1、Telecontrol equipment and systems Part 6. Telecontrol protocols compatible with IS0 standards and ITU-T recommendations Section 2. Use of basic standards (OS1 layers 1-4) The European Standard EN 6087W2 : 1995 has the status of a British Standard ICs 33.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT A
2、S PERMITTED BY COPYRIGHT LAW iOS70-6-2 : 1996 1995 EC 870-6-2 : CENELEC EN*b0*870-b- 2 95 m 3404583 017b523 497 m Amd. No. Date BS EN 60870-6-2 : 1996 Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PEU57, P
3、ower system control and associated communications, upon which the following bodies were represented: Association of Consuiting Engineers BEAMA Ltd. BEAMA Metering Association MA) EEA (Association of Electronics, Telecommunications and Business Equipment Electricity Association GAMBICA (BEAMA La.) Tr
4、ansmission and Distribution Association (BEAMA Ltd.) Industries) This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1996 O SI 1996 The following BSI referenc
5、es relate to the work on this Standard: Committee reference PEU57 DraR for comment gol25650 DC ISBN O 580 25636 7 CENELEC EN*b*870-b- 2 95 = 3404583 0376524 323 BS EN 60870-6-2 : 1996 Contents page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 6087W2 3 O BSI 19
6、96 i CENELEC EN*b0*870-b- 2 95 3404583 017b525 2bT BS EN 60870-6-2 : 1996 National foreword This British Standard has been prepared by Technical Committee PEL457 and is the English ianguage version of EN 60870-6-2 : 1995 Telecontrol equipment and systems Part 6: Telecontrol protocols compatible with
7、 IS0 standards and ITU-T recomtions Section 2: Use of basic standad (OSI layers 1-4) published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 870-6-2 : 1995 published by the International Electrotechnica Commission (iEC). Cross-references Publicati
8、on referred to IEC 50(371) : 1984 IEC 50(721) : 1991 IEC 870-1-3 : 1990 IS0 2110 : 1989 IS0 2382-9 : 1984 ISO/IEC 3309 : 1993 ISO/IEC 4335 : 1993 IS0 4903 : 1989 IS0 7776 : 1986 ISOLEC 7809 : 1993 ISO/IEC 8072 : 1994 EN 28073 : 1993 (ISO/IEC 8703 : 1992) ISO/IEC 8208 : 1990 ISOAEC 8348 : 1993 IS0 86
9、02 : 1987 Corresponding British Standard BS 4727 Glossary of electrotechnicd, poww, telecommunication, electronics, lighting, and colour terms Part 2 Terms particular to power engineering Group 12 : 1990 Telecontrol terminology Part 3 Tm particular to telecommunications and electronics Group 03 : 19
10、92 Tkgraphy, facsimile and data communication BS 7404 Telecontrol equipment and sgstems Part 1 Gentmi considemtions Section 1.3 : 1991 Glossary BS IS0 2110 : 1989 Information technology. Data communications. 25-pole D7EmCE intqfce connector and contact number assignments BS IS0 2382 Infomurtion tech
11、nology, Vocabula.y Part 9 1 1984 Data communication BS ISOAEC 3309 : 1993 Inf0mu;ction technology. T 1990 Provision and support of the connectms-mode Network S 1991 Information technology. Telecommunications and information exchunge between systems. Network %nsport Protocol interworking spec - to li
12、st the relevant IS0 basic standards; - to give general considerations and recommendations for the use of the standards in the application context of part 6. The use of these standards in their application to end systems (ES) and intermediate systems (IS) is described. An ES is one which contains all
13、 seven layers of the OS1 reference model as well as an application process. An IS is a communication relay between sub-networks. ESs and ISS are considered in IEC 870-1 -4 and IEC 870-6-1. The description of the functions carried out by each layer is intended to be fairly complete but makes no claim
14、 to being exhaustive. For more details, the relevant sections of IS0 7498 should be consulted as well as the listed IS0 basic standards. Second, the IS0 standards listed are the fundamental ones related to each layer; again, the list does not claim to be exhaustive. Finally, the general consideratio
15、ns and recommendations are intended to present the basic issues involved in the application of the standards and to lay down the fundamental manner in which they are to be used. The purpose is to codify the ground rules for making the specific comprehensive and detailed choices necessary for the def
16、inition of the functional profiles which are the subject of part 6-5 and subsequent parts. This section is organized according to the OS1 layers. Because there is a strong interdependence in the choice of protocols in the three lowest layers, these layers are grouped into clauses of this section. Wi
17、thin these clauses, the organization is according to the type of transmission network. The treatment of each layer contains the following elements: - introduction: briefly describing the layers function and role in the overall communication process; - reference documents; - services; 0 list of servi
