Rec. ITU-T G.993.2 (02/2019) - Very high speed digital subscriber line transceivers 2 (VDSL2)
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
4 Abbreviations and acronyms
5 Reference models
     5.1 VTU functional model
     5.2 User plane protocol reference model
     5.3 Management plane reference model
     5.4 Application reference models
          5.4.1 Data service
          5.4.2 Data with POTS service
          5.4.3 Data with ISDN service
6 Profiles
     6.1 Definition
     6.2 Profile parameter definitions
          6.2.1 Maximum aggregate downstream transmit power
          6.2.2 Minimum aggregate downstream transmit power
          6.2.3 Maximum aggregate upstream transmit power
          6.2.4 Minimum aggregate upstream transmit power
          6.2.5 Required subcarrier spacing
          6.2.6 Support of upstream band zero (US0)
          6.2.7 Required minimum bidirectional net data rate capability (MBDC)
          6.2.8 Aggregate interleaver and de-interleaver delay
          6.2.9 Index of the highest supported downstream data-bearing subcarrier
          6.2.10 Index of the highest supported upstream data-bearing subcarrier
          6.2.11 Maximum interleaving depth
          6.2.12 Parameter (1/S)max
     6.3 Profile compliance
7 Transmission medium interface characteristics
     7.1 Duplexing method and band plan construction
          7.1.1 Band plan below 12 MHz
          7.1.2 Band plan above 12 MHz
     7.2 Power spectral density (PSD)
          7.2.1 Transmit PSD mask
               7.2.1.1 MIB PSD mask construction
                    7.2.1.1.1 Overview
                    7.2.1.1.2 Definition of breakpoints above US0
                         7.2.1.1.2.1 Definition of breakpoints for PSDn that are greater than or equal to −80 dBm/Hz
                         7.2.1.1.2.2 Definition of breakpoints when some PSDn values are less than –80 dBm/Hz
                         7.2.1.1.2.3 Definition of the steep upward shape
                              7.2.1.1.2.3.1 One-slope steep upward shape
                              7.2.1.1.2.3.2 Two-slope steep upward shape
                         7.2.1.1.2.4 Definition of breakpoints at the edge of a band
                    7.2.1.1.3 Definition of breakpoints in US0
                         7.2.1.1.3.1 Restriction on breakpoints in US0
                         7.2.1.1.3.2 Derivation of US0 PSD mask from defined breakpoints
               7.2.1.2 Egress control
               7.2.1.3 Upstream power back-off (UPBO)
                    7.2.1.3.1 Power back-off mechanism
                    7.2.1.3.2 Power back-off PSD mask
                         7.2.1.3.2.1 Electrical length estimation method
                              7.2.1.3.2.1.1 The default electrical length estimation method (ELE-M0)
                              7.2.1.3.2.1.2 The alternative electrical length estimation method (ELE-M1)
                         7.2.1.3.2.2 UPBO mask
          7.2.2 Stopband PSD
          7.2.3 PSD and PSD mask summary
     7.3 Termination impedance
     7.4 Longitudinal conversion loss
8 Transport protocol specific transmission convergence (TPS-TC) function
     8.1 The user data TPS-TC
          8.1.1 User data TPS-TC types
          8.1.2 (/( interface specification
               8.1.2.1 Data flow
               8.1.2.2 Synchronization flow
               8.1.2.3 Control flow
          8.1.3 Control parameters
               8.1.3.1 Valid configurations
               8.1.3.2 Mandatory configurations
     8.2 Management TPS-TC (MPS-TC)
          8.2.1 Functional model
          8.2.2 Interface description
               8.2.2.1 ( interface
                    8.2.2.1.1 Data flow
                    8.2.2.1.2 Synchronization flow
                    8.2.2.1.3 Control flow
               8.2.2.2 (/( interface
          8.2.3 Encapsulation format
          8.2.4 Communication protocol
               8.2.4.1 Transmitter
               8.2.4.2 Receiver
     8.3 Network timing reference TPS-TC (NTR-TC)
          8.3.1 Interfaces
          8.3.2 Functionality
     8.4 Time-of-day TPS-TC (ToD-TC)
          8.4.1 Time-of-day distribution operational overview
          8.4.2 Interfaces
          8.4.3 Functionality
