Draft new Recommendation G9871 10 Gigabit-capable Passive

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Draft new Recommendation G9871 10 Gigabit-capable Passive


ITU-T G.987.1


    OF ITU


    Digital sections and digital line system Optical line

    systems for local and access networks

     10 Gigabit-capable Passive Optical Network (XG-PON): General Requirements



    This prepublication is an unedited version of a recently approved Recommendation.

    It will be replaced by the published version after editing. Therefore, there will be

    differences between this prepublication and the published version.


    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 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, 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 laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-T's purview, the necessary standards are prepared on a collaborative basis with ISO and IEC.


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    As of the date of approval of this Recommendation, ITU [had/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 represent the latest information and are therefore strongly urged to consult the TSB patent database at

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Recommendation ITU-T G.987.1

    10 Gigabit-capable Passive Optical Network (XG-PON):

    General Requirements

    1 Scope

    This Recommendation 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 transmission convergence layer specifications. The general requirements include examples of services, User Network Interfaces (UNI) and Service Node Interfaces (SNI), 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 Recommendation maintains characteristics from [ITU-T G.982], [ITU-T G.983], and [ITU-T 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 from 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 only addresses XG-PON1. XG-PON2 will be addressed at 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, 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 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 does not give it, as a stand-alone document, the status of a Recommendation [ITU-T G.652] ITU-T Recommendation G.652 (2005), Characteristics of a single-mode

    optical fibre cable.

    [ITU-T G.657] ITU-T Recommendation G.657 (2006), Characteristics of a bending loss

    insensitive single mode optical fibre and cable for the access network. [ITU-T G.902] ITU-T Recommendation G.902 (1995), Framework Recommendation on

    functional access networks (AN) Architecture and functions, access types,

    management and service node aspects.

     [ITU-T G.982] ITU-T Recommendation G.982 (1996), Optical access networks to support

    services up to the ISDN primary rate or equivalent bit rates.

    [ITU-T G.983.1] ITU-T Recommendation G.983.1 (2005), Broadband optical access systems

    based on Passive Optical Networks (PON).

    Rec. ITU-T G.987.1 (01/2010) Prepublished version 1

[ITU-T G.983.2] ITU-T Recommendation G.983.2 (2005), ONT management and control

    interface specification for B-PON.

    [ITU-T G.983.3] ITU-T Recommendation G.983.3 (2001), A broadband optical access system

    with increased service capability by wavelength allocation.

    [ITU-T G.984.1] ITU-T Recommendation G.984.1 (2008), Gigabit-capable Passive Optical

    Networks (GPON): General characteristics.

    [ITU-T G.984.2] ITU-T Recommendation G.984.2 (2008), Gigabit-capable Passive Optical

    Networks (GPON): Physical Media Dependent (PMD) layer specifications. [ITU-T G.984.3] ITU-T Recommendation G.984.3 (2008), Gigabit-capable Passive Optical

    Networks (GPON): Transmission convergence layer specification.

    [ITU-T G.984.4] ITU-T Recommendation G.984.4 (2008), Gigabit-capable Passive Optical

    Networks (GPON): ONT management and control interface specification. [ITU-T G.984.5] ITU-T Recommendation G.984.5 (2007), Gigabit-capable Passive Optical

    Networks (GPON): Enhancement band for Gigabit-capable Passive Optical


    [ITU-T G.984.5Am1] ITU-T Recommendation G.984.5 Am1 (2009), Gigabit-capable Passive

    Optical Networks (G-PON): Enhancement band. Amendment 1.

     [ITU-T G.808.1] ITU-T Recommendation G.808.1 (2006), Generic protection switching

    Linear trail and subnetwork protection.

    [ITU-T G.984.6] ITU-T Recommendation G.984.6 (2008), Gigabit-capable Passive Optical

    Networks (GPON): GPON optical reach extension (

    [ITU-T Y.2201] ITU-T Recommendation Y.2201 (2007), NGN release 1 requirements [ITU-T G.810] ITU-T Recommendation G.810 (1996), Definitions and terminology for

    synchronization networks

    [ITU-T G.813] ITU-T Recommendation G.813 (2003), Timing characteristics of SDH

    equipment slave clocks (SEC)

    [ITU-T G.703] ITU-T Recommendation G.703 (2008), Physical/electrical characteristics of

    hierarchical digital interfaces

    [ITU-T G.8261] ITU-T Recommendation G.8261 (2008), Timing and synchronization aspects

    in packet networks

    [ITU-T G.8262] ITU-T Recommendation G.8262 (2008), Timing characteristics of synchronous

    Ethernet equipment slave clock (EEC)

    [ITU-T G.Sup45] ITU-T Series G Supplement45 (2009), Means and impact of GPON power

    saving. White Paper

    [ITU-T G.987] ITU-T Recommendation G.987 (2009), G.987 definitions, abbreviations and


    [ITU-T G.987.2] ITU-T Recommendation G.987.2 (2009), 10-Gigabit-capable Passive Optical

    Networks (XG-PON): Physical Media Dependent (PMD) layer specification [ITU-T Y.2001] ITU-T Recommendation Y.2001 (12/2004), General overview of NGN. [ITU-T Y.1731] ITU-T Recommendation Y.1731 (02/2008), OAM functions and mechanisms

    for Ethernet based networks.

    Rec. ITU-T G.987.1 (01/2010) Prepublished version 2

    [ITU-T J.185] ITU-T Recommendation J.185 (02/2002), Transmission equipment for

    transferring multi-channel television signals over optical access networks by

    FM conversion.

    [ITU-T J.186] ITU-T Recommendation J.186 (06/2003), Transmission equipment for multi-

    hannel television signals over optical access networks by sub-carrier c

    multiplexing (SCM).

    [IEEE 1588] IEEE 1588-2008 (2008), IEEE Standard for a Precision Clock Synchronization

    Protocol for Networked Measurement and Control Systems

    [DSLF TR-156] DSL Forum (also known as the Broadband Forum) TR-156 (2008) Using

    GPON Access in the context of TR-101

    [MEF 10.1] MEF 10.1 (2006), Ethernet Service Attributes Phase 2

    3 Definitions

    See [ITU-T G.987], clause 3.

    4 Abbreviations and Acronyms

    See [ITU-T G.987], clause 4.

    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 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 common to all architectures shown in Figure 5-1; hence the commonality of this system has the potential to generate large worldwide volumes.

Rec. ITU-T G.987.1 (01/2010)