Recommendation ITU-T G.9711 (04/2021) Multi-gigabit fast access to subscriber terminals (MGfast) – Physical layer specification
Summary
History
Keywords
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 Reference models
     5.1 System reference model
     5.2 Application reference models
          5.2.1 In-premises telephone wiring
          5.2.2 In-premises coaxial wiring
     5.3 МTU protocol reference model
     5.4 MTU functional model
     5.5 L2+ queues and QoS channels reference model
          5.5.1 Downstream L2+ queues and QoS channels
          5.5.2 Upstream L2+ queues and QoS channels
          5.5.3 QoS channels in P2MP scenario
     5.6 INP system requirements
6 Profiles
     6.1 Definition
     6.2 Profile compliance
7 Transmission medium interface characteristics
     7.1 Duplexing method
     7.2 Frequency band
     7.3 Power spectral density
          7.3.1 Transmit PSD mask
               7.3.1.1 MIBPSDMASK construction
                    7.3.1.1.1 Overview
                    7.3.1.1.2 Definition of breakpoints
                         7.3.1.1.2.1 Definition of breakpoints for PSD shaping other than LESM
                         7.3.1.1.2.2 Definition of the breakpoints for the LESM
                              7.3.1.1.2.2.1 One-slope steep upward shape
                         7.3.1.1.2.3 Definition of breakpoints at the edge of a band
               7.3.1.2 Notching of specific frequency bands
               7.3.1.3 Carrier masking
               7.3.1.4 FDX masking
               7.3.1.5 Upstream power back-off (UPBO)
                    7.3.1.5.1 UPBO mechanism
                    7.3.1.5.2 UPBO PSD mask
                         7.3.1.5.2.1 Electrical length estimation
                         7.3.1.5.2.2 Computation of UPBOMASK
               7.3.1.6 LPM classes
          7.3.2 PSD and PSD mask summary
8 Transport protocol specific transmission convergence (TPS-TC) function
     8.1 Functional reference model
          8.1.1 γ reference point
          8.1.2 α reference point
          8.1.3 TPS-TC_MGMT interface
     8.2 Generic DTU format
          8.2.1 DTU header
               8.2.1.1 Sequence identifier (SID) field
               8.2.1.2 Time stamp (TS) field
               8.2.1.3 Auxiliary field
          8.2.2 DTU payload
          8.2.3 Error check sequence (ECS)
     8.3 Packet-based TPS-TC (PTM-TC)
          8.3.1 PTM-TC DTU format
     8.4 Network timing reference (NTR)
          8.4.1 NTR transport
               8.4.1.1 NTR frequency synchronization
     8.5 Time-of-day (ToD)
          8.5.1 Time-of-day distribution operational overview
          8.5.2 ToD frequency synchronization
               8.5.2.1 Computation of ToD phase difference
          8.5.3 ToD time synchronization
9 Physical media specific transmission convergence (PMS-TC) sub-layer
     9.1 Functional reference model
          9.1.1 δ reference point
          9.1.2 PMS-TC_MGMT interface
     9.2 DTU scrambler
     9.3 DTU encoder
     9.4 Interleaver
     9.5 Data frame multiplexer
     9.6 RMC and RRC
          9.6.1 RMC frame format
          9.6.2 RMC scrambler
          9.6.3 RMC encoder
          9.6.4 RMC message fields
          9.6.5 RRC frame format
          9.6.6 RRC scrambler
          9.6.7 RRC encoder
          9.6.8 RRC message fields
               9.6.8.1 The RRC-ACK
     9.7 Acknowledgement
          9.7.1 Acknowledgement via RMC
          9.7.2 Acknowledgement via RRC
     9.8 Retransmission function
          9.8.1 Acknowledgement and retransmission latency requirements
          9.8.2 Retransmission control parameters
               9.8.2.1 Primary parameters
               9.8.2.2 Valid configurations
               9.8.2.3 Mandatory configurations
               9.8.2.4 Derived parameters
          9.8.3 Performance related parameters
               9.8.3.1 Definition of mean time between error events (MTBE)
                    9.8.3.1.1 Definition of MTBE_min
                    9.8.3.1.2 Accelerated testing of MTBE
               9.8.3.2 Definition of signal-to-noise ratio margin (SNRM)
                    9.8.3.2.1 Accelerated testing of SNRM
                    9.8.3.2.2 SNRM_MODE = 1
               9.8.3.3 Impulse noise protection
               9.8.3.4 Definition of signal-to-noise ratio margin for RMC (SNRM_RMC)
10 Physical media dependent (PMD) function
     10.1 PMD functional reference model
          10.1.1 U reference point
          10.1.2 Multiplexing of paths at the MTU-O in P2MP mode
          10.1.3 PMD_MGMT interface
          10.1.4 Vectoring interfaces
     10.2 Symbol encoder
          10.2.1 Data symbol encoder
               10.2.1.1  Bytes to bits padding
               10.2.1.2 Symbol encoder with TCM
                    10.2.1.2.1 Tone ordering
                    10.2.1.2.2  Trellis encoding
                         10.2.1.2.2.1 Bit extraction
                              10.2.1.2.2.1.1 Data symbols
                              10.2.1.2.2.1.2 RMC symbols
                         10.2.1.2.2.2 Bit conversion
                    10.2.1.2.3 Constellation mapper
