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1、INTERNATIONAL TELECOMMUNICATION UNIONSTUDY GROUP 15TELECOMMUNICATIONSTANDARDIZATION SECTORSTUDY PERIOD 2009-2012TD 128 (PLEN/15)English onlyOriginal: EnglishQuestion(s):2/15Geneva, 28 September - 09 October 2009 TEMPORARY DOCUMENTSource:Editors, G.xgpon987.1Title:Draft new Recommendation G.987.1 10
2、Gigabit-capable Passive Optical Network (XG-PON): General Requirements (for consent)This document contains version 0.6 of Draft New Recommendation G.987.1. Note that Living List for Draft G.987.1 is submitted as a companion document.VersionRevision pointsDateInitialThe first draft skeleton submitted
3、 in ITU Q.2/15 May 12, 20090.1Skeleton grooming & content proposal.May 29, 20090.2Initial draftJune 20, 20090.3Revisions updated based on 7/28 Audio conference commentsAug 02, 20090.4Version before KL meeting. Added Dozing mode in power saving section.Aug 27, 20090.5Input to the Kuala Lumpur interim
4、 meeting. September 2, 20090.6Updated based on Kuala Lumpur ITU-T meetingSept 17, 2009The revision marks indicate changes from draft 0.5.ITU-T Recommandation G.987.110 Gigabit-capable Passive Optical Network (XG-PON): General Requirements1 ScopeThis Recommendation addresses the general requirements
5、of 10 Gigabit-capable Passive Optical Network (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 (UNI) and Service Node Interfaces (SNI), as well as
6、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 Recommendation maintains characteristics
7、from ITU-T Rec. G.982, G.983, and G.984 series of Recommendations. This is to promote backward compatibility with existing Optical Distribution Networks (ODN) that complies with those Recommendations. Furthermore, this recommendation provides a mechanism that enables seamless subscriber migration fr
8、om Gigabit PON (Generic term to represent both G-PON and GE-PON) to XGPON using WDM defined in the G.984 series.There are two flavours of XG-PONs based on the upstream line rate: XG-PON1 featuring a 2.5Gbit/s upstream path and XG-PON2 featuring a 10Gbit/s one. The initial phase of this specification
9、 only addresses XG-PON1. XG-PON2 will be addressed at later phase when the technology becomes more mature.2 ReferencesThe following ITU-T Recommendations and other references contain provisions, which, through reference in this text, constitute provisions of this Recommendation. At the time of publi
10、cation, 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 Recommendations and other references listed below. A list of th
11、e 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 Recommendation1ITU-T Recommendation G.652 (2005), Characteristics of a single-mode optical fibre cable.2ITU-T Recommenda
12、tion G.902 (1995), Framework Recommendation on functional access networks (AN) Architecture and functions, access types, management and service node aspects.3ITU-T Recommendation G.982 (1996), Optical access networks to support services up to the ISDN primary rate or equivalent bit rates.4ITU-T Reco
13、mmendation G.983.1 (2005), Broadband optical access systems based on Passive Optical Networks (PON).5ITU-T Recommendation G.983.2 (2005), ONT management and control interface specification for B-PON.6ITU-T Recommendation G.983.3 (2001), A broadband optical access system with increased service capabi
14、lity by wavelength allocation.7ITU-T Recommendation G.984.1 (2008), Gigabit-capable Passive Optical Networks (GPON):General characteristics.8ITU-T Recommendation G.984.2 (2008), Gigabit-capable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specifications.9ITU-T Recommendation
15、 G.984.3 (2008), Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification.10ITU-T Recommendation G.984.4 (2008), Gigabit-capable Passive Optical Networks (GPON): ONT management and control interface specification.11ITU-T Recommendation G.984.5 (2007), Gigabit-cap
16、able Passive Optical Networks (GPON): Enhancement band for Gigabit-capable Passive Optical Networks.12ITU-T Recommendation I.112 (1993), Vocabulary of terms for ISDNs.13ITU-T Recommendation G.808.1 (2006), Generic protection switching Linear trail and subnetwork protection.14ITU-T Recommendation G.9
17、84.6 (2008), Gigabit-capable Passive Optical Networks (GPON): GPON optical reach extension (G.984.re).15ITU-T Recommendation Y.2201 (2007), NGN release 1 requirements16 ITU-T Recommendation G.810 (1996), Definitions and terminology for synchronization networks17 ITU-T Recommendation G.813 (2003), Ti
18、ming characteristics of SDH equipment slave clocks (SEC)18 ITU-T Recommendation G.703 (2008), Physical/electrical characteristics of hierarchical digital interfaces19 ITU-T Recommendation G.8261 (2008), Timing and synchronization aspects in packet networks 20 ITU-T Recommendation G.8262 (2008), Timi
