Recommendation ITU-T G.994.1 (02/2021) Handshake procedures for digital subscriber line transceivers
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
4 Abbreviations and acronyms
5 System reference diagram
6 Signals and modulation
     6.1 Description of signals
          6.1.1 4.3125 kHz signalling family
          6.1.2 4 kHz signalling family
     6.2 Modulation
     6.3 Transmit filter characteristics
          6.3.1 4.3125 kHz signalling family
          6.3.2 4 kHz signalling family
7 Description of messages
     7.1 CL – Capabilities list
     7.2 CLR – Capabilities list + request
     7.3 MR – Mode request
     7.4 MS – Mode select
     7.5 MP – Mode proposal
     7.6 ACK(1) – Acknowledgement, type 1
     7.7 ACK(2) – Acknowledgement, type 2
     7.8 NAK-EF – Negative Acknowledgement, errored frame
     7.9 NAK-NR – Negative Acknowledgement, not ready
     7.10 NAK-NS – Negative Acknowledgement, not supported
     7.11 NAK-CD – Negative Acknowledgement, cleardown
     7.12 REQ-MS – Request MS message
     7.13 REQ-MR – Request MR message
     7.14 REQ-CLR – Request CLR message
     7.15 REQ-RTX – Retransmission message
8 Structure of messages
     8.1 Format convention
     8.2 Frame structure
     8.3 Frame check sequence field
     8.4 Octet transparency
     8.5 Inter-frame time fill
9 Message coding format
     9.1 General
     9.2 Coding format for parameters in the I and S fields
          9.2.1 Parameter classification
          9.2.2 Order of transmission of parameters
          9.2.3 Delimiting and parsing of parameter blocks
     9.3 Identification field (I)
          9.3.1 Message type field
          9.3.2 Version number field
          9.3.3 Additional information field
               9.3.3.1 Vendor ID information block
               9.3.3.2 Retransmission information block
          9.3.4 Parameter field
     9.4 Standard information field (S)
          9.4.1 ITU-T G.992.1 Annex A Par(2)/Par(3) parameters
          9.4.2 ITU-T G.992.1 Annex B Par(2)/Par(3) parameters
          9.4.3 ITU-T G.992.1 Annex C Par(2)/Par(3) parameters
          9.4.4 ITU-T G.992.2 Annexes A/B Par(2)/Par(3) parameters
          9.4.5 ITU-T G.992.2 Annex C Par(2)/Par(3) parameters
          9.4.6 ITU-T G.992.1 Annex H Par(2)/Par(3) parameters
          9.4.7 ITU-T G.992.1 Annex I Par(2)/Par(3) parameters
          9.4.8 ITU-T G.991.2 Annexes A/F Par(2)/Par(3) parameters
          9.4.9 ITU-T G.991.2 Annexes B/G Par(2)/Par(3) parameters
          9.4.10
          9.4.11
          9.4.12 ETSI MCM VDSL Par(2)/Par(3) parameters
          9.4.13
          9.4.14
          9.4.15 ITU-T G.992.3 Annexes A/L Par(2)/Par(3) parameters
          9.4.16 ITU-T G.992.3 Annex B Par(2)/Par(3) parameters
          9.4.17 ITU-T G.992.3 Annex I Par(2)/Par(3) parameters
          9.4.18 ITU-T G.992.3 Annex J Par(2)/Par(3) parameters
          9.4.19 ITU-T G.992.4 Annex A Par(2)/Par(3) parameters
          9.4.20 ITU-T G.992.4 Annex I Par(2)/Par(3) parameters
          9.4.21 ITU-T G.992.3 Annex C Par(2)/Par(3) parameters
          9.4.22 ITU-T G.992.5 Annex A Par(2)/Par(3) parameters
          9.4.23 ITU-T G.992.5 Annex B Par(2)/Par(3) parameters
          9.4.24 ITU-T G.992.5 Annex I Par(2)/Par(3) parameters
          9.4.25 ITU-T G.992.3 Annex M Par(2)/Par(3) parameters
          9.4.26 ITU-T G.992.5 Annex J Par(2)/Par(3) parameters
          9.4.27
          9.4.28
          9.4.29 ITU-T G.992.5 Annex M Par(2)/Par(3) parameters
          9.4.30 ITU-T G.993.1 Par(2)/Par(3) parameters
          9.4.31 ITU-T G.993.1 Annex I Par(2)/Par(3) parameters
          9.4.32 ITU-T G.991.2 variable silence period Par(2)/Par(3) parameters
          9.4.33 ITU-T G.992.5 Annex C Par(2)/Par(3) parameters
          9.4.34 ITU-T G.993.2 Par(2)/Par(3) parameters
          9.4.35 ITU-T G.9701 Par(2)/Par(3) parameters