                         10.2.1.2.3.1 Bit extraction
                         10.2.1.2.3.2 Constellations
                              10.2.1.2.3.2.1 Even values of b
                              10.2.1.2.3.2.2 Odd values of b
               10.2.1.3 Symbol encoder with PCS-LCM
                    10.2.1.3.1 Overview
                    10.2.1.3.2 Tone Ordering
                    10.2.1.3.3 LDPC bit extractor
                         10.2.1.3.4 Amplitude encoder
                         10.2.1.3.4.1 Overview
                         10.2.1.3.4.2 Dispatcher
                         10.2.1.3.4.3 Shell mapper encoder
                              10.2.1.3.4.3.1 Overview
                              10.2.1.3.4.3.2 Weight calculation
                              10.2.1.3.4.3.3 Determine bit weights
                              10.2.1.3.4.3.4 Calculation of shell labels
                         10.2.1.3.4.4 Shell-to-amplitude mapper
                         10.2.1.3.4.5 Unshaped amplitude mapper
                    10.2.1.3.5 LDPC encoder
                         10.2.1.3.5.1 Generation of parity bits
                         10.2.1.3.5.2 Selection of LDPC parameters
                    10.2.1.3.6 Constellation mapper
               10.2.1.4 Constellation scaling
                    10.2.1.4.1 Power normalization
                    10.2.1.4.2 Gain adjuster
                    10.2.1.4.3 Frequency-domain transmit spectrum shaping (tssi)
                    10.2.1.4.4 Summary of the subcarrier modulation and constellation point scaling
               10.2.1.5 PRBS generator for unloaded subcarriers
               10.2.1.6 Quiet symbol encoding
               10.2.1.7 Idle symbol encoding
               10.2.1.8 RRC symbol encoding
          10.2.2 Symbol encoders for sync symbols, initialization symbols and concurrent monitoring symbols
               10.2.2.1 Sync symbol encoder
                    10.2.2.2 Initialization symbol encoder
                    10.2.2.2.1 Bit mapping of SOC symbols
                    10.2.2.2.2 Identification sequence (IDS) modulation
                    10.2.2.2.3 SOC symbol repetition
               10.2.2.3 Concurrent monitoring symbol encoder
               10.2.2.4 Preamble symbol encoder
               10.2.2.5 Quadrant scrambler
                    10.2.2.5.1  Reset mode
                    10.2.2.5.2  Free-running mode
     10.3 Precoder (downstream vectoring)
          10.3.1 Overview
          10.3.2 Vectoring feedback channel
               10.3.2.1 Definition of normalized error sample
               10.3.2.2 Definition of DFT output samples
               10.3.2.3 Reporting of vectoring feedback (VF) samples
                    10.3.2.3.1 Control parameters for vectoring feedback reporting
                    10.3.2.3.2 Grouping of VF samples
                         10.3.2.3.2.1 Grouping of VF samples in case of error samples reporting
                         10.3.2.3.2.2 Grouping of VF samples in case of DFT output sample reporting
                         10.3.2.3.2.3 Calculation of N_block
               10.3.2.4 Vectoring feedback channel format
                    10.3.2.4.1 Format of the VFRB
                    10.3.2.4.2 Format of the VF block
                    10.3.2.4.3 Vectoring feedback channel data rate (informative)
               10.3.2.5 Identification of the VFRB
                    10.3.2.5.1 Frequency identification control parameters
                    10.3.2.5.2 Time identification control parameters
     10.4 Modulation
          10.4.1 Data subcarriers
          10.4.2 Subcarrier spacing
          10.4.3 Inverse discrete Fourier transform (IDFT)
          10.4.4 Cyclic extension and windowing
          10.4.5 Synchronization
     10.5 PDX frame structure
          10.5.1 TDD framing mode
          10.5.2 FDXC framing mode
          10.5.3 FDXZ framing mode
               10.5.3.1 TDD fallback from FDXZ (TDDZ framing mode)
          10.5.5 RMC symbol position
          10.5.6 Data symbol positions
     10.6 Superframe structure
     10.7 Dynamic time frequency operation (DTFO)
          10.7.1 Normal and discontinuous operation intervals
               10.7.1.1 Operation in TDD mode
               10.7.1.2 Operation in FDX mode
          10.7.2 DTFO operation
          10.7.3 DTFO set-up and maintenance
               10.7.3.1 DTFO set-up during initialization
               10.7.3.2 DTFO maintenance during showtime
                    10.7.3.2.1 DTFO concurrent monitoring
                    10.7.3.2.2 DTFO sequential monitoring
                    10.7.3.2.3 Restoration of the DTFO
                         10.7.3.2.3.1 Restoration procedure initiated by the DRA
                         10.7.3.2.3.2 Restoration procedure initiated by the receiver
          10.7.4 Logical frame configuration
     10.8 Alignment of transmissions in vectored group
11 Operation and maintenance (OAM)
     11.1 OAM functional model
          11.1.1 γ_MGMT interface
     11.2 Management functions and procedures over eoc
          11.2.1 eoc transmission method
               11.2.1.1 eoc packet format
               11.2.1.2 eoc message format
