Recommendation ITU-T G.9807.1 Corrigendum 1 (03/2020) 10-Gigabit-capable symmetric passive optical network (XGS-PON) Corrigendum 1
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
     5.1 Optical access concepts
     5.2 Multi-wavelength PON system reference points
     5.3 Optical power and loss parameters
     5.4 Dynamic range, sensitivity and overload
     5.5 Sensitivity and overload in the presence of FEC
     5.6 Reach and distance
     5.7 Use of the term PON
     5.8 Use of the term ODN
     5.9 Use of the terms ONU and ONT
     5.10 Use of the terms T-CONT and Alloc-ID
     5.11 Use of the terms bandwidth assignment and bandwidth allocation
     5.12 Use of the terms band and range
     5.13 Transmitter enable control and associated transient times
6 Overview of the XGS-PON Recommendation
Annex A  General requirements of XGS-PON
     A.5 Architecture of the optical access network
          A.5.1 Network architecture
               A.5.1.1 FTTB scenario
                    A.5.1.1.1 FTTB for MDU-served residential users
                    A.5.1.1.2 FTTB for MTU-served business users
               A.5.1.2 FTTC and FTTCab scenario
               A.5.1.3 FTTH scenario
               A.5.1.4 FTTO scenario
               A.5.1.5 FTTCell wireless scenario
               A.5.1.6 FTTdp scenario
               A.5.1.7 Environment conditions in outdoor scenarios
          A.5.2 Reference configuration
               A.5.2.1 ODN architectures
               A.5.2.2 Legacy operating wavelength for G-PON and XG-PON
               A.5.2.3 Operating wavelength options for XGS-PON
               A.5.2.4 User network interface (UNI) and service node interface (SNI)
               A.5.2.5 Interface at reference points S/R and R/S
               A.5.2.6 Layered structure of XGS-PON optical network
     A.6 Migration scenarios
          A.6.1 Migration from legacy PON to XGS-PON
          A.6.2 Migration from XG-PON to XGS-PON
          A.6.3 RE architecture options
          A.6.4 Migration from XGS-PON to NG-PON2
     A.7 Service requirements
          A.7.1 Services
          A.7.2 User network interfaces to be considered
          A.7.3 Service node interfaces (SNIs)
          A.7.4 Maximum/mean signal transfer delay tolerance
          A.7.5 Maximum Ethernet packet size
          A.7.6 Synchronization features and quality
          A.7.7 Leased line T1/E1 emulation
          A.7.8 QoS and traffic management
     A.8 Physical layer requirements
          A.8.1 Fibre characteristics
          A.8.2 Optical wavelengths of XGS-PON
          A.8.3 Bit rates
          A.8.4 Optical power budget
          A.8.5 Split ratio
          A.8.6 Fibre distance
     A.9 System level requirements
          A.9.1 Power saving and energy efficiency
          A.9.2 Authentication/identification/encryption
          A.9.3 Dynamic bandwidth assignment (DBA)
          A.9.4 Eye safety
          A.9.5 Dual-rate support
     A.10 Operational requirements
          A.10.1 ONU management
               A.10.1.1 OMCI managed ONU
               A.10.1.2 Dual managed ONU
          A.10.2 PON supervision
     A.11 Resilience and protection on ODN
Appendix A.I  Examples of practical XGS-PON system architecture
     A.I.1 Typical system architectures
          A.I.1.1 OLT variants
          A.I.1.2 ONU variants
     A.I.2 Service protocol stacks
          A.I.2.1 Common functions
          A.I.2.2 Data functions
          A.I.2.3 Voice functions
          A.I.2.4 Circuit emulation functions
          A.I.2.5 Video overlay functions
Appendix A.II  Synchronizing requirements for wireless in CBU scenario
Appendix A.III  External access network back-up
     A.III.1 External access network back-up
Appendix A.IV  Operation with IEEE 1588
Appendix A.V  Use cases for frequency and time of day synchronization
Appendix A.VI  Transport of ESMC messages over PON
Annex B  Physical media dependent (PMD) layer specifications of XGS-PON
     B.6 Architecture of the optical access network
