1
Scope
1.1 System reference model
1.2 Objectives
2
References
3
Definitions
4
Abbreviations
5
Reference Models
5.1 ATU‑C transmitter reference models
5.1.1 ATU‑C transmitter reference model
for STM transport
5.1.2 ATU‑C transmitter reference model
for ATM transport
5.2 ATU‑R transmitter reference models
5.2.1 ATU‑R transmitter reference model
for STM transport
5.2.2 ATU‑R transmitter reference model
for ATM transport
5.3 ATU‑C/R transmitter timing model (Annex C only)
6
Transport capacity
6.1 Transport of STM data
6.2 Transport of ATM data
6.3 ADSL system overheads and total bit rates
7
ATU‑C functional characteristics
7.1 STM Transmission Protocol Specific functionalities
7.1.1 ATU‑C input and output V interfaces
for STM transport
7.1.2 Downstream simplex
channels bit rates
7.1.3 Downstream/upstream duplex
channels bit rates
7.1.4 Payload transfer delay
7.1.5 Framing Structure for STM transport
7.2 ATM Transport Protocol Specific functionalities
7.2.1 ATU‑C input and output V interface
for ATM transport
7.2.2 Payload transfer delay
7.2.3 ATM Cell specific functionalities
7.2.4 Framing
Structure for ATM transport
7.3 Network timing reference (NTR)
7.3.1 Need for NTR
7.3.2 Transport of the NTR
7.4 Framing
7.4.1 Data symbols
7.4.2
Synchronization
7.4.3 Reduced overhead framing
7.5 Scramblers
7.6 Forward error correction
7.6.1 Reed-Solomon coding
7.6.2 Reed-Solomon Forward Error Correction
Superframe Synchronization
7.6.3 Interleaving
7.6.4 Support of higher downstream bit rates
with S= 1/2 (optional)
7.7 Tone ordering
7.8 Constellation encoder (trellis code version)
7.8.1 Bit extraction
7.8.2 Bit conversion
7.8.3 Coset partition and trellis diagram
7.8.4 Constellation encoder
7.9 Constellation encoder No trellis coding
7.9.1 Bit extraction
7.9.2 Constellation encoder
7.10 Gain scaling
7.11 Modulation
7.11.1 Subcarriers
7.11.2 Modulation by the inverse discrete
Fourier transform (IDFT)
7.11.3 Synchronization symbol
7.11.4 Inverse synchronization symbol (Annex C
only)
7.12 Cyclic prefix
7.13 Transmitter dynamic range
7.13.1 Maximum clipping rate
7.13.2 Noise/distortion floor
7.14 ATU‑C Downstream Transmitter spectral masks
7.15 Dual Bitmapping and Rate Conversion (Annex C only)
7.16 FEXT Bitmapping (Annex C only)
8
ATU‑R Functional
Characteristics
8.1 STM Transmission Protocol Specific functionalities
8.1.1 ATU‑R input and output T interfaces
for STM transport
8.1.2 Downstream simplex
channels Transceiver bit rates
8.1.3 Duplex channels Transceiver
bit rates
8.1.4 Framing Structure for STM transport
8.2 ATM Transport Protocol Specific functionalities
8.2.1 ATU‑R input and output T interfaces
for ATM transport
8.2.2 ATM Cell specific functionalities
8.2.3 Framing Structure for ATM transport
8.3 Network timing reference
8.4 Framing
8.4.1 Data symbols
8.4.2 Synchronization
8.4.3 Reduced overhead framing
8.5 Scramblers
8.6 Forward error correction
8.7 Tone ordering
8.8 Constellation encoder Trellis version
8.9 Constellation encoder Uncoded version
8.10 Gain scaling
8.11 Modulation
