1、 National Standard of CanadaCAN/CSA-ISO/IEC 8073:02(ISO/IEC 8073:1997)International Standard ISO/IEC 8073:1997 (fourth edition, 1997-08-15), has been adopted withoutmodification (IDT) as CSA Standard CAN/CSA-ISO/IEC 8073:02, which has been approved as a NationalStandard of Canada by the Standards Co
2、uncil of Canada.ISBN 1-55324-432-X February 2002Reference numberISO/IEC 8073:1997(E)The Canadian Standards Association (CSA), The Standards Council of Canada is theunder whose auspices this National Standard has been coordinating body of the National Standards system, produced, was chartered in 1919
3、 and accredited by a federation of independent, autonomousthe Standards Council of Canada to the National organizations working towards the furtherStandards system in 1973. It is a not-for-profit, development and improvement of voluntarynonstatutory, voluntary membership association standardization
4、in the national interest.engaged in standards development and certification The principal objects of the Council are to foster activities. and promote voluntary standardization as a means CSA standards reflect a national consensus of of advancing the national economy, benefiting theproducers and use
5、rs including manufacturers, health, safety, and welfare of the public, assisting consumers, retailers, unions and professional and protecting the consumer, facilitating domestic organizations, and governmental agencies. The and international trade, and furthering internationalstandards are used wide
6、ly by industry and commerce cooperation in the field of standards.and often adopted by municipal, provincial, and A National Standard of Canada is a standard whichfederal governments in their regulations, particularly in has been approved by the Standards Council ofthe fields of health, safety, buil
7、ding and construction, Canada and one which reflects a reasonableand the environment. agreement among the views of a number of capableIndividuals, companies, and associations across individuals whose collective interests provide to theCanada indicate their support for CSAs standards greatest practic
8、able extent a balance ofdevelopment by volunteering their time and skills to representation of producers, users, consumers, andCSA Committee work and supporting the Associations others with relevant interests, as may be appropriateobjectives through sustaining memberships. The more to the subject in
9、 hand. It normally is a standardthan 7000 committee volunteers and the 2000 which is capable of making a significant and timelysustaining memberships together form CSAs total contribution to the national interest.membership from which its Directors are chosen. Approval of a standard as a National St
10、andard ofSustaining memberships represent a major source of Canada indicates that a standard conforms to theincome for CSAs standards development activities. criteria and procedures established by the StandardsThe Association offers certification and testing Council of Canada. Approval does not refe
11、r to theservices in support of and as an extension to its technical content of the standard; this remains thestandards development activities. To ensure the continuing responsibility of the accreditedintegrity of its certification process, the Association standards-development organization.regularly
12、 and continually audits and inspects products Those who have a need to apply standards arethat bear the CSA Mark. encouraged to use National Standards of CanadaIn addition to its head office and laboratory complex whenever practicable. These standards are subject in Toronto, CSA has regional branch
13、offices in major to periodic review; therefore, users are cautioned centres across Canada and inspection and testing to obtain the latest edition from the organizationagencies in eight countries. Since 1919, the preparing the standard.Association has developed the necessary expertise to The responsi
14、bility for approving National Standards meet its corporate mission: CSA is an independent of Canada rests with theservice organization whose mission is to provide an Standards Council of Canadaopen and effective forum for activities facilitating the 270 Albert Street, Suite 200exchange of goods and
15、services through the use of Ottawa, Ontario, K1P 6N7standards, certification and related services to meet Canadanational and international needs.For further information on CSA services, write toCanadian Standards Association178 Rexdale BoulevardToronto, Ontario, M9W 1R3CanadaLes normes nationales du
16、 Canada sont publies en versions franaise et anglaise.Although the intended primary application of this Standard is stated in its Scope, it is importantto note that it remains the responsibility of the users to judge its suitability for their particular purpose.Registered trade-mark of Canadian Stan