          B.6.1 Classes for optical path loss
          B.6.2 Categories for fibre differential distance
     B.7 Services
     B.8 User network interface and service node interface
     B.9 Optical network requirements
          B.9.1 Layered structure of optical network
          B.9.2 Physical media dependent layer requirements for the XGS-PON
               B.9.2.1 Line rate
                    B.9.2.1.1 Downstream accuracy
                    B.9.2.1.2 Upstream accuracy
               B.9.2.2 FEC code selection for XGS-PON
               B.9.2.3 Physical media and transmission method
                    B.9.2.3.1 Transmission medium
                    B.9.2.3.2 Transmission direction
                    B.9.2.3.3 Transmission methodology
               B.9.2.4 Line code
                    B.9.2.4.1 Downstream
                    B.9.2.4.2 Upstream
               B.9.2.5 Operating wavelength
                    B.9.2.5.1 Downstream wavelength allocation
                    B.9.2.5.2 Upstream wavelength allocation
               B.9.2.6 XGS-PON PMD parameters
                    B.9.2.6.1 XGS-PON compatible ODN
                    B.9.2.6.2 Optical interface parameters of 9.95328 Gbit/s downstream direction for the basic wavelength set
                    B.9.2.6.3 Optical interface parameters of 9.95328 Gbit/s upstream direction for the basic wavelength set
                    B.9.2.6.4 Optical interface parameters of 9.95328 Gbit/s downstream direction for the optional wavelength set
                    B.9.2.6.5 Optical interface parameters of 9.95328 Gbit/s upstream direction for the optional wavelength set
               B.9.2.7 Transmitter at Old and Oru
                    B.9.2.7.1 Source type
                    B.9.2.7.2 Spectral characteristics
                    B.9.2.7.3 Mean launched power
                         B.9.2.7.3.1 Launched optical power without input to the transmitter
                    B.9.2.7.4 Minimum extinction ratio
                    B.9.2.7.5 Maximum reflectance of equipment, measured at transmitter wavelength
                    B.9.2.7.6 Mask of transmitter eye diagram
                         B.9.2.7.6.1 OLT transmitter
                         B.9.2.7.6.2 ONU transmitter
                    B.9.2.7.7 Transmitter tolerance to reflected optical power
               B.9.2.8 Optical path between Old/Oru and Ord/Olu
                    B.9.2.8.1 Attenuation range
                    B.9.2.8.2 Minimum optical return loss of the cable plant at point R/S, including any connectors
                    B.9.2.8.3 Maximum discrete reflectance between points S and R
                    B.9.2.8.4 Dispersion
               B.9.2.9 Receiver at Ord and Olu
                    B.9.2.9.1 Receiver sensitivity
                    B.9.2.9.2 Receiver overload
                    B.9.2.9.3 Maximum optical path penalty
                    B.9.2.9.4 Maximum reflectance at R/S, measured at receiver wavelength
                    B.9.2.9.5 Differential optical path loss
                    B.9.2.9.6 Clock extraction capability
                    B.9.2.9.7 Jitter performance
                         B.9.2.9.7.1 Jitter transfer
                         B.9.2.9.7.2 Jitter tolerance
                         B.9.2.9.7.3 Jitter generation
                    B.9.2.9.8 Consecutive identical digit (CID) immunity
                    B.9.2.9.9 Receiver tolerance to reflected power
                    B.9.2.9.10  Transmission quality and error performance
     B.10 X/S tolerance of XGS-PON ONU
          B.10.1 Versatile WDM configuration
     B.11 Upstream physical layer overhead
Appendix B.I  Examples of wavelength allocation for XGS-PON, G-PON  and video distribution services
Appendix B.II  Physical layer measurements required to support optical layer supervision
     B.II.1 Introduction
     B.II.2 Transceiver parameters monitoring
     B.II.3 Measurement table for transceiver parameters
     B.II.4 OLS physical layer performance measurements requirements