               11.2.1.3 eoc transmission protocol
          11.2.2 eoc commands and responses
               11.2.2.1 General
               11.2.2.2 Command and response types
               11.2.2.3 Segmentation of eoc messages
               11.2.2.4 Transparent eoc commands and responses
                    11.2.2.4.1 Clear eoc commands and responses
                    11.2.2.4.2 Datagram eoc command
               11.2.2.5 OLR commands and responses
               11.2.2.6 Diagnostic commands and responses
                    11.2.2.6.1  Perform self-test
                    11.2.2.6.2  Update test parameters
                    11.2.2.6.3  Start/end RTX_TESTMODE
                    11.2.2.6.4  Start/end TPS_TESTMODE
               11.2.2.7 NTR frequency synchronization command
               11.2.2.8 ToD frequency synchronization command
               11.2.2.9 Time synchronization command and responses
               11.2.2.10 Inventory commands and responses
               11.2.2.11 Management counter read commands and responses
               11.2.2.12 L3 link state transition commands and responses
                    11.2.2.12.1 L3 Request by MTU-R
                    11.2.2.12.2 L3 Request by MTU-O
               11.2.2.13 PMD test parameter read commands and responses
               11.2.2.14 Vectoring feedback command and responses
               11.2.2.15 Probe sequence update commands and responses
               11.2.2.16 DRR configuration commands and responses
               11.2.2.17 Fast start-up training sequence parameters command and response
               11.2.2.18 Non-standard facility commands and responses
               11.2.2.19 INM facility commands and responses
               11.2.2.20 Update backup RTSBL
               11.2.2.21 SPA-PREP command and response
               11.2.2.22 The DBR-SD request eoc command and response
               11.2.2.23 The DBR-PR request eoc command and response
               11.2.2.24 SSA commands and responses
               11.2.2.25 DCM parameter update commands and responses
               11.2.2.26 The DBR-RMC eoc command and response
               11.2.2.27 Battery powered status
     11.3 OAM primitives
          11.3.1 Line-related primitives
               11.3.1.1 Near-end anomalies
               11.3.1.2 Far-end anomalies
               11.3.1.3 Near-end defects
               11.3.1.4 Far-end defects
               11.3.1.5 Initialization primitives
               11.3.1.6 Near-end OLR/FRA/RMCR primitives
               11.3.1.7 Far-end OLR/FRA/RMCR primitives
               11.3.1.8 Synchronous access network transient anomaly (SANTA)
          11.3.2 Path-related primitives
          11.3.3 Power-related primitives
               11.3.3.1 Near-end primitives
               11.3.3.2 Far-end primitives
          11.3.4 INM primitives
               11.3.4.1 Near-end primitives
               11.3.4.2 Far-end primitives
          11.3.5 P2MP operation
     11.4 P2P OAM parameters
          11.4.1 Test and status parameters
               11.4.1.1 Status parameters
                    11.4.1.1.1 Net data rate (NDR)
                    11.4.1.1.1.1 Net data rate with DTFO disabled (NDR0)
                    11.4.1.1.2 Attainable net data rate (ATTNDR)
                    11.4.1.1.3 Expected throughput (ETR)
                    11.4.1.1.3.1 Expected throughput with DTFO disabled (ETR0)
                    11.4.1.1.4 Attainable expected throughput (ATTETR)
                    11.4.1.1.5 Error-free throughput (EFTR) parameter
                    11.4.1.1.6 Minimum error-free throughput (EFTR_min) parameter
                    11.4.1.1.7 Actual INP against SHINE (INP_act_shine)
                    11.4.1.1.8 Actual INP against REIN (INP_act_rein)
                    11.4.1.1.9 Error-free bits counter
                    11.4.1.1.10 Signal-to-noise ratio margin parameter (SNRM)
                    11.4.1.1.11 Signal-to-noise ratio margin for the RMC (SNRM_RMC)
                    11.4.1.1.12 DTU FEC codeword size (NFEC)
                    11.4.1.1.13 DTU FEC redundancy (RFEC)
                    11.4.1.1.14 FEC codewords per DTU (Q)
                    11.4.1.1.15 Bit Allocation on data subcarriers
                    11.4.1.1.16 Bit Allocation on RMC subcarriers
                    11.4.1.1.17 All NOI and DOI with Data symbols EFTR with DTFO enabled (ANDEFTR) parameter
                         11.4.1.1.17.1 All NOI with Data symbols EFTR with DTFO disabled (ANDEFTR0) parameter
                    11.4.1.1.18 Minimum All NOI and DOI with Data symbols EFTR with DTFO enabled (ANDEFTR_min) parameter
                         11.4.1.1.18.1 Minimum All NOI with Data symbols EFTR with DTFO disabled (ANDEFTR0_min) parameter
                    11.4.1.1.19 Maximum All NOI and DOI with Data symbols EFTR with DTFO enabled (ANDEFTR_max) parameter
                         11.4.1.1.19.1 Maximum All NOI with Data symbols EFTR with DTFO disabled (ANDEFTR0_max) parameter
                    11.4.1.1.20 Sum All NOI and DOI with Data symbols EFTR with DTFO enabled (ANDEFTR_sum) parameter
