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`INTERNATIONAL TELECOMMUNICATION UNION
`
`
`
`ITU-T
`
`
`
`TELECOMMUNICATION
`STANDARDIZATION SECTOR
`OF ITU
`
`G.992.1
`
`(06/99)
`
`SERIES G: TRANSMISSION SYSTEMS AND MEDIA,
`DIGITAL SYSTEMS AND NETWORKS
`Digital transmission systems – Digital sections and digital
`line system – Access networks
`
`
`Asymmetric digital subscriber line (ADSL)
`transceivers
`
`ITU-T Recommendation G.992.1
`(Previously CCITT Recommendation)
`
`
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`
`ITU-T G-SERIES RECOMMENDATIONS
`TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
`
`
`INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS
`INTERNATIONAL ANALOGUE CARRIER SYSTEM
`GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-
`TRANSMISSION SYSTEMS
`INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE
`SYSTEMS ON METALLIC LINES
`GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE
`SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION
`WITH METALLIC LINES
`COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY
`TESTING EQUIPMENTS
`TRANSMISSION MEDIA CHARACTERISTICS
`DIGITAL TRANSMISSION SYSTEMS
`TERMINAL EQUIPMENTS
`DIGITAL NETWORKS
`DIGITAL SECTIONS AND DIGITAL LINE SYSTEM
`General
`Parameters for optical fibre cable systems
`Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s
`Digital line transmission systems on cable at non-hierarchical bit rates
`Digital line systems provided by FDM transmission bearers
`Digital line systems
`Digital section and digital transmission systems for customer access to ISDN
`Optical fibre submarine cable systems
`Optical line systems for local and access networks
`Access networks
`
`
`
`For further details, please refer to ITU-T List of Recommendations.
`
`
`G.100–G.199
`
`G.200–G.299
`
`G.300–G.399
`
`G.400–G.449
`
`G.450–G.499
`
`G.600–G.699
`
`G.700–G.799
`G.800–G.899
`G.900–G.999
`G.900–G.909
`G.910–G.919
`G.920–G.929
`G.930–G.939
`G.940–G.949
`G.950–G.959
`G.960–G.969
`G.970–G.979
`G.980–G.989
`G.990–G.999
`
`
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`ITU-T RECOMMENDATION G.992.1
`ASYMMETRIC DIGITAL SUBSCRIBER LINE (ADSL) TRANSCEIVERS
`
`3)
`
`
`Summary
`This Recommendation describes Asymmetric Digital Subscriber Line (ADSL) Transceivers on a
`metallic twisted pair that allows high-speed data transmission between the network operator end
`(ATU-C) and the customer end (ATU-R). This Recommendation provides a variety of bearer
`channels in conjunction with one of three other services dependent on the environment:
`1)
`ADSL transmission simultaneously on the same pair with voice (band) service;
`2)
`ADSL transmission simultaneously on the same pair with G.961 (Appendix I or II) ISDN
`services; or
`ADSL transmission on the same pair with voiceband transmission and with TCM-ISDN
`(G.961 Appendix III) in an adjacent pair.
`Systems allow approximately 6 Mbit/s downstream and approximately 640 kbit/s upstream data rates
`depending on the deployment and noise environment.
`This Recommendation specifies the physical layer characteristics of the Asymmetric Digital
`Subscriber Line (ADSL) interface to metallic loops.
`This Recommendation has been written to help ensure the proper interfacing and interworking of
`ADSL transmission units at the customer end (ATU-R) and at the network operator end (ATU-C)
`and also to define the transport capability of the units. Proper operation shall be ensured when these
`two units are manufactured and provided independently. A single twisted pair of telephone wires is
`used to connect the ATU-C to the ATU-R. The ADSL transmission units must deal with a variety of
`wire pair characteristics and typical impairments (e.g. crosstalk and noise).
`An ADSL transmission unit can simultaneously convey all of the following: downstream simplex
`bearers, duplex bearers, a baseband analogue duplex channel, and ADSL line overhead for framing,
`error control, operations and maintenance. Systems support a minimum of 6.144 Mbit/s downstream
`and 640 kbit/s upstream.
`This Recommendation includes mandatory requirements, recommendations and options; these are
`designated by the words "shall", "should" and "may" respectively. The word "will" is used only to
`designate events that take place under some defined set of circumstances.
`Two categories of performance are specified. Category I performance is required for compliance
`with this Recommendation; performance enhancement options are not required for category I
`equipment. Category II is a higher level of performance (i.e. longer lines and greater impairments).
`Category II performance and characteristics are not required for compliance with
`this
`Recommendation.
`This Recommendation defines several optional capabilities and features:
`(cid:127)
`echo cancellation;
`(cid:127)
`trellis coded modulation;
`(cid:127)
`dual latency;
`(cid:127)
`transport of a network timing reference;
`(cid:127)
`transport of STM and/or ATM;
`(cid:127)
`reduced overhead framing modes.
