1、 International Telecommunication Union ITU-T V.75TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(01/2005) SERIES V: DATA COMMUNICATION OVER THE TELEPHONE NETWORK Simultaneous transmission of data and other signals DSVD terminal control procedures Corrigendum 1 ITU-T Recommendation V.75
2、 (1996) Corrigendum 1 ITU-T V-SERIES RECOMMENDATIONS DATA COMMUNICATION OVER THE TELEPHONE NETWORK General V.1V.9 Interfaces and voiceband modems V.10V.34 Wideband modems V.35V.39 Error control V.40V.49 Transmission quality and maintenance V.50V.59 Simultaneous transmission of data and other signals
3、 V.60V.99 Interworking with other networks V.100V.199 Interface layer specifications for data communication V.200V.249 Control procedures V.250V.299 Modems on digital circuits V.300V.399 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. V.75 (1996)/Cor.1 (01/2005) i
4、ITU-T Recommendation V.75 DSVD terminal control procedures Corrigendum 1 Summary This corrigendum addresses corrections and clarifications in ITU-T Rec. V.75 (1996) concerning errors and omissions in Tables 3 and 6, positioning of segmentation/reassembly header, negotiation of suspend/resume option,
5、 usage of H.245 “portNumber“, normative references, and update of the ASN.1 regarding N401 Value Range, H.245 codepoints for V.42 bis on an ERM channel, and codepoint for G.729 Annex B. Source Corrigendum 1 to ITU-T Recommendation V.75 (1996) was approved on 8 January 2005 by ITU-T Study Group 16 (2
6、005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. V.75 (1996)/Cor.1 (01/2005) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a perman
7、ent organ of ITU. 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 Assembly (WTSA), which meets every four years, establish
8、es the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standar
9、ds 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. Compliance with this Recommendation is voluntary. However, the Recomm
10、endation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are
11、used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intel
12、lectual Property Right. 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, ITU had not receiv
13、ed 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 2005 All rights reserved.
14、No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. V.75 (1996)/Cor.1 (01/2005) iii CONTENTS Page 1) Corrections to Table 3/V.75 . 1 2) Missing H.245 message specifications in Table 6/V.75. 2 3) Clarification on usage of H.2
15、45 “portNumber“ 3 4) Addition of codepoint for G.729 Annex B . 3 5) Reference to ISO 13239 3 6) Correction positioning of segmentation/reassembly header. 4 7) N401 Value Range 4 8) Negotiation of suspend/resume option . 4 9) Addition of H.245 codepoints for V.42 bis on an ERM channel . 5 ITU-T Rec.
16、V.75 (1996)/Cor.1 (01/2005) 1 ITU-T Recommendation V.75 DSVD terminal control procedures 1) Corrections to Table 3/V.75 Amend Table 3/V.75 as indicated by the underlined: Table 3/V.75 L-ESTABLISH user-data parameters L-ESTABLISH MF primitives Applicable H.245 parameters CE reference Comments request
17、 OpenLogicalChannel.forwardLogicalChannel Number.LogicalChannelNumber 1a.1 indication OpenLogicalChannel.forwardLogicalChannel Parameters.portNumber 1a.9 required to be present for DSVD and shall identify a logical channel user. OpenLogicalChannel.forwardLogicalChannel Parameters.multiplexParameters
18、.v76Logical ChannelParameters 1a.4 1a.8 shall be present for DSVD OpenLogicalChannel.reverseLogicalChannel Parameters.multiplexParameters.v76Logical ChannelParameters 1a.4 1a.8 shall be present for DSVD OpenLogicalChannel.forwardLogicalChannel Parameters.v76Parameters.v75Parameters 1a.3 shall be pre
19、sent for DSVD OpenLogicalChannel.forwardLogicalChannel Parameters.dataType.AudioData 1a.10 OpenLogicalChannel.forwardLogicalChannel Parameters.dataType.dataDataApplication Capability 1a.10 OpenLogicalChannel.reverseLogicalChannel Parameters 1a.11 shall be present for DSVD OpenLogicalChannel.reverseL
20、ogicalChannel Parameters.v76Parameters.v75Parameters 1a.3 shall be present for DSVD OpenLogicalChannel.reverseLogicalChannel Parameters.dataType 1a.11 identical to forward datatype parameters with the exception of the AudioCapability INTEGER response confirm OpenLogicalChannelAck.forwardLogical Chan
21、nelNumber OpenLogicalChannelAck.portNumber 1a.12 1a.12 shall be present for DSVD 2 ITU-T Rec. V.75 (1996)/Cor.1 (01/2005) 2) Missing H.245 message specifications in Table 6/V.75 Implement the following two changes: Add “ TerminalCapabilitySet.sequenceNumber“ as first entry in 2nd column of Table 6/V
22、.75. Add “ RequestMode.ModeDescription.ModeElement.V76ModeParameters“ below “ Endsession“ entry in 2nd column of Table 6/V.75. Table 6/V.75 L-DATA user-data parameters L-DATA MF primitives Valid H.245 parameters CE reference Comments request TerminalCapabilitySet.sequenceNumber indication TerminalCa
23、pabilitySet.OBJECTIDENTIFIER N/A = 0 0 8 245 0 1 TerminalCapabilitySet.MultiplexCapability. VGMUX Capability 1a.17, 1a.18 required to be present for DSVD, all subparameters apply TerminalCapabilitySet.capabilityTable N/A required to be present for DSVD TerminalCapabilitySet.capabilityTable.capabilit
