1、National Standard of Canada CANICSA -ISOIIE C 8473-4-98 International Standard ISO/IEC 8473-4:1995 (first edition, 1995-03-15) has been adopted without modification as CSA Standard C AN/CSA-ISO/IEC 8473-4-98, which has been approved as a National Standard of Canada by the Standards Council of Canada
2、. ISSN 03 I 7-5669 January 1998 Information technology - Protocol for providing the connectionless-mode network service: Provision of the underlying service by a subnetwork that provides the OS1 data link service Technologies de /information - Protocole de fourniture du service de reseau en mode san
3、s connexion: Fourniture du service sous-jacent par un sous-reseau fournissant le service de liaison de donnees OS1 Reference number ISO/IEC 8473-411 995(E) Lksociation canadienne de normalisation (CSA), sous les auspices de laquelle cette Norme nationale a et6 prbparde, a recu ses lettres patentes e
4、n 1919 et son accreditation au sein du Systbme de normes nationales par le Conseil canadien des normes en 1973. Association daffiliation libre, sans but lucratif ni pouvoir de rbglementation, elle se consacre A 14laboration de norrnes et B la certification. Les normes CSA reflbtent le consensus de p
5、roducteurs et dusagers de partour au pays, au nombre desquels se trouvent des fabricants, des consommateurs, des detaillants et des representants de syndicats, de corps professionnels et dagences gouvernementales. Lutilisation des normes CSA est trbs rdpandue dans Iindustrie et le commerce, et leur
6、adoption B divers ordres de 16gislation, tant municipal et provincial que fdddral, est chose courante, particulihrement dans Ies domaines de la sant6, de la sbcurite, du bitiment, de la construction et de Ienvironnement. Les Canadiens dun bout A Iautre du pays tbmoignent de leur appui au travail de
7、normalisation men6 par ia CSA en participant bhdvolement aux travaux des comites de la CSA et en appuyant ses objectifs par leurs cotisations de mernbres de soutien. Les quelque 7000 volontaires faisant partie des cornit cet aspect demeure la responsabilite de lorganisme rkdacteur de normes accr6dit
8、b. periodiques ; cest pourquoi il est recommand6 aux utilisateurs de se procurer 16dition la plus rdcente de la norme auprbs de Iorganisme qui la prbparde. Lapprobation dune norme en tant que Norme nationale du Canada indique quelle est conforme aux mkthodes et criteres Btablis par le Conseil canadi
9、en des normes. 11 esf recommandd aux personnes qui ont besoin de normes de se sewir des Normes nationales du Canada lorsque la chose est possible. Ces normes font lobjet dexamens The Standsrds Council of Canada is the coordinating body of the National Standards system, a federation of independent, a
10、utonomous organizations working towards the further development and improvement of voluntary standardization in the national interest, The principal objects of the Council are to foster and promote voluntary standardization as a means of advancing the national economy, benefiting the health, safety,
11、 and welfare of the public, assisting and protecting the consumer, facilitating domestic and international trade, and furthering international cooperation in the field of standards. A National Standard of Canada is a standard which has been approved by the Standards Council of Canada and one which r
12、eflects a reasonable agreement among the views of a number of capable individuals whose collective interests provide to the greatest practicable extent a balance of representation of producers, users, consumers, and others with relevant interests, as may be appropriate to the subject in hand. It nor
13、mally is a standard which is capable of making a significant and timely contribution to the national interest. Approval of a standard as a National Standard ol Canada indicates that a standard conforms to the criteria and procedures established by the Standards Council of Canada. Approval does not r
14、efer to the technical content of the standard; this remains the continuing responsibility of the accredited standards-development organization. Those who have a need to apply standards are encouraged to use National Standards of Canada whenever practicable. These standards are subject to periodic re