                         11.4.1.1.20.1 Sum All NOI with Data symbols EFTR with DTFO disabled (ANDEFTR0_sum) parameter
                    11.4.1.1.21 All NOI and DOI with Data symbols EFTR with DTFO enabled defined second (ANDEFTRDS)
                         11.4.1.1.21.1 All NOI with Data symbols EFTR with DTFO disabled defined second (ANDEFTR0DS)
               11.4.1.2 Test parameters
                    11.4.1.2.1 Hlog per subcarrier (Hlog)
                    11.4.1.2.2 Signal-to-noise ratio per subcarrier (SNR)
                    11.4.1.2.3  Quiet line noise PSD per subcarrier group (QLN)
                    11.4.1.2.4  Active line noise PSD per subcarrier group (ALN)
                    11.4.1.2.5 Actual transmit PSD reference per subcarrier (ACTPSDREF)
                    11.4.1.2.6 Actual aggregate transmit power (ACTATP)
                    11.4.1.2.7 Signal attenuation (SATN)
                         11.4.1.2.7.1 Downstream signal attenuation (SATNds)
                         11.4.1.2.7.2 Upstream signal attenuation (SATNus)
                    11.4.1.2.8   Actual transmit PSD per subcarrier (ACTPSD)
                    11.4.1.2.9 FEXT downstream coupling coefficients (Xlogpsds)
                         11.4.1.2.9.1 Definition
                              11.4.1.2.9.1.1 FEXT coupling coefficient from line  into line
                              11.4.1.2.9.1.2 Direct channel insertion gain transfer function of line
                              11.4.1.2.9.1.3 FEXT insertion gain transfer function from line into line
                         11.4.1.2.9.2 Reporting of Xlogpsds
                    11.4.1.2.10 Average NEXT coupling (ANEXT)
                         11.4.1.2.10.1 Definition of NEXT insertion gain transfer function from line L2 into line L1
                         11.4.1.2.10.2 Definition of Average NEXT coupling from line L2 into line L1
                         11.4.1.2.10.3 Reporting of ANEXT
          11.4.2 Retransmission control parameters
               11.4.2.1 Minimum expected throughput (ETR_min)
               11.4.2.2 Maximum net data rate (NDR_max)
               11.4.2.3 Maximum delay (delay_max)
               11.4.2.4 Minimum impulse noise protection against SHINE (INP_min_shine)
               11.4.2.5 SHINEratio
               11.4.2.6 Minimum impulse noise protection against REIN (INP_min_rein)
               11.4.2.7 REIN Inter-arrival time for retransmission (iat_rein_flag)
               11.4.2.8 Minimum RFEC/NFEC ratio (rnratio_min)
          11.4.3 Vectoring control parameters
               11.4.3.1 FEXT cancellation enable/disable (FEXT_TO_CANCEL_ENABLE)
               11.4.3.2 Downstream requested Xlog subcarrier group size (XLOGGREQds)
               11.4.3.3 Requested Xlog disturber line (XTALKDREQ)
          11.4.4 Line performance monitoring parameters
               11.4.4.1 Errored second (ES)
               11.4.4.2 Severely errored second (SES)
               11.4.4.3 Los second (LOSS)
               11.4.4.4 Lor second (LORS)
               11.4.4.5 Unavailable second (UAS)
               11.4.4.6 Inhibiting performance monitoring parameters
               11.4.4.7 Impulse noise monitoring facility procedure and parameters
                    11.4.4.7.1 INM procedure
                    11.4.4.7.2  INM configuration parameters
                         11.4.4.7.2.1 Definition of parameter INMIATO
                         11.4.4.7.2.2 Definition of parameter INMIATS
                         11.4.4.7.2.3 Definition of parameter INMCC
                         11.4.4.7.2.4 Definition of parameter INM_INPEQ_FORMAT
                         11.4.4.7.2.5 Definition of parameter BRGN
                         11.4.4.7.2.6 Definition of parameter INPEQ scaling factor (INPEQ_SF)
                         11.4.4.7.2.7 Definition of parameter IAT scaling factor (IAT_SF)
                    11.4.4.7.3 INM reporting parameters and primitives
                         11.4.4.7.3.1 INM INPEQ histogram primitives
                         11.4.4.7.3.2 INM total measurement count primitive
                         11.4.4.7.3.3 INM inter-arrival time histogram primitives
                         11.4.4.7.3.4 INM blank logical frame count primitive
               11.4.4.8 Low ANDEFTR second (LANDEFTRS)
                    11.4.4.8.1 Low ANDEFTR0 second (LANDEFTR0S)
          11.4.5 Low power operation parameters
          11.4.6 Inventory parameters
               11.4.6.1 Vectoring specific inventory parameters
                    11.4.6.1.1 VCE ID (VCE_ID)
                    11.4.6.1.2 VCE port index (VCE_port_index)
               11.4.6.2 Inventory parameters for NT identification
                    11.4.6.2.1 NT Identity (NT_ID)
          11.4.7 Data path configuration parameters
               11.4.7.1 Mapping of Layer 2 queue to QoS channel
               11.4.7.2 QoS class
                    11.4.7.2.1. Priority (PRIORITY)
                    11.4.7.2.2. Target Maximum Delay (MAXDELAY)
                    11.4.7.2.3. Proactive Retransmission (PROACTIVE_RTX)
          11.4.8 FDX mask parameter