               8.4.3.1 Frequency Synchronization by locking PMD sampling clock with ToD frequency
               8.4.3.2 Frequency Synchronization using ToD phase difference values
               8.4.3.3 Time synchronization of real-time clocks
9 Physical media specific transmission convergence (PMS-TC) sublayer
     9.1 PMS-TC functional model
          9.1.1 δ interface
               9.1.1.1 Data flow
               9.1.1.2 Synchronization flow
               9.1.1.3 Control flow
     9.2 Scrambler
     9.3 Forward error correction
     9.4 Interleaving
          9.4.1 Dynamic change of interleaver depth
     9.5 Framing
          9.5.1 Mux data frame (MDF) and RS codewords
          9.5.2 Overhead (OH) frame, subframe and superframe
               9.5.2.1 OH subframe format
               9.5.2.2 Mapping of the OH data
                    9.5.2.2.1 Communication of ToD Frequency Synchronization Data via OH frame Type 1
               9.5.2.3 Cyclic redundancy check (CRC)
               9.5.2.4 OH superframe
          9.5.3 Multiplexing of data from two latency paths
               9.5.3.1 Robust overhead channel (ROC)
               9.5.3.2 Multiplexing
          9.5.4 Framing parameters
          9.5.5 Parameter 1/S
     9.6 Impulse noise protection (INPp)
     9.7 Delay
     9.8 Bit error ratio (BER)
     9.9 Delay variation
10 Physical media dependent (PMD) function
     10.1 PMD functional model
     10.2 DMT superframe
     10.3 Symbol encoder for data symbols
          10.3.1 Tone ordering
          10.3.2 Trellis encoder
               10.3.2.1 Bit extraction
               10.3.2.2 Bit conversion
               10.3.2.3 Coset partitioning and trellis diagram
          10.3.3 Constellation mapper
               10.3.3.1 Bit extraction
               10.3.3.2 Constellations
                    10.3.3.2.1  Even values of b
                    10.3.3.2.2  Odd values of b
                         10.3.3.2.2.1 b = 1
                         10.3.3.2.2.2 b = 3
                         10.3.3.2.2.3 b > 3
          10.3.4 Constellation point scaling
               10.3.4.1 Power normalization
               10.3.4.2 The gain adjuster
                    10.3.4.2.1  Nominal aggregate transmit power (NOMATP)
               10.3.4.3 Frequency-domain transmit spectrum shaping (tssi)
               10.3.4.4 Summary of subcarrier constellation mapping and constellation point scaling
     10.4 Modulation
          10.4.1 Data subcarriers
          10.4.2 Subcarrier spacing
          10.4.3 Modulation by the inverse discrete Fourier transform (IDFT)
          10.4.4 Cyclic extension and windowing
          10.4.5 Synchronization
               10.4.5.1 Pilot tones
               10.4.5.2 VTU-R timing
               10.4.5.3 Timing advance
               10.4.5.4 Synchronous mode
     10.5 Symbol encoder for sync symbol
          10.5.1 Constellation mapper for sync symbol
          10.5.2 Constellation point scaling for sync symbol
          10.5.3 On-line reconfiguration
     10.6 Symbol encoder for initialization
11 Operation and maintenance (OAM)
     11.1 OAM functional model
          11.1.1 OAM communication channels
               11.1.1.1 IB channel
               11.1.1.2 eoc
     11.2 VDSL2 management entity (VME)
          11.2.1 VME functionality
          11.2.2 eoc transmission protocol
          11.2.3 eoc commands and responses
               11.2.3.1 General
               11.2.3.2 Command and response types
               11.2.3.3 On-line reconfiguration (OLR) commands and responses
               11.2.3.4 Diagnostic commands and responses
                    11.2.3.4.1  Perform self-test
                    11.2.3.4.2  Update Test Parameters
                    11.2.3.4.3  Start/End transmitter Corrupt CRC
                    11.2.3.4.4 Start/End receiver Corrupt CRC
               11.2.3.5 Time commands and responses
               11.2.3.6 Inventory commands and responses
               11.2.3.7 Management counter read commands and responses
               11.2.3.8 Clear eoc commands and responses
               11.2.3.9 Power management commands and responses
                    11.2.3.9.1  L3 Request by VTU-R
