Rec. ITU-T G.984.3 Amendment 1 (03/2020) Gigabit-capable passive optical networks (G-PON): Transmission convergence layer specification
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions and terminology
5.1 ONT and ONU
5.2 Data encapsulation method and deprecation of ATM transport
5.3 Traffic monitoring versus non-status-reporting
5.4 Bandwidth assignment versus bandwidth allocation
5.5 G-PON time division multiplexing architecture
5.5.1 Overview
5.5.2 ONU identifier (ONU-ID)
5.5.3 Allocation identifier (Alloc-ID)
5.5.4 Transmission container (T-CONT)
5.5.5 GEM port identifier
5.6 Disambiguation of the concept of frame
5.7 Concepts associated with upstream physical layer overhead
6 G-PON system architecture
6.1 Network architecture and reference configuration
6.2 Parameters of the GTC layer
6.3 Functional blocks
6.3.1 Optical line termination (OLT)
6.3.2 Optical network unit (ONU)
6.3.3 Optical distribution network (ODN)
6.4 Interoperability between G-PON and B-PON
7 G-PON transmission convergence layer overview
7.1 GTC protocol stack
7.1.1 GTC sublayers
7.1.2 Protocol stack for the C/M-plane
7.1.3 Protocol stack for the U-plane
7.2 GTC key functions
7.2.1 Media access control
7.2.2 ONU registration
7.3 Functions of Sublayers in GTC
7.3.1 Overview of GTC framing sublayer
7.3.2 Overview of GTC adaptation sublayer and interface for upper entities
7.3.3 Overview of PLOAM
7.4 Dynamic bandwidth assignment
7.4.1 PON DBA abstraction
7.4.2 DBA functional requirements
7.4.3 DBA methods
7.4.4 Mathematical model of dynamic bandwidth assignment
7.4.4.1 Summary of notation
7.4.4.2 Offered traffic load
7.4.4.3 Traffic descriptor
7.4.4.4 Components of assigned bandwidth
7.4.4.5 Guaranteed bandwidth assignment
7.4.4.6 Non-assured bandwidth assignment
7.4.4.7 Best-effort bandwidth assignment
7.4.4.8 Prioritization of assigned bandwidth components
7.4.5 Extended bandwidth assignment model
7.4.6 Alloc-ID traffic descriptors and T-CONT types
7.4.7 DBA performance requirements
7.4.7.1 Stationary bandwidth assignment
7.4.7.2 Assured bandwidth restoration time
7.4.7.3 DBA convergence time
7.5 Resource allocation and quality of service (QoS)
8 GTC layer framing
8.1 Downstream GTC frame structure
8.1.1 Bit and byte order
8.1.2 Scrambling of the downstream GTC frame
8.1.3 Physical control block downstream (PCBd)
8.1.3.1 Physical synchronization (PSync) field
8.1.3.2 Ident field
8.1.3.3 PLOAMd field
8.1.3.4 BIP field
8.1.3.5 PLend field
8.1.3.6 BWmap fields
8.1.3.6.1 Allocation ID field
8.1.3.6.2 Flags field
8.1.3.6.3 StartTime field
8.1.3.6.4 StopTime field
8.1.3.6.5 CRC field
8.1.4 TC payload fields
8.2 Upstream burst structure
8.2.1 Scrambling of the upstream burst
8.2.2 Physical layer overhead upstream (PLOu)
8.2.2.1 BIP field
8.2.2.2 ONU-ID field
8.2.2.3 Ind field
8.2.3 PLOAM upstream (PLOAMu)
8.2.4 Power levelling sequence upstream (PLSu)
8.2.5 Dynamic bandwidth report upstream (DBRu)
8.2.5.1 DBA field
8.2.5.2 CRC field
8.2.6 Upstream GTC payload section
8.3 Mapping of GEM frames into GTC payload
8.3.1 GEM header format
8.3.2 GEM frame delineation and synchronization
8.3.3 User frame fragmentation
8.3.4 Mapping of user services into GEM frames
8.4 Status reporting DBA signalling and configuration
8.4.1 Definition of the DBRu report
8.4.2 Buffer occupancy representation
8.4.3 DBRu format modes
8.4.4 Options available to the ONU and OLT
8.4.5 Backward compatibility and handling of exceptional cases
8.4.6 Implementation note on Mode 1 DBRu reporting
