INTERNATIONAL TELECOMMUNICATION UNION
SERIES G: TRANSMISSION SYSTEMS AND MEDIA,
DIGITAL SYSTEMS AND NETWORKS
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
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.
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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.
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ITU-T Recommendation G.984.4
Gigabit-capable Passive Optical Networks (G-PON):
ONT management and control interface specification
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
 ITU-T Recommendation G.711 (1988) Pulse code modulation (PCM) of voice frequencies.
 ITU-T Recommendation G.722.1 (1999) Coding at 24 and 32 kbit/s for hands-free
operation in systems with low frame loss.
 ITU-T Recommendation G.722.2 (2003), Wideband coding of speech at around 16 kbit/s 5 using adaptive multi-rate wideband (AMR-WB).
 ITU-T Recommendation I.363.5 (1996), B-ISDN ATM adaptation layer specification: Type
 ITU-T Recommendation G.723.1 (2006), Dual rate speech coder for multimedia
communications transmitting at 5.3 and 6.3 kbit/s. 10  ITU-T Recommendation G.726 (1990), 40, 32, 24, 16 kbit/s adaptive differential pulse
code nodulation (ADPCM).
 ITU-T Recommendation G.729 (2007), Reduced complexity 8 kbit/s CS-ACELP speech
 ITU-T Recommendation G.983.2 (2005), ONT management and control interface 15 specification for B-PON.
 ITU-T Recommendation G.728 (1992), Coding of speech at 16 kbit/s using low-delay code
excited linear prediction.
 ITU-T Recommendation G.784 (1999), Synchronous digital hierarchy (SDH) management.
 ITU-T Recommendation H.248 series (various), Gateway control protocol.
20  ITU-T Recommendation H.341 (1999), Multimedia management information base.
 ITU-T Recommendation G.984.2 (2003), Gigabit-capable passive optical networks (G-
PON): Physical media dependent (PMD) layer specification.
 ITU-T Recommendation G.984.3 (2004), Gigabit-capable passive optical networks (G-
PON): Transmission convergence layer specification, plus Amendment 1 (2005). 25  ANSI T1.220 (2000), Information interchange – Coded representation of the North
American telecommunications industry manufacturers, suppliers, and related service
 IEEE 802.1D, Media access control (MAC) bridges.
 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.
 IETF RFC 2096 (1997), IP forwarding table MIB.
 SCTE 55-1 (2002), Digital broadband delivery system: Out of band transport part 1: mode
 SCTE 55-2 (2002), Digital broadband delivery system: Out of band transport part 2: mode
 ITU-T Recommendation G. 992.1 (1999), Asymmetric digital subscriber line (ADSL)
40  ITU-T Recommendation G. 992.3 (2005), Asymmetric digital subscriber line transceivers 2
 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
 ITU-T Recommendation G. 992.5 (2005), Asymmetric digital subscriber line (ADSL)
transceivers – Extended bandwidth ADSL2 (ADSL2).
 ITU-T Recommendation G.993.1 (2004), Very high speed digital subscriber line
5  ITU-T Recommendation G.993.2 (2006), Very high speed digital subscriber line
transceivers 2 (VDSL2).
 ITU-T Recommendation G.994.1 (2003), Handshake procedures for digital subscriber line
 ITU-T Recommendation G.997.1 (2006), Physical layer management for digital subscriber
10 line (DSL) transceivers.
 ITU-T Recommendation T.35 (2000), Procedure for the allocation of ITU-T defined codes
for non-standard facilities.
 ITU-T Recommendation T.38 (2005), Procedures for real-time group 3 facsimile
communication over IP networks.
15  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:
 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.
 ANSI T1.413 (1998), Network to customer installation interfaces – Asymmetric digital
subscriber line (ADSL) metallic interface.
 DSLF TR-69 (2004), CPE WAN management protocol.
 Metro Ethernet Forum MEF8 (2004), Implementation agreement for the emulation of PDH
25 circuits over metro Ethernet networks.
 IEEE 802.1Q (2005), Virtual bridged local area networks.
 IETF RFC 815 (1982), IP datagram reassembly algorithms.
 IETF RFC 1349 (1992), Type of service in the internet protocol suite.
 IETF RFC 1483 (1993), Multiprotocol encapsulation over ATM adaptation layer 5. 30  IETF RFC 2069 (1997), An extension to HTTP : Digest access authentication.
 IETF RFC 2617 (1999), HTTP authentication: Basic and digest access authentication.
 IETF RFC 2833 (2000), RTP payload for DTMF digits, telephony tones and telephony
 IETF RFC 3551 (2003), RTP profile for audio and video conferences with minimal control. 35  IETF RFC 4733 (2006), RTP payload for DTMF digits, telephony tones, and telephony
 IETF RFC 4734 (2006), Definition of events for modem, fax, and text telephony signals.
 ITU-T Recommendation M.3100 (2005), Generic network information model.
 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
3.1 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
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
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
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
10 IP Internet Protocol
ISDN Integrated Services Digital Network
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
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
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
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