8.11.1 Subcarriers
8.11.2 Modulation by the inverse discrete
Fourier transform
8.11.3 Synchronization symbol
8.11.4 Inverse synchronization symbol (Annex C
only)
8.12 Cyclic prefix
8.13 Transmitter dynamic range
8.13.1 Maximum clipping rate
8.13.2 Noise/distortion floor
8.14 ATU‑R Upstream Transmitter spectral response
8.15 Dual Bitmapping and Rate Conversion (Annex C only)
8.16 FEXT Bitmapping (Annex C only)
9
EOC Operations and Maintenance
9.1 Clear EOC
9.2 Embedded operations channel (EOC) requirements
9.2.1 EOC organization and protocol
9.2.2 EOC message structure
9.2.3 EOC message sets
9.2.4 Data registers in the ATU‑R
9.2.5 EOC protocol states
9.3 In-service performance monitoring and surveillance
9.3.1 ADSL line related primitives
9.3.2 STM data path related primitives
9.3.3 ATM
data path related primitives
9.3.4 Other ADSL indicators, parameters and
signals
9.4 Failures and Performance Parameters
9.5 Test Parameters
9.5.1 Near‑end test parameters
9.5.2 Far‑end test parameters
10 Initialization
10.1 Overview
10.1.1 Basic functions of initialization
10.1.2 Transparency to methods of separating
upstream and downstream signals
10.1.3 Implementation of service options for
ADSL
10.1.4 Resetting during initialization and data
transmission
10.1.5 Initialization with Hyperframe (Annex C
only)
10.2 Handshake ATU‑C
10.2.1 CL messages
10.2.2 MS messages
10.3 Handshake ATU‑R
10.3.1 CLR messages
10.3.2 MS messages
10.4 Transceiver training ATU‑C
10.4.1 C-QUIET2
10.4.2 C-PILOT1
10.4.3 C‑PILOT1A
10.4.4. C-QUIET3A
10.4.5 C-REVERB1
10.4.6 C-PILOT2
10.4.7 C-ECT
10.4.8 C-REVERB2
10.4.9 C-QUIET5
10.4.10 C-PILOT3
10.4.11 C-REVERB3
10.5 Transceiver training ATU-R
10.5.1 R-QUIET2
10.5.2 R‑REVERB1
10.5.3 R‑QUIET3
10.5.4 R‑ECT
10.5.5 R‑REVERB2
10.6 Channel analysis (ATU‑C)
10.6.1 C‑SEGUE1
10.6.2 C‑RATES1
10.6.3 C‑CRC1
10.6.4 C‑MSG1
10.6.5 C‑CRC2
10.6.6 C‑MEDLEY
10.7 Channel analysis (ATU‑R)
10.7.1 R‑SEGUE1
10.7.2 R‑REVERB3
10.7.3 R‑SEGUE2
10.7.4 R‑RATES1
10.7.5 R‑CRC1
10.7.6 R‑MSG1
10.7.7 R‑CRC2
10.7.8 R‑MEDLEY
10.7.9 R‑REVERB4
10.8 Exchange ATU‑C
10.8.1 C‑REVERB4
10.8.2 C-SEGUE2
10.8.3 C-RATES-RA
10.8.4 C-CRC-RA1
10.8.5 C-MSG-RA
10.8.6 C-CRC-RA2
10.8.7
C-REVERB‑RA
10.8.8 C-SEGUE-RA
10.8.9 C‑MSG2
10.8.10 C‑CRC3
10.8.11 C‑RATES2
10.8.12 C‑CRC4
10.8.13 C‑B&G
10.8.14 C‑CRC5
10.8.15 C‑REVERB5
10.8.16 C‑SEGUE3
10.9 Exchange ATU‑R
10.9.1 R‑SEGUE3
10.9.2 R-MSG-RA
10.9.3 R-CRC-RA1
10.9.4 R-RATES-RA
10.9.5 R-CRC-RA2
10.9.6 R-REVERB-RA
10.9.7 R-SEGUE-RA
10.9.8 R‑MSG2
10.9.9 R‑CRC3
10.9.10 R‑RATES2
10.9.11 R‑CRC4
10.9.12 R‑REVERB5
10.9.13 R‑SEGUE4
10.9.14 R‑B&G
10.9.15 R‑CRC5
10.9.16 R‑REVERB6
10.9.17 R‑SEGUE5
10.9.18 Details of Initialization timing
11 AOC on-line adaptation and reconfiguration
11.1 The ADSL overhead control (AOC)
channel
11.1.1 AOC message header
11.1.2 AOC protocol
11.2 On-line adaptation Bit swapping
11.2.1 Bit swap channel
11.2.2 Superframe counting
11.2.3 Bit swap request
11.2.4 Extended bit swap request
11.2.5 Bit swap acknowledge
11.2.6 Bit swap Receiver
11.2.7 Bit
swap Transmitter