17、dards AssociationInformation technology Open Systems Interconnection CAN/CSA-ISO/IEC 8073:02 Protocol for providing the connection-mode transport serviceFebruary 2002 Canadian Standards Association CSA/1CAN/CSA-ISO/IEC 8073:02Information technology OpenSystems Interconnection Protocolfor providing t
18、he connection-modetransport serviceCSA PrefaceStandards development within the Information Technology sector is harmonized with internationalstandards development. Through the CSA Technical Committee on Information Technology (TCIT),Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC
19、 Joint Technical Committee 1 onInformation Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO memberbody for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of theInternational Telecommunication Union (ITU), Canada participates in the Int
20、ernational Telegraph andTelephone Consultative Committee (ITU-T).This Standard supersedes CAN/CSA-ISO/IEC 8073-95 (adoption of ISO/IEC 8073:1992).This International Standard was reviewed by the CSA TCIT under the jurisdiction of the StrategicSteering Committee on Information Technology and deemed ac
21、ceptable for use in Canada. (Acommittee membership list is available on request from the CSA Project Manager.) From time to time,ISO/IEC may publish addenda, corrigenda, etc. The CSA TCIT will review these documents for approvaland publication. For a listing, refer to the CSA Information Products ca
22、talogue or CSA Info Update orcontact a CSA Sales representative. This Standard has been formally approved, without modification, bythese Committees and has been approved as a National Standard of Canada by the Standards Council ofCanada.February 2002 Canadian Standards Association 2002All rights res
23、erved. No part of this publication may be reproduced in any form whatsoever without the prior permission ofthe publisher. ISO/IEC material is reprinted with permission. Where the words “this International Standard” appear in thetext, they should be interpreted as “this National Standard of Canada”.
24、Inquiries regarding this National Standard of Canada should be addressed to Canadian Standards Association 178 Rexdale Boulevard, Toronto, Ontario, Canada M9W 1R31-800-463-6727 416-747-4044www.csa.caINTERNATIONAL STANDARD ISO/IEC 8073 Fourth edition 1997-08- 15 Information technology - Open Systems
25、Interconnection - Protocol for providing the connection-mode transport service Technologies de /information - lnterconnexion de systkmes ouverts (03) - Protocole pour fourniture du service de transpofl en mode connexion Reference number ISO/I EC 8073: 1997(E) ISO/IEC8073:1997(E) Contents 1 2 3 4 5 6
26、 Scope References 2.1 Identical Recommendations 1 International Standards 2.2 Paired Recommendations 1 International Standards equivalent in technical content Definitions Abbreviations . 4.1 Data units 4.2 Types of Transport Protocol data units . 4.3 TPDU fields 4.4 Times and associated variables .
27、4.5 Miscellaneous . Overview of the Transport Protocol . 5.1 Service provided by the Transport Layer 5.2 Service assumed from the Network Layer 5.3 Functions of the Transport Layer 5.4 Classes and options when operating over CONS 5.5 Characteristics of class 4 transport protocol when operating over
28、CLNS 5.6 Model of the Transport Layer . Elements of nrocedure 6.1 Use 0; the network service 6.2 Transport Protocol Data Unit (TPDU) transfer . 6.3 Segmenting and reassembling . 6.4 Concatenation and separation . 6.5 Connection establishment . 6.6 Connection refusal 6.7 Normal release 6.8 Error rele
29、ase when operating over CONS . 6.9 Association of TPDUs with transport connections . 6.10 Data TPDU numbering . 6.11 Expedited data transfer . 6.12 Reassignment after failure when operating over CONS . 6.13 Retention and acknowledgement of TPDUs . 6.14 Resynchronization . 6.15 Multiplexing and demul
30、tiplexing when operating over CONS 6.16 Explicit flow control . 6.17 Checksum 0 ISOAEC 1997 All rights reserved. Unless otherwise spcified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and micro- film, without
31、 permission in writing from the publisher. ISO/IEC Copyright Off b) different error rates; 4 integrity of data requirements; 4 reliability requirements. It does not require an implementation to use all of these mechanisms, nor does it define methods for measuring achieved quality of service or crite
32、ria for deciding when to release transport connections following quality of service degradation. Vi ISOPIEC ISO/IEC 8073:1997(E) The primary aim of this Recommendation I International Standard is to provide a set of rules for communication expressed in terms of the procedures to be carried out by pe
33、er entities at the time of communication. These rules for communication are intended to provide a sound basis for development in order to serve a variety of purposes, i.e.: As it is implemen a) W as a guide for implementors and designers; for use in the testing and procurement of equipment; C) as pa