     11.5 P2MP OAM parameters
          11.5.1 P2MP group control parameters
               11.5.1.1  Maximum P2MP groupsize (p2mpgroupsize_max)
               11.5.1.2  Maximum P2MP group aggregate transmit power (p2mpgroupatp_max)
               11.5.1.3  Maximum P2MP group net data rate (p2mpgroupNDR_max)
          11.5.2 P2MP group status objects
               11.5.2.1  Actual P2MP groupsize (p2mpgroupsize_act)
               11.5.2.2 Actual P2MP group aggregate transmit power (p2mpgroupatp_act)
               11.5.2.3 Actual P2MP group net data rate (p2mpgroupNDR_act)
12 Link activation methods and procedures
     12.1 Overview
          12.1.1 Link states and link-state diagram
               12.1.1.1 Link-state diagram
               12.1.1.2 L3 – Idle state
               12.1.1.3 L0 – Normal operation state
               12.1.1.4 Transitions between link states
               12.1.1.5 Configuration and status reporting of the link state
                    12.1.1.5.1 Configuration of the Link state
                    12.1.1.5.2 Link state status reporting
          12.1.2 Transceiver states and transceiver state diagram
          12.1.3 Initialization procedures
          12.1.4 Deactivation, reinitialization, persistent link defects and high_BER events
               12.1.4.1 Deactivation
               12.1.4.2 Fast retrain
               12.1.4.3 Persistent link defects and high_BER events
                    12.1.4.3.1 Persistent near-end los defect
                    12.1.4.3.2 Persistent near-end lom defect
                    12.1.4.3.3 Persistent near-end lor defect
                    12.1.4.3.4 High_BER event
     12.2 Special operations channel (SOC)
          12.2.1 Message format
               12.2.1.1 Byte stuffing
          12.2.2 Communication protocol
               12.2.2.1 Automatic repeat (AR) mode
               12.2.2.2 Repeat request (RQ) mode
               12.2.2.3 Non-repeat (NR) mode
          12.2.3 SOC IDLE (O-IDLE, R-IDLE)
          12.2.4 SOC messages
               12.2.4.1 Message codes
               12.2.4.2 O/R-REPEAT_REQUEST
               12.2.4.3 O/R-ACK-SEG
               12.2.4.4 MTU-O and MTU-R messages
               12.2.4.5 Mapping of SOC data
               12.2.4.6 Segmentation of SOC messages
     12.3 Initialization procedure
          12.3.1 Overview
               12.3.1.1 Initialization procedure in a P2MP scenario
          12.3.2 ITU-T G.994.1 handshake phase
               12.3.2.1 Handshake – MTU-O
                    12.3.2.1.1 CL messages
                         12.3.2.1.1.1 Short CL messages
                    12.3.2.1.2 MS messages
               12.3.2.2 Handshake – MTU-R
                    12.3.2.2.1  CLR messages
                         12.3.2.2.1.1 Short CLR messages
                    12.3.2.2.2 MS messages
          12.3.3 Channel discovery phase
               12.3.3.1 Overview
                    12.3.3.1.1 O-VECTOR 1 stage
                    12.3.3.1.2 CHANNEL DISCOVERY 1-1 stage
                    12.3.3.1.3 CHANNEL DISCOVERY 1 stage
                    12.3.3.1.4 R-VECTOR 1 stage
                    12.3.3.1.5 EC TRAINING 1 stage
                    12.3.3.1.6 CHANNEL DISCOVERY 2 stage
                    12.3.3.1.7 R-VECTOR 1-1 stage
                    12.3.3.1.8 EC TRAINING 1-1 stage
                    12.3.3.1.9 VECTOR 2 stage
                    12.3.3.1.10 PARAMETER UPDATE stage
               12.3.3.2 SOC messages transmitted during channel discovery phase
                    12.3.3.2.1 O-SIGNATURE
                    12.3.3.2.2 O-TG-UPDATE
                    12.3.3.2.3 O-EC-PRM
                    12.3.3.2.4 R-EC-PRM
                    12.3.3.2.5 R-MSG 1
                    12.3.3.2.6 O-UPDATE
                    12.3.3.2.7 R-UPDATE
                    12.3.3.2.8 O-EC-PRM 1
                    12.3.3.2.9 R-EC-PRM 1
                    12.3.3.2.10 O-VECTOR-FEEDBACK
                    12.3.3.2.11 R-ACK
                    12.3.3.2.12 R-VECTOR-FEEDBACK
                    12.3.3.2.13 O-SNR
                    12.3.3.2.14 R-SNR
                    12.3.3.2.15 O-PRM
                    12.3.3.2.16 R-PRM
               12.3.3.3 Signals transmitted during channel discovery phase
                    12.3.3.3.1 Signals during QUIET 1 stage
                         12.3.3.3.1.1 O-P-QUIET 1
                         12.3.3.3.1.2 R-P-QUIET 1
                    12.3.3.3.2 Signals during O-VECTOR 1 stage
                         12.3.3.3.2.1 O-P-VECTOR 1
                         12.3.3.3.2.2 R-P-QUIET 1
                    12.3.3.3.3 Signals during CHANNEL DISCOVERY 1-1 stage
                         12.3.3.3.3.1 O-P-CHANNEL-DISCOVERY 1-1
                         12.3.3.3.3.2 O-P-SYNCHRO 1-1
                         12.3.3.3.3.3 R-P-QUIET 1
                    12.3.3.3.4 Signals during CHANNEL DISCOVERY 1 and R-VECTOR 1 stages
                         12.3.3.3.4.1 O-P-CHANNEL-DISCOVERY 1
                         12.3.3.3.4.2 R-P-VECTOR 1
                         12.3.3.3.4.3 O-P-SYNCHRO 1
                    12.3.3.3.5 Signals during EC TRAINING 1 stage
