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1、BRITISH STANDARD BS ISO 4902:1989 Implementation of ISO 4902:1989 Information technology Data communication 37-pole DTE/DCE interface connector and contact number assignments UDC 681.327.8:621.316.541 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy,
2、(c) BSI BS ISO 4902:1989 This British Standard, having been prepared under the direction of the Information Systems Technology Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 December 1990 BSI 12-1999 The following BSI references relate t
3、o the work on this standard: Committee reference IST/6 Draft for comment 89/66666 DC ISBN 0 580 19299 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Commit
4、tee IST/6, upon which the following bodies were represented: Association for Payment Clearing Services British Computer Society British Telecommunications plc Department of Trade and Industry (National Physical Laboratory) EEA (the Electronics and Business Equipment Association) Electricity Supply I
5、ndustry in England and Wales Information Technology Users Standards Association Joint Network Team National Computing Centre Ltd. National Health Services OFTEL (Office of Telecommunications) Post Office Telecommunication Engineering and Manufacturing Association User Standards Forum for Information
6、 Technology (Institute of Data Processing Management) Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 4902:1989 BSI 12-1999i Contents Page Committees responsibleInside front cov
7、er National forewordii Forewordiii Text of ISO 49021 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 4902:1989 ii BSI 12-1999 National foreword This British Standard reproduces verbatim ISO 4902:1989 and implements it as the UK nation
8、al standard. This British Standard supersedes BS 6623-2:1986 which is withdrawn. This British Standard is published under the direction of the Information Systems Technology Standards Policy Committee whose Technical Committee IST/6 has the responsibility to: aid enquirers to understand the text; pr
9、esent 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, a
10、re available from BSI Sales Department, BSI, Linford Wood, Milton Keynes, MK14 6LE. 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 itse
11、lf confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 19 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated.
12、This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 4902:1989
13、 (E) ii BSI 12-1999 Contents Page Forewordiii 1Scope1 2Normative references1 3Definitions1 4Connector2 5Assignment of contact numbers2 6Connector shielding2 7Interconnecting configurations for mixed use of V.10, V.11 and V.28 electrical characteristics2 Annex A (informative) Diagrams for finger clea
14、rance9 Annex B (informative) Generator/receiver interconnecting configurations10 Annex C (informative) Interworking requirements with V.28 circuits12 Figure 1 DTE connector5 Figure 2 DCE connector6 Figure 3 Contact spacing dimensions7 Figure 4 Male contact8 Figure 5 Female contact8 Figure A.1 Maximu
15、m DTE connector outline9 Figure A.2 Minimum DCE connector spacing10 Figure B.1 Generator/receiver interconnecting configurations11 Figure C.1 Data signalling rate and cable length versus risetime14 Figure C.2 Risetime relationship to V.10/V.28 interworking15 Figure C.3 L-pad attenuator for protectio
16、n of V.10 receiver16 Figure C.4 Typical interconnection configurations with basic 37/25-pole adapters17 Figure C.5a) 37/25-pole basic adapter, configuration A18 Figure C.5b) 37/25-pole basic adapter, configuration B19 Table 1 Assignment of contact numbers3 Table 2 Preferred assignment of contact num
17、bers of circuits for national use3 Table 3 List of interchange circuits4 Descriptors: Data processing, data transmission, network interconnection, data communication equipment, connecting equipment, electric connectors, connector pins, multi-contact connectors, specifications, dimensions, layout, nu
18、mbering. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 4902:1989 (E) BSI 12-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
19、of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-government
20、al, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approva
21、l before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 4902 was prepared by Technical Committee ISO/TC 97, Information processing systems. Th
22、is second edition cancels and replaces the first edition (ISO 4902:1980), of which it constitutes a minor revision: certain terms have been aligned with the terms and definitions used by IEC. Annex A, Annex B and Annex C of this International Standard are for information only. Licensed Copy: sheffie
23、ldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 4902:1989 (E) BSI 12-19991 1 Scope This International Standard specifies the 37-pole connector
24、and the assignment of contact numbers at the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) where CCITT1) Recommendation V.24 together with Recommendations V.10 and V.11 are applicable. International Standard ISO 4902 additionally provides the dimensions
25、 of the connector housing, as well as the recommended means of providing a locking device (latching block) and connector shielding. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the ti
26、me of publication, 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 maintai
27、n registers of currently valid International Standards. ISO 261:1973, ISO general purpose metric screw threads General plan. ISO 2110:1980, Data communication 25-pin DTE/DCE interface connector and pin assignments. ISO 4903:1980, Data communication 15-pin DTE/DCE interface connector and pin assignme
28、nts. CCITT Recommendation V.10 (or X.26):1989, Electrical characteristics for unbalanced double-current interchange circuits for general use with integrated circuit equipment in the field of data communications. CCITT Recommendation V.11 (or X.27):1989, Electrical characteristics for balanced double
29、-current interchange circuits for general use with integrated circuit equipment in the field of data communications. CCITT Recommendation V.24:1989, List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE). CCITT Recommendation V
