license from IHS-,-,-Rec. ITU-T G.987.2 (10/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 2 5 Conventions 2 6 Architecture of the optical access network . 2 6.1 Classes for optical path loss . 3 6.2 Categories for fibre differential dis
25、tance 3 7 Services . 3 8 User network interface and service node interface . 3 9 Optical network requirements. 4 9.1 Layered structure of optical network 4 9.2 Physical media dependent layer requirements for the XG-PON 4 10 X/S tolerance of XG-PON ONU 16 10.1 Versatile WDM configuration 17 11 Upstre
26、am physical layer overhead 17 Appendix I Examples of wavelength allocation for XG-PON, G-PON and video distribution services 18 Appendix II Physical layer measurements required to support optical layer supervision 19 Appendix III Allocation of the physical layer overhead time . 20 Appendix IV Jitter
27、 budget specifications 23 IV.1 The concept of jitter budget 23 IV.2 Definition of test points 24 IV.3 Jitter budget specification for XG-PON1 . 25 IV.4 Jitter measurements for compliance to budget . 26 Appendix V Measurement of burst mode acquisition time and burst mode eye opening at OLT . 27 Bibli
28、ography. 30 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-,-,-Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by I
29、HS under license with ITU-TNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Rec. ITU-T G.987.2 (10/2010) 1 Recommendation ITU-T G.987.2 10-Gigabit-capable passive optical networks (XG-PON): Physical media dependent (PMD) layer specification 1 Scope This Recommendati
30、on pertains to flexible access networks using optical fibre technology. The focus is primarily on a network supporting services with bandwidth requirements ranging from that of voice to data services running at up to 10 Gbit/s. Also included are broadcast services. This Recommendation describes char
31、acteristics of the PMD layer of an optical access network (OAN) with the capability of transporting various services between the user-network interface and the service node interface. The OAN dealt within this Recommendation enables the network operator to provide a flexible upgrade to meet future c
32、ustomer requirements, in particular, in the area of the optical distribution network (ODN). The ODN considered is based on a point-to-multipoint tree and branch option. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, con
33、stitute 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 the
34、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 (2
35、009), Characteristics of a single-mode optical fibre and cable. ITU-T G.657 Recommendation ITU-T G.657 (2009), Characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network. ITU-T G.783 Recommendation ITU-T G.783 (2006), Characteristics of synchronous digit
36、al hierarchy (SDH) equipment functional blocks; and its amendments. ITU-T G.825 Recommendation ITU-T G.825 (2000), The control of jitter and wander within digital networks which are based on the synchronous digital hierarchy (SDH); and its amendments. ITU-T G.957 Recommendation ITU-T G.957 (2006), O
37、ptical interfaces for equipments and systems relating to the synchronous digital hierarchy. ITU-T G.959.1 Recommendation ITU-T G.959.1 (2009), Optical transport network physical layer interfaces. ITU-T G.982 Recommendation ITU-T G.982 (1996), Optical access networks to support services up to the ISD
38、N primary rate or equivalent bit rates. ITU-T G.984.1 Recommendation ITU-T G.984.1 (2008), Gigabit-capable passive optical networks (GPON): General characteristics; and its amendments. ITU-T G.984.2 Recommendation ITU-T G.984.2 (2003), Gigabit-capable Passive Optical Networks (GPON): Physical Media
39、Dependent (PMD) layer specification; and its amendments. 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.987.2 (10/2010) ITU-T G.987 R
40、ecommendation ITU-T G.987 (2010), 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), 10-Gigabit-capable passive optical networks (XG-PON): General requirements. ITU-T G.987.3 Recommendation ITU-T G.
41、987.3 (2010), 10-Gigabit-capable passive optical networks (XG-PON): Transmission convergence (TC) specifications. ITU-T G.988 Recommendation ITU-T G.988 (2010), ONU management and control interface (OMCI) specification. ITU-T G-Sup.39 ITU-T G-series Recommendations Supplement 39 (2008), Optical syst
42、em design and engineering considerations. ITU-T L.66 Recommendation ITU-T L.66 (2007), Optical fibre cable maintenance criteria for in-service fibre testing in access networks. 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 clau
43、se 5 of ITU-T G.987. 6 Architecture of the optical access network See ITU-T G.984.1. For convenience, Figure 1 of ITU-T G.984.2 is reproduced below. OLTR/S S/ROrd ru, OODNR/SONUnONU1Old lu, OReference pointsOptical interfacesRepresents one or more fibresRepresents optional protection fibresOrd ru, O
44、O, Ord ru ld lu, O , OR and SFigure 6-1 Generic physical configuration of the optical distribution network (reproduced from Figure 1 of ITU-T G.984.2) Copyright International Telecommunication Union/ITU Telcommunication Sector Provided by IHS under license with ITU-TNot for ResaleNo reproduction or
45、networking permitted without license from IHS-,-,-Rec. ITU-T G.987.2 (10/2010) 3 The following reference points are defined in Figure 6-1: S: Point on the optical fibre just after the OLTDownstream/ONUUpstream optical connection point (i.e., optical connector or optical splice). R: Point on the opti
46、cal fibre just before the ONUDownstream/OLTUpstream optical connection point (i.e., optical connector or optical splice). S/R, R/S: Combination of points S and R existing simultaneously in a single fibre, when operating in bidirectional mode. Oru, Ord: Optical interface at the reference point R/S be
47、tween the ONU and the ODN for the upstream and downstream directions respectively. Olu, Old: Optical interfaces at the reference point S/R between the OLT and the ODN for the upstream and downstream directions respectively. The two directions for optical transmission in the ODN are identified as fol
48、lows: downstream direction for signals travelling from the OLT to the ONU(s), and upstream direction for signals travelling from the ONU(s) to the OLT. Transmission in downstream and upstream directions takes place on the same fibre and components (duplex/diplex configuration). 6.1 Classes for optical path loss Recommended classes for optical path loss are shown in Table 6-1. Table 6-1 Classes for optical path loss defined in this Recommendation Nominal1 class (N1 class) Nominal2 class(N2 class) Extended1 class (E1 class) Extended2 cla
