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1、BRITISH STANDARD BS ISO/IEC 9574:1992 Implementation of ISO/IEC 9574:1992 Information technology Provision of the OSI connection-mode network service by packet mode terminal equipment to an integrated services digital network (ISDN) UDC 681.3:621.39 Licensed Copy: sheffieldun sheffieldun, na, Tue No
2、v 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 9574:1992 This British Standard, having been prepared under the direction of the Information Systems Technology Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 March 1
3、994 BSI 10-1999 First published January 1991 Second edition March 1994 The following BSI references relate to the work on this standard: Committee reference IST/6 Draft for comment 91/63326 DC ISBN 0 580 23003 1 Committees responsible for this British Standard The preparation of this British Standar
4、d was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Committee IST/6, upon which the following bodies were represented: British Computer Society British Telecommunications plc CCTA (Government Centre for Information Systems) Digital Equipment Co. Ltd.
5、 IBM United Kingdom Ltd. Information Systems Committee of the Universities Funding Council Institution of Electrical Engineers International Computers Limited Logica UK Ltd. Ministry of Defence Rank Xerox Ltd. Swift Project Consortium Amendments issued since publication Amd. No.DateComments Licensed
6、 Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 9574:1992 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO/IEC 95741 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:
7、31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 9574:1992 ii BSI 10-1999 National foreword This British Standard reproduces verbatim ISO/IEC 9574:1992 and implements it as the UK national standard. BS ISO/IEC 9574:1992 supersedes BS ISO/IEC 9574:1989, which is withdrawn. This British Sta
8、ndard is published under the direction of the Information Systems Technology Standards Policy Committee whose Technical Committee IST/6 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals fo
9、r change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, Publications, BSI, Linford Wood, Milton Keynes, MK14 6LE. A
10、British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a
11、front cover, an inside front cover, pages i and ii, the ISO/IEC title page, pages ii to iv, pages 1 to 16 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed
12、Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9574:1992 (E) ii BSI 10-1999 Contents Page Forewordiii 1Scope1 2Normative references1 3
13、Definitions2 4Abbreviations3 5Overview3 6Provision of the CONS in systems attached at the S/T reference point4 7Provision of the CONS in systems attached at the R reference point12 Annex A Bibliography16 Figure 1 Cases covered by clause 64 Figure 2 Protocol layers at S and T reference points when D
14、channel is used in ISDN5 Figure 3 Protocol layers at S and T reference points when B channel or H channel is used in ISDN6 Figure 4 Protocol layers at R reference point13 Table 1 Cases covered by clause 65 Table 2 Mapping of Q.931 causes to CONS reasons9 Table 3 Cases covered by clause 713 Table 4 M
15、apping of X.21 progress signals to CONS reasons15 Descriptors: Data processing, information interchange, telecommunications, network interconnection, open systems interconnection, data terminal equipment, data transmission, communication procedure, ISDN. Licensed Copy: sheffieldun sheffieldun, na, T
16、ue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9574:1992 (E) BSI 10-1999iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that
17、 are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other internat
18、ional organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are
19、 circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 9574 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, in collaboration with the
20、 CCITT. The identical text is published as CCITT Recommendation X.612 This second edition cancels and replaces the first edition (ISO 9574:1989), of which it constitutes a technical revision. Annex A of this International Standard is for information only. Licensed Copy: sheffieldun sheffieldun, na,
21、Tue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9574:1992 (E) BSI 10-19991 1 Scope This Recommendation|International Standard specifies the method of providing t
22、he OSI Connection-mode Network Service (CONS) by packet mode terminal equipment connected to an Integrated Services Digital Network (ISDN) in accordance with the procedures described in Recommendation X.31. This is done by specifying the mapping of the CONS primitives and parameters to and from the
23、elements of the protocols used by two types of packet mode terminal equipment: a) an X.25 DTE (TE2) connected to an R reference point and accessing an ISDN; and b) a packet mode ISDN terminal (TE1) operating ISO/IEC 8208 packet layer protocol (PLP) and connected to an ISDN at either the S or T refer
24、ence point. This Recommendation|International Standard is applicable: a) when operating according to Recommendation X.31, either a TE1 or a TE2 is connected to a packet handler in an ISDN or an access unit to a packet-switched data network via an ISDN; b) when using an ISDN circuit-switched channel,
25、 either TE1s and/or TE2/TAs are connected directly to each other (i.e. the terminals operate in DTE/DTE mode). This Recommendation|International Standard does not address TE2s using TAs (at the R reference point) when using an ISDN circuit-switched channel with the terminals operating in DTE/DTE mod
26、e (see Recommendation X.613|ISO/IEC 10588). NOTE 1The definitions of TE1, TE2 and TA equipment, and R, S, and T reference points are given in Recommendation I.411. NOTE 2This Recommendation|International Standard applies to a TE1 or TE2/TA (i.e. an OSI End System) regardless of whether it is a physi
27、cally separate system or embedded in other equipment such as a PBX. This Recommendation|International Standard addresses the provision of the CONS using Virtual Calls as described in Recommendation X.25. It does not address the use of X.25 Permanent Virtual Circuits. The extension of this Recommenda
