1、BRITISH STANDARD BS ISO/IEC 8602:1995 Implementing Amendment No. 1, not published separately Implementation of ISO/IEC 8602:1995 Information technology Protocol for providing the OSI connectionless-mode transport service ICS 35.100.40BSISO/IEC8602:1995 This British Standard, having been prepared und
2、er the directionof the Information Systems Technology Assembly, was published under the authorityof the Standards Boardand comes into effect on 15 October 1995 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference IST/6 Draft for comment 93/641550 DC ISBN
3、0 580 24806 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee IST/6, Data communications, upon which the following bodies were represented: British Computer Society British Telecommunications plc CCTA (the Government Cent
4、re for Information Systems) Digital Equipment Co. Ltd. IBM United Kingdom Ltd. Institution of Electrical Engineers International Computers Limited Nine Tiles Computer Systems Ltd. Logica UK Ltd. Rank Xerox (UK) Ltd. Amendments issued since publication Amd. No. Date Comments 9710 December 1997 Indica
5、ted by a sideline in the marginBSISO/IEC8602:1995 BSI 04-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iv Text of ISO/IEC 8602 1BSISO/IEC8602:1995 ii BSI 04-1999 National foreword This British Standard reproduces verbatim ISO/IEC8602:1995 including amen
6、dment 1:1996 and implements it as the UK national standard. It supersedes BS7222:1990 which is withdrawn. This British Standard is published under the direction of the Information Systems Assembly whose Technical Committee IST/6 has the responsibility to: aid enquirers to understand the text; presen
7、t to the responsible international committee any enquiries on interpretation, or proposals for 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 a
8、vailable from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A 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 conf
9、er immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO/IEC title page, pages ii to iv, pages1 to 15 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This
10、will be indicated in the amendment table on the inside front cover.ISO/IEC8602:1995(E) ii BSI 04-1999 Contents Page Foreword iv Introduction 1 1 Scope 1 2 Normative references 2 2.1 Identical Recommendations|International Standards 2 2.2 Paired Recommendations|International Standards equivalent in t
11、echnical content 2 Section 1. General 3 Definitions 2 3.1 Reference Model definitions 2 3.2 This Recommendation|International Standard uses the following terms defined in CCITT Rec. X.290|ISO/IEC9646-1: 2 3.3 Additional definitions 3 4 Abbreviations 3 4.1 Data units 3 4.2 Types of transport-protocol
12、-data-units 3 4.3 TPDU fields 3 4.4 Parameters 3 4.5 Miscellaneous 3 5 Overview of the transport protocol 3 5.1 Service provided by the Transport Layer 3 5.2 Service assumed from the Network Layer 4 5.3 Functions of the Transport Layer 4 5.4 Model of the Transport Layer 4 Section 2. Connectionless-m
13、ode transportprotocol specification 6 Protocol mechanisms 6 6.1 Transport-protocol-data-unit (TPDU) transfer 6 6.2 Transfer over the connectionless-mode network service 6 6.3 Transfer over the connection oriented network service 7 6.4 Checksum 8 7 Encoding of the unit data (UD) TPDU 8 7.1 General 8
14、7.2 Unit data (UD) TPDU 9 8 Conformance 10 Annex A State table 11 Annex B PICS proforma 12 B.1 Introduction 12 B.2 Abbreviations and special symbols 12 B.3 Instructions for Completing the PICS Proforma 12 B.4 Identification 13 B.5 Base Standard/Recommendation Conformance 13 B.6 General Statement of
15、Conformance 13 B.7 PICS Proforma 13 Annex C Checksum algorithms 14 C.1 Symbols 14 C.2 Arithmetic conventions 15 C.3 Algorithm for generating checksum parameters 15 C.4 Algorithm for checking checksum parameters 15 Figure 1 Relationship between the connectionless-mode transport protocol and adjacent
16、services 1 Figure 2 Model of the Transport Layer 5ISO/IEC8602:1995(E) BSI 04-1999 iii Page Table 1 Transport service primitives 3 Table 2 Connection-mode network service primitives 5 Table 3 Connectionless-mode network service primitives 6 Table A.1 Predicates 11 Table A.2 Actions 11 Table A.3 Notes
17、 11 Table A.4 State table 11ISO/IEC8602:1995(E) iv BSI 04-1999 Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participa
18、te 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 international organizations, governmental an