Appendix B.III  Allocation of the physical layer overhead time
Appendix B.IV  Jitter budget specifications
     B.IV.1 The concept of jitter budget
     B.IV.2 Definition of test points
     B.IV.3 Jitter budget specification for XGS-PON
     B.IV.4 Jitter measurements for compliance to budget
Appendix B.V  Measurement of burst mode acquisition time and burst mode eye opening at OLT
Appendix B.VI  Upstream PMD examples for XGS-PON
Appendix B.VII   Raman analysis in XGS-PON optional wavelength set
Annex C  Transmission convergence layer specifications of XGS-PON
     C.6 XGS-PON transmission convergence layer overview
          C.6.1 XGS-PON transmission convergence layer
               C.6.1.1 Supported nominal line rates
               C.6.1.2 XGS-PON TC layer structure
               C.6.1.3 XGS-PON TC sublayer functions
                    C.6.1.3.1 XGS-PON TC service adaptation sublayer
                    C.6.1.3.2 XGS-PON TC framing sublayer
                    C.6.1.3.3 XGS-PON TC PHY adaptation sublayer
               C.6.1.4 Management of a XGS-PON system
                    C.6.1.4.1 Embedded OAM
                    C.6.1.4.2 PLOAM channel
                    C.6.1.4.3 ONU management and control channel (OMCC)
                    C.6.1.4.4 ICTP
               C.6.1.5 Time division multiplexing architecture
                    C.6.1.5.1 Overview
                    C.6.1.5.2 NG-PON2 system identifier
                    C.6.1.5.3 PON-ID
                    C.6.1.5.4 Downstream wavelength channel identifier
                    C.6.1.5.5 Upstream wavelength channel identifier
                    C.6.1.5.6 ONU identifier
                    C.6.1.5.7 Allocation identifier (Alloc-ID)
                    C.6.1.5.8 XGEM port identifier
                    C.6.1.5.9 Channel partition index
               C.6.1.6 Media access control
          C.6.2 PtP WDM AMCC transmission convergence layer overview
     C.7 Resource allocation and quality of service
          C.7.1 Principles of downstream and upstream resource allocation
          C.7.2 Dynamic bandwidth assignment overview
               C.7.2.1 DBA abstraction
               C.7.2.2 DBA functional requirements
               C.7.2.3 DBA methods
          C.7.3 Reference model of dynamic bandwidth assignment
               C.7.3.1 Summary of notations
               C.7.3.2 Offered traffic load
               C.7.3.3 Components of assigned bandwidth
               C.7.3.4 Guaranteed bandwidth assignment
               C.7.3.5 Rate-proportional assignment of additional bandwidth
               C.7.3.6 Additional bandwidth assignment based on priority and weights
          C.7.4 DBA performance requirements
               C.7.4.1 Stationary bandwidth assignment
               C.7.4.2 Assured bandwidth restoration time
               C.7.4.3 DBA convergence time
     C.8 XGS-PON transmission convergence framing sublayer overview
          C.8.1 XGS-PON transmission convergence framing sublayer
               C.8.1.1 Downstream XGS-PON TC framing
                    C.8.1.1.1 HLend structure
                    C.8.1.1.2 BWmap partition
                         C.8.1.1.2.1 Alloc-ID field
                         C.8.1.1.2.2 Flags field
                         C.8.1.1.2.3 StartTime field
                         C.8.1.1.2.4 GrantSize field
                         C.8.1.1.2.5 Forced wake-up indication (FWI) bit
                         C.8.1.1.2.6 BurstProfile field
                         C.8.1.1.2.7 HEC field
                    C.8.1.1.3 BWmap construction and parsing rules
                    C.8.1.1.4 PLOAMd partition
                    C.8.1.1.5 FS frame trailer
               C.8.1.2 Upstream XGS-PON TC framing
                    C.8.1.2.1 Upstream FS header
                         C.8.1.2.1.1 ONU-ID field
                         C.8.1.2.1.2 Ind field
                         C.8.1.2.1.3 HEC field
                         C.8.1.2.1.4 Upstream PLOAM (PLOAMu) field