34、rt of an agreement for the admittance of systems into the open systems environment; d) as a refinement of the understanding of OSI. expected that the initial users of this tors of eq uipment, this Recommendation Recommendation I International Standard International Standard contains, in notes or the
35、 implementation of the procedures defined herein. will be designers and in annexes, guidance on It should be noted that, as the number of valid protocol sequences is very large, it is not possible with current technology to verify that an implementation will operate the protocol defined in this Reco
36、mmendation I International Standard correctly under all circumstances. It is possible by means of testing to establish confidence that an implementation correctly operates the protocol in a representative sample of circumstances. It is, however, intended that this Recommendation I International Stan
37、dard can be used in circumstances where two implementations fail to communicate in order to determine whether one or both have failed to operate the protocol correctly. This Recommendation I International Standard contains a clause on conformance of equipment claiming to implement the procedures in
38、this Recommendation I International Standard. To evaluate conformance of a particular implementation, it is necessary to have a statement of which capabilities and options have been implemented for a given OS1 protocol. Such a statement is called a Protocol Implementation Conformance Statement (PICS
39、). A PICS proforma is provided in Annex C. Attention is drawn to the fact that this Recommendation I International Standard does not contain any tests to demonstrate this conformance. The variations and options available within this Recommendation I International Standard are essential as they enabl
40、e a transport service to be provided for a wide variety of applications over a variety of network qualities. Thus, a minimally conforming implementation will not be suitable for use in all possible circumstances. It is important, therefore, to qualify all references to this Recommendation 1 Internat
41、ional Standard with statements of the options provided or required or with statements of the intended purpose of provision or use. vii This page intentionally left blank ISO/IEC 8073 : 1997 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN SYSTEMS INTERCONNECTION - PROTOC
42、OL FOR PROVIDING THE CONNECTION-MODE TRANSPORT SERVICE (Malaga-Torremolinos, I984; amended at Melbourne, I988, and at Geneva, 1993; revised in 1996) 1 Scope This Recommendation 1 International Standard specifies: a five classes of procedures when operating over the connection-mode network service: 1
43、) 2) class 0: simple class; class 1: basic error recovery class; 3) class 2: multiplexing class; 4) class 3: error recovery and multiplexing class; 5) class 4: error detection and recovery class; for the connection-mode transfer of data and control information from one transport entity to a peer tra
44、nsport entity; b) one class (class 4) of procedure when operating over the connectionless-mode network service; Cl the means of negotiating the class of procedures to be used by the transport entities; d) the structure and encoding of the transport protocol data units used for the transfer of data a
45、nd control information. The procedures are defined in terms of: 0 the interactions between peer transport entities through the exchange of transport protocol data units; ii) the interactions between a transport entity and the transport service user in the same system through the exchange of transpor
46、t service primitives; iii) the interactions between a transport entity and the network service provider through the exchange of network service primitives. These procedures tables in Annex A are defined in the main text of this Recommendation 1 International Standard supplemented by state These proc
47、edures are applicable to instances of communication between systems which support the Transport Layer of the OS1 Reference Model and which wish to interconnect in an open systems environment. This Recommendation 1 International Standard specifies, in clause 14, conformance requirements for systems i
48、mplementing these procedures and provides the PICS proforma in compliance with the relevant requirements, and in accordance with the relevant guidance, given in CCITT Rec. X.291 and ISO/IEC 9646-2. It does not contain tests which can be used to demonstrate this conformance. 2 References The followin
49、g Recommendations and International Standards contain provisions which, through references in this text, constitute provisions of this Recommendation 1 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 possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and IS0 maintain registers of currently vali