                    11.2.3.9.2  L3 Request by VTU-O
               11.2.3.10  Non-standard facility commands and responses
               11.2.3.11 PMD Test Parameter Read commands and responses
               11.2.3.12 Control Parameter Read commands and responses
               11.2.3.13 INM facility commands and responses
               11.2.3.14  Frequency Synchronization command
               11.2.3.15 Time Synchronization command and responses
               11.2.3.16 Data gathering commands and responses
                    11.2.3.16.1 Data gathering configuration
                    11.2.3.16.2 Transfer of the VTU-R buffer from the VTU-R to the VTU-O
                    11.2.3.16.3 Write of the transferred VTU-R buffer to the CO-MIB
               11.2.3.17 SAVN-Update command and responses
          11.2.4 Indicator bits (IB)
     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 Near-end OLR primitives
               11.3.1.6 Far-end OLR primitives
          11.3.2 Path-related primitives
               11.3.2.1 Anomalies and defects for ATM transport
               11.3.2.2 Anomalies and defects for STM transport
               11.3.2.3 Anomalies and defects for PTM transport
          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 INM INPEQ histogram primitives
               11.3.4.2 INM total measurement primitive
               11.3.4.3 INM inter-arrival time histogram primitives
     11.4 OAM parameters
          11.4.1 Test parameters
               11.4.1.1 Definition of test parameters
                    11.4.1.1.1  Channel characteristics function per subcarrier group (CCF-ps)
                    11.4.1.1.2  Quiet line noise PSD per subcarrier group (QLN-ps)
                    11.4.1.1.3  Signal-to-noise ratio per subcarrier group (SNR-ps)
                    11.4.1.1.4  Loop attenuation per band (LATN-pb)
                    11.4.1.1.5  Signal attenuation per band (SATN-pb)
                    11.4.1.1.6  Signal-to-noise ratio margin
                         11.4.1.1.6.1 General definition of signal-to-noise ratio margin
                              11.4.1.1.6.1.1 SNRM_MODE = 1
                              11.4.1.1.6.1.2 SNRM_MODE = 2
                              11.4.1.1.6.1.3 SNRM_MODE = 3
                              11.4.1.1.6.1.4 SNRM_MODE = 4
                              11.4.1.1.6.1.5 SNRM_MODE = 5
                         11.4.1.1.6.2 Signal-to-noise ratio margin parameter (SNRM)
                         11.4.1.1.6.3 Signal-to-noise ratio margin per band (SNRM-pb)
                         11.4.1.1.6.4 Signal-to-noise ratio margin for the ROC (SNRM-ROC)
                    11.4.1.1.7  Attainable net data rate (ATTNDR)
                         11.4.1.1.7.1 The basic attainable net data rate method
                         11.4.1.1.7.2 The improved attainable net data rate method
                    11.4.1.1.8  Actual aggregate transmit power (ACTATP)
                    11.4.1.1.9 Actual impulse noise protection (INP_act)
                    11.4.1.1.10  Actual impulse noise protection of the ROC (INP_act-ROC)
               11.4.1.2 Accuracy of test parameters
                    11.4.1.2.1  Accuracy of channel characteristics function per subcarrier group (CCF-ps)
                         11.4.1.2.1.1 Accuracy of Hlog(k × G × Δf)
                         11.4.1.2.1.2 Accuracy of Hlin(k × G × Δf)
                    11.4.1.2.2  Accuracy of quiet line noise PSD per subcarrier group (QLN-ps)
                    11.4.1.2.3  Accuracy of signal-to-noise ratio per subcarrier group (SNR-ps)
                    11.4.1.2.4  Accuracy of loop attenuation per band (LATN-pb)
                    11.4.1.2.5  Accuracy of signal attenuation (SATN)
                    11.4.1.2.6  Accuracy of signal-to-noise ratio margin (SNRM)
                    11.4.1.2.7  Accuracy of attainable net data rate (ATTNDR)
                    11.4.1.2.8  Accuracy of actual aggregate transmit power (ACTATP)
          11.4.2 Configuration parameters
               11.4.2.1 Transmitter-referred virtual noise PSD
                    11.4.2.1.1  Definition of parameter TXREFVN
                    11.4.2.1.2  Use of parameter TXREFVN
               11.4.2.2 INM procedure and control parameters