19、ng characteristics of synchronous ethernet equipment slave clock (EEC)21 ITU-T Series G Supplement45 (2009), Means and impact of GPON power saving. White Paper22ITU-T Recommendation G.987 (20XX), G.xgpon definitions, abbreviations and acronyms23 ITU-T Recommendation G.987.2 (20XX),10-Gigabit-capable
20、 Passive Optical Networks (XG-PON): Physical Media Dependent (PMD) layer specification 24ITU-T Recommendation Y.2001 (12/2004), General overview of NGN.25ITU-T Recommendation J.186 (July/2003), Transmission equipment for multi-channel television signals over optical access networks by sub-carrier mu
21、ltiplexing (SCM).3 DefinitionsSee ITU-T Rec. G.987 22, clause 3.4 Abbreviations and AcronymsSee ITU-T Rec. G.987 22, clause 4.5 Architecture of the optical access network5.1 Network architectureThe optical section of a local access network system can be either active or passive and its architecture
22、can be either point-to-point or point-to-multipoint. Figure 1shows the considered architectures, which range from Fibre to the Home (FTTH), Fibre to the Cell sites (FTTCell), Fibre to the Building/Curb (FTTB/C), to the Fibre to the Cabinet (FTTCab), etc. The Optical Distribution Network (ODN) is com
23、mon to all architectures shown in Figure 1; hence the commonality of this system has the potential to generate large worldwide volumes.Figure 1 - Network ArchitectureThe differences among these FTTx options are mainly due to the different services supported and the different locations of the ONUs ra
24、ther than the ODN itself, so they can be treated as one in this Recommendation. It must be noted that a single OLT optical interface might accommodate a combination of several scenarios described hereafter. XG-PON should extend the G.984.6 reach extenders capability, inherited from the G.984 recomme
25、ndations series, to produce extra optical budget to achieve longer distances and/or additional passive split. 5.1.1 FTTB scenarioThe FTTB scenario is divided into two scenarios, one for multi-dwelling units (MDU) and the other for businesses or mixed environments (MTU). Each scenario has the followi
26、ng service categories:5.1.1.1 FTTB for MDU served residential usersAsymmetric broadband services (e.g., IPTV, digital broadcast services, VOD, file download, etc.).Symmetric broadband services (e.g., content broadcast, e-mail, file exchange, distance learning, telemedicine, online-game, etc.).POTS -
27、 The access network must be able to provide, in a flexible way, narrow-band telephone services with appropriate using either emulation (complete replication of a legacy service) or simulation (providing a service that is almost the same as the legacy service).5.1.1.2 FTTB for MTU served business use
28、rsSymmetric broadband services (e.g. group software, content broadcast, e-mail, file exchange, etc.).POTS - The access network must be able to provide, in a flexible way, narrow-band telephone services using either emulation (complete replication of a legacy service) or simulation (providing a servi
29、ce that is almost the same as the legacy service).Private line. The access network must be able to provide, in a flexible way, private line services at several rates.5.1.2 FTTC and FTTCab scenarioWithin this scenario, the following service categories have been considered:Asymmetric broadband service
30、s (e.g., IPTV, digital broadcast services, VoD, file download, online-game, etc.).Symmetric broadband services (e.g., content broadcast, e-mail, file exchange, distance learning, telemedicine, etc.).POTS - The access network must be able to provide, in a flexible way, narrow-band telephone services
31、using either emulation (complete replication of a legacy service) or simulation (providing a service that is almost the same as the legacy service).xDSL backhaul.5.1.3 FTTH scenarioWithin this scenario, the following service categories have been considered:Asymmetric broadband services (e.g., IPTV,
32、digital broadcast services, VOD, file download, etc.).Symmetric broadband services (e.g., content broadcast, e-mail, file exchange, distance learning, telemedicine, online-game, etc.).POTS - The access network must be able to provide, in a flexible way, narrow-band telephone services using either em
33、ulation (complete replication of a legacy service) or simulation (providing a service that is almost the same as the legacy service).5.1.4 FTTO scenarioFTTO addresses business ONU dedicated to a small business customer. Within this scenario, the following service categories have been considered: Sym
