Rec. ITU-T G.9701 Amendment 1 (11/2019) Fast access to subscriber terminals (G.fast) – Physical layer specificationAmendment 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 Reference models and system requirements
5.1 System reference models
5.2 Application reference models
5.3 FTU protocol reference model
5.4 FTU functional model
5.5 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 Subcarrier masking
7.3.1.4 Upstream power back-off (UPBO)
7.3.1.4.1 UPBO mechanism
7.3.1.4.2 UPBO PSD mask
7.3.1.4.2.1 Electrical length estimation
7.3.1.4.2.2 Computation of UPBOMASK
7.3.1.5 LPM classes
7.3.2 PSD and PSD mask summary
7.4 Out-of-band PSD limit
7.5 Termination impedance
7.6 Maximum aggregate transmit power
7.6.1 Maximum aggregate transmit power
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
9.6.1 RMC frame format
9.6.2 RMC scrambler
9.6.3 RMC encoder
9.6.4 RMC message fields
9.7 Acknowledgement
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 interface
10.1.2 PMD_MGMT interface
10.1.2.1 Vectoring interfaces
10.2 Symbol encoder
10.2.1 Data symbol encoder
10.2.1.1 Bytes to bits padding
10.2.1.2 Tone ordering
10.2.1.3 Trellis coding
10.2.1.3.1 Bit extraction
10.2.1.3.1.1 Data symbols
10.2.1.3.1.2 RMC symbols
10.2.1.3.2 Bit conversion
10.2.1.3.3 Coset partitioning and trellis diagram (informative)
10.2.1.4 Constellation mapper
10.2.1.4.1 Bit extraction
10.2.1.4.2 Constellations
10.2.1.4.2.1 Even values of b
10.2.1.4.2.2 Odd values of b
10.2.1.5 Constellation point scaling
10.2.1.5.1 Power normalization
10.2.1.5.2 Gain adjuster
10.2.1.5.3 Frequency-domain transmit spectrum shaping (tssi)
10.2.1.5.4 Summary of the subcarrier constellation mapping and constellation point scaling
10.2.1.6 Quiet symbol encoding
10.2.1.7 Idle symbol encoding
10.2.2 Symbol encoders for sync symbols, initialization symbols and pilot 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 Pilot symbol encoder
10.2.2.4 Quadrant scrambler
10.2.2.4.1 Reset mode
10.2.2.4.2 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
10.4.5.1 Pilot symbols
10.5 TDD frame structure
10.5.1 RMC symbol position
10.5.2 Data symbol positions
10.6 Superframe structure
10.7 Normal and discontinuous operation intervals
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 FTU-R
11.2.2.12.2 L3 Request by FTU-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 L2 transition control
11.2.2.17 DRR configuration commands and responses
11.2.2.18 Fast startup training sequence parameters command and response
11.2.2.19 Non-standard facility commands and responses
11.2.2.20 INM facility commands and responses
11.2.2.21 Update backup RTSBL
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 primitives
11.3.1.7 Far-end OLR/FRA 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
11.4 OAM parameters
11.4.1 Test and status parameters
11.4.1.1 Status parameters
11.4.1.1.1 Net data rate (NDR)
11.4.1.1.2 Attainable net data rate (ATTNDR)
11.4.1.1.3 Expected throughput (ETR)
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 Net data rate in L2.1 (L2.1_NDR)
11.4.1.1.13 Net data rate in L2.2 (L2.2_NDR)
11.4.1.1.14 Expected throughput (L2.1_ETR)
11.4.1.1.15 Expected throughput (L2.2_ETR)
11.4.1.1.16 DTU FEC codeword size (NFEC)
11.4.1.1.17 DTU FEC redundancy (RFEC)