18、ces and QOS parameters included in the standards; O guidelines and recommendations concerning the choice and use of these services; - protocols; O list of protocol classes, subsets, etc. included in the relevant standards; O guidelines and recommendations concerning the choice and use of these proto
19、cols. CENELEC EN*b0*870-6- 2 95 3Y04583 OL7653L 563 Page 5 EN 60870-6-2 : 1995 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this section of IEC 870-6. At the time of publication, the editions indicated wer
20、e valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC 870-6 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently
21、 valid International Standards. IEC 50(371): 1984, Intemational Electrotechnical Vocabulary (IEV) - Chapter 371: Telecontrol IEC 50(721): 1991 , Intemational Electtotechnical Vocabulary (lEV) - Chapter 721: Te/egraphy, facsimile and data communication IEC 870-1-3: 1990, Telecontrol equipment and sys
22、tems - Part 1: General considerations - Section 3: Glossary IEC 870-6-1 : 1994, Telecontrol equipment and systems - Part 6: Telecontrol protocols compatible with IS0 standards and ITU-T recommendations - Section 1: Application contexf and organization of standards IS0 2110: 1989, Information technol
23、ogy - Data communication - 25-pole DTEDCE interface connector and contact number assignments IS0 2382-9: 1984, Data processing - Vocabulary - Part 09: Data communication ISOAEC 3309: 1 993, Information technology - Telecommunications and information exchange between systems - High-level data link co
24、ntrol (HDLC) procedures - Frame structure ISO/I EC 4335: 1 993, Information technology - Telecommunications and information exchange between systems - High-level data link control (HDLC) procedures - Elements of procedures IS0 4903: 1989, Information technology - Data communication - 15-pole DTEDCE
25、interface connector and contact number assignments ISO/IEC 7498-1 : 1994, Information technology - Open Systems Interconnection - Reference Model - Part 1: Basic Reference Model IS0 7776: 1986, Infomation processing systems - Data communications - High-level data link control procedures - Descriptio
26、n of the X.25 LAPBampatible DE data link procedures ISOA EC 7809: 1 993, Information technology - Telecommunications and information exchange between systems - High-level data link control (HDLC) procedures - Classes of procedures ISOAEC 8072: 1994, Information technology - Open Systems Interconnect
27、ion - Transport service definition ISO/IEC 8073: 1 992, Information technology - Telecommunications and information exchange between systems - Open Systems Interconnection - Protocol for providing the connection-mode transport service ISO/IEC 8208: 1990, Information technology - Data communications
28、- X.25 Packet Layer Protocol for Data Terminal Equipment CENELEC EN*bO*7-b- 2 95 = 3404583 0176532 4TT m Page 6 EN 60870-6-2 : 1995 ISOYIEC 8348: 1993, Information technology - Open Systems Interconnection - Network service Definition ISO/IEC 8473-1 : 1 994, Information technology - Protocol for pro
29、viding the connectionless-mode network service: Protocol specification IS0 8602: 1987, Information processing systems - Open Systems Interconnection - Protocol for providing the connectionless-mode transport service IS0 8648: 1988, Information processing systems - Open Systems Interconnection - Inte
30、rnal organization of the Network Layer IS0 8802-2: 1989, Information processing systems - Local area networks - Part 2: Logical link control ISO/IEC 8878: 1 992, Information technology - Telecommunications and information exchange between systems - Use of X.25 to provide the OS1 Connection-Mode Netw
31、ork Service ISOAEC 8880-2: 1 992, Information technology - Telecommunications and information exchange between systems - Protocol combinations to provide and support the OS1 Network Service - Part 2: Provision and support of the connection-mode Network Service ISO/IEC 8880-3: 1 990, Information tech
32、nology - Telecommunications and information exchange between systems - Protocol combinations to provide and support the OS1 Network Service - Part 3: Provision and support of the connectionless-mode Network Service ISOAEC 8886: 1 992, Information technology - Telecommunications and information excha
33、nge between systems - Data link service definition for Open System Interconnection ISO/IEC 10022: 1990, Infomation technology - Open Systems Interconnection - Physical Service Definition ISOAEC TR 1 O1 72: 1991, Information technology - Telecornmunications and information exchange between systems -