`It is the intention of this Recommendation to provide, by negotiation during initialization, for
`U-interface compatibility and
`interoperability between
`transceivers complying
`to
`this
`Recommendation and between transceivers that include different combinations of options.
`Source
`ITU-T Recommendation G.992.1 was prepared by ITU-T Study Group 15 (1997-2000) and was
`approved under the WTSC Resolution No. 1 procedure on 22 June 1999.
`
`
`
`
`
`Recommendation G.992.1 (06/99)
`
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`
`FOREWORD
`ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of
`telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of
`the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing
`Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
`The World Telecommunication Standardization Conference (WTSC), which meets every four years,
`establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on
`these topics.
`The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in
`WTSC Resolution No. 1.
`In some areas of information technology which fall within ITU-T’s purview, the necessary standards are
`prepared on a collaborative basis with ISO and IEC.
`
`
`
`
`
`
`NOTE
`In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
`telecommunication administration and a recognized operating agency.
`
`
`
`INTELLECTUAL PROPERTY RIGHTS
`The ITU draws attention to the possibility that the practice or implementation of this Recommendation may
`involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence,
`validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others
`outside of the Recommendation development process.
`As of the date of approval of this Recommendation, the ITU had received notice of intellectual property,
`protected by patents, which may be required to implement this Recommendation. However, implementors are
`cautioned that this may not represent the latest information and are therefore strongly urged to consult the
`TSB patent database.
`
`
`
`
`
`
` ITU 2000
`All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,
`electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.
`
`ii
`
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`
`
`CONTENTS
`
`Scope...........................................................................................................................
`System reference model..............................................................................................
`Objectives ...................................................................................................................
`
`References...................................................................................................................
`
`Definitions ..................................................................................................................
`
`Abbreviations..............................................................................................................
`
`Reference Models .......................................................................................................
`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 ...............................
`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 ...............................
`ATU-C/R transmitter timing model (Annex C only)..................................................
`
`Transport capacity.......................................................................................................
`Transport of STM data................................................................................................
`Transport of ATM data ...............................................................................................
`ADSL system overheads and total bit rates ................................................................
`
`ATU-C functional characteristics ...............................................................................
`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............................................................
`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 ...........................................................
`Network timing reference (NTR)................................................................................
`7.3.1 Need for NTR ................................................................................................
`7.3.2 Transport of the NTR ....................................................................................
`Framing.......................................................................................................................
`7.4.1 Data symbols .................................................................................................
`
`
`1
`1.1
`1.2
`
`2
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`3
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`4
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`5
`5.1
`
`5.2
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`5.3
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`6
`6.1
`6.2
`6.3
`
`7
`7.1
`
`7.2
`
`7.3
`
`7.4
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`7.5
`7.6
`
`7.7
`7.8
`
`7.9
`
`7.4.2 Synchronization .............................................................................................
`7.4.3 Reduced overhead framing............................................................................
`Scramblers ..................................................................................................................
`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)....................
`Tone ordering..............................................................................................................
`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 ....................................................................................
`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
`8.1
`
`8.2
`
`ATU-R Functional Characteristics .............................................................................
`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............................................................
`ATM Transport Protocol Specific functionalities.......................................................
`8.2.1 ATU-R input and output T interfaces for ATM transport .............................
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`8.3
`8.4
`
`8.2.2 ATM Cell specific functionalities .................................................................
`8.2.3 Framing Structure for ATM transport ...........................................................
`Network timing reference ...........................................................................................
`Framing.......................................................................................................................
`8.4.1 Data symbols .................................................................................................
`8.4.2 Synchronization .............................................................................................
`8.4.3 Reduced overhead framing............................................................................
`Scramblers ..................................................................................................................
`8.5
`Forward error correction .............................................................................................
`8.6
`Tone ordering..............................................................................................................
`8.7
`Constellation encoder – Trellis version ......................................................................
`8.8
`Constellation encoder – Uncoded version ..................................................................
`8.9
`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
`9.1
`9.2
`
`9.3
`
`EOC Operations and Maintenance..............................................................................
`Clear EOC...................................................................................................................
`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.......................................................................................
`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............................................
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`9.4
`9.5
`
`Failures and Performance Parameters.........................................................................
`Test Parameters...........................................................................................................
`9.5.1 Near-end test parameters ...............................................................................
`9.5.2 Far-end test parameters..................................................................................
`
`10.4
`
`Initialization ................................................................................................................
`10
`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 .................................................................................................
`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 .................................................................................................
`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 .........................................................................................................
`
`10.5
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`10.8
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`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 .................................................................................................
`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 ....................................................................................................
`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
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`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
`11.1
`
`AOC on-line adaptation and reconfiguration..............................................................
`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..............................