11.4.1.1.18 FEC codewords per DTU (Q)
11.4.1.1.19 Bit Allocation on data subcarriers (bi)
11.4.1.1.20 Bit Allocation on RMC subcarriers (bRMCi)
11.4.1.1.21 All NOI with Data symbols EFTR (ANDEFTR) parameter
11.4.1.1.22 Minimum All NOI with Data symbols EFTR (ANDEFTR_min) parameter
11.4.1.1.23 Maximum All NOI with Data symbols EFTR (ANDEFTR_max) parameter
11.4.1.1.24 Sum All NOI with Data symbols EFTR (ANDEFTR_sum) parameter
11.4.1.1.25 All NOI with Data symbols EFTR defined second (ANDEFTRDS)
11.4.1.2 Test parameters
11.4.1.2.1 Hlog-psg
11.4.1.2.2 Signal-to-noise ratio per subcarrier (SNR-ps)
11.4.1.2.3 Quiet line noise PSD per subcarrier group (QLN-psg)
11.4.1.2.4 Active line noise PSD per subcarrier group (ALN-psg)
11.4.1.2.5 Actual transmit PSD reference per subcarrier (ACTPSDREF-ps)
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 (SATN_DS)
11.4.1.2.7.2 Upstream signal attenuation (SATN_US)
11.4.1.2.8 Actual transmit PSD per subcarrier (ACTPSD-ps)
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 downstream FEXT coupling coefficients (Xlogpsds)
11.4.2 Retransmission configuration 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 configuration 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 Downstream requested Xlog disturber line (XLOGDREQds)
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)
11.4.5 Low power link state 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)
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 Low power link state L2.1
12.1.1.5 Low power link state L2.2
12.1.1.6 Transitions between link states
12.1.1.7 Configuration and status reporting of the link state
12.1.1.7.1 Link state forced
12.1.1.7.2 Link state enabling
12.1.1.7.3 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 FTU-O and FTU-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
12.3.2 ITU-T G.994.1 handshake phase
12.3.2.1 Handshake – FTU-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 – FTU-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 CHANNEL DISCOVERY 2 stage
12.3.3.1.6 R-VECTOR 1.1 stage
12.3.3.1.7 VECTOR 2 stage
12.3.3.1.8 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 R-MSG 1
12.3.3.2.4 O-UPDATE
12.3.3.2.5 R-UPDATE
12.3.3.2.6 O-VECTOR-FEEDBACK
12.3.3.2.7 R-ACK
12.3.3.2.8 R-VECTOR-FEEDBACK
12.3.3.2.9 O-SNR
12.3.3.2.10 R-SNR
12.3.3.2.11 O-PRM
12.3.3.2.12 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 stage
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 CHANNEL DISCOVERY 2 stage
12.3.3.3.5.1 O-P-CHANNEL-DISCOVERY 2
12.3.3.3.5.2 R-P-CHANNEL-DISCOVERY 2
12.3.3.3.5.3 O-P-SYNCHRO 2
12.3.3.3.6 Signals during R-VECTOR 1.1 stage
12.3.3.3.6.1 O-P-VECTOR 1-1
12.3.3.3.6.2 R-P-VECTOR 1-1
12.3.3.3.6.3 O-P-SYNCHRO 3
12.3.3.3.7 Signals during VECTOR 2 stage
12.3.3.3.7.1 O-P-VECTOR 2
12.3.3.3.7.2 O-P-VECTOR 2-1
12.3.3.3.7.3 R-P-VECTOR 2
12.3.3.3.7.4 R-P-VECTOR 2-1
12.3.3.3.7.5 O-P-SYNCHRO 3-1
12.3.3.3.7.6 O-P-SYNCHRO 4
12.3.3.3.8 Signals during PARAMETER UPDATE stage
12.3.3.3.8.1 O-P-PRM-UPDATE 1
12.3.3.3.8.2 O-P-PRM-UPDATE 2
12.3.3.3.8.3 R-P-PRM-UPDATE 1
12.3.3.3.8.4 R-P-PRM-UPDATE 2
12.3.3.3.8.5 O-P-SYNCHRO 4-1
12.3.3.3.8.6 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 O-ACK
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 Loop diagnostics mode