                    11.4.2.2.1  INM procedure
                    11.4.2.2.2  Definition of parameter INMIATO
                    11.4.2.2.3  Definition of parameter INMIATS
                    11.4.2.2.4  Definition of parameter INMCC
                    11.4.2.2.5  Definition of parameter INM_INPEQ_MODE
                    11.4.2.2.6  Definition of parameter INM_INPEQ_FORMAT
               11.4.2.3 Receiver-referred virtual noise PSD
                    11.4.2.3.1  Definition of parameter RXREFVN
                    11.4.2.3.2  Use of parameter RXREFVN
               11.4.2.4 Receiver-referred virtual noise scaling factor
               11.4.2.5 Transmitter-referred virtual noise scaling factor
               11.4.2.6 Re-Initialization policy parameters
                    11.4.2.6.1  Re-Initialization policy selection (RIPOLICY)
                    11.4.2.6.2  REINIT_TIME_THRESHOLD
               11.4.2.7 MAXDELAYOCTET-split (MDOSPLIT)
               11.4.2.8 ATTNDR_MAXDELAYOCTET-split (ATTNDR_MDOSPLIT)
     11.5 Data gathering function
          11.5.1 Event types and event data
               11.5.1.1 Event type ''End of Showtime''
               11.5.1.2 Event type ''Previous End of Showtime''
               11.5.1.3 Event type ''Failed Init''
               11.5.1.4 Event type ''Successful Init''
               11.5.1.5 Event type ''Downstream Init Net Data Rate''
               11.5.1.6 Event type ''Upstream Init Net Data Rate''
               11.5.1.7 Event type ''Line Failure''
               11.5.1.8 Event type ''CRC-8 Anomalies''
               11.5.1.9 Event type ''OLR''
               11.5.1.10 Event type ''Bitswap''
               11.5.1.11 Event type ''Downstream Net Data Rate after Successful SRA''
               11.5.1.12 Event type ''Upstream Net Data Rate after Successful SRA''
               11.5.1.13 Event type ''Downstream Net Data Rate after Successful SOS''
               11.5.1.14 Event type ''Upstream Net Data Rate after Successful SOS''
               11.5.1.15 Event type ''Defect''
               11.5.1.16 Event type ''Retransmission Event''
          11.5.2 Buffer management rules
12 Link activation methods and procedures
     12.1 Overview
          12.1.1 Link states and link state diagram
          12.1.2 Transceiver states and transceiver state diagram
          12.1.3 Initialization procedures
          12.1.4 Deactivation, power loss, persistent link failure and high_BER events
          12.1.5 Loop diagnostic procedure
     12.2 Special operations channel (SOC)
          12.2.1 Message format
          12.2.2 Communication protocol
               12.2.2.1 Automatic repeat (AR) mode
               12.2.2.2 Repeat request (RQ) mode
          12.2.3 Mapping of SOC data
          12.2.4 SOC idle (O-IDLE, R-IDLE)
          12.2.5 SOC messages
               12.2.5.1 Message codes
               12.2.5.2 O/R-REPEAT_REQUEST
               12.2.5.3 O/R-ACK-SEG
               12.2.5.4 VTU-O and VTU-R messages
          12.2.6 Segmentation of messages
     12.3 Initialization procedure
          12.3.1 Overview
          12.3.2 ITU-T G.994.1 handshake phase
               12.3.2.1 Handshake – VTU-O
                    12.3.2.1.1  CL messages
                    12.3.2.1.2  MS messages
               12.3.2.2 Handshake – VTU-R
                    12.3.2.2.1  CLR messages
                    12.3.2.2.2  MS messages
          12.3.3 Channel discovery phase
               12.3.3.1 Overview
               12.3.3.2 SOC message exchange during the channel discovery phase
                    12.3.3.2.1  VTU-O messages sent during the channel discovery phase
                         12.3.3.2.1.1 O-SIGNATURE
                         12.3.3.2.1.2 O-UPDATE
                         12.3.3.2.1.3 O-PRM
                         12.3.3.2.1.4 O-ACK
                    12.3.3.2.2  VTU-R messages sent during the channel discovery phase
                         12.3.3.2.2.1 R-MSG 1
                         12.3.3.2.2.2 R-UPDATE
                         12.3.3.2.2.3 R-PRM
               12.3.3.3 Signals transmitted during the channel discovery phase
                    12.3.3.3.1  Signals transmitted by the VTU-O