28、tion|International Standard to include the use of X.25 PVCs is for further study. NOTEThis Recommendation|International Standard uses numbers to identify layers, rather than their names. This is done to align the terminology of this document with the terminology of the related ISDN Recommendations,
29、and does not imply any change in the functionality of the layers from that defined in the reference model of open systems interconnection. 2 Normative references The following CCITT Recommendations and ISO/IEC International Standards contain provisions which, through reference in this text, constitu
30、te provisions of this Recommendation|International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision. Parties to agreements based on this Recommendation|International Standard are encouraged to investigate the possibili
31、ty of applying the most recent editions of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. The CCITT Secretariat maintains a list of currently valid CCITT Recommendations. 2.1 Identical Recommendations|Internationa
32、l Standards CCITT Recommendation X.213 (1992)| ISO/IEC 8348:1992, Information technology Network service definition for Open Systems Interconnection. 2.2 Paired Recommendations|International Standards equivalent in technical content CCITT Recommendation X.200 (1988), Reference model of open systems
33、interconnection for CCITT applications. ISO 7498:1984, Information processing systems Open Systems Interconnection Basic Reference Model. CCITT Recommendation X.210 (1988), Open systems interconnection layer service definition conventions. ISO/TR 8509:1987, Information processing systems Open System
34、s Interconnection Service conventions. CCITT Recommendation X.223 (1988), Use of X.25 to provide the OSI connection-mode network service for CCITT applications. ISO 8878:1987, Information processing systems Data communications Use of X.25 to provide the OSI connection-mode network service. 2.3 Addit
35、ional references CCITT Recommendation 1.231 (1988), Circuit-mode bearer service categories. CCITT Recommendation 1.232 (1988), Packet-mode bearer service categories. CCITT Recommendation 1.430 (1988), Basic User-Network Interface Layer 1 Specification. Licensed Copy: sheffieldun sheffieldun, na, Tue
36、 Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9574:1992 (E) 2 BSI 10-1999 CCITT Recommendation 1.431 (1988), Primary Rate User-Network Interface Layer 1 Specification. CCITT Recommendation Q.921 (I.441) (1988), ISDN User-Network Interface Data Link Layer Specification. CCITT Re
37、commendation Q.931 (I.451) (1988), ISDN User-Network Interface Layer 3 Specification for Basic Call Control. CCITT Recommendation V.25 bis (1988), Automatic Answering Equipment and/or Parallel Automatic Calling Equipment on the General Switched Telephone Network Including Procedures for Disabling of
38、 Echo Control Devices for Both Manually and Automatically Established Calls. CCITT Recommendation X.21 (1988), Interface Between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for Synchronous Operation on Public Data Networks. CCITT Recommendation X.21 bis (1988), Use on
39、Public Data Networks of Data Terminal Equipment (DTE) which is Designed for Interfacing to Synchronous V-series Modems. CCITT Recommendation X.25 (1988), Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and connec
40、ted to public data networks by dedicated circuit. CCITT Recommendation X.30 (I.462) (1988), Support of X.21, X.21 bis and X.20 bis based data terminal equipments (DTEs) by an integrated services digital network (ISDN). CCITT Recommendation X.31 (I.462) (1988), Support of Packet Mode Terminal Equipme
41、nt by an ISDN. CCITT Recommendation X.32 (1988), Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and accessing a packet switched public data network through a public switched telephone network or an ISDN or a cir
42、cuit switched public data network. ISO 7776:1986, Information processing systems Data communications High-level data link control procedures Description of the X.25 LAPB-compatible DTE data link procedures. ISO/IEC 8208:1990, Information technology Data communications X.25 Packet Layer Protocol for
43、Data Terminal Equipment. 3 Definitions For the purposes of this Recommendation|International Standard, the following definitions apply. 3.1 Basic reference model definitions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation X.200 |ISO 7498: a
44、) Network Connection; b) Network Layer; c) Network Service. 3.2 Service conventions definitions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation X.210|ISO/TR 8509: a) Network Service provider; b) Network Service user. 3.3 Network service def
45、initions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation X.213|ISO/IEC 8348: a) N-CONNECT request; b) N-DISCONNECT indication. 3.4 X.25 definitions This Recommendation|International Standard makes use of the following terms defined in CCITT
46、 Recommendation X.25|ISO/IEC 8208: a) DATA packet; b) Data terminal equipment; c) INCOMING CALL packet; d) Throughput class; e) User data field; 3.5 X.31 definitions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation X.31: a) Conditional notif
47、ication class of service; b) ISDN Virtual Circuit Bearer Service; c) No notification class of service; d) Packet handling function; e) PSPDN Service; f) Unconditional class of service; g) Semi-permanent-access (see Note); h) Demand access. NOTESome ISDN Recommendations use the term “permanent” to de
48、scribe this feature. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9574:1992 (E) BSI 10-19993 3.6 I.112 definitions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation I.112:
49、a) terminal equipment; b) reference point. 3.7 I.411 definitions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation I.411: a) R reference point; b) S reference point; c) T reference point; d) Terminal adaptor. 3.8 I.412 definitions This Recommendation|International Standard makes use of the following terms defined in CCITT Recommendation I.412: a) B channel; b) D channel. 3.9 X.121 definitions This Recommendation|International Standard m
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