13 Online 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 L2TSA procedure
13.2.1.4.1 Parameters controlling the L2TSA procedures
13.2.1.4.2 Parameters controlled by the L2TSA procedure
13.2.1.4.3 Timing and synchronization for L2TSA
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
13.3.1.1.4 Aligning FRA with SRA and L2-TRNS
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 link states
13.4.1 Low power link state L2.1
13.4.1.1 L2.1 transmission format
13.4.1.2 L2.1 entry procedure
13.4.1.2.1 L2.1 entry policy
13.4.1.3 Operation during L2.1
13.4.1.3.1 L2.1 operation policy
13.4.1.3.2 L2.1 operation procedures
13.4.1.4 L2.1 exit procedure
13.4.1.4.1 Procedures at exit of L2.1
13.4.1.4.2 L2.1 exit policy
13.4.1.4.3 Procedures after entry into L0
13.4.1.4.4 Aligning L2.1 exit and TIGA
13.4.1.5 L2.1 control parameters
13.4.1.5.1 Minimum expected throughput in L2.1 (L2.1_ETR_min)
13.4.1.5.2 Maximum Net Data Rate in L2.1 (L2.1_NDR_max)
13.4.1.5.3 Target SNR margin in L2 (L2_TARSNRM)
13.4.1.5.4 Maximum SNR margin in L2.1 (L2.1_MAXSNRM)
13.4.1.5.5 Maximum PSD reduction in L2 (L2_PSDR_max)
13.4.1.5.6 Minimum expected ETR upon returning from the L2.1 link state to the L0 link state (L2.1_Exit_ETR_min)
13.4.1.5.7 Rate adaptation upshift & downshift SNR margin (L2.1_RA_USNRM & L2.1_RA_DSNRM)
13.4.1.5.8 Expected ETR upon returning from the L2.1 link state to the L0 link state (L2.1_Exit_ETR)
13.4.2 Low power link state L2.2
13.4.2.1 L2.2 transmission format
13.4.2.2 L2.2 Entry procedure
13.4.2.2.1 L2.2 entry policy
13.4.2.3 Operation during L2.2
13.4.2.3.1 L2.2 operation policy
13.4.2.3.2 L2.2 operation procedures
13.4.2.4 L2.2 Exit procedure
13.4.2.4.1 Procedures at exit of L2.2
13.4.2.4.2 L2.2 exit policy
13.4.2.5 L2.2 control parameters
13.4.2.5.1 Minimum expected throughput in L2.2 (L2.2_ETR_min)
13.4.2.5.2 Maximum Net Data Rate in L2.2 (L2.2_NDR_max)
13.4.3 Transition between L2.1N and L2.1B
13.4.4 Low power link state control parameters
13.4.4.1 Primary control parameters
13.4.4.2 Derived framing parameters
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 to Annex C
Annex D Operation with Dynamic Time Assignment in a crosstalk environment
D.1 Scope
D.2 Definitions
D.3 Abbreviations and acronyms
D.4 Reference model(s)
D.5 Coordinated Dynamic time assignment (cDTA)
D.5.1 cDTA-related primitives at the γO reference point
D.5.2 The cDTA procedure
D.5.3 Valid values of Mds for cDTA
D.5.4 The TDD frame prior to and after a cDTA update
D.5.4.1 Performance during transitions
D.5.5 Superframe structure for cDTA
D.5.6 Timing and synchronization for cDTA
D.5.6.1 One-step procedure
D.5.6.2 Two-step procedure
D.5.6.3 General requirements to increase robustness
D.5.6.4 Logical frame parameter in cDTA
D.5.7 Transceiver related cDTA control parameters
D.5.7.1 Annex D operation mode (Annex_D_mode)
D.5.7.2 cDTA allowed (cDTA_allowed)
D.5.7.3 Minimum Mds for DTA (DTA_min_Mds)
D.5.7.4 Maximum Mds for DTA (DTA_max_Mds)
D.5.7.5 Maximum net data rate for DTA (DTA_NDR_max)
D.5.7.6 Maximum net data rate (NDR_max)
D.5.7.7 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 cDTA procedure actual type (cDTA_proc_act)
D.5.8.3 Data rate reporting if cDTA is enabled
D.5.8.3.1 Net data rate (NDR)
D.5.8.3.2 Attainable net data rate (ATTNDR)
D.5.8.3.3 Expected throughput (ETR)