                         12.3.3.3.1.1 O-P-QUIET 1
                         12.3.3.3.1.2 O-P-CHANNEL DISCOVERY 1
                         12.3.3.3.1.3 O-P-SYNCHRO 1
                         12.3.3.3.1.4 O-P-PILOT 1
                         12.3.3.3.1.5 O-P-QUIET 2
                         12.3.3.3.1.6 O-P-PERIODIC 1
                         12.3.3.3.1.7 O-P-SYNCHRO 2
                         12.3.3.3.1.8 O-P-CHANNEL DISCOVERY 2
                         12.3.3.3.1.9 O-P-SYNCHRO 3
                    12.3.3.3.2  Signals transmitted by the VTU-R
                         12.3.3.3.2.1 R-P-QUIET 1
                         12.3.3.3.2.2 R-P-CHANNEL DISCOVERY 1
                         12.3.3.3.2.3 R-P-SYNCHRO 1
                         12.3.3.3.2.4 R-P-LINEPROBE
                         12.3.3.3.2.5 R-P-PERIODIC 1
                         12.3.3.3.2.6 R-P-SYNCHRO 2
                         12.3.3.3.2.7 R-P-CHANNEL DISCOVERY 2
                         12.3.3.3.2.8 R-P-SYNCHRO 3
          12.3.4 Training phase
               12.3.4.1 Overview
               12.3.4.2 SOC message exchange during the training phase
                    12.3.4.2.1  VTU-O messages sent during the training phase
                         12.3.4.2.1.1 O-TA_UPDATE
                    12.3.4.2.2  VTU-R messages sent during the training phase
                         12.3.4.2.2.1 R-TA_UPDATE
                         12.3.4.2.2.2 R-ACK
               12.3.4.3 Signals transmitted during the training phase
                    12.3.4.3.1  Signals transmitted by the VTU-O
                         12.3.4.3.1.1 O-P-TRAINING 1
                         12.3.4.3.1.2 O-P-SYNCHRO 4
                         12.3.4.3.1.3 O-P-PILOT 2
                         12.3.4.3.1.4 O-P-TEQ
                         12.3.4.3.1.5 O-P-ECT
                         12.3.4.3.1.6 O-P-PILOT 3
                         12.3.4.3.1.7 O-P-PERIODIC 2
                         12.3.4.3.1.8 O-P-TRAINING 2
                         12.3.4.3.1.9 O-P-SYNCHRO 5
                    12.3.4.3.2  Signals transmitted by the VTU-R
                         12.3.4.3.2.1 R-P-QUIET 2
                         12.3.4.3.2.2 R-P-TRAINING 1
                         12.3.4.3.2.3 R-P-SYNCHRO 4
                         12.3.4.3.2.4 R-P-TEQ
                         12.3.4.3.2.5 R-P-QUIET 3
                         12.3.4.3.2.6 R-P-ECT
                         12.3.4.3.2.7 R-P-PERIODIC 2
                         12.3.4.3.2.8 R-P-TRAINING 2
                         12.3.4.3.2.9 R-P-SYNCHRO 5
          12.3.5 Channel analysis and exchange phase
               12.3.5.1 Overview
               12.3.5.2 SOC messages exchanged during channel analysis and exchange phase
                    12.3.5.2.1  VTU-O messages sent during the channel analysis and exchange phase
                         12.3.5.2.1.1 O-MSG 1
                         12.3.5.2.1.2 O-TPS
                         12.3.5.2.1.3 O-PMS
                         12.3.5.2.1.4 O-PMD
                    12.3.5.2.2  VTU-R messages sent during the channel analysis and exchange phase
                         12.3.5.2.2.1 R-MSG 2
                         12.3.5.2.2.2 R-TPS-ACK
                         12.3.5.2.2.3 R-PMS
                         12.3.5.2.2.4 R-PMD
               12.3.5.3 Signals transmitted during the channel analysis and exchange phase
                    12.3.5.3.1  Signals transmitted by the VTU-O
                         12.3.5.3.1.1 O-P-MEDLEY
                         12.3.5.3.1.2 O-P-SYNCHRO 6
                    12.3.5.3.2  Signals transmitted by the VTU-R
                         12.3.5.3.2.1 R-P-MEDLEY
                         12.3.5.3.2.2 R-P-SYNCHRO 6
          12.3.6 General initialization signal requirements
               12.3.6.1 Periodic signal requirements
               12.3.6.2 Quadrant scrambler
                    12.3.6.2.1  Reset mode
                    12.3.6.2.2  Free-running mode
          12.3.7 Channel initialization policies
               12.3.7.1 Channel initialization policies with ROC
     12.4 Loop diagnostic mode procedures
          12.4.1 Overview
               12.4.1.1 SOC message mapping during loop diagnostic mode
          12.4.2 Channel discovery and training phases of loop diagnostic mode
