ISO INTERNATIONAL STANDARD 4903 Second edition 1989-10-01 Information technology - Data communication 15-pole DTE/DCE interface connector and contact number assignments Technologies de I'information -- Communