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ITU-T G.984.4



    OF ITU



    Digital sections and digital line system Optical line systems for local and access networks

     Gigabit-capable Passive Optical Networks

    (G-PON): ONT management and control

    interface specification


    PREPUBLISHED RECOMMENDATION 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.


    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 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 are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party.


    ITU draws 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 others outside of the Recommendation development process.

    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

    ? ITU 2008

    All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU.

    ITU-T Recommendation G.984.4

    Gigabit-capable Passive Optical Networks (G-PON):

    ONT management and control interface specification

    5 Summary

    This Recommendation provides the Optical Network Termination (ONT) management and control interface (OMCI) specification for Gigabit-capable Passive Optical Network (G-PON) systems as defined in ITU-T Recs G.984.2 and G.984.3.

    Firstly, it specifies the managed entities of a protocol-independent management information base

    10 (MIB) that models the exchange of information between the Optical Line Termination (OLT) and the Optical Network Termination (ONT). In addition, it covers the ONT management and control channel, protocol and detailed messages. This revised version of G.984.4 incorporates the material from G.984.4 Amendment 1 and G.984.4 Amendment 2 and G.984.4 Amendment 3.

    In addition to the purely editorial collection work, this revision endeavors to remove all references

    15 to the optional ATM transport capabilities of G-PON, since all modern systems do not support it. 1 Scope

    This Recommendation specifies the ONT Management and Control Interface (OMCI) for the G-PON system defined in ITU-T Recs G.984.2 and G.984.3 to enable multi-vendor interoperability between the OLT and the ONT.

    20 The OMCI specification addresses the ONT configuration management, fault management and performance management for G-PON system operation and for several services including: ATM adaptation layer 5;

     GEM adaptation layers;

     Circuit emulation service;

    25 Ethernet services, including MAC bridged LAN;

     Voice services;

     Wavelength division multiplexing.

    The focus of this OMCI specification is on FTTH and FTTBusiness ONTs; however, support for ONUs is addressed as well. This Recommendation defines a protocol necessary to support the

    30 capabilities identified for these ONTs. It also allows optional components and future extensions. 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; 35 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.


    1 References to Implementors' Guides in the text of this Recommendation do not give them the status of


    ITU-T Rec. G.984.4 (02/2008) 1

    [1] ITU-T Recommendation G.711 (1988) Pulse code modulation (PCM) of voice frequencies.

    [2] ITU-T Recommendation G.722.1 (1999) Coding at 24 and 32 kbit/s for hands-free

    operation in systems with low frame loss.

    [3] ITU-T Recommendation G.722.2 (2003), Wideband coding of speech at around 16 kbit/s 5 using adaptive multi-rate wideband (AMR-WB).

    [4] ITU-T Recommendation I.363.5 (1996), B-ISDN ATM adaptation layer specification: Type

    5 AAL.

    [5] ITU-T Recommendation G.723.1 (2006), Dual rate speech coder for multimedia

    communications transmitting at 5.3 and 6.3 kbit/s. 10 [6] ITU-T Recommendation G.726 (1990), 40, 32, 24, 16 kbit/s adaptive differential pulse

    code nodulation (ADPCM).

    [7] ITU-T Recommendation G.729 (2007), Reduced complexity 8 kbit/s CS-ACELP speech


    [8] ITU-T Recommendation G.983.2 (2005), ONT management and control interface 15 specification for B-PON.

    [9] ITU-T Recommendation G.728 (1992), Coding of speech at 16 kbit/s using low-delay code

    excited linear prediction.

    [10] ITU-T Recommendation G.784 (1999), Synchronous digital hierarchy (SDH) management.

    [11] ITU-T Recommendation H.248 series (various), Gateway control protocol.

    20 [12] ITU-T Recommendation H.341 (1999), Multimedia management information base.

    [13] ITU-T Recommendation G.984.2 (2003), Gigabit-capable passive optical networks (G-

    PON): Physical media dependent (PMD) layer specification.

    [14] ITU-T Recommendation G.984.3 (2004), Gigabit-capable passive optical networks (G-

    PON): Transmission convergence layer specification, plus Amendment 1 (2005). 25 [15] ANSI T1.220 (2000), Information interchange Coded representation of the North

    American telecommunications industry manufacturers, suppliers, and related service


    [16] IEEE 802.1D, Media access control (MAC) bridges.

    [17] IEEE 802.11 MIB (1999), Information technology Telecommunications and information 30 exchange between systems Local and metropolitan area networks Specific requirements

     Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY)

    specifications, annex D.

    [18] IETF RFC 2096 (1997), IP forwarding table MIB.

    [19] SCTE 55-1 (2002), Digital broadband delivery system: Out of band transport part 1: mode

    35 A.

    [20] SCTE 55-2 (2002), Digital broadband delivery system: Out of band transport part 2: mode


    [21] ITU-T Recommendation G. 992.1 (1999), Asymmetric digital subscriber line (ADSL)


    40 [22] ITU-T Recommendation G. 992.3 (2005), Asymmetric digital subscriber line transceivers 2


    [23] ITU-T Recommendation G. 992.4 (2002), Splitterless asymmetric digital subscriber line

    transceivers 2 (splitterless ADSL2).

    ITU-T Rec. G.984.4 (02/2008) 2

    [24] ITU-T Recommendation G. 992.5 (2005), Asymmetric digital subscriber line (ADSL)

    transceivers Extended bandwidth ADSL2 (ADSL2).

    [25] ITU-T Recommendation G.993.1 (2004), Very high speed digital subscriber line


    5 [26] ITU-T Recommendation G.993.2 (2006), Very high speed digital subscriber line

    transceivers 2 (VDSL2).

    [27] ITU-T Recommendation G.994.1 (2003), Handshake procedures for digital subscriber line

    (DSL) transceivers.

    [28] ITU-T Recommendation G.997.1 (2006), Physical layer management for digital subscriber

    10 line (DSL) transceivers.

    [29] ITU-T Recommendation T.35 (2000), Procedure for the allocation of ITU-T defined codes

    for non-standard facilities.

    [30] ITU-T Recommendation T.38 (2005), Procedures for real-time group 3 facsimile

    communication over IP networks.

    15 [31] ETSI TS 101 270-1 (1999), Transmission and multiplexing (TM) Access transmission

    systems on metallic access cable Very high speed digital subscriber line (VDSL) part 1:

    Functional requirements.

    [32] ETSI TS 101 388 v.1.3.1 (2002), Transmission and multiplexing Access transmission

    systems on metallic access cables Asymmetric digital subscriber line (ADSL) 20 Coexistence of ADSL and ISDN-BA on the same pair.

    [33] ANSI T1.413 (1998), Network to customer installation interfaces Asymmetric digital

    subscriber line (ADSL) metallic interface.

    [34] DSLF TR-69 (2004), CPE WAN management protocol.

    [35] Metro Ethernet Forum MEF8 (2004), Implementation agreement for the emulation of PDH

    25 circuits over metro Ethernet networks.

    [36] IEEE 802.1Q (2005), Virtual bridged local area networks.

    [37] IETF RFC 815 (1982), IP datagram reassembly algorithms.

    [38] IETF RFC 1349 (1992), Type of service in the internet protocol suite.

    [39] IETF RFC 1483 (1993), Multiprotocol encapsulation over ATM adaptation layer 5. 30 [40] IETF RFC 2069 (1997), An extension to HTTP : Digest access authentication.

    [41] IETF RFC 2617 (1999), HTTP authentication: Basic and digest access authentication.

    [42] IETF RFC 2833 (2000), RTP payload for DTMF digits, telephony tones and telephony


    [43] IETF RFC 3551 (2003), RTP profile for audio and video conferences with minimal control. 35 [44] IETF RFC 4733 (2006), RTP payload for DTMF digits, telephony tones, and telephony


    [45] IETF RFC 4734 (2006), Definition of events for modem, fax, and text telephony signals.

    [46] ITU-T Recommendation M.3100 (2005), Generic network information model.

    [47] ITU-T Recommendation G.707 (2007), Network node interface for the synchronous digital

    40 hierarchy (SDH).

    ITU-T Rec. G.984.4 (02/2008) 3

    3 Definitions

    3.1 ONT and ONU

    3.1.1 Optical network termination (ONT): A single subscriber device that terminates any one of the

    distributed (leaf) endpoints of an ODN, implements a PON protocol, and adapts PON PDUs to 5 subscriber service interfaces. An ONT is a special case of an ONU.

    3.1.2 Optical network unit (ONU): A generic term denoting a device that terminates any one of the

    distributed (leaf) endpoints of an ODN, implements a PON protocol, and adapts PON PDUs to

    subscriber service interfaces. In some contexts, an ONU implies a multiple subscriber device.

    This recommendation uses the term ONT to refer to either configuration unless a distinction is

    10 necessary.

    3.2 Upstream and downstream

    The upstream is a traffic flow from ONT to OLT and the downstream is a traffic flow from OLT to


    4 Abbreviations

    15 This Recommendation uses the following abbreviations:

    AAL ATM Adaptation Layer

    ADSL Asymmetric Digital Subscriber Line (Note: the xDSL MEs include the G.992

    family as well as G.993.2 VDSL2, but not G.993.1 VDSL)

    AES Advanced Encryption Standard

    20 AIS Alarm Indication Signal

    AK Acknowledgement

    AN Access Node

    ANI Access Node Interface

    AP Access Point

    25 AR Acknowledge Request

    ARC Alarm Reporting Control

    ARP Address Resolution Protocol

    ASCII American Standard Code for Information Interchange

    ATM Asynchronous Transfer Mode

    30 ATU-C ADSL Transceiver Unit, central office end

    ATU-R ADSL Transceiver Unit, remote terminal end

    AVC Attribute Value Change

    BER Bit Error Rate

    BES Block Errored Second

    35 B-PON Broadband Passive Optical Network

    BSS Basic Service Set

    CAS Channel associated signalling

    CCA Clear Channel Assessment

    ITU-T Rec. G.984.4 (02/2008) 4

    CES Circuit Emulation Service

    CFI Canonical Format Indicator

    CFP Contention Free Period

    CID Customer/Caller Identification 5 CLEI Common Language Equipment Identification

    CLP Cell Loss Priority

    CNR Carrier-to-Noise Ratio

    CPCS-SDU Common Part Convergence Sublayer Service Data Unit

    CPCS-UU Common Part Convergence Sublayer User-to-User Indication

    10 CPI Common Part Indicator

    CPS Common Part Sublayer

    CRC Cyclic Redundancy Check

    CSS Controlled Slip Second

    CTB Composite Triple Beat 15 CTP Connection Termination Point

    CTS Clear To Send

    DB Destination Bit

    DBA Dynamic Bandwidth Assignment

    DCF Distributed Coordination Function 20 DEMUX De-multiplexing

    DHCP Dynamic Host Configuration Protocol

    DSL Digital Subscriber Line

    DSSS Direct-Sequence Spread Spectrum

    DTIM Delivery Traffic Indication Message 25 EMF Electromagnetic Field

    ES Errored Second

    ESS Extended Service Set

    FEC Forward Error Correction

    FHSS Frequency-Hopping Spread Spectrum 30 FTTB Fibre to the Building

    FTTBusiness Fibre to the Business

    FTTC Fibre to the Curb

    FTTCab Fibre to the Cabinet

    FTTH Fibre to the Home

    35 GAL GEM Adaptation Layer

    GEM G-PON Encapsulation Method

    G-PON Gigabit Passive Optical Network

    ITU-T Rec. G.984.4 (02/2008) 5

    GTC G-PON Transmission Convergence

    HEC Header Error Correction

    HN Home Network

    HOL Head of the Line 5 IBSS Independent Basic Service Set

    ICMP Internet Control Message Protocol

    ICV Integrity Check Value

    ID Identifier

    IF Interface

    10 IP Internet Protocol

    IR Infrared

    ISDN Integrated Services Digital Network

    IW Interworking

    LAN Local Area Network 15 LCT Local Craft Terminal

    LIM Line Interface Module

    LME Sublayer Management Entity

    LMI Layer Management Indication

    LMIG Layer Management Indication Generation 20 LMIR Layer Management Indication Receiving