                    C.8.1.2.2 Allocation overhead
                         C.8.1.2.2.1 BufOcc field
                         C.8.1.2.2.2 CRC field
                    C.8.1.2.3 Upstream FS burst trailer
          C.8.2 PtP WDM management framing sublayer
     C.9 XGS-PON encapsulation method
          C.9.1 XGEM framing
               C.9.1.1 FS payload structure
               C.9.1.2 XGEM frame header
               C.9.1.3 XGEM payload format
               C.9.1.4 Idle XGEM frame
          C.9.2 XGEM frame delineation
          C.9.3 SDU fragmentation
          C.9.4 Mapping of services into XGEM frames
               C.9.4.1 Ethernet over XGEM
               C.9.4.2 MPLS over XGEM
     C.10 XGS-PON PHY adaptation sublayer
          C.10.1 XGS-PON PHY adaptation sublayer
               C.10.1.1 Downstream PHY frame
                    C.10.1.1.1 Downstream physical synchronization block (PSBd)
                         C.10.1.1.1.1 Physical synchronization sequence (PSync)
                         C.10.1.1.1.2 Superframe counter structure
                         C.10.1.1.1.3 Operation control structure
                    C.10.1.1.2 PSBd field scrambling
                    C.10.1.1.3 ONU downstream synchronization
                    C.10.1.1.4  Downstream PHY frame payload
               C.10.1.2 Upstream PHY frames and upstream PHY bursts
                    C.10.1.2.1  Upstream physical synchronization block (PSBu)
                    C.10.1.2.2  Upstream PHY burst payload
                    C.10.1.2.3  Guard time
               C.10.1.3 Forward error correction
                    C.10.1.3.1  Downstream FEC
                         C.10.1.3.1.1 Downstream FEC codeword
                         C.10.1.3.1.2 Downstream FEC on/off control
                    C.10.1.3.2  Upstream FEC
                         C.10.1.3.2.1 Upstream FEC codeword
                         C.10.1.3.2.2 Shortened last codeword
                         C.10.1.3.2.3 BWmap considerations
                         C.10.1.3.2.4 Upstream FEC on/off control
               C.10.1.4 Scrambling
                    C.10.1.4.1 Scrambling of the downstream PHY frame
                    C.10.1.4.2  Scrambling of the upstream PHY burst
          C.10.2 PtP WDM management PHY adaptation sublayer
     C.11 PLOAM messaging channel
          C.11.1 Overview
               C.11.1.1 PLOAM channel functionality
               C.11.1.2 PLOAM channel rate limitations
               C.11.1.3 PLOAM channel robustness
               C.11.1.4 Extensibility
          C.11.2 PLOAM message format
               C.11.2.1 ONU-ID
               C.11.2.2 Message type ID
               C.11.2.3 SeqNo
               C.11.2.4 Message content
               C.11.2.5 Message integrity check
               C.11.2.6 Common elements of PLOAM message format
                    C.11.2.6.1 Vendor_ID
                    C.11.2.6.2  VSSN
                    C.11.2.6.3  Correlation tag
                    C.11.2.6.4  Calibration record status
                    C.11.2.6.5  Tuning granularity
                    C.11.2.6.6  One-step tuning time
                    C.11.2.6.7  Attenuation
                    C.11.2.6.8  Power levelling capability
          C.11.3 PLOAM message definitions
               C.11.3.1 Downstream PLOAM message summary
               C.11.3.2 Upstream PLOAM message summary
               C.11.3.3 Downstream PLOAM message formats
                    C.11.3.3.1  Burst_Profile message
                    C.11.3.3.2  Assign_ONU-ID message
                    C.11.3.3.3  Ranging_Time message
                    C.11.3.3.4  Deactivate_ONU-ID message
                    C.11.3.3.5  Disable_Serial_Number message
                    C.11.3.3.6  Request_Registration message
                    C.11.3.3.7 Assign_Alloc-ID message
                    C.11.3.3.8  Key_Control message
                    C.11.3.3.9  Sleep_Allow message
                    C.11.3.3.10  Calibration_Request message