30、.28:1989, Electrical characteristics for unbalanced double-current interchange circuits. CCITT Recommendation V.36:1989, Modems for synchronous data transmission using 60108 kHz group band circuits. CCITT Recommendation V.37:1989, Synchronous data transmission at a data signalling rate higher than 7
31、2 kbit/s using 60108 kHz group band circuits. IEC Publication 50(581):1978, International Electrotechnical Vocabulary Chapter 581: Electromechanical components for electronic equipment. IEC Publication 807-2:1985, Rectangular connectors for frequencies below 3 MHz Part 2: Detail specification for a
32、range of connectors with round contacts Fixed solder contact types. 3 Definitions The following definitions have been taken from IEC Publication 50(581):1978. 3.1 cable adaptor a part of a connector or an accessory consisting of a rigid housing for attachment to the connector body. It may incorporat
33、e provision for a cable clamp or seal for terminating screens and provide shielding from electrical interference. It may be straight or angled 3.2 connector housing a part of a connector into which the insert and contacts are assembled 3.3 contact arrangement the number, spacing and configuration of
34、 contacts in a component 3.4 female contact a contact intended to make electrical engagement on its inner surface and which will accept entry of a male contact 3.5 intermateable connectors two connectors are intermateable when they are capable of being connected electrically and mechanically but wit
35、hout regard to their performance and intermountability 3.6 locking device a feature incorporated in certain components to provide mechanical retention of their mating part 1) International Telegraph and Telephone Consultative Committee. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57
36、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 4902:1989 (E) 2 BSI 12-1999 3.7 male contact a contact intended to make electrical engagement on its outer surface and which will enter a female contact 3.8 (n-pole-)connector a component which terminates conductors for the purpose of providing connect
37、ion and disconnection to a suitable mating component 4 Connector Figure 1 to Figure 5 illustrate the 37-pole connector. Only those dimensions that are essential to mating are shown. Figure 1 illustrates the DTE connector which has 37 male contacts in a connector housing. Figure 2 illustrates the DCE
38、 connector which has 37 female contacts in a connector housing. The connector housing on the DCE connector is dimensioned to fit inside the connector housing on the DTE connector (see Figure 1 and Figure 2). Contact numbering is specified in Figure 1 and Figure 2. Figure 3 illustrates the dimensions
39、 for the contact spacing. Figure 4 and Figure 5 illustrate the dimensions for the male and female contacts respectively. The DCE connector shall be equipped with a locking device consisting of two latching blocks as specified in Figure 2. Due to the fact that the latching blocks have threaded holes
40、which can act as nuts, the DTE connector may be equipped either with lever devices for latching to the latching blocks on the DCE connector or with screws that fit into the threaded holes in the latching blocks. The thread of the latching blocks shall be M3 as specified in Figure 2. Sufficient conne
41、ctor dimensions are provided in this International Standard to ensure intermateable connectors. They are consistent with the detailed connector specification in IEC Publication 807-2. In Annex A, diagrams for finger clearance areas are given to provide guidance for equipment designers. Figure A.1 sh
42、ows the maximum DTE connector outline including all means for latching to the latching blocks. Figure A.2 shows the minimum DCE connector spacing when multiple interface arrangements are used. 5 Assignment of contact numbers The assignment of contact numbers for the selected interchange circuits spe
43、cified in CCITT Recommendation V.24 that may be implemented in modems complying with CCITT Recommendations V.36 and V.37 is given in Table 1. Although Table 1 provides the total list of interchange circuits designated in all the above listed modem CCITT Recommendations, only those interchange circui
44、ts required for the particular equipment need to be implemented. Table 2 shows the preferred assignments of circuits which may be applied for national use. Table 3 gives a list of the applicable interchange circuits used in Table 1 and Table 2 and their description. Additionally, notes 5 and 6 to Ta
45、ble 1 provide preferred assignment of contact numbers for some optional circuits which may be applied for national use. 6 Connector shielding Connector shielding is optional. If it is used, for example due to national regulations, etc., it shall be accomplished by the use of metallic connector housi
46、ngs on both the DTE connector and the DCE connector. 7 Interconnecting configurations for mixed use of V.10, V.11 and V.28 electrical characteristics Considerations for the interworking of equipment implementing V.10 on one side of the interface with equipment implementing V.11 on the other side of
47、the interface are given in Annex A, clause A.2 of CCITT Recommendations V.10 and V.11. In addition, the definition of the category 1 and 2 receiver configurations is provided in V.10. Guidance concerning possible interconnecting configurations applicable to V.28 interfaces is provided in Annex B. Gu
48、idance concerning the necessary adaptation when there is a need for a DTE or DCE implementing V.10 characteristics to interwork with a DCE or DTE implementing V.28 characteristics is given in Annex C. Any adapters required to accomplish the interworking with V.28 and ISO 2110 shall be provided with
49、equipment meeting the requirements of this International Standard. No revisions or modifications shall be required in the existing equipment using V.28 electrical characteristics. The Annex C interworking between V.10 and V.28 characteristics is not required in CCITT Recommendations V.36 and V.37. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 4902:1989 (E) BSI 12-19993 Table 1 Assignment of contact numbers Table 2 Preferred assignment of contact number
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