1、BRITISH STANDARD BS ISO/IEC 14700:1997 Information technology OpenSystems Interconnection Network Fast Byte Protocol ICS 35.100.30BSISO/IEC 14700:1997 This British Standard, having been prepared under the directionof the DISC Board, waspublished under the authorityof the Standards Boardand comes int
2、o effect on 15December 1997 BSI 06-1999 ISBN 0 580 28855 2 National foreword This British Standard reproduces verbatim ISO/IEC14700:1997 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/6, Data communications, which has t
3、he responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related in international and European developments and promulgate them in
4、the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from
5、 one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International
6、 Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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
7、Standard does not of itself confer 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, pagesii toiv, pages1 to23 and a back cover. This standard has been updated (see copyright date) and may have had a
8、mendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS ISO/IEC 14700:1997 BSI 06-1999 i Contents Page National foreword Inside front cover Foreword iv Text of ISO/IEC14700 1ii blankBS ISO/IEC 14700
9、:1997 ii BSI 06-1999 Contents Page Foreword iv Introduction 1 1 Scope 2 2 Normative references 2 2.1 Identical Recommendations|International Standards 2 2.2 Paired Recommendations|International Standards equivalent in technical contents 3 3 Definitions 3 3.1 This Recommendation|International Standar
10、d is based on the concepts developed in ITU-T Rec. X.200|ISO/IEC7498-1 and makes use of the following terms defined in it: 3 3.2 For the purposes of this Recommendation|International Standard, the following definitions apply: 3 3.3 This Recommendation|International Standard uses the following terms
11、defined in ITU-T Rec. X.290 and ISO/IEC9646-1: 4 3.4 This Recommendation|International Standard uses the following terms defined in ITU-T Rec. X.210|ISO/IEC10731: 4 4 Symbols and abbreviations 4 4.1 Data units 4 4.2 NPDU types 4 4.3 NPDU fields 4 4.4 Miscellaneous 5 5 Overview of the Network Fast By
12、te Protocol 5 5.1 Service provided by the Network Layer 5 5.2 Service assumed from the Data Link Layer 5 5.3 Functions of the Network Layer 5 5.4 Operation over CODLS 7 5.5 Model of the Network Layer 8 6 Network Fast Byte Protocol specification 8 6.1 Network Protocol Data Unit (NPDU) transfer 9 6.2
13、Connection establishment 9 6.3 Connection refusal 10 6.4 Normal release 11 6.5 Error Indication 11 6.6 Abnormal release 12 6.7 Data transfer 12 6.8 Segmenting and reassembling 12 6.9 Qualifier-bit 13 6.10 Invalid NPDU 13 6.11 NS-user initiated reset 13 7 FB-NPDU Structure and encoding 14 7.1 Header
14、part 14 7.2 Control part 15 7.3 Data part 17 8 Conformance 17 Annex A Protocol Implementation Conformance Statement (PICS) proforma 18 A.1 General 18 A.2 Identification 18 A.3 Indices used in this annex 19 A.4 Initiator/responder capability to establish connection 19BS ISO/IEC14700:1997 BSI 06-1999
15、iii Page A.5 Supported functions 19 A.6 Supported NPDUs 19 A.7 Supported FB NPDU fields and parameters 20 A.8 Negotiation and selection 20 A.9 Error handling 21 Annex B Subnetwork Dependent Convergence Function for subnetworks employing out-of-band signalling 21 B.1 Applicable subnetworks 21 B.2 Fas
16、t Byte Protocol specification 21 Figure Intro. 1 Relationship between the Network Fast Byte Protocol and adjacent services 1 Figure 1 Model of the network layer 1 Table 1 Network Service primitives 6 Table 2 Connection-Oriented Data link service primitives 7 Descriptors: Data processing, information
17、 interchange, telecommunications, network interconnection, open systems interconnection, network layer, protocols.BS ISO/IEC 14700:1997 iv BSI 06-1999 Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system
18、 for worldwide standardization. National bodies that 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 coll
19、aborate in fields of mutual interest. Other international 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 JTC1. Draft International Sta
20、ndards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least75% of the national bodies casting a vote. International Standard ISO/IEC14700was prepared by Joint Technical Committee ISO/IEC JTC1, In
21、formation technology, Subcommittee SC6, Telecommunications and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T Recommendation X.633. Annex A forms an integral part of this International Standard. Annex B is for information only.BS ISO/IEC 1
22、4700:1997 BSI 06-1999 1 Introduction This Recommendation|International Standard is one of a set of Recommendations|International Standards produced to facilitate the interconnection of information processing systems. This set of Recommendations|International Standards covers the services and protoco
23、ls required to achieve such interconnection. The Network Fast Byte Protocol Recommendation|International Standard is positioned with respect to other related Recommendations|International Standards by the layers defined in the Reference Model for Open Systems Interconnection (see ITU-T Rec. X.200|IS
24、O/IEC7498-1). It is most closely related to, and lies within the field of application of the Network Service definition (ITU-T Rec. X.213|ISO/IEC8348). It also uses and makes reference to the Data Link Service definition (see ITU-T Rec. X212|ISO/IEC8886), whose provisions it assumes in order to acco
25、mplish Network Fast Bytes aims. The interrelationship of these Recommendations|International Standards is illustrated in Figure Intro. 1. This Recommendation|International Standard specifies a common encoding and protocol procedures. It is intended that the Network Fast Byte should be simple and cat
26、er for a specific range of Data Link Service qualities possible. This Recommendation|International Standard does not define mechanisms that can be used to optimize or enhance the quality of the Data Link Service. The primary aim of this Recommendation|International Standard is to provide a set of ru
27、les for communication expressed in terms of the procedures to be carried out by peer 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: a) as a guide for implementors and designers; b) fo