D.5.8.3.4 Attainable expected throughput (ATTETR)
D.5.9 Channel initialization policy for cDTA
D.5.10 High_BER event for cDTA
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 ITU-T G.994.1 Handshake phase
D.6.1.1 Handshake – FTU-O
D.6.1.1.1 CL messages
D.6.1.1.2 MS messages
D.6.1.2 Handshake – FTU-R
D.6.1.2.1 CLR messages
D.6.1.2.2 MS messages
D.6.2 Channel analysis and exchange phase
D.6.2.1 O-PMS
D.6.2.2 R-MSG 2
D.6.2.3 O-MSG 1
Annex E to Annex Q
Annex R Showtime reconfiguration
R.1 Scope
R.2 Overview
R.2.1 Reconfiguration of the line
R.2.2 Modification of configuration parameters
R.3 Showtime reconfiguration procedures
R.3.1 Local showtime reconfiguration (SREC-L) procedure
R.3.2 Remote showtime reconfiguration procedure
R.3.3 Transition time period
R.4 Management of the showtime reconfiguration protocol
R.5 Showtime reconfiguration request eoc commands
R.6 Near-end anomalies
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 Annex X operation mode (Annex_X_mode)
T.2.2 Annex D operation mode (Annex_D_mode)
T.2.3 iDTA allowed according to Annex X (iDTA_allowed)
T.2.4 cDTA allowed according to Annex D (cDTA_allowed)
T.2.5 Handshake Mds (hs_Mds)
T.2.6 Preferred Mds for DTA (DTA_pref_Mds)
T.2.7 Maximum step size for DTA changes (DTA_SMax)
T.2.8 Minimum Mds for DTA (DTA_min_Mds)
T.2.9 Maximum Mds for DTA (DTA_max_Mds)
T.2.10 Minimum expected throughput for DTA (DTA_ETR_min)
T.2.11 Maximum net data rate for DTA (DTA_NDR_max)
T.2.12 cDTA procedure control (cDTA_proc_ctrl)
T.2.13 Minimum time between DTA updates (DTA_Min_Time)
T.3 Coordination between the link state request and the DTA request
Annex U to Annex 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 Annex X profiles 106c and 212c 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 Independent dynamic time assignment (iDTA)
X.6.1 iDTA-related primitives at the γO reference point
X.6.2 The iDTA procedure
X.6.3 Valid values of Mds for DTA
X.6.4 The TDD frame prior to and after an iDTA update
X.6.4.1 Performance during transitions
X.6.5 Superframe structure for iDTA
X.6.6 Timing and synchronization for iDTA
X.6.7 Transceiver related iDTA control parameters
X.6.7.1 Annex X operation mode (Annex_X_mode)
X.6.7.2 iDTA allowed (iDTA_allowed)
X.6.7.3 Minimum Mds for DTA (DTA_min_Mds)
X.6.7.4 Maximum Mds for DTA (DTA_max_Mds)
X.6.7.5 Maximum net data rate for DTA (DTA_NDR_max)
X.6.7.6 Maximum net data rate (NDR_max)
X.6.7.7 Minimum expected throughput (ETR_min)
X.6.8 Transceiver related iDTA status parameters
X.6.8.1 Annex X operation enabled (Annex_X_enabled)
X.6.8.2 iDTA enabled (iDTA_enabled)
X.6.8.3 Data rate reporting if iDTA is enabled
X.6.8.3.1 Net data rate (NDR)
X.6.8.3.2 Attainable net data rate (ATTNDR)
X.6.8.3.3 Expected throughput (ETR)
X.6.8.3.4 Attainable expected throughput (ATTETR)
X.6.9 Channel initialization policy for iDTA
X.6.10 High_BER event for iDTA
X.6.11 RMC commands
X.7 Initialization messages
X.7.1 ITU-T G.994.1 Handshake phase
X.7.1.1 Handshake – FTU-O
X.7.1.1.1 CL messages
X.7.1.1.2 MS messages
X.7.1.2 Handshake – FTU-R
X.7.1.2.1 CLR messages
X.7.1.2.2 MS messages
X.7.2 Channel analysis and exchange phase
X.7.2.1 O-MSG 1
X.7.2.2 R-MSG 2
X.8 Discontinuous operation
X.9 On-line reconfiguration
X.10 Initialization
X.11 Low power states