    LOS Loss of Signal

    LSB Least Significant Bit

    LT Line Terminal

    MAC Media Access Control 25 MCM Multiple Carrier Modulation

    ME Managed Entity

    MIB Management Information Base

    MLT Mechanized Loop Testing

    MMPDU MAC Management Protocol Data Unit 30 MoCA Multimedia over Coax Alliance

    MPDU MAC Protocol Data Unit

    MSB Most Significant Bit

    MSDU MAC Service Data Unit

    MT Message Type

    35 MTU Maximum Transmission Unit

    MUX Multiplexing

    NMS Network Management System

    ITU-T Rec. G.984.4 (02/2008) 6

    NSCds Number of Subcarriers Downstream

    NSCus Number of Subcarriers Upstream

    NT Network Terminal

    OAN Optical Access Network 5 ODN Optical Distribution Network

    OLT Optical Line Terminal

    OMCC ONT Management and Control Channel

    OMCI ONT Management and Control Interface

    ONT Optical Network Terminal 10 ONU Optical Network Unit

    OpS Operations System

    PCF Point Coordination Function

    PHY Physical Interface

    PIR Peak Information Rate 15 PLCP Physical Layer Convergence Protocol

    PLOAM Physical Layer Operations, Administration and Maintenance

    PM Performance Monitoring

    PMD Physical Medium Dependent

    PMS-TC Physical Media Specific Transmission Convergence

    20 PON Passive Optical Network

    POTS Plain Old Telephone Service

    PPTP Physical Path Termination Point

    PSD Power Spectral Density

    PSN Packet switched network 25 PVC Permanent Virtual Circuit

    QoS Quality of Service

    RDI Remote Defect Indication

    RF Radio Frequency

    RFI Radio Frequency Interference

    RM Resource Management


    RTCP RTP Control Protocol

    RTP Real time protocol

    RTS Request To Send

    SAR Segmentation and Reassembly 35 SCM Single Carrier Modulation

    SES Severely Errored Second

    SIFS Short Interframe Space

    ITU-T Rec. G.984.4 (02/2008) 7

    SIP Session Initiation Protocol

    SIR Sustained Information Rate

    SME Station Management Entity

    SN Service Node

    5 SNI Service Node Interface

    SNR Signal to Noise Ratio

    SSCS Service Specific Convergence Sublayer

    STA Station

    TC Transmission Convergence 10 TCA Threshold Crossing Alert

    T-CONT Transmission Container

    TCI Tag Control Information

    TCP Transmission Control Protocol

    TDM Time division multiplex 15 TE Terminal Equipment

    TOS Type of Service

    TP Termination Point

    TU Time Unit

    TU TribuaryUnit

    20 UAS Unavailable Seconds

    UDP User Datagram Protocol

    UNI User Network Interface

    UPC Usage Parameter Control

    VBR Variable Bit Rate 25 VC Virtual Circuit

    VC Virtual Container (SDH)

    VCC Virtual Circuit Connection

    VCI Virtual Circuit Identifier

    VDSL Very High Speed Digital Subscriber Line (Note: G.993.2 VDSL2 is managed

    30 under the xDSL family of MEs.)

    VID VLAN Identifier

    VLAN Virtual local area network

    VoIP Voice over IP

    VP Virtual Path

    35 VPC Virtual Path Connection

    VPI Virtual Path Identifier

    VRP Video Return Path

    ITU-T Rec. G.984.4 (02/2008) 8

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