               12.4.2.1 SOC messages exchanged during the channel discovery and training phases of loop diagnostic mode
                    12.4.2.1.1  VTU-O message O-PRM-LD
                    12.4.2.1.2  VTU-R message R-PRM-LD
               12.4.2.2 Signals transmitted during the channel discovery and training phases
          12.4.3 Channel analysis and exchange phase of loop diagnostic mode
               12.4.3.1 SOC messages exchanged during the channel analysis and exchange phase of loop diagnostic mode
                    12.4.3.1.1  VTU-O messages
                    12.4.3.1.2  VTU-R messages
               12.4.3.2  Signals transmitted during the channel analysis and exchange phase of loop diagnostic mode
                    12.4.3.2.1  O-P-TRAINING 3
                    12.4.3.2.2  R-P-TRAINING 3
     12.5 Fast start-up
13 On-line reconfiguration (OLR)
     13.1 Types of on-line reconfiguration
     13.2 Control parameters
          13.2.1 Control parameters controlled by the OLR procedures
          13.2.2 Parameters controlling the OLR procedures
     13.3 Timing of changes in subcarrier configuration
     13.4 Receiver initiated procedure
          13.4.1 Receiver Initiated SRA downshift procedure
          13.4.2 Receiver initiated SRA upshift procedure
          13.4.3 Receiver initiated SOS
               13.4.3.1 SOS triggering parameters
                    13.4.3.1.1  SOS time Window (SOS-TIME)
                    13.4.3.1.2  Minimum Percentage of Degraded Tones (SOS-NTONES)
                    13.4.3.1.3  Minimum Number of normalized CRC anomalies (SOS-CRC)
               13.4.3.2 Standard SOS triggering criteria
               13.4.3.3 Generic requirements for receiver initiated SOS
          13.4.4 Receiver Initiated SRA following an SOS procedure
14 Electrical requirements
     14.1 Termination impedance model
     14.2 Service splitters
Annex A  Region A (North America)
     A.1 Band plan
     A.2 Limit PSD masks
          A.2.1 VTU-R Limit PSD masks
               A.2.1.1 VTU-R operation over POTS
               A.2.1.2 VTU-R All-digital mode operation
          A.2.2 VTU-O Limit PSD masks
     A.3 UPBO reference PSDs
Annex B  Region B (Europe)
     B.1 Band plans
     B.2 Limit PSD mask options
          B.2.1 General requirements in the band below 4 kHz
          B.2.2 VTU-R Limit PSD masks for band plan 997 (and its extensions)
          B.2.3 VTU-O Limit PSD masks for band plans 997 (and its extensions)
          B.2.4 VTU-R limit PSD masks for band plan 998 (and its extensions)
          B.2.5 VTU-O Limit PSD masks for band plan 998 (and its extensions)
     B.3 UPBO reference PSDs
     B.4 Template PSD
          B.4.1 Definition
          B.4.2 Narrow-band PSD verification
          B.4.3 Use in simulation (Informative)
     B.5 Compliance
Annex C  Region C (Japan)
     C.1 Band plan
     C.2 Limit PSD masks
          C.2.1 VDSL2 system operating at frequencies above the POTS band
          C.2.2 VDSL2 system operating at frequencies above the TCM-ISDN DSL band
     C.3 VDSL2 system with PSD reduction at frequencies below DPBOFMAX
     C.4 Upstream power back-off (UPBO) PSD masks
     C.5 Service Splitter
     C.6 Test loops and crosstalk disturbers
          C.6.1 Test loops
               C.6.1.1 Loop configurations
               C.6.1.2 Primary line constants
               C.6.1.3 Line transfer function and test loop characteristics
          C.6.2 Crosstalk disturbers
               C.6.2.1 Disturber types
               C.6.2.2 Power spectral density of disturbers
               C.6.2.3 Power spectral density of crosstalk
Annex D  Long Reach VDSL2
     D.1 Introduction
     D.2 Overview of the initialization procedure
     D.3 ITU-T G.994.1 handshake phase
     D.4 Signals sent by the VTU-O during the channel discovery phase
     D.5 Signals sent by the VTU-R during the channel discovery phase
     D.6 O/R-P-PROBING-LR signal exchange
     D.7 O/R-P-TRAINING-LR signal exchange
          D.7.1 O-P-PILOT-LR (replaces clause B.7.1.14 of ITU-T G.993.5)
     D.8 ITU-T G.993.2 channel discovery phase and training phase in long loop operation
          D.8.1 ITU-T G.993.2 channel discovery phase in long loop operation