          9.4.36 ITU-T G.9711 Par(2)/Par(3) parameters
     9.5 Non-standard information field (NS)
     9.6 Overall message composition
10 ITU-T G.994.1 transactions
     10.1 Basic transactions
          10.1.1 Transaction A
          10.1.2 Transaction B
          10.1.3 Transaction C
          10.1.4 Transaction D
     10.2 Extended transactions
          10.2.1 Transaction A:B
          10.2.2 Transaction B:A
          10.2.3 Transaction A:C
          10.2.4 Transaction B:C
          10.2.5 Transaction D:C
     10.3 Message segmentation
     10.4 State transition diagrams
     10.5 Retransmission transactions
          10.5.1 Transaction RA
          10.5.2 Transaction RB
11 Start-up/cleardown procedures
     11.1 Duplex start-up procedures
          11.1.1 HSTU-R initiated start-up procedure
          11.1.2 HSTU-C initiated start-up procedure
     11.2 Half-duplex start-up procedures
          11.2.1 HSTU-R initiated start-up procedure
          11.2.2 HSTU-C initiated start-up procedure
     11.3 Cleardown procedure
12 Error recovery procedures
13 Downstream maximum PSD control parameters
     13.1 GHS A43 carrier set maximum PSD level in downstream
     13.2 GHS A43c and B43C carrier set maximum PSD level in downstream
     13.3 GHS B43 and J43 carrier set maximum PSD level in downstream
     13.4 GHS V43 carrier set maximum PSD level in downstream
     13.5 GHS individual carrier maximum PSD level in downstream
Annex A  Support for legacy non-ITU-T G.994.1 devices
Annex B  Operation over multiple wire pairs
Annex C  An operating mode for use in the same cable as TCM-ISDN
     C.1 Scope (supplements clause 1)
     C.2 Signals and modulation (pertains to clause 6)
          C.2.1 Description of signals (modifies clause 6.1)
               C.2.1.1 Signalling family (replaces clause 6.1.1)
          C.2.2 Modulation (replaces clause 6.2)
     C.3 Start-up/cleardown procedures (pertains to clause 11)
          C.3.1 Start-up procedures (new)
               C.3.1.1 HSTU-R initiated start-up procedure (new)
               C.3.1.2 HSTU-C initiated start-up procedure (new)
          C.3.2 Interoperability procedure (new)
Annex D   Collision control protocol for point-to-multipoint (P2MP) operation
     D.1 Scope
     D.2 Definitions
     D.3 Abbreviations and acronyms
     D.4 Overview
     D.5 Collision control session
          D.5.1 Collision resolution procedure at the HSTU-R
               D.5.1.1 Checking the line for the presence of an ITU-T G.994.1 session
               D.5.1.2 Sending the R-CC-FLAG
               D.5.1.3 Detection of C-P2MP
               D.5.1.4 Collision detection
               D.5.1.5 Detection of the C-PTRN
          D.5.2 Collision control procedure at HSTU-C
               D.5.2.1 HSTU-C support of P2MP
               D.5.2.2 Detection of R-P2MP-REQ
               D.5.2.3 Sending of C-P2MP
               D.5.2.4 Detection of R-CC-FLAG
               D.5.2.5 Sending of C-PTRN
          D.5.3 Operation options and timelines
     D.6 Signals for collision control protocol
          D.6.1 Carrier frequencies specific to the collision control protocol
          D.6.2 The HSTU-R signals
          D.6.3 The HSTU-C signals
     D.7 Management
          D.7.1 P2MP mode enabled (P2MP_enabled)
Annexes E to L
Annex M   Managed objects
     M.1 Scope
     M.2 Configuration objects
          M.2.1 Downstream maximum PSD (MAXHSPSDds)
          M.2.2 P2MP mode enabled (P2MP_ENABLED)
Appendix I  ITU-T G.994.1 sample sessions
Appendix II  Provider code contact information
Appendix III  Support for legacy DMT-based devices
Appendix IV  Procedure for the assignment of additional ITU-T G.994.1 parameters
     IV.1 Introduction
     IV.2 Procedure
Appendix V  Rules for code point table numbering
Bibliography
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