15、view; therefore, users are cautioned to obtain the latest edition from the organization preparing the standard. La responsabilitb dapprouver les Normes nationales du Canada incombe au The responsibility for approving National Standards of Canada rests with the Conseil canadien des normes Standards C
16、ouncil of Canada 45, rue OConnor, Bureau 1200 45 OConnor Street, Suite 1200 Q Canada Ottawa, Ontario, K1P 6N7 . Bien que le but premier vise par cefte norme soit Bnoncd sous sa rubrique Domahe dapplication, il est important de retenir quil incombe B iufilisafeur de juger si la norme convienf 4 ses b
17、esoins padiculiers. Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the user to judge its suitability for their particular purpose. Information technology - Protocol fur providing the connectionless-mode
18、 network service: Provision of the underlying service by a subnetwork that provides the QSI data link service CANICSA-ISUIIEC 8473-4-98 CANICSA-ISOIIEC 84 73 -4-98 Information technology - Protocol for providing the connectionless-mode network service: Provision of the underlying service by a subnet
19、work- that provides the OS1 data link service CSA Preface Standards development within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian Advisory committee (C
20、AC) on ISOilEC Joint Technical Committee 1 on Information Technology (ISOiIEC JTCI) for the Standards Council of Canada (SCC), the IS0 member body for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of the International Telecommunication Union (ITU), Canada partic
21、ipates in the International Telegraph and Telephone Consultative Committee (ITU-T). This International Standard was reviewed by the CSA TClT under the jurisdiction of the Strategic Steering Committee on Information Technology and deemed acceptable for use in Canada. (A committee membership list is a
22、vailable on request from the CSA Committee Administrator.) From time to time, ISOilEC may publish addenda, corrigenda, etc. The CSA TClT will review these documents for approval and publication. For a listing, refer to the CSA Information Products Catalogue or CSA Info Update or contact a CSA Sales
23、representative. This Standard has been formally approved, without modification, by these Committees and has been approved as a National Standard of Canada by the Standards Council of Canada. January 1998 0 Canadian Standards Association - I998 All rights reserved. No pad of this publication may be r
24、eproduced in any form, in an electronic retrieval system or otherwise, without the prior permission of the publisher. ISOAEC material is reprinted with the permission of the publisher. inquiries regarding this National Standard of Canada should be addressed to Canadian Standards Association, 178 Rex
25、dale Boulevard, Etobicoke, Ontario, Canada, M9 W 1 R3. January 1998 CSA/I I NT E R N AT t 0 N A L STANDARD ISO/IEC 8473-4 First edition 1995-03-1 5 Information technology - Protocol for providing the connectionless-mode network service: Provision of the underlying service by a subnetwork that provid
26、es the OS1 data link service Technologies de linformation - Protocole de fourniture du service de reseau en mode sans connexion: Fourniture du service sous-jacent par un sous-reseau fuurnissant le service de liaison de donnees OS/ Reference number ISO/IEC 8473-4:1995(E) ISOflEC 8473-4:1995(E) CONTEN
27、TS P 2 3 4 5 Scope Normative references . 2.1 Identical Recommendations I International Standards 2.2 Paired Recommendations I International Standards identical in technical content . 2.3 Additional references Definitions 3.1 Reference model definitions . 3.2 Network layer architecture definitions 3
28、.3 3.4 Data link service definitions . Network layer addressing definitions . Abbreviations . 5 . I General model . 5.2 Subnetwork user data 5.3 Subnetwork dependent convergence functions used with subnetworks that provide the OS1 data link service Subnetwork dependent convergence function Annex A .
