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1、BRITISH STANDARD BS ISO/IEC 11575:1995 Implementation of BS ISO/IEC 11575:1995 Information technology Telecommunications and information exchange between systems Protocol mappings for the OSI Data Link service ICS 35.100.20 UDC 681.3:621.39 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:3
2、1:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 11575:1995 This British Standard, having been prepared under the direction of the Information Systems Technology Assembly, was published under the authority of the Standards Board and comes into effect on 15 December 1995 BSI 01-2000 The fol
3、lowing BSI references relate to the work on this standard: Committee reference IST/6 Draft for comment 92/68500 DC ISBN 0 580 24890 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee IST/6, Data Communications, upon which
4、the following bodies were represented: British Computer Society British Telecommunications plc CCTA (the Government Centre for Information Systems) Digital Equipment Co. Ltd. Institution of Electrical Engineers International Computers Limited Nine Tiles Computer Systems Ltd. Rank Xerox (UK) Ltd. Co-
5、opted members Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 11575:1995 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii Forewordiii
6、Text of ISO/IEC 115751 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 11575:1995 ii BSI 01-2000 National foreword This British Standard reproduces verbatim ISO/IEC 11575:1995 and implements it as the UK national standard. This Br
7、itish Standard is published under the direction of the Information Systems Technology Assembly 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 for change,
8、 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, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does n
9、ot 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 front cover, an inside
10、front cover, pages i and ii, the ISO/IEC title page, pages ii to iv, pages 1 to 15 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 Copy: sheffieldun sheff
11、ieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 11575:1995 (E) ii BSI 01-2000 Contents Page Forewordiii 1Scope1 2Normative references1 3Definitions2 4Abbrevia
12、tions2 5Conformance3 6General principles of the protocol mappings3 7Protocol mapping for ISO/IEC 7776 single link procedures6 8Protocol mapping for HDLC Unbalanced operation Normal response mode Class (UNC)8 9Protocol mappings for LLC Types 1 and 211 10Protocol mappings for HDLC connectionless-mode
13、classes of procedure14 Figure 1 Model of Data Link service provision3 Figure 2 Structure of DLS provider4 Figure 3 Types of data link configuration5 Table 1 Mapping between principal ISO/IEC 7776 SLP protocol functions and CO-DLS features6 Table 2 Mapping between primitives and ISO/IEC 7776 frames a
14、t DLC establishment7 Table 3 Mapping between primitives and ISO/IEC 7776 frames, etc., at DLC release7 Table 4 Mapping between primitives and ISO/IEC 7776 frames for DLC reset8 Table 5 Mapping between principal HDLC UNC protocol functions and CO-DLS features9 Table 6 Mapping between primitives and H
15、DLC UNC frames at DLC establishment9 Table 7 Mapping between primitives and HDLC UNC frames, etc., at DLC release10 Table 8 Mapping between primitives and HDLC UNC frames for DLC reset11 Table 9 Mapping between principal LLC Type 2 protocol functions and CO-DLS features12 Table 10 Mapping between pr
16、imitives and LLC Type 2 PDUs at DLC establishment12 Table 11 Mapping between primitives and LLC Type 2 PDUs, etc., at DLC release13 Table 12 Mapping between primitives and LLC Type 2 PDUs for DLC reset14 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Cop
17、y, (c) BSI ISO/IEC 11575:1995 (E) BSI 01-2000iii 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 participate in the deve
18、lopment 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 and non-governme
19、ntal, 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 circulated to national bodies for voting. Publica
20、tion as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 11575 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00
21、2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 11575:1995 (E) BSI 01-20001 1 Scope This International Standard specifies general principles for the mappings between the OSI Data Link service
22、 (ISO/IEC 8886), both connection-mode (CO-DLS) and connectionless-mode (CL-DLS), and standard Data Link protocols, as follows: This International Standard specifies the detailed mappings M1, M2, M5 and M6; it also specifies the main features of the mappings M3 and M4. This International Standard doe
23、s not specify individual implementations or products, nor does it constrain the implementation of Data Link entities and interfaces within an information processing system. NOTE 1The above designations M1 to M6 for the mappings are used elsewhere in this International Standard. NOTE 2The possibility
24、 of adding further mappings to the above list in the future is not precluded (for example, to cover Frame Relay protocols). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of pu
25、blication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain regist
26、ers of currently valid International Standards. ISO/IEC 3309:1993, Information technology Telecommunications and information exchange between systems High-level data link control (HDLC) procedures Frame structure. ISO/IEC 4335:1993, Information technology Telecommunications and information exchange
27、between systems High-level data link control (HDLC) procedures Elements of procedures. ITU-T Recommendation X.200 (1994)|ISO/IEC 7498-1:1994, Information technology Open Systems Interconnection Basic Reference Model: The basic model. ISO/IEC 7776:1995, Information technology Telecommunications and i
28、nformation exchange between systems High-level data link control procedures Description of the X.25 LAPB-compatible DTE data link procedures. ISO/IEC 7809:1993, Information technology Telecommunications and information exchange between systems High-level data link control (HDLC) procedures Classes o