24、y N/A required to be present for DSVD TerminalCapabilitySet.capabilityTable.capability. receiveandTransmitAudioCapability 1a.20 all subparameters apply TerminalCapabilitySet.capabilityTable.capability. receiveandTransmitDataApplicationCapability 1a.20 all subparameters apply TerminalCapabilitySet.ca
25、pabilityDescriptors. CapabilityDescriptorNumber N/A TerminalCapabilitySet.capabilityDescriptors. simultaneousCapabilities 1a.22 required to be present for DSVD TerminalCapabilitySet.capabilityDescriptors. simultaneousCapabilities. AlternativeCapabilitySet 1a.23 EndSessionCommand RequestMode.ModeDesc
26、ription.ModeElement. V76ModeParameters 1a.22 all subparameters apply response confirm (acknow-ledgement) TerminalCapabilitySetAck.sequenceNumber N/A = 0 for DSVD response confirm (reject) TerminalCapabilitySetReject.cause.unspecified 1a.21 all subparameters apply ITU-T Rec. V.75 (1996)/Cor.1 (01/200
27、5) 3 3) Clarification on usage of H.245 “portNumber“ Add the following text to the end of clause 8.1: “NOTE The portNumber parameter shall have a default value of “0“, which indicates an “unspecified“ input or output association. Use of other values of this parameter is for further study.“ 4) Additi
28、on of codepoint for G.729 Annex B Implement the following two changes: Add G.729 Annex B to clause 2 (References): ITU-T Recommendation G.729 Annex B (1996), A silence compression scheme for G.729 optimized for terminals conforming to Recommendation V.70. In Annex A (H.245 version 1 syntax additions
29、 for V.75 control functions), replace the definition of AudioCapability with the following: AudioCapability :=CHOICE nonStandard nonStandardParameter, g711Alaw64k INTEGER(1256), g711Alaw56k INTEGER(1256), g711Ulaw64k INTEGER(1256), g711Ulaw56k INTEGER(1256), g722-64k INTEGER(1256), g722-56k INTEGER(
30、1256), g722-48k INTEGER(1256), g7231 SEQUENCE maxAI-sduAudioFrames INTEGER(1256), silenceSuppression BOOLEAN , g728 INTEGER(1256), g729 INTEGER(1256), g729AnnexA INTEGER(1256), is11172AudioCapability is11172AudioCapability, is13818AudioCapability is13818AudioCapability, , g729wAnnexB INTEGER(1256),
31、g729AnnexAwAnnexB INTEGER(1256) 5) Reference to ISO 13239 Add reference to ISO 13239 (formerly ISO 3309) in clause 8.3.1: “For the purposes of DSVD sessions, data link parameters associated with the “parameter negotiation“ and “private parameter negotiation“ subfield shall be included as user-data i
32、n the H.245 TerminalCapabilitySet message within an L-SETPARM primitive. The user-data of an L-SETPARM primitive shall be contained within an ISO 13239 FI field encoded as “133D“.“ Insert in clause 2, References: ISO/IEC 13239:2002, Information technology Telecommunications and information exchange
33、between systems High-level data link control (HDLC) procedures. 4 ITU-T Rec. V.75 (1996)/Cor.1 (01/2005) 6) Correction positioning of segmentation/reassembly header Amend the first paragraph of clause 11.1 to read: “An H-header octet shall be is added as the first octet in the information before the
34、 address field of every the frame to be transmitted on the DLC. The format of the H octet is shown in Figure 2. “ 7) N401 Value Range In Annex A, change the following data structure in the annex of V.75 as in the underlined: V76HDLCParameters :=SEQUENCE crcLength CRCLength, n401 INTEGER (1127)(14095
35、), loopbackTestProcedure BOOLEAN, 8) Negotiation of suspend/resume option In Annex A, replace the definition of V76LogicalChannelParameters with the following: V76LogicalChannelParameters :=SEQUENCE hdlcParameters V76HDLCParameters, suspendResume CHOICE noSuspendResume NULL, suspendResumewAddress NU
36、LL, suspendResumewoAddress NULL, , uIH BOOLEAN, mode CHOICE eRM SEQUENCE windowSize INTEGER (1127), recovery CHOICE rej NULL, sREJ NULL, mSREJ NULL, , , uNERM NULL, , v75Parameters V75Parameters, ITU-T Rec. V.75 (1996)/Cor.1 (01/2005) 5 9) Addition of H.245 codepoints for V.42 bis on an ERM channel
37、In Annex A, replace the definition of DataProtocolCapability, CompressionType, and V42bis with the following: DataProtocolCapability := CHOICE nonStandard NonStandardParameter, v14buffered NULL, v42lapm NULL, hdlcFrameTunnelling NULL, h310SeparateVCStack NULL, h310SingleVCStack NULL, transparent NUL
38、L, , segmentationAndReassembly NULL, hdlcFrameTunnellingwSAR NULL, v120 NULL, - as in ITU-T Rec. H.230 separateLANStack NULL, v76wCompression CHOICE transmitCompression CompressionType, - P0=1 receiveCompression CompressionType, - P0=2 transmitAndReceiveCompression CompressionType, - P0=3 Compressio
39、nType :=CHOICE - Newly added structure v42bis V42bis, - Future methods of compression will - have to be added after the ext. - marker V42bis :=SEQUENCE - Newly added structure numberOfCodewords INTEGER (165536), - P1 maximumStringLength INTEGER (1256), - P2 Printed in Switzerland Geneva, 2005 SERIES
40、 OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital system
41、s and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of
42、cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, tel
43、ephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