29、 PICS proforma Abbreviations and special symbols . A.1 Introduction . A.2 A.3 Instructions for completing the PICS proforma A.4 Identification . A.6 Subnetwork dependent convergence functions for use with subnetworks that provide the OS1 connectionless Data Link service A.7 Subnetwork dependent conv
30、ergence functions for use with subnetworks that provide the OS1 connection-mode Data Link service . AS Major capabilities Pug e 1 1 1 1 1 2 2 2 2 2 2 3 3 3 9 9 0 ISO/IEC 1995 All rights reserved . Unless otherwise specified. no part of this publication may be reproduced or utilized in any form or by
31、 any means. electronic or mechanical. including photocopying and microfilm. without permission in writing from the publisher . ISOIIEC Copyright Office Case postale 56 CH-1211 Genkve 20 Switzerland ii 0 ISO/IEC ISO/IEC 8473-4: 1995(E) Foreword IS0 (the International Organization for Standardization)
32、 and IEC (the Inter- national Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC participate in the development of International Standards through technical committees established by the respective organization to de
33、al with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and I
34、EC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Inte
35、rnational Standard ISODEC 8473-4 was prepared by Joint Technical Corn- mittee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecom- munications and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T Recommendation X.623. ISODEC 84
36、73 consists of the following parts, under the general title Information technology - Protocol for providing the connectionless-mode network sewice: - Part I: Protocol specification - Part 2: Provision of the underlying sewice by an ISO/IEC 8802 subnetwork - Part 3: Provision of the underlying servic
37、e by an X.25 subnetwork - Part 4: Provision of the underlying service by a subnetwork that provides the OSI data link service Annex A forms an integral part of this part of ISO/IEC 8473. iii ISO/IEC 8473-4: 1995(E) 0 ISO/IEC Introduction This is one of a set of Recommendations and InternationaI Stan
38、dards produced to facilitate the interconnection of open systems. The set covers the services and protocols required to achieve such interconnection. This Recommendation I International Standard is positioned with respect to other related Recommendations and International Standards by the layers def
39、ined in ITU-T Rec. X.200 1 ISO/IEC 7498-1. In particular, it defines the way in which an X.25 subnetwork may be used within the Network layer to provide the abstract underlying service with respect to which the protocol defined by ITU-T Rec, X.233 I ISOAEC 8473-1 is specified. In order to evaluate t
40、he conformance of a particular implementation of this protocol, it is necessary to have a statement of which of the protocols capabilities and options have been implemented. Such a statement is called a Protocol Implementation Conformance Statement (PICS, as defined in CCITT Rec. X.290 I ISO/IEC 964
41、6-1. A PICS proforma, from which a PICS may be prepared for a specific implementation, is included in this Recommendation I International Standard as normative Annex A. iv ISO/IEC 8473-4 : 1995 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION 1 INFORMATION TECHNOLOGY - PROTOCOL FOR PROVIDING THE CONN
42、ECTIONLESS-MODE NETWORK SERVICE: PROVISION OF THE UNDERLYING SERVICE BY A SUBNETWORK THAT PROVIDES THE OS1 DATA LINK SERVICE Scope This Recommendation I International Standard specifies the way in which the underlying service assumed by the protocol defined by ITU-T Rec. X.233 1 ISO/IEC 8473-1 is pr
43、ovided by a subnetwork that provides the OS1 Data Link service defined by CCITT Rec. X.212 I ISO/IEC 8886, through the operation of a Subnetwork Dependent Convergence Function (SNDCF) as described in ISO/IEC 8648. This Recommendation I International Standard also provides the PICS proforma for this
44、protocol, in compliance with the relevant requirements, and in accordance with the relevant guidance, given in CCITT Rec. X.290 I ISO/EEC 9646-1. 2 Normative references The following Recommendations and International Standards contain provisions which, through reference in this text, constitute prov
45、isions of this Recommendation I International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation I International Standard are encouraged to investigate the possibil
46、ity of applying the most recent editions of the Recommendations and Standards listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. 2.1 2.2
47、 2.3 Identical Recommendations I Internationd Standards ITU-T Recornmendation X.200 (1994) I ISOAEC 7498-1: 1994, Information technology - Open Systems Interconnection - Basic Reference Model. CCITT Recornmendation X.2 13 (I 992) I ISOnEC 8348: 1993, Informution technology - Network service definiti
48、on for Open Systems Interconnection. Paired Recommendations I International Standards identical in technical content CCITT Recommendation X.290 (1 992), OS1 conformance testing methodology and framework for protocol Recornmendations for CCITT applications - General concepts. ISOAEC 9646- 1 : 199 1,
49、Information technology - Open Systems Interconnection - Conformance testing methodology and framework - Part I: General concepts. CCITT Recommendation X.212 (1 988), Data link service definition for Open Systems Interconnection for CCITT upp lica tio ns . ISO/IEC 8886: 1992, Information technology - Telecommunications and information exchange between systems - Data link service definition for Open Systems Interconnection. Additional references ISOAEC 8648: 1988, Information processing systems - Open Systems Interconnection - Internal organization of the network la