34、metric broadband services (e.g., group software, content broadcast, e-mail, file exchange, etc.).POTS - The access network must be able to provide, in a flexible way, narrow-band telephone services using either emulation (complete replication of a legacy service) or simulation (providing a service t
35、hat is almost the same as the legacy service).Private line. The access network must be able to provide, in a flexible way, private line services at several rates.5.1.5 FTTCell wireless scenarioWithin this scenario, the ONU will be called CBU and will have to offer connectivity to wireless base stati
36、ons:- Symmetric TDM services (e.g. 2G cell site backhaul)- Symmetric/Asymmetric packet based broadband services (e.g. 3G/4G cell site backhaul)- Hot spotsWithin this scenario, the ONU will be called CBU and will have to offer connectivity to wireless base stations:Figure 2 represents exemplary scena
37、rios of XG-PON applications.-Figure 2 - A summary of some XG-PON scenarios5.1.6 Environment conditions in outdoor scenariosFor supporting the wide range of scenarios and applications, optical parameters for the OLT and the ONU should be determined to allow an outdoor operation.5.2 Reference configur
38、ationA high level and simple reference configuration of XG-PON is depicted in Figure 3, which shows very similar high level reference configuration as G.983 and G.984 series. Figure 3 - High Level Reference Configuration of XG-PONFigure 4 - Reference access network architectureFigure 4 depicts gener
39、ic optical access network (OAN) reference architecture that applies to the XG-PON. It includes an OLT, ONUs and an Optical Distribution Network (ODN) between them. As shown in Figure 4, an XG-PON ODN can consist of a single PON or a group of PONs interconnected via Reach Extender 22. Further, refere
40、nce architecture of XG-PON system showing how XG-PON and G-PON can co-exist on the same ODN is detailed in Figure 5. Figure 5 - Reference Optical Configuration for XG-PON Functions of WDFs and WDMs that enables the G-PON and XG-PON co-existence as shown in Figure 5are listed follows:WBF Wavelength B
41、locking Filter for blocking the interference signals to Rx.WBF-V Wavelength Blocking Filter for blocking the interference signals to V-Rx.WDM-N WDM filter in GPON ONU to combine/isolate the wavelengths of GPON upstream and downstream.WDM-N WDM filter in GPON ONU to combine/isolate the wavelengths of
42、 GPON upstream and downstream and isolate the video signal(s).WDM-LWDM filter in GPON OLT to combine/isolate the wavelengths of GPON upstream and downstream.WDM1rWDM filter which is located in the central office to combine/isolate the wavelengths of GPON and XGPON/video signals.WDM2Optional WDM filt
43、er which may be located in the central office to combine/isolate the wavelengths of XGPON and video signals.5.2.1 User Network Interface (UNI) and Service Node Interface (SNI)As depicted in Figure 3, ONU provides UNI towards end users, while the OLT provides the SNI interface towards the core networ
44、k. The types of UNI/SNI interfaces depend on the services that the service provider offers. See ITU-T Rec. G.902 2. The examples of UNI are described in appendix I clause I.1.2. The examples of SNI are described in appendix I clauseI.1.35.2.2 Interface at the reference points S/R and R/SThe interfac
45、e at reference points S/R and R/S at OLT and ONU optical port is defined as IFXG-PON. This is a PON-specific interface that supports all the protocol elements necessary to allow transmission between OLT and ONUs.6 Migration scenarios Gigabit PONs such as GPON (ITUT G.984 series) and 1G-EPON (IEEE 80
46、2.3-2008) have been standardized and are now being deployed worldwide. With the ever increasing bandwidth demand from consumer and business applications, the most general requirement for a nextgeneration PON (NGPON) is to provide higher bandwidth than Gigabit PON. In addition, given the major invest
47、ments spent on time and money on deploying Gigabit PON mainly in the fibre infrastructure, NG-PON must be able to protect the investment of the legacy Gigabit PONs by ensuring a subscriber seamless and smooth migration capability from Gigabit PON to NGPON. Co-existence between XGPON and G-PON, which
48、 is addressed by this specification, is enabled through the wavelength band plan enhancements specified in Recommendation G.984.5, which also provides optional overlay capability of broadcast TV on a separate wavelength. Co-existence with other legacy PON systems is for further study and will not be covered in this version of the specification.There are several migration scenarios to meet