X.12 Adaptation to the coaxial cable medium
X.12.1 Application reference model
X.12.2 Termination impedance
X.12.3 Maximum aggregate transmit power
X.12.4 MDU coaxial cable configurations (informative)
Annex Y Upstream dynamic resource reports
Annex Z Cross-layer traffic monitoring functions and link state control
Z.0 Introduction
Z.1 Definition of Terms
Z.2 Abbreviations and acronyms
Z.3 Reference models
Z.4 Generic traffic monitoring functions
Z.4.1 Traffic monitor function (TMF)
Z.4.2 DRRUSF
Z.5 Generic information flows
Z.5.1 Data flows
Z.5.1.1 The ( reference point
Z.5.2 Control Flows
Z.5.2.1 The O reference point
Z.5.2.2 The R reference point
Z.5.2.3 The (O reference point
Z.5.2.4 The (R reference point
Z.5.2.5 The γR reference point
Z.6 Link state specific functions
Z.6.1 LRCC-O function
Z.6.2 Triggers for link state change – Principles of operation
Z.6.2.1 Input information
Z.6.2.2 Traffic information processing
Z.6.2.2.1 Queue arrival processing
Z.6.2.2.2 Queue fill processing
Z.6.2.3 Trigger criteria – principles of operation
Z.6.2.3.1 Traffic-driven link state transitions
Z.6.2.3.2 Battery operation status driven link state transitions
Z.7 Link state management and reporting parameters
Appendix I Wiring topologies and reference loops
I.1 Wiring topologies
Figure I.1 – Modified star wiring topology
Figure I.2 – Distributed wiring topology
I.2 Reference loops
I.2.1 The final drop
Figure I.3 – Overview of the final drop
Figure I.4 – Primary final drop loop (D5)
I.2.2 In-premises wiring
Figure I.6 – Overview of the in-premises wiring
Figure I.7 – Illustration of in-premises loops
I.2.3 Reference combinations
Table I.3 – Reference combinations
I.2.4 Wire types
I.2.4.1 Cable model for wiring types B05a (CAD55), CAT5, T05u, T05b and T05h
Appendix II Example OLR use cases
II.1 Transmitter initiated gain adjustment (TIGA)
II.1.1 Flow chart
Appendix III Motivation of MTBE accelerated test
Appendix IV Targeted generalized vectoring with active ITU-T G.9701 supporting lines (TGVA)
IV.1 Scope
IV.2 Definitions
IV.3 Downstream TGVA (TGVAds) with active ITU-T G.9701 supporting lines
IV.3.1 Functional reference model for downstream
IV.3.2 Implementing TGVAds with active G.9701 supporting lines
IV.3.2.1 Initialization
IV.3.2.2 Showtime
IV.4 Upstream TGVA (TGVAus) with active ITU-T G.9701 supporting lines
IV.4.1 Functional reference model for upstream
IV.4.2 Implementing TGVAus with active ITU-T G.9701 supporting lines
Appendix V Retransmission buffer size and the achievable bit-rate
V.1 Case 1: NSYMret+NSYMack+1 ≤ Mus
V.2 Case 2: NSYMret+NSYMack+1≥Mus
V.3 Case 3: Lower bound for the achievable net data rate
V.4 Memory size example
Appendix VI Example applications of discontinuous operation
VI.1 Discontinuous operation with vectoring disabled
VI.2 Examples of discontinuous operation with vectoring enabled
Appendix VII Calculation of loop attenuation (LATN)
Appendix VIII Impulse noise monitoring – detection and interpretation of impulse noise using clusters of corrupted DTUs
VIII.1 Overview
VIII.2 Expected accuracy of impulse noise events
VIII.2.1 Case of small DTUs
VIII.2.2 Case of large DTUs
Appendix IX Examples of the cDTA procedure
IX.1 Mds is increased
IX.1.1 Example 1
IX.1.2 Example 2
IX.2 Mds is decreased
IX.2.1 Example 1
IX.2.2 Example 2
Bibliography