19、d non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEChave established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for vo
20、ting. Publication as an International Standard requires approval by at least 75% of the national bodies casting a vote. International Standard ISO/IEC8602 was prepared by Joint Technical Committee ISO/IEC JTC1, Information technology, Subcommittee SC 6, Telecommunications and information exchange be
21、tween systems, in collaboration with ITU-T. Theidentical text is published as ITU-T Recommendation X.234. This second edition cancels and replaces the first edition (ISO8602:1987). Annex A andAnnex B form an integral part of this International Standard. Annex C is for information only.ISO/IEC8602:19
22、95(E) BSI 04-1999 1 Introduction This Recommendation|International Standard is one of a set of Recommendations and International Standards produced to facilitate the interconnection of computer systems. The set of Recommendations and International Standards covers the services and protocols required
23、 to achieve such interconnection. This Recommendation|International Standard ispositioned with respect to other related Recommendations and International Standards bythe layers defined in the Reference Model for OpenSystems Interconnection (see ITU-T Rec. X.200|ISO/IEC7498-1). In particular, it is a
24、 protocol of the Transport Layer. It is most closely related to the transport service definition (see ITU-T Rec. X.214|ISO/IEC8072) and the network service definition (see CCITT Rec. X.213|ISO/IEC8348). The interrelationship between these Recommendations and International Standards is illustrated in
25、 Figure 1. The structure of this Recommendation|International Standard is similar to the structure of ITU-T Rec. X.224|ISO/IEC8073 in order to facilitate cross reference between the two transport protocols. Introduction to amendment 1 This amendment to ITU-T Rec. X.234 (1994)| ISO/IEC8602:1995 provi
26、des the capability to the connectionless-mode Transport protocol to supportmulticast PDU transfer when used in conjunctionwith the multicast services of the connectionless-mode Network service. The protocol for providing the connectionless-mode Transport service is contained entirely in ITU-T Rec. X
27、.234|1SO/IEC8602. ITU-T Rec. X.234|ISO/IEC8602 restricts the connectionless-mode Transport to the case of exchanging TPDUs between one sending TS-user and one receiving TS-user. Subnetwork standards exist which support the transfer of a SDU from one entity to a number of other entities in a single l
28、ogical operation. Work is on-going to develop the capabilities for exchanging multicast PDUs at the Network layer. This amendment is directed at providing multicast Transport service via multicast capabilities of the Network service if they are available. With the current ITU-T Rec. X.234|ISO/IEC860
29、2, no Transport layer capabilities are described to utilize such multicast Network services. This amendment defines additional assumptions concerning the services optionally provided by the Network layer and adds no new functions of its own. 1 Scope This Recommendation|International Standard specifi
30、es a) procedures for the connectionless-mode transmission of data and protocol control information from one transport entity to one or more peer transport entities; b) the encoding of the transport-protocol-data-units used for the transmission of data and control information; c) procedures for the c
31、orrect interpretation of transport protocol control information; and d) the functional requirements for implementations claiming conformance to this Recommendation|International Standard. The procedures are defined in terms of a) the interactions among peer transport entitiesthrough the exchange of
32、transport-protocol-data-units; b) the interactions between a transport entity and a transport service user through the exchange of transport service primitives; and c) the interaction between a transport entity and a network service provider through the exchange of network service primitives. This R
33、ecommendation|International Standard specifies the connectionless-mode transport protocol and provides the PICS Proforma in compliance with the relevant requirements, and in accordance with the relevant guideline, given in CCITT Rec. X.291|ISO/IEC9646-2. The protocol for providing the connection-mod
34、e transport service is specified in ITU-T Rec. X.224|ISO/IEC8073. Figure 1 Relationship between the connectionless-mode transport protocol andadjacent servicesISO/IEC8602:1995(E) 2 BSI 04-1999 2 Normative references The following Recommendations and International Standards contain provisions, which