28、r use in the testing and procurement of equipment; c) as part of an agreement for the admittance of systems into the open systems environment; d) as a refinement of the understanding of OSI. As it is expected that the initial users of this Recommendation|International Standard will be designers and
29、implementors of equipment, this contains, in notes or in annexes, guidance on the implementation of the procedures defined herein. This Recommendation|International Standard contains a clause on conformance of equipment claiming to implement the procedures in this Recommendation|International Standa
30、rd (see clause 8). 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 OSI protocol. Such a statement is called a Protocol Implementation Conformance Statement (PICS). A PICS proforma is provi
31、ded in Annex A. Attention is drawn to the fact that this Recommendation|International Standard does not contain any tests to demonstrate this conformance. Figure Intro. 1 Relationship between the Network Fast Byte Protocol and adjacent services2 BSI 06-1999 BSISO/IEC 14700:1997 It should be noted th
32、at it may not be possible with current technology to verify that an implementation will operate the protocol defined in this Recommendation|International Standard correctly under all circumstances. It is possible by means of testing to establish confidence that an implementation correctly operates t
33、he protocol in a representative sample of circumstances. It is, however, intended that this Recommendation|International Standard 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. 1 Scop
34、e This Recommendation|International Standard specifies: a) procedures when operating over the connection-mode data link service for the connection-mode transfer of data and control information from one network entity to a peer network entity; b) the structure and encoding of the NPDUs used for the t
35、ransfer of data and control information. The procedures are defined in terms of: a) the interactions between peer network entities through the exchange of NPDUs; b) the interactions between a network entity and the network service user in the same system through the exchange of network service primi
36、tives; c) the interactions between a network entity and the data link service provider through the exchange of data link service primitives. These procedures are applicable to instances of communication between systems which support the Network Layer of the OSI Reference Model and wish to interconne
37、ct in the open systems environment using the Network Fast Byte Protocol. This Recommendation|International Standard specifies, in clause 8, conformance requirements for systems implementing these procedures and provides the PICS proforma in compliance with the relevant requirements, and in accordanc
38、e with the relevant guidance, given in ITU-T Rec. X.296 and ISO/IEC9646-7. It does not contain tests which can be used to demonstrate this conformance. 2 Normative references The following Recommendations and International Standards contain provisions which, through reference in this text, constitut
39、e provisions of this Recommendation|International Standard. At the time of publication, the editions indicated were valid. All Recommendations and International Standards are subject to revision and parties to agreements based on this Recommendation|International Standard are encouraged to investiga
40、te the possibility of applying the most recent edition of the Recommendations and International 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 currently valid IT
41、U-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. ITU-T Recommendation X.210 (1993)|ISO/IEC10731:1994, Information technology Ope
42、n Systems Interconnection Basic Reference Model: Conventions for the definition of OSI services. ITU-T Recommendation X.212 (1995)|ISO/IEC8886:1996, Information technology Open Systems Interconnection Data link service definition. ITU-T Recommendation X.213 (1995)|ISO/IEC8348:1996, Information techn
43、ology Open Systems Interconnection Network Service Definition. ITU-T Recommendation X.233 (1993)|ISO/IEC8473-1:1994, Information technology Protocol for providing the connectionless-mode network service: Protocol specification. ITU-T Recommendation X.263 (1995)|ISO/IEC TR9577., Information technolog
44、y Protocol identification in the Network layer 1) . 1) To be published.BS ISO/IEC 14700:1997 BSI 06-1999 3 2.2 Paired Recommendations|International Standards equivalent in technical contents ITU-T Recommendation X.223 (1993), Use of X.25 to provide the OSI connection-mode network service for ITU-T a
45、pplications. ISO/IEC8878:1992, Information technology Telecommunications and information exchange between systems Use of X.25 to provide the OSI Connection-mode Network Service. ITU-T Recommendation X.290 (1995), OSI conformance testing methodology and framework for protocol Recommendations for ITU-
46、T applications General concepts. ISO/IEC9646-1:1994, Information technology Open Systems Interconnection Conformance testing methodology and framework Part1: General concepts. ITU-T Recommendation X.296 (1995), OSI conformance testing methodology and framework for protocol Recommendations for ITU-T
47、applications Implementation conformance statements. ISO/IEC9646-7:1995, Information technology Open Systems Interconnection Conformance testing methodology and framework Part7: Implementation Conformance Statements. 3 Definitions NOTEThe definitions contained in this clause make use of abbreviations
48、 defined in clause 4. 3.1 This Recommendation|International Standard is based on the concepts developed in ITU-T Rec. X.200|ISO/IEC7498-1 and makes use of the following terms defined in it. a) concatenation and separation; b) segmenting and reassembling; c) multiplexing and demultiplexing; d) splitt
49、ing and recombining; e) flow control; f) connection-mode network service; g) connection-mode data link service. 3.2 For the purposes of this Recommendation|International Standard, the following definitions apply: 3.2.1 equipment hardware or software or a combination of both; it need not be physically distinct within a computer system 3.2.2 local matter a decision made by a system concerning its behavior in the Network Layer that is not subject to the requirements of this protocol 3.2.3 initiator a net