9 GTC messages
9.1 PLOAM message format
9.1.1 ONU-ID
9.1.2 Message-ID
9.1.3 Message data
9.1.4 CRC
9.2 Control messages
9.2.1 Downstream message definition
9.2.2 Upstream message definition
9.2.3 Downstream message formats
9.2.3.1 Upstream_Overhead message
9.2.3.2 Serial_Number_Mask message
9.2.3.3 Assign_ONU-ID message
9.2.3.4 Ranging_Time message
9.2.3.5 Deactivate_ONU-ID message
9.2.3.6 Disable_Serial_Number message
9.2.3.7 Configure_VP/VC message
9.2.3.8 Encrypted_Port-ID message
9.2.3.9 Request_Password message
9.2.3.10 Assign_Alloc-ID message
9.2.3.11 No message
9.2.3.12 POPUP message
9.2.3.13 Request_Key message
9.2.3.14 Configure_Port-ID message
9.2.3.15 Physical_Equipment_Error (PEE) message
9.2.3.16 Change_Power_Level (CPL) message
9.2.3.17 PST message
9.2.3.18 BER Interval message
9.2.3.19 Key_Switching_Time message
9.2.3.20 Extended_Burst_Length message
9.2.4 Upstream message formats
9.2.4.1 Serial_Number_ONU message
9.2.4.2 Password message
9.2.4.3 Dying_Gasp message
9.2.4.4 No message
9.2.4.5 Encryption_Key message
9.2.4.6 Physical_Equipment_Error (PEE) message
9.2.4.7 PST message
9.2.4.8 REI message
9.2.4.9 Acknowledge message
10 Activation method
10.1 Overview
10.1.1 Definitions
10.1.2 Causal sequence of activation events
10.2 Activation mechanism at the ONU
10.2.1 ONU activation states, timers and counters
10.2.2 ONU state specification
10.2.3 ONU state diagram
10.2.4 ONU functional transitions
10.2.5 ONU events
10.2.5.1 Downstream (DS) PLOAM message reception events
10.2.5.2 DS bandwidth map reception events
10.2.5.3 Other events
10.3 OLT support of the activation process
10.3.1 OLT common part
10.3.2 ONU-specific part
10.3.3 Quiet window creation
10.3.4 Activation process failure detection
10.3.5 Phase monitoring and updating equalization delay
10.3.6 Fibre distance measurement
10.4 OLT and ONU timing relationships
10.4.1 Timing of ONU upstream transmissions
10.4.2 Timing relationships during serial number acquisition
10.4.2.1 ONU upstream transmission
10.4.2.2 Size of the quiet window during serial number acquisition
10.4.3 Timing relationships during ranging
10.4.3.1 ONU upstream transmission
10.4.3.2 Size of the quiet window during ranging
10.4.3.3 Measuring the equalization delay
10.4.3.4 PON distances greater than 20 km
10.4.4 ONU upstream transmission timing during regular operation
10.4.5 Quiet window implementation considerations
10.4.6 Time of day distribution over G-PON
10.4.6.1 Notation
10.4.6.2 Timing process
10.4.6.3 Performance analysis
10.4.6.3.1 EqD accuracy
10.4.6.3.2 Fibre propagation delay
10.4.6.3.3 Internal timing corrections
10.5 Power levelling
10.5.1 ONU-activated power levelling
10.5.2 OLT-activated power levelling
11 Alarms and performance monitoring
11.1 Alarms
11.1.1 Items detected at OLT
11.1.2 Items detected at ONU
11.1.3 SD and SF thresholds specifications
11.2 Performance monitoring
11.2.1 Items detected at OLT
11.2.2 Items detected at ONU
11.2.3 Performance monitoring events
12 Security
12.1 Basic threat model
12.2 Encryption system
12.3 Data encryption key exchange
12.4 Data encryption key switch-over
13 Forward error correction
13.1 Introduction
13.1.1 Reed-Solomon encoding
13.1.2 FEC interoperability between OLT and ONU
13.1.2.1 Downstream interoperability
13.1.2.2 Upstream interoperability
13.1.3 FEC statistics for performance monitoring
13.2 Downstream FEC
13.2.1 DS frame with FEC structure
13.2.1.1 Parity bytes
13.2.1.2 Shorter last codeword