35、through references in the text, constitute provisions of this Recommendation|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|International Standard
36、 are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of curr
37、ently valid ITU-T Recommendations. 2.1 Identical Recommendations| International Standards ITU-T Recommendation X.200 (1994)|ISO/IEC7498-1:1994 Information technology Open Systems Interconnection Basic Reference Model: The Basic Model. CCITT Recommendation X.213 (1992)|ISO/IEC8348:1993 Information te
38、chnology Open Systems Interconnection Network Service Definition. ITU-T Recommendation X.214 (1993)|ISO/IEC8072:1994 Information technology Open Systems Interconnection Transport service definition. 2.2 Paired Recommendations|International Standards equivalent in technical content ITU-T Recommendati
39、on X.224 (1993), Protocol for providing the OSI connection-mode transport service. ISO/IEC 8073:1992, Information technology Telecommunications and information exchange between systems Open Systems Interconnection Protocol for providing the connection-mode transport service. ITU-T Recommendation X.2
40、64 (1993), Transport protocol identification mechanism. ISO/IEC 11570:1992, Information technology Telecommunications and information exchange between systems Open Systems Interconnection Transport protocol identification mechanism. CCITT Recommendation X.290 (1992), OSI conformance testing methodol
41、ogy and framework for protocol Recommendations for CCITT applications General Concepts. ISO/IEC 9646-1:1991, Information technology Open Systems Interconnection Conformance testing methodology and framework Part 1: General concepts. CCITT Recommendation X.291 (1992), OSI conformance testing methodol
42、ogy and framework for protocol Recommendations for CCITT applications Abstract test suite specification. ISO/IEC 9646-2:1991, Information technology Open Systems Interconnection Conformance testing methodology and framework Part 2: Abstract test suite specification. Section 1. General 3 Definitions
43、For the purposes of this Recommendation|International Standard, the following definitions apply. 3.1 reference model definitions this Recommendation|International Standard isbased on the concepts developed in ITU-T Rec. X.200|ISO/IEC7498-1, and makes use of the following terms defined therein: a) Tr
44、ansport layer; b) transport service; c) transport-service-access-point; d) transport-service-access-point-address; e) transport-service-data-unit; f) network Layer; g) network service; h) network connection; i) network-service access-point; j) transport protocol; k) connectionless-mode transmission.
45、 3.2 this Recommendation|International Standard uses the following terms defined in CCITT Rec. X.290|ISO/IEC9646-1: a) PICS Proforma; b) protocol implementation conformance statement (PICS).ISO/IEC8602:1995(E) BSI 04-1999 3 3.3 Additional definitions for the purposes of this Recommendation|Internati
46、onal standard, the following definitions apply. 3.3.1 source-transport-address identifies the TSAP through which the transport service user may act as the source of data duringaparticular instance of transport connectionless-mode transmission 3.3.2 destination-transport-address identifies the TSAP t
47、hrough which the transportservice user may act as the sink of data during aparticular instance of transport connectionless-mode transmission. The destination-transport address may identify a group of transport service users connected to different network entities depending on the services used and p
48、rovided by the network service provider 3.3.3 connection oriented transport protocol see3.1, “transport protocol” 3.3.4 connection oriented transport service see3.1, “transport service” 3.3.5 connection oriented network service see3.1, “network service” 3.3.6 connectionless-mode transport protocol t
49、ransport protocol for providing the connectionless-mode transport service 3.3.7 connectionless-mode transport service transport service providing connectionless-mode transmission 3.3.8 connectionless-mode network service network service providing connectionless-mode transmission 4 Abbreviations 4.1 Data units 4.2 Types of transport-protocol-data-units 4.3 TPDU fields 4.4 Parameters Source TSAP-ID Destination TSAP-ID Checksum 4.5 Miscellaneous 5 Overview of the transport protocol 5.1 Service prov