29、f procedures. ISO/IEC 8802-2:1994, Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements Part 2: Logical link control. ISO/IEC 8886:1992, Information technology Telecommunications and information exchange between
30、 systems Data Link service definition for Open Systems Interconnection. ITU-T Recommendation X.210 (1993)|ISO/IEC 10731:1994, Information technology Open Systems Interconnection Basic Reference Model Conventions for the definition of OSI services. M1:CO-DLS HDLC X.25 LAPB-compatible DTE procedures,
31、single link procedures (ISO/IEC 7776) M2:CO-DLS HDLC Unbalanced operation Normal response mode Class, UNC (ISO/IEC 3309, ISO/IEC 4335 and ISO/IEC 7809) M3:CO-DLS Logical link control (LLC) Type 2 (ISO/IEC 8802-2) M4:CL-DLS LLC Type 1 (ISO/IEC 8802-2) M5:CL-DLS HDLC Balanced operation Connectionless-
32、mode Class, BCC (ISO/IEC 3309, ISO/IEC 4335 and ISO/IEC 7809) M6:CL-DLS HDLC Unbalanced operation Connectionless-mode Class, UCC (ISO/IEC 3309, ISO/IEC 4335 and ISO/IEC 7809) Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 11575:1995
33、 (E) 2 BSI 01-2000 3 Definitions 3.1 This International Standard uses the following terms defined in ITU-T Rec. X.200|ISO/IEC 7498-1: DL-address DL-connection DL-connectionless-mode transmission DL-entity DL-group address DL-layer DL-protocol-data-unit DL-service access point DL-service access point
34、 address DL-service-data-unit DL-subsystem 3.2 This International Standard uses the following terms defined in ITU-T Rec. X.210|ISO/IEC 10731: DLS provider DLS user primitive request (primitive) indication (primitive) response (primitive) confirm (primitive) 3.3 For the purposes of this Internationa
35、l Standard, the following definitions apply: 3.3.1 frame a DL-PDU 3.3.2 instance of DL-communication a DL connection or a single DL-connectionless-mode transmission 4 Abbreviations BCCbalanced operation connectionless-mode class CLconnectionless-mode COconnection-mode DISCdisconnect DLData Link DLCD
36、ata Link connection DLSData Link service DLSAPData Link service access point DLSDUData Link service data unit DMdisconnected mode FRMRframe reject HDLCHigh-level data link control Iinformation LLCLogical Link Control NRMnormal response mode PDUprotocol data unit QOSquality of service SABMset asynchr
37、onous balanced mode SABMEset asynchronous balanced mode extended Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 11575:1995 (E) BSI 01-20003 5 Conformance There is no direct conformance of equipment to this International Standard con
38、sidered in isolation. The provisions of this International Standard have normative application to equipment implementing Network-layer protocols that are specified in terms of their use of the OSI Data Link service. For such Network-layer protocols, this International Standard links the behaviour of
39、 the underlying Data Link protocols to the relevant features of the Data Link service, and thus provides the basis for establishing conformance of the Network-layer protocol implementations to the specified usage of the Data Link layer. NOTE 1This International Standard therefore functions as “glue”
40、 between Network-layer protocol standards, written in terms of their use of the OSI Data Link service, and Data Link protocol standards written usually for historical reasons without reference to the OSI Data Link service. Conformance to such a Data Link protocol standard will be expressed entirely
41、in terms of the procedures and PDUs, etc., specified in that standard; conformance to such a Network-layer standard in respect of its use of the Data Link layer will be expressed in terms of, for example, the transfer of NPDUs as DLSDUs, and (for the CO-DLS) of procedures that apply in the event of
42、DL connection reset or DL connection release. This International Standard specifies precisely how the procedures, etc., of the Data Link protocol in question are to be interpreted in terms of the OSI Data Link Service, and therefore establishes a precise relationship between the specifications of th
43、e Network-layer protocol and of the Data Link protocol. NOTE 2Use of the OSI Data Link service in Network-layer protocol specifications offers the benefits of layer-independence, in that such a Network-layer specification is available, without change, for use over new or alternative Data Link techno
44、logies, provided only that the appropriate mapping is specified between the OSI Data Link service and the relevant Data Link technology. 6 General principles of the protocol mappings 6.1 Data Link architecture The OSI Data Link service defines the properties of individual instances of DL-communicati
45、on between pairs of DLS users. The definition is abstractly expressed in terms of primitives and parameters exchanged, at Data Link service access points (DLSAPs), between each DLS user and a single DLS provider: this is illustrated in Figure 1. Operation of the DLS provider is modelled in terms of
46、the exchange of DL-PDUs, in accordance with DL-protocols, between DL-entities (Figure 2). Each DLSAP is attached to a unique DL-entity; a given DL-entity can have one or more DLSAPs attached to it, depending upon system configuration and the nature of the underlying DL-protocols. When real equipment
47、 is considered, a data link consists of two or more stations communicating according to a particular DL-protocol or set of related DL-protocols, together with the interconnecting media supporting information exchange among the stations. Possible configurations of a real data link (see Figure 3) incl
48、ude: a) point-to-point data links, with just two stations (mappings M1 and M5 are for protocols used in data links of this type); b) centralized multipoint data links, with one station controlling communication between itself and a number of subsidiary stations (mappings M2 and M6 are for protocols
49、used in data links of this type); SLPsingle link procedure SNRMset normal response mode SNRMEset normal response mode extended UAunnumbered acknowledgement UCCunbalanced operation connectionless-mode class UIunnumbered information UNCunbalanced operation normal response mode class Figure 1 Model of Data Link service provision Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:31:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 11575:1995 (E) 4 BSI 01-2000 c) dis