                         12.3.3.3.5.1 O-P-CHANNEL-DISCOVERY 1-2
                         12.3.3.3.5.2 O-P-SYNCHRO 1-2
                         12.3.3.3.5.3 O-P-EC 1 signal
                         12.3.3.3.5.4 O-P-CHANNEL-DISCOVERY 1-3
                         12.3.3.3.5.5 R-P-CHANNEL-DISCOVERY 1
                         12.3.3.3.5.6 R-P-QUIET 2
                         12.3.3.3.5.7 R-P-EC 1
                         12.3.3.3.5.8 O-P-SYNCHRO 1-3
                    12.3.3.3.6 Signals during CHANNEL DISCOVERY 2 stage
                         12.3.3.3.6.1 O-P-CHANNEL-DISCOVERY 2
                         12.3.3.3.6.2 R-P-CHANNEL-DISCOVERY 2
                         12.3.3.3.6.3 O-P-SYNCHRO 2
                    12.3.3.3.7 Signals during R-VECTOR 1-1 stage
                         12.3.3.3.7.1 O-P-VECTOR 1-1
                         12.3.3.3.7.2 R-P-VECTOR 1-1
                         12.3.3.3.7.3 O-P-SYNCHRO 3
                    12.3.3.3.8 Signals during EC TRAINING 1-1 stage
                         12.3.3.3.8.1 O-P-CHANNEL-DISCOVERY 2-1
                         12.3.3.3.8.2 O-P-SYNCHRO 3-00
                         12.3.3.3.8.3 O-P-EC 1-1 signal
                         12.3.3.3.8.4 O-P-CHANNEL-DISCOVERY 2-2
                         12.3.3.3.8.5 R-P-CHANNEL-DISCOVERY 2-1
                         12.3.3.3.8.6 R-P-QUIET 3
                         12.3.3.3.8.7 R-P-EC 1-1
                         12.3.3.3.8.8 O-P-SYNCHRO 3-01
                    12.3.3.3.9 Signals during VECTOR 2 stage
                         12.3.3.3.9.1 O-P-VECTOR 2
                         12.3.3.3.9.2 O-P-SYNCHRO 3-1
                         12.3.3.3.9.3 O-P-VECTOR 2-1
                         12.3.3.3.9.4 R-P-VECTOR 2
                         12.3.3.3.9.5 R-P-VECTOR 2-1
                         12.3.3.3.9.6 O-P-SYNCHRO 4
                    12.3.3.3.10 Signals during PARAMETER UPDATE stage
                         12.3.3.3.10.1 O-P-PRM-UPDATE 1
                         12.3.3.3.10.2 O-P-SYNCHRO 4-1
                         12.3.3.3.10.2 O-P-PRM-UPDATE 2
                         12.3.3.3.10.3 R-P-PRM-UPDATE 1
                         12.3.3.3.10.4 R-P-PRM-UPDATE 2
                         12.3.3.3.10.5 O-P-SYNCHRO 5
          12.3.4 – Channel Analysis and Exchange phase
               12.3.4.1 Overview
               12.3.4.2 SOC messages exchanged during channel analysis and exchange phase
                    12.3.4.2.1 O-MSG 1
                    12.3.4.2.2 R-MSG 2
                    12.3.4.2.3 O-TPS
                    12.3.4.2.4 R-ACK 1
                    12.3.4.2.5 O-PMS
                    12.3.4.2.6 R-PMS
                    12.3.4.2.7 O-PMD
                    12.3.4.2.8 R-PMD
                    12.3.4.2.9 R-ACK 2
               12.3.4.3 Signals transmitted during the channel analysis and exchange phase
                    12.3.4.3.1 O-P-MEDLEY
                    12.3.4.3.2 O-P-SYNCHRO 6
                    12.3.4.3.3 R-P-MEDLEY
          12.3.5  Transition to Showtime
               12.3.5.1 Establishment of DOI
          12.3.6 Alignment of initialization procedures of multiple joining lines (Informative)
               12.3.6.1 Joining group and waiting group (Informative)
               12.3.6.2 Alignment of the initialization procedures of multiple joining lines (Informative)
               12.3.6.3 Alignment of the parameters of multiple joining lines (Informative)
          12.3.7 Channel initialization policies
     12.4 NT identification and authentication in P2MP operation
13 On-line reconfiguration (OLR)
     13.1 Overview
          13.1.1 Types of online reconfiguration
          13.1.2 Types of bit-loading tables
          13.1.3 Summary of OLR types
     13.2 Eoc-based procedures
          13.2.1 Receiver initiated procedures
               13.2.1.1 SRA procedures
                    13.2.1.1.1 Parameters controlled by the SRA procedures
                         13.2.1.1.1.1 Parameters controlled by autonomous SRA in downstream
                         13.2.1.1.1.2 Parameters controlled by autonomous SRA in upstream
                    13.2.1.1.2 Parameters controlling the SRA procedures
                    13.2.1.1.3 SRA downshift procedure
                    13.2.1.1.4 SRA upshift procedure
                    13.2.1.1.5 Timing and synchronization for SRA
                    13.2.1.1.6 Retransmission of DTUs across SRA transitions
               13.2.1.2 Bit swapping procedure
                    13.2.1.2.1 Parameters controlled by bit swapping procedure
                    13.2.1.2.2 Bit swapping procedure
                    13.2.1.2.3 Timing and synchronization for bit swapping
               13.2.1.3 RPA procedure
                    13.2.1.3.1 Parameters controlling the RPA procedures
                    13.2.1.3.2 Parameters controlled by the RPA procedure
                    13.2.1.3.3 Timing and synchronization for RPA
               13.2.1.4 SPA procedure
                    13.2.1.4.1  SPA-PREP procedure
                         13.2.1.4.1.1 Parameters controlled by the SPA-PREP procedure
                    13.2.1.4.2  SPA-SRA procedure