Annex A Specific requirements for an ADSL system
operating in the frequency band above
POTS
A.1 ATU‑C Functional
Characteristics (pertains to clause 7)
A.1.1 Pilot Frequency (supplements 7.11.1.2)
A.1.2 ATU‑C downstream transmit spectral mask (replaces 7.14)
A.1.3 ATU‑C transmitter PSD mask for reduced NEXT
A.2 ATU‑R (see clause 8)
A.2.1 Modulation by the inverse discrete Fourier transform (see 8.11.2)
A.2.2 Synchronization symbol (supplements 8.11.3)
A.2.3 Cyclic prefix (replaces 8.12)
A.2.4 ATU‑R transmitter spectral mask (replaces 8.14)
A.2.5 Nyquist frequency (supplements 8.11.1.2)
A.3 Initialization (see clause 10)
A.3.1 Power cut-back (supplements 10.4.5.1)
A.3.2 Estimated average upstream loop attenuation (see 10.8.9.1)
A.3.3 Estimated average downstream loop attenuation (supplements 10.9.8.1)
A.3.4 C‑PILOT1 (supplements 10.4.2)
A.3.5 R‑REVERB1 (see 10.5.2)
A.3.6 C‑ECT (see 10.4.7)
A.3.7 R‑ECT (see 10.5.4)
A.3.8 C‑MSG2 (supplements 10.8.9)
A.3.9 R‑MSG2 (supplements 10.9.8)
A.4 Electrical characteristics (new)
A.4.1 DC characteristics
A.4.2 Voiceband characteristics
A.4.3 ADSL band characteristics
Annex B Specific requirements for an ADSL system
operating in the frequency band above ISDN as defined in ITU-T Recommendation
G.961 Appendices I and II
B.1 ATU Functional Characteristics
(see clause 7)
B.1.1 Data Subcarriers (see 7.11.1.1)
B.1.2 Pilot Frequency (see 7.11.1.2)
B.1.3 Downstream transmit spectral mask (replaces 7.14)
B.2 ATU‑R functional
characteristics (see clause 8)
B.2.1 ATU‑R transmit reference models
B.2.2 ATU‑R Upstream transmit spectral mask (replaces 8.14)
B.2.3 Data subcarriers (replaces 8.11.1.1)
B.2.4 Pilot frequency
B.2.5 Nyquist frequency (supplements 8.11.1.2)
B.2.6 Modulation by the Inverse Discrete Fourier Transform (replaces 8.11.2)
B.2.7 Synchronization symbol (supplements 8.11.3)
B.2.8 Cyclic prefix (replaces 8.12)
B.3 Initialization (see clause 10)
B.3.1 Handshake ATU-C (supplements 10.2)
B.3.2 Handshake ATU-R (supplements 10.3)
B.3.3 Power Cut-back (supplements 10.4.5.1)
B.3.4 Estimated average upstream loop attenuation (see 10.8.9.1)
B.3.5 Estimated average downstream loop attenuation (10.9.8.1)
B.3.6 C‑PILOT1 (for 10.4.3)
B.3.7 R‑REVERB1 (supplements 10.5.2)
B.3.8 R‑MEDLEY (replaces 10.7.8)
B.3.9 C‑MSG2 (supplements 10.8.9)
B.3.10 R‑MSG2 (supplements 10.9.8)
B.3.11 C‑ECT and R‑ECT (supplements 10.4.7 and 10.5.4)
B.3.12 C‑B&G (replaces 10.8.13)
Annex C Specific requirements for an ADSL system
operating in the same cable as ISDN as
defined in ITU-T Recommendation G.961 Appendix III
C.1 Scope
C.2 Definitions
C.3 Reference Models
C.3.1 ATU‑C transmitter reference model (replaces figures in 5.1)
C.3.2 ATU‑R transmitter reference model (replaces figures in 5.2)
C.3.3 ATU‑C/R transmitter timing model (replacement for 5.3)
C.4 ATU‑C functional
characteristics (pertains to clause 7)
C.4.1 STM transmission protocols specific functionality (pertains to 7.1)
C.4.2 ATM transmission protocols specific functionalities (pertains to 7.2)