34、Network Transport Protocol interworking specifcation ITU-T T.5009: 1 992, International Reference Alphabet ITU-T V. 1 O: 1 993, Electrical characteristics for unbalanced double-current interchange circuits operating at data signalling rates nominally up to 100 kbilds ITU-T V.ll: 1 993, Electrical ch
35、aracteristics for unbalanced double-current interchange circuits operating at data signalling rates up to 10 MbiVs ITU-T V.21: 1988, 300 bits per second duplex modem standardized for use in the general switched telephone network ITU-T V.22: 1988, 1200 bits per second duplex modem standardized for us
36、e in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits ITU-T V.22bis: 1988, 2400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased tel
37、ephone-type circuits CENELEC EN*b*70-b- 2 9.5 3404583 OL7b533 336 Page 7 EN 60870-6-2 : 1995 ITU-7 V.23: 1988, 600/7200-baud modem standardized for use in the general switched telephone network ITU-T V.24: 1993, List of definitions for interchange circuits between data terminal equipment (DE) and da
38、ta circuit-terminating equipment (DCE) ITU-T V. 25: 1988, Automatic answering equipment and/or parallel automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically established calls ITU-T V.25bis
39、: 1988, Automatic calling anaor answering equipment on the general switched telephone network (GSTN) using the 7 00-series interchange circuits ITU-T V.26bis: 1988, 2400/7200 bits per second modem standardized for use in the general switched telephone network ITU-T V.2ter: 1988, 2400 bits per .secon
40、d duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits ITU-T V.27: 1988, 4800 bits per second modem with manual equalizer standardized for use on leased telephone-type circuits IT
41、U-T V.28: 1 993, Electrical characteristics for unbalanced double-curent interchange circuits ITU-T V.31: 1988, Electrical characteristics for single-curent interchange circuits controlled by contact closure iTU-T V.31 bis: 1988, Electrical characteristics for single-cumnt interchange cimuh using op
42、tocouplers ITU-T V.32: 1993, A family of Fwire, duplex modems operating at data signalling rates of up to 9600 bit notation used by the data link and transport layers (see IEC 870-1-4). CENELEC EN*bO*670-6- 2 95 = 3404563 0376539 854 Page 13 EN 60870-6-2 : 1996 4 Abbreviations CLNS CLTS CONS COTS CS
43、DN CSPDN HDLC ISDN LAN M LP NC NPDU NSAP NSDU PLP PSDN PSPDN PSTN QOS SLP SNAcP SNDCP SNICP STE STN TC TPDU TSDU Connectionless-mode Network Service Connectionless-mode Transport Service Connection-mode Network Service Connection-mode Transport Service Circuit switched data network Circuit switched
44、public data network High Level Data Link Control Integrated Services Digital Network Local Area Network Multi Link Procedure Network Connection Network Protocol Data Unit Network Service Access Point Network Service Data Unit Packet Level Protocol Packet Switched Data Network Packet Switched Public
45、Data Network Public Switched Telephone Network Quality of Service Single Link Procedure Sub-network Access Protocol Sub-network Dependent Convergence Protocol Siib-network Independent Convergence Protocol Signal Terminating Equipment Switched Telephone Network Transport Connection Transport Protocol
46、 Data Unit Transport Service Data Unit CENELEC EN*bO*dO-b- 2 95 3404583 0376.540 576 m Page 14 EN 60870-6-2 : 1995 5 Transport layer 5.1 General presentation of the transport layer 5.1.1 Introduction The transport layer is layer 4 of the OS1 reference model (see ISO/IEC 7498-1). It is the border bet
47、ween the upper layers (5, 6, 7) which are appiication-oriented, and the lower layers (1, 2, 3) which are network-dependent. The main purpose of the transport layer is to provide to the application-oriented layers a transparent, reliable and efficient end-to-end transport of information, associated w
48、ith a specified quality of service. The objective of the transport layer is to provide this service (reliable transport of information) independently of the network) used. 5.1.2 Function of the transport layer The detailed functions of the transport layer are: - mapping transport-address on to netwo
49、rk-address; - establishment and release of transport-connections end-to-end; - end-to-end flow control and sequence control; - multiplexing/demultiplexing of transport connections on a single network connection; - splitting and recombining: function used to assign several network connections to a single transport connection; - error detection, recovery, and monitoring quality of service; - segmenting and reassembling, blocking and unblocking: functions used to adapt the length of the transport service data units (TSDUs), e.g. messages delivered by the session layer, to the