                         13.2.1.4.2.1 Parameters controlled by the SPA-SRA procedure
                         13.2.1.4.2.2 Timing and synchronization for SPA-SRA
               13.2.1.5 Showtime reconfiguration
                    13.2.1.5.1 Scope
                    13.2.1.5.2 Overview
                         13.2.1.5.2.1 Reconfiguration of the line
                         13.2.1.5.2.2 Modification of configuration parameters
                    13.2.1.5.3 Showtime reconfiguration procedures
                         13.2.1.5.3.1 Local showtime reconfiguration (SREC-L) procedure
                         13.2.1.5.3.2 Remote showtime reconfiguration procedure
                         13.2.1.5.3.3 Transition time period
                    13.2.1.5.4 Management of the showtime reconfiguration protocol
                    13.2.1.5.5 Showtime reconfiguration request eoc commands
                    13.2.1.5.6 near-end anomalies
               13.2.1.6 SSA procedure
          13.2.2 Transmitter initiated procedures
               13.2.2.1 TIGA procedure
                    13.2.2.1.1 Parameters controlled by the TIGA procedure
                         13.2.2.1.1.1 Parameters controlled by the TIGA request
                         13.2.2.1.1.2 Parameters controlled by the TIGA response
                    13.2.2.1.2 Timing and synchronization for TIGA
     13.3 RMC-based procedures
          13.3.1 Receiver initiated procedures
               13.3.1.1 FRA procedure
                    13.3.1.1.1 Parameters controlling the FRA procedure
                         13.3.1.1.1.1 FRA time window (fra-time)
                         13.3.1.1.1.2 Minimum percentage of degraded tones (fra-ntones)
                         13.3.1.1.1.3 Minimum number of rtx-uc anomalies (fra-rtx-uc)
                         13.3.1.1.1.4 Vendor discretionary criteria (fra-vendisc)
                         13.3.1.1.1.5 FRA triggering criteria
                    13.3.1.1.2 Parameters controlled by the FRA procedure
                    13.3.1.1.3 Timing and synchronization for receiver initiated FRA
               13.3.1.2 RMCR procedure
                    13.3.1.2.1 RMCR triggering criteria
                    13.3.1.2.2 RMCR recovery criteria
                    13.3.1.2.3 Parameters controlling the RMCR procedure
                    13.3.1.2.4 Parameters controlled by the RMCR procedure
                    13.3.1.2.5 Timing and synchronization of RMCR
          13.3.2 Transmitter initiated procedures
               13.3.2.1 FRA procedures
     13.4 Low power operation
     13.5 DBR procedure
          13.5.1 Background
          13.5.2 Downstream DBR procedure
               13.5.2.1 The DBR procedure
               13.5.2.2 Auxiliary procedures related to downstream DBR
                    13.5.2.2.1 DBR-SD procedure
                    13.5.2.2.2 DBR-PR procedure
                    13.5.2.2.3 DBR-RMC procedure
                    13.5.2.2.4 Downstream post-DBR performance improvement stage
          13.5.3 Upstream DBR procedure
               13.5.3.1 The DBR procedure
               13.5.3.2 Auxiliary procedures related to upstream DBR
                    13.5.3.2.1 DBR-SD procedure
                    13.5.3.2.2 DBR-PR procedure
                    13.5.3.2.3 Upstream post-DBR performance improvement stage
     13.6 DCMU procedure
          13.6.1 Parameters controlled by the DCMU procedure
          13.6.2 Timing and synchronization for DCMU
14 Electrical requirements
     14.1 Balance
          14.1.1 Longitudinal conversion loss
          14.1.2 Common mode port impedance
     14.2 Differential port impedance
Annex A  Secure NT Identification and Authentication based on IEEE 802.1X
     A.1 Scope
     A.2 Abbreviations and acronyms
     A.3 Introduction
     A.4 References
     A.5 Reference model
     A.6 NT identification
          A.6.1 NT Identification based on UUID
          A.6.2 NT Identification based on certificate fingerprint
     A.7 NT Authentication
Annexes B and C
Annex D  Operation with dynamic time assignment
     D.1 Scope
     D.2 Definitions
     D.3 Abbreviations and acronyms
     D.4 Reference model(s)
     D.5 Dynamic time assignment (DTA)
          D.5.1 DTA-related primitives at the γO reference point
          D.5.2 The DTA procedure
          D.5.3 Valid values of Mds for DTA
          D.5.4 The PDX frame prior to and after a DTA update
               D.5.4.1 Performance during transitions
          D.5.5 Superframe structure for DTA
          D.5.6 Timing and synchronization for DTA
               D.5.6.1 General requirements to increase robustness
               D.5.6.2 Logical frame parameter in DTA
                    D.5.6.2.1 RMC content during one step procedure
          D.5.7 Transceiver related DTA control parameters
               D.5.7.1 DTA allowed (DTA_allowed)
               D.5.7.2 Minimum Mds for DTA (DTA_min_Mds)
               D.5.7.3 Maximum Mds for DTA (DTA_max_Mds)
               D.5.7.4 Maximum net data rate for DTA (DTA_NDR_max)
               D.5.7.5 Maximum net data rate (NDR_max)
               D.5.7.6 Minimum expected throughput (ETR_min)