C.4.3 Framing (pertains to 7.4)
C.4.4 Dual Bitmapping and Rate Conversion (replaces 7.15)
C.4.5 FEXT Bitmapping (replaces 7.16)
C.4.6 Tone Ordering (replacement for 7.7)
C.4.7 Modulation (pertains to 7.11)
C.4.8 ATU‑C Downstream transmit spectral mask (replaces 7.14)
C.5 ATU‑R Functional
Characteristics (pertains to clause 8)
C.5.1 Framing (pertains to 8.4)
C.5.2 Dual Bitmapping and rate conversion (replaces 8.15)
C.5.3 FEXT Bitmapping (replaces 8.16)
C.5.4 Tone Ordering (pertains to 8.7)
C.5.5 Modulation (pertains to 8.11)
C.5.6 ATU‑R Upstream Transmit Spectral Mask (supplements 8.14)
C.6 EOC Operation and Maintenance
(pertains to clause 9)
C.6.1 ADSL line related primitives (supplements 9.3.1)
C.6.2 Test Parameters (supplements 9.5)
C.7 Initialization
C.7.1 Initialization with Hyperframe (replaces 10.1.5)
C.7.2 Handshake ATU-C (supplements 10.2)
C.7.3 Handshake ATU-R (supplements 10.3)
C.7.4 Transceiver Training ATU‑C (supplements 10.4)
C.7.5 Transceiver Training ATU‑R (supplements 10.5)
C.7.6 Channel analysis (ATU‑C)
(supplements 10.6)
C.7.7 Channel analysis (ATU‑R)
(supplements 10.7)
C.7.8
R‑SEGUE1 (supplements 10.7.1)
C.7.9 Exchange ATU‑C
(supplements 10.8)
C.7.10
Exchange ATU‑R (supplements 10.9)
C.8 AOC On-line adaptation and
reconfiguration (pertains to clause 11)
Annex D ATU‑C and ATU‑R state diagrams
D.1 Introduction
D.2 Definitions
D.3 State Diagrams
Annex E POTS and ISDN-BA splitters
E.1 Type 1 European
E.1.1 Impedance matching
E.1.2 Return loss
E.1.3 Insertion loss
E.1.4 Insertion loss distortion
E.1.5 Isolation
E.1.6 Signal power
E.1.7 Ringing
E.1.8 Unbalance about Earth (ETS-300.001, § 4.2.1 and § 4.2.2)
E.1.9 Frequencies and levels for pulse metering (ETS-300.001, § 1.7.8)
E.2 Type 2 North America
E.2.1 Introduction
E.2.2 DC characteristics
E.2.3 Voiceband characteristics
E.2.4 ADSL band testing
E.2.5 Home premises physical considerations
E.3 Type 3 ADSL above ISDN
(ITU-T G.961 Appendix I or II)
E.4 Type 4 Type for Japan
E.4.1 Introduction
E.4.2 DC Characteristics
E.4.3 AC Characteristics
Annex F ATU‑x Classification and Performance
for Region A (North
America)
F.1 Classification definitions
F.2 Performance requirements
F.2.1 Crosstalk interference
F.2.2 Impulse noise
F.2.3 POTS
Annex G ATU‑x Classification and Performance
for Region B (Europe)
G.1 Performance requirements
Appendix I ATM Layer to Physical Layer Logical Interface
Appendix II Dynamic (on-line) Rate Adaptation
II.1 Introduction
II.1.1 General concepts
II.2 DRA protocol and messages
II.2.1 DRA concept
II.2.2 DRA-AOC messages
II.3 Monitoring
II.3.1 DRA_Monitor_Request
II.3.2 DRA_Monitor_Reply
II.4 Configuration
II.4.1 DRA_Configuration_Request
II.4.2 DRA_Configuration_Reply
II.5 Exchange
II.5.1 DRA_Exchange_Request
II.5.2 DRA_Exchange_Reply
II.6 Swap
II.6.1 Example
II.6.2 DRA_Swap_Request
II.6.3 DRA_Swap_Reply
II.7 DRA state diagram
II.7.1 State machine conventions
II.7.2 ATU‑R state machine
II.7.3 ATU‑C state machine
Appendix III Compatibility with other customer
premises equipment
Appendix IV Bibliography