               D.8.1.1 Transition to ITU-T G.993.2 channel discovery phase
               D.8.1.2 Use of PILOT during R-P-LINEPROBE
               D.8.1.3 O-SIGNATURE (amends clause 12.3.3.2.1.1 of ITU-T G.993.2)
               D.8.1.4 PSD adjustments during ITU-T G.993.2 channel discovery phase
          D.8.2 ITU-T G.993.2 training phase in long loop operation
     D.9 Definition of Limit PSD masks
     D.10 Management
     D.11 Nominal aggregate transmit power (NOMATP)
Annex E
Annex F
Annex G
Annex H
Annex J
Annex K
Annex L  TPS-TC functional descriptions
     L.1 STM transmission convergence (STM-TC) function
          L.1.1 Scope
          L.1.2 References
          L.1.3 Definitions
          L.1.4 Abbreviations
          L.1.5 Transport capabilities
          L.1.6 Interface primitives
          L.1.7 Control parameters
               L.1.7.1 Valid configurations
               L.1.7.2 Mandatory configurations
          L.1.8 Data plane procedures
          L.1.9 Management plane procedures
               L.1.9.1 Surveillance primitives
               L.1.9.2 Indicator bits
               L.1.9.3 Overhead command formats
                    L.1.9.3.1 Inventory command
                    L.1.9.3.2 Control value read command
                    L.1.9.3.3 Management Counter Read command
          L.1.10 Initialization procedure
          L.1.11 On-line reconfiguration
               L.1.11.1 Changes to an existing stream
     L.2 ATM transmission convergence (ATM-TC) function
          L.2.1 Scope
          L.2.2 References
          L.2.3 Definitions
          L.2.4 Abbreviations
          L.2.5 Transport capabilities
               L.2.5.1 Additional functions
          L.2.6 Interface primitives
          L.2.7 Control parameters
               L.2.7.1 Valid configurations
               L.2.7.2 Mandatory configurations
          L.2.8 Data plane procedures
               L.2.8.1 Block diagram
               L.2.8.2 Rate matching by idle cell insertion
               L.2.8.3 HEC octet
               L.2.8.4 Cell delineation
               L.2.8.5 ATM cell error detection
               L.2.8.6 Scrambler
          L.2.9 Management plane procedures
               L.2.9.1 Surveillance primitives
               L.2.9.2 Indicator bits
               L.2.9.3 Overhead command formats
                    L.2.9.3.1 Inventory command
                    L.2.9.3.2 Control Value Read command
                    L.2.9.3.3 Management Counter Read command
          L.2.10 Initialization procedure
          L.2.11 On-line reconfiguration
               L.2.11.1 Changes to an existing stream
     L.3 Packet transmission convergence function (PTM-TC)
          L.3.1 Scope
          L.3.2 References
          L.3.3 Definitions
          L.3.4 Abbreviations
          L.3.5 Transport capabilities
          L.3.6 Interface primitives
          L.3.7 Control parameters
               L.3.7.1 Valid configuration
               L.3.7.2 Mandatory configurations
          L.3.8 Functionality
          L.3.9 Management plane procedures
               L.3.9.1 Surveillance primitives
               L.3.9.2 Indicator bits
               L.3.9.3 Overhead command formats
                    L.3.9.3.1 Inventory command
                    L.3.9.3.2 Control Value Read command
                    L.3.9.3.3 Management Counter Read command
          L.3.10 Initialization procedure
          L.3.11 On-line reconfiguration
               L.3.11.1 Changes to an existing stream
Annex M  Time-of-day distribution over VDSL2 links
     M.1 Time-of-day distribution operational overview
     M.2 Definitions
     M.3 Abbreviations
     M.4 VTU functional model
     M.5 TPS-TC function
     M.6 eoc communication protocol
     M.7 ToD TPS-TC (ToD-TC)
     M.8 Mapping of OH data
     M.9 eoc transmission protocol
     M.10 Frequency synchronization command
          M.10.1 The eoc data rate to transport the ToD phase difference values (informative)
     M.11 Time synchronization command and responses
     M.12 Updates to initialization
Annex N  Region D (China)
     N.1 Band plans
     N.2 Limit PSD mask options
          N.2.1 General requirements in the band below 4 kHz
