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 681.327.8:621.316.541BS ISO4902:1989 This British Standard, having been prepared under the directionof the Information Sy
2、stems Technology StandardsPolicy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31December1990 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference IST/6 Draft for comment 89/66666 DC ISBN 0 580 19299 7 Committees r
3、esponsible for this British Standard The preparation of this British Standard was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Committee IST/6, upon which the following bodies were represented: Association for Payment Clearing Services British Compu
4、ter Society British Telecommunications plc Department of Trade and Industry (National Physical Laboratory) EEA (the Electronics and Business Equipment Association) Electricity Supply Industry in England and Wales Information Technology Users Standards Association Joint Network Team National Computin
5、g Centre Ltd. National Health Services OFTEL (Office of Telecommunications) Post Office Telecommunication Engineering and Manufacturing Association User Standards Forum for Information Technology (Institute of Data Processing Management) Amendments issued since publication Amd. No. Date CommentsBS I
6、SO4902:1989 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iii Text of ISO 4902 1BS ISO4902:1989 ii BSI 12-1999 National foreword This British Standard reproduces verbatim ISO4902:1989and implements it as the UK national standard. This British Sta
7、ndard supersedes BS6623-2:1986which is withdrawn.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; present to the responsible intern
8、ational 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 available from BSI Sales Dep
9、artment, 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 itself confer immunity from legal o
10、bligations. 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. This will be indicated in the a
11、mendment table on the inside front cover.ISO4902:1989(E) ii BSI 12-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Connector 2 5 Assignment of contact numbers 2 6 Connector shielding 2 7 Interconnecting configurations for mixed use of V.10, V.11 and V.28 electric
12、al characteristics 2 Annex A (informative) Diagrams for finger clearance 9 Annex B (informative) Generator/receiver interconnecting configurations 10 Annex C (informative) Interworking requirements with V.28 circuits 12 Figure 1 DTE connector 5 Figure 2 DCE connector 6 Figure 3 Contact spacing dimen
13、sions 7 Figure 4 Male contact 8 Figure 5 Female contact 8 Figure A.1 Maximum DTE connector outline 9 Figure A.2 Minimum DCE connector spacing 10 Figure B.1 Generator/receiver interconnecting configurations 11 Figure C.1 Data signalling rate and cable length versus risetime 14 Figure C.2 Risetime rel
14、ationship to V.10/V.28 interworking 15 Figure C.3 L-pad attenuator for protection of V.10 receiver 16 Figure C.4 Typical interconnection configurations with basic 37/25-pole adapters 17 Figure C.5a) 37/25-pole basic adapter, configuration A 18 Figure C.5b) 37/25-pole basic adapter, configuration B 1
15、9 Table 1 Assignment of contact numbers 3 Table 2 Preferred assignment of contact numbers of circuits for national use 3 Table 3 List of interchange circuits 4 Descriptors: Data processing, data transmission, network interconnection, data communication equipment, connecting equipment, electric conne
16、ctors, connector pins, multi-contact connectors, specifications, dimensions, layout, numbering.ISO4902:1989(E) BSI 12-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internati
17、onal 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-governmental, in liaison with IS
18、O, 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 approval before their accepta
19、nce as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least75% approval by the member bodies voting. International Standard ISO4902was prepared by Technical Committee ISO/TC 97, Information processing systems. This second edition cancels
20、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.iv blankISO4902:1989(E) BSI 12-1999 1 1 Scope Thi
21、s International Standard specifies the 37-pole connector and the assignment of contact numbers at the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) where CCITT 1)Recommendation V.24 together with Recommendations V.10 and V.11 are applicable. Internation
22、al Standard ISO4902additionally provides the dimensions 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, constitu
23、te provisions of this International Standard. At the time 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
24、 standards listed below. Members of IEC and ISO maintain 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 communicat
25、ion 15-pin DTE/DCE interface connector and pin assignments. 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.2
26、7):1989, Electrical characteristics for balanced double-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 circ
27、uit-terminating equipment (DCE). CCITT Recommendation V.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 da
28、ta transmission at a data signalling rate higher than 72 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 freq
29、uencies below 3 MHz Part 2: Detail specification for a 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
30、for attachment to the connector body. It may incorporate 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 conta
31、ct arrangement the number, spacing and configuration of 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 o
32、f being connected electrically and mechanically but without 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.ISO4902:1
33、989(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 connection and disconnection to a suitable mating component 4
34、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 has37male contacts in a connector housing. Figure 2 illustrates the DCE connector which has37female contacts in a connector hous
35、ing. 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 for the contact spacing. Figure 4 and Figure 5 illustrate
36、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 which can act as nuts, the DTE connector may be equipped ei
37、ther 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 connector dimensions are provided in this International Standard
38、 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 shows the maximum DTE connector outline including all means f
39、or 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 specified in CCITT Recommendation V.24 that may be implemented
40、 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 circuits required for the particular equipment need to be impleme
41、nted. 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, notes5and6to Table 1 provide preferred assignment of contact numbers for some
42、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 housings on both the DTE connector and the DCE connector. 7 Intercon
43、necting 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 the interface are given in Annex A, clause A.2 of CCITT Recomme
44、ndations V.10 and V.11. In addition, the definition of the category1and2receiver configurations is provided in V.10. Guidance concerning possible interconnecting configurations applicable to V.28 interfaces is provided in Annex B. Guidance concerning the necessary adaptation when there is a need for
45、 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 ISO2110shall be provided with equipment meeting the requirements of this InternationalStandard. No
46、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.ISO4902:1989(E) BSI 12-1999 3 Table 1 Assignment of contact numbers Tabl
47、e 2 Preferred assignment of contact numbers of circuits for national use First segment assignment 2) Second segment assignment 2) Receiver category 4) Direction to Contact number Circuit number Interchange points 3) Contact number Circuit number Interchange points DTE DCE 1 1) 2 N A-A 20 102b C-B 2
48、X 3 N A-A 21 N B/C-B 1 X 4 103 A-A 22 103 B/C-B 1 X 5 114 A-A 23 114 B/C-B 1 X 6 104 A-A 24 104 B/C-B 1 X 7 105 A-A 25 105 B/C-B 1 X 8 115 A-A 26 115 B/C-B 1 X 9 106 A-A 27 106 B/C-B 1 X 10 141 A-A 28 N A-A 2 X 11 107 A-A 29 107 B/C-B 1 X 12 108* A-A 30 108* B/C-B 1 X 13 109 A-A 31 109 B/C-B 1 X 14
49、140 A-A 32 N A-A 2 X 15 N A-A 33 N A-A 2 X 16 111 A-A 34 N A-A 2 X 17 113 A-A 35 113 B/C-B 1 X 18 142 A-A 36 N A-A 2 X 19 102 C-C 37 102a C-B X Key: N Contact permanently reserved for national use. * Circuit 108/1 or circuit 108/2 (if one of them is provided). NOTES 1Contact1 is assigned for connecting the shields between tandem sections of the shielded interface cable. The shield may be connected either to protective ground or to signal ground at either the DTE or DCE or
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