13.2.2 FEC codeword synchronization
13.2.2.1 Frame synchronization at ONU
13.2.2.2 Codeword synchronization
13.2.3 Downstream FEC on/off control
13.2.3.1 DS FEC indication bit
13.2.3.2 DS FEC on/off detection behaviour at ONU receiver
13.3 Upstream FEC
13.3.1 Upstream transmission with FEC structure
13.3.1.1 Parity bytes
13.3.1.2 Shorter last codeword
13.3.1.3 ONU transmission size
13.3.2 FEC codeword synchronization
13.3.2.1 Transmission synchronization
13.3.2.2 Delimiter errors
13.3.3 US FEC on/off
13.3.3.1 US FEC indication bit
13.3.3.2 US FEC on/off detection behaviour at OLT
13.4 ONU activation transmissions
14 OMCI transport mechanism
14.1 OMCI transport schema
14.2 OMCI adapters
A.1 Introduction
A.2 AES mechanism and golden vectors
A.2.1 Key_Switching_Time message structure
A.2.2 AES encryption golden vector
A.2.3 AES with DS FEC golden vector
A.3 FEC encoding golden vector
A.4 Scrambler diagram
A.5 A downstream frame example
A.6 ONU activation process
A.6.1 Assumptions
A.6.2 State O1
A.6.3 State O2
A.6.4 State O3
A.6.4.1 Extended_Burst_Length PLOAM message
A.6.4.2 Serial number request message
A.6.4.3 Serial number response message
A.6.4.4 Assign_ONU-ID message
A.6.5 State O4
A.6.5.1 Ranging request
A.6.5.2 Ranging response
A.6.5.3 Ranging_Time PLOAM message
A.7 PLOAM messages
A.7.1 Acknowledge PLOAM message
A.8 Transmitter block diagram
B.1 Introduction
B.2 Secure mutual authentication and data key encryption
B.2.1 Pre-shared secret
B.2.2 Master session key
B.2.3 Data encryption key exchange
B.3 G-PON systems with reduced data encryption strength
B.3.1 Effective key length
B.3.2 Data encryption key format
C.1 Introduction
C.2 PON-ID PLOAM message
C.2.1 New downstream message type
C.2.2 PON-ID message description
D.1 Introduction
D.2 New downstream PLOAM message types
D.3 New downstream PLOAM message descriptions
D.3.1 Swift_POPUP message
D.3.2 Ranging_Adjustment message
D.4 Modified activation state diagram
E.1 Introduction
E.2 PLOAM channel modification
E.2.1 Downstream message definition
E.2.2 Upstream message definition
E.2.3 Downstream message format
E.2.4 Upstream message format
E.3 Bandwidth map flag modification
E.4 Alarm modification
E.5 ONU power management protocol
E.5.1 Power management configuration and signalling
E.5.2 Power management parameter definitions
E.5.3 Power management state machine specifications
E.5.3.1 ONU state machine
E.5.3.2 OLT state machine
E.5.4 Management transactions during low power mode
I.1 Mapping of GEM frames into the GTC payload
I.2 TDM over GEM
I.3 Ethernet over GEM
I.4 SDH over GEM
I.4.1 Review of SDH TU structures
I.4.2 Transport of TU structures over GEM
I.5 IP over GEM
I.6 MPLS over GEM
IV.1 Common part
IV.1.1 States of the OLT common part
IV.1.2 Common part state diagram
IV.1.3 Functional transition table for the common part
IV.1.4 Events of the OLT common part
IV.2 ONU-specific part
IV.2.1 States of the ONU-specific part
IV.2.2 State diagram of the ONU-specific part
IV.2.3 Functional behaviour table for the ONU-specific part
IV.2.4 Events of the ONU-specific part
IV.3 Automatic ONU Discovery Method
IV.3.1 Type of activation process
IV.3.1.1 Cold PON, cold ONU
IV.3.1.2 Warm PON, cold ONU
IV.3.1.3 Warm PON, warm ONU
IV.4 POPUP process
V.1 Idle pattern control
V.1.1 Scrambler phase-independent payload
V.1.2 Scrambler phase-dependent payload
V.2 Intentional PON disruption
VI.1 Authentication by serial number
VI.2 Authentication by PLOAM password
VI.3 Other forms of authentication