                    C.11.3.3.11  Adjust_Tx_Wavelength message
                    C.11.3.3.12  Tuning_Control message
                    C.11.3.13 System_Profile message
                    C.11.3.3.14 Channel_Profile message
                    C.11.3.3.15 Protection_Control message
                    C.11.3.3.16 Change_Power_Level message
                    C.11.3.3.17 Power_Consumption_Inquire message
                    C.11.3.3.18 Rate_Control message
                    C.11.3.3.19 Reboot_ONU message
               C.11.3.4 Upstream PLOAM message formats
                    C.11.3.4.1  Serial_Number_ONU message
                    C.11.3.4.2  Registration message
                    C.11.3.4.3  Key_Report message
                    C.11.3.4.4  Acknowledgement message
                    C.11.3.4.5  Sleep_Request message
                    C.11.3.4.6  Tuning_Response message
                    C.11.3.4.7  Power_Consumption_Report message
                    C.11.3.4.8  Rate_Response message
     C.12 XGS-PON ONU activation
          C.12.1 XGS-PON ONU activation cycle
               C.12.1.1 Overview
               C.12.1.2 Activation outline
               C.12.1.3 Causal sequence of activation events
               C.12.1.4 XGS-PON ONU activation cycle state machine
                    C.12.1.4.1  States, timers and inputs
                    C.12.1.4.2  ONU state diagram
                    C.12.1.4.3  ONU state transition table
               C.12.1.5 OLT support of the XGS-PON ONU activation
               C.12.1.6 ONU power levelling
                    C.12.1.6.1 ONU-Activated power levelling
                    C.12.1.6.2 OLT-Activated power levelling
          C.12.2 PtP WDM ONU activation cycle
     C.13 XGS-PON OLT and ONU timing relationships
          C.13.1 ONU transmission timing and equalization delay
               C.13.1.1 Timing of ONU upstream transmissions
               C.13.1.2 Timing relationships and quiet window during serial number acquisition
               C.13.1.3 Timing relationships and quiet window during ranging
               C.13.1.4 Calculating the equalization delay
               C.13.1.5 Timing relationships during operation
               C.13.1.6 In-service equalization delay adjustment
               C.13.1.7 Quiet window implementation considerations
               C.13.1.8 Fibre distance measurement
          C.13.2 Time of day distribution
               C.13.2.1 Notation
               C.13.2.2 ONU clock synchronization process
               C.13.2.3 Performance analysis
                    C.13.2.3.1  Equalization delay accuracy
                    C.13.2.3.2  Fibre propagation delay
                    C.13.2.3.3  Internal timing corrections
          C.13.3 PtP WDM ONU transmission timing
     C.14 XGS-PON performance monitoring, supervision and defects
          C.14.1 Performance monitoring
          C.14.2 Defects
               C.14.2.1 Items detected at OLT
               C.14.2.2 Items detected at ONU
               C.14.2.3 Urgent ONU status snapshot record
     C.15 XGS-PON security
          C.15.1 Threat model
          C.15.2 Authentication
               C.15.2.1 Registration-based authentication
                    C.15.2.1.1  The OLT perspective
                    C.15.2.1.2  The ONU perspective
               C.15.2.2 Secure mutual authentication options
          C.15.3 Key derivation
               C.15.3.1 Cryptographic method
               C.15.3.2 Master session key
               C.15.3.3 Derived shared keys
          C.15.4 XGEM payload encryption system
               C.15.4.1 Cryptographic method
               C.15.4.2 Secret key selection
               C.15.4.3 Initial counter block
          C.15.5 Data encryption key exchange and activation mechanism
               C.15.5.1 Overview
               C.15.5.2 Cryptographic method
               C.15.5.3 Unicast encryption
                    C.15.5.3.1 Sequence of encryption key exchange and activation events