          D.5.8 Transceiver related DTA status parameters
               D.5.8.1 Annex D operation enabled (Annex_D_enabled)
               D.5.8.2 Data rate reporting if DTA is enabled
                    D.5.8.2.1 Net data rate (NDR)
                    D.5.8.2.2 Attainable net data rate (ATTNDR)
                    D.5.8.2.3 Expected throughput (ETR)
                    D.5.8.2.4 Attainable expected throughput (ATTETR)
          D.5.9 Channel initialization policy for DTA
          D.5.10 High_BER event for DTA
          D.5.11 RMC commands
          D.5.12 eoc commands
               D.5.12.1 Update 'min used initial DTAFDC'
     D.6 Initialization messages
          D.6.1 Channel analysis and exchange phase
               D.6.1.1 O-MSG 1
               D.6.1.2 R-MSG 2
               D.6.1.3 O-PMS
Annexes E to O
Annex P  Adaptation to the twisted pair medium
     P.1 Scope
     P.2 Definitions
     P.3 Abbreviations and acronyms
     P.4 Reference models
     P.5 Profiles
          P.5.1 Profiles for operation over twisted pairs
          P.5.2 Profile compliance
Annex Q  Adaptation to the coaxial medium
     Q.1 Scope
     Q.2 Definitions
     Q.3 Abbreviations and acronyms
     Q.4 Reference models
     Q.5 Profiles
          Q.5.1 Profiles for operation over coaxial cables
          Q.5.2 Profile compliance
     Q.6 Discontinuous operation
     Q.7 Requirements specific to FDX mode
     Q.10 Adaptation to the coaxial cable medium
          Q.10.1 Application reference model
          Q.10.2 Termination impedance
          Q.10.3 Maximum aggregate transmit power
          Q.10.4 MDU coaxial cable configurations (informative)
Annex R
Annex S  NT software upgrade
     S.1 Scope
     S.2 References
     S.3 Reference model
     S.4 Software image management process
          S.4.1 Fundamental usage
               S.4.1.1 Software images attributes for fundamental usage
               S.4.1.2 Actions supporting the software upgrade process
          S.4.2 Vendor-specific usage
               S.4.2.1 File attributes for the vendor-specific usage
               S.4.2.2 Actions for vendor-specific usage and download process
          S.4.3 OAM data for software management
               S.4.3.1 Transaction correlation identifier
               S.4.3.2 Message type field
               S.4.3.3 Get software image and get software image response messages
     S.5 Message set
          S.5.1 Get software image
          S.5.2 Get software image response
          S.5.3 Start software download
          S.5.4 Start software download response
          S.5.5 Download section
          S.5.6 Download section response
          S.5.7 End software download
          S.5.8 End software download response
          S.5.9 Activate image
          S.5.10 Activate image response
          S.5.11 Commit image
          S.5.12 Commit image response
     S.6 Software upgrade (informative)
          S.6.1 Overview
          S.6.2 Software image download
          S.6.3 Software image activate and commit
Annex T  Dynamic time assignment (DTA) – higher-layer control aspects
     T.1 Scope
     T.2 DTA control parameters
          T.2.1 DTA allowed (DTA_allowed)
          T.2.2 Handshake Mds (hs_Mds)
          T.2.3 Preferred Mds for DTA (DTA_pref_Mds)
          T.2.4 Maximum step size for DTA changes (DTA_SMax)
          T.2.5 Minimum Mds for DTA (DTA_min_Mds)
          T.2.6 Maximum Mds for DTA (DTA_max_Mds)
          T.2.7 Minimum expected throughput for DTA (DTA_ETR_min)
          T.2.8 Maximum net data rate for DTA (DTA_NDR_max)
          T.2.9 Minimum time between DTA updates (DTA_Min_Time)
     T.3 Coordination between the link state request and the DTA request
Annexes U to W
Annex X  Operation without multi-line coordination intended for a  crosstalk-free environment
     X.1 Scope
     X.2 Definitions
     X.3 Abbreviations and acronyms
     X.4 Reference model(s)
     X.5 Profiles
          X.5.1 Profiles for operation over coaxial cables in a crosstalk-free environment
          X.5.2 Profiles for operation over twisted-pair cables in a crosstalk-free environment
          X.5.3 Profile compliance
     X.6 On-line reconfiguration
     X.7 Initialization
     X.8 Discontinuous operation
     X.9 Requirements specific to FDX mode
          X.9.1 In showtime
          X.9.2 In initialization
Annex Y   Upstream dynamic resource reports
Appendix I  Copper pair wiring topologies and reference loops
     I.1 Wiring topologies
     I.2 Reference loops
          I.2.1 The final drop
          I.2.2 In-premises wiring
          I.2.4 Wire types
          I.2.5 Examples of use cases
               I.2.5.1 FTTB example
                    I.2.5.1.1 FTTB with P2MP example
               I.2.5.2 FTTdp examples
               I.2.5.3 Single MTU-O (logical port) to multiple premises, P2MP example
          I.2.6 Loop sets for simulation and testing
Appendix II  Coaxial cable wiring topologies and reference loops
     II.1 Reference loops
     II.2 Wire types
Appendix III  Example OLR use cases
     III.1 Transmitter initiated gain adjustment (TIGA)
Bibliography