          N.2.2 VTU-R limit PSD masks for band plans CN17 and C35
          N.2.3 VTU-O limit PSD masks for band plans CN17 and CN35
     N.3 UPBO reference PSDs
     N.4 Template PSD
          N.4.1 Definition
          N.4.2 Narrow-band PSD verification
          N.4.3 Use in simulation (informative)
     N.5 Compliance
Annex O
Annex P  Short reach VDSL2 with reduced power and enhanced data rate
     P.1 Scope
     P.2 Reduced ATP
     P.3 Minimum bidirectional net data rate capability
     P.4 ITU-T G.998.4 Annex D support for enhanced net data rates with ITU-T G.998.4
     P.5 SRA support
     P.6 TPS-TC
Annex Q  Enhanced data rate 35 MHz VDSL2 with 4.3125 kHz subcarrier spacing
     Q.1 Scope
     Q.2 Capabilities related to the profile
     Q.3 ITU-T G.998.4 Annex D support for enhanced net data rates
     Q.4 SRA support
     Q.5 TPS-TC
     Q.6 Additional changes to ITU-T G.993.2 for operation according to profile 35b
Annex R
Annex S
Annex T
Annex U
Annex V
Annex W
Annex X  ITU-T G.993.5-friendly ITU-T G.993.2 operation in the downstream direction
     X.1 Power management commands and responses (clause 11.2.3.9)
          X.1.1 L3 Request by VTU-R (replaces clause 11.2.3.9.1)
          X.1.2 L3 Request by VTU-O (replaces clause 11.2.3.9.2)
     X.2 Initialization procedure (supplements clause 12.3)
          X.2.1 ITU-T G.994.1 handshake phase
               X.2.1.1 Handshake – VTU-O
                    X.2.1.1.1 CL messages (supplements clause 12.3.2.1.1)
                    X.2.1.1.2 MS messages (supplements clause 12.3.2.1.2)
               X.2.1.2 Handshake – VTU-R
                    X.2.1.2.1 CLR messages (supplements clause 12.3.2.2.1)
                    X.2.1.2.2 MS messages (supplements clause 12.3.2.2.2)
          X.2.2 Channel discovery phase
               X.2.2.1  Overview (supplements clause 12.3.3.1)
                    X.2.2.1.1  SOC message exchange during the channel discovery phase (supplements clause 12.3.3.2)
                         X.2.2.1.1.1 VTU-O messages sent during the channel discovery phase (supplements clause 12.3.3.2.1)
                              X.2.2.1.1.1.1 O-SIGNATURE (supplements clause 12.3.3.2.1.1)
               X.2.2.2 Signals transmitted during the channel discovery phase (supplements clause 12.3.3.3)
                    X.2.2.2.1 Signals transmitted by the VTU-O
                         X.2.2.2.1.1 O-P-VECTOR 1-1 (supplements clause 12.3.4.3.1 preceding clause 12.3.3.3.1.1)
                         X.2.2.2.1.2 O-P-VECTOR 1 (supplements clause 12.3.3.3.1 between clauses 12.3.3.3.1.1 and 12.3.3.3.1.2)
                         X.2.2.2.1.3 O-P-SYNCHRO 3 (replaces clause 12.3.3.3.1.9)
          X.2.3 Training phase
               X.2.3.1  Overview (supplements clause 12.3.4.1)
               X.2.3.2 Signals transmitted during the training phase (supplements clause 12.3.4.3)
                    X.2.3.2.1 Signals transmitted by the VTU-O
Annex Y  Full ITU-T G.993.5-friendly ITU-T G.993.2 operation
     Y.1 Initialization procedure (supplements clause 12.3)
          Y.1.1 ITU-T G.994.1 handshake phase
               Y.1.1.1 Handshake – VTU-O
                    Y.1.1.1.1 CL messages (supplements clause 12.3.2.1.1 of ITU-T G.993.2)
                    Y.1.1.1.2 MS messages (supplements clause 12.3.2.1.2 of ITU-T G.993.2)
               Y.1.1.2 Handshake – VTU-R
                    Y.1.1.2.1 CLR messages (supplements clause 12.3.2.2.1 of ITU-T G.993.2)
                    Y.1.1.2.2 MS messages (supplements clause 12.3.2.2.2 of ITU-T G.993.2)
     Y.2 R-MSG1 (supplements clause 10.3.2.2 of [ITU-T G.993.5])
     Y.3 O-TA_UPDATE (supplements clause 10.4.2.1 of [ITU-T G.993.5])
     Y.4 R-P-VECTOR 2 (replaces clause 10.4.4.5 of [ITU-T G.993.5])
     Y.5 O-PMS (supplements clause 10.5.2.1 of [ITU-T G.993.5])
     Y.6 eoc messages for backchannel configuration (replaces clause 8.1 of [ITU-T G.993.5])
     Y.7 Loop diagnostic mode procedures (replaces clause 12.4)
Appendix I  Example values of DPBO parameters to protect ADSL2plus for clause C.3
     I.1 Example PSD parameters
     I.2 Example Cable parameters
     I.3 Example frequency parameters
Appendix II  Impact of loop and VTU impedance mismatch on the Hlog accuracy
Bibliography