                    C.15.5.3.2  OLT states and state diagram
                    C.15.5.3.3  ONU states and state diagram
               C.15.5.4 Downstream multicast encryption
          C.15.6 Integrity protection and data origin verification for PLOAM
               C.15.6.1 Cryptographic method
               C.15.6.2 MIC calculation
          C.15.7 Integrity protection and data origin verification for OMCI
               C.15.7.1 Cryptographic method
               C.15.7.2 MIC calculation
          C.15.8 Integrity and data origin verification key switching
               C.15.8.1 Use of the default key
               C.15.8.2 Key switching for OMCI-based secure mutual authentication
               C.15.8.3 Key switching for IEEE 802.1x-based authentication
               C.15.8.4 MIC failure considerations
          C.15.9 XGS-PON systems with reduced data encryption strength
               C.15.9.1 Effective key length
               C.15.9.2 Data encryption key format
     C.16 XGS-PON power management
          C.16.1 XGS-PON power management
               C.16.1.1 Power management configuration and signalling
               C.16.1.2 Power management parameter definitions
               C.16.1.3 Power management state machine specifications
                    C.16.1.3.1 XGS-PON ONU state machine
                    C.16.1.3.2  OLT state machine
               C.16.1.4 Management transactions in the LowPower state
               C.16.1.5 Power saving by channel selection
          C.16.2 PtP WDM power management
     C.17 Channel management
     C.18 XGS-PON system protection
          C.18.1 OLT coordination in type B XGS-PON protection
          C.18.2 OLT state coordination using inter-channel-termination protocol
     C.19 Rogue behaviour and its mitigation
          C.19.1 Rogue ONU behaviour model in XGS-PON
          C.19.2 Rogue ONU behaviour model for PtP WDM
          C.19.3 Behaviour model when coexisting with ITU-T G.984, ITU-T G.987 and ITU-T G.989 ONUs
               C.19.3.1 Silent start at the ONU
               C.19.3.2 Silent start at the OLT port
               C.19.3.3 OLT port detection of rogue devices
          C.19.4 Protection from noise and alien ONUs
          C.19.5 Troublesome ONU presence detection enabled through idle window
Annex C.A  Hybrid error control (HEC) decoding and scrambler sequence codes
     C.A.1 HEC decoding
     C.A.2 Scrambler sequence
Annex C.B  Forward error-correction using shortened Reed-Solomon codes
Annex C.C  Secure mutual authentication via OMCI
Annex C.D  Secure mutual authentication using IEEE 802.1X
Annex C.E  Auxiliary management and control channel
Annex C.F  Tuning sequences
Annex C.G  Transcoded framing with FEC and OAM for PtP WDM AMCC TC
Appendix C.I  Downstream line data pattern conditioning
Appendix C.II  Time of day derivation and error analysis
Appendix C.III  Burst profiles
Appendix C.IV  Golden vectors
     C.IV.1 10G downstream and upstream FEC codeword
     C.IV.2 10G upstream FEC short codeword
     C.IV.3 2.5G downstream and upstream FEC codeword
     C.IV.4 2.5G downstream and upstream FEC short codeword
     C.IV.5 Downstream AES-128 encryption
     C.IV.6 Upstream AES-128 encryption
     C.IV.7 Key derivation encryption
     C.IV.8 Downstream PLOAM message integrity check
     C.IV.9 Upstream PLOAM message integrity check
     C.IV.10 Upstream key reporting
     C.IV.11 Downstream OMCI message integrity check
Appendix C.V  Protection examples
Appendix C.VI  ICTP: Inter-channel-termination protocol
     C.VI.1 ICTP use cases
     C.VI.2 ICTP primitives description
Appendix C.VII  ONU equalization delay coordination across TWDM channels
Appendix C.VIII  PON-ID examples
Appendix I   Introduction of PMD parameters
     I.1 Relationship between OMA, extinction ratio, and average power
Appendix II  General statements on the relationship with NG-PON2 TC layer requirements
Appendix III   Use of 10GEPON 10GBASE-PR-D3 (OLT) and 10GBASE-PR-U3 (ONU) optical modules with XGS-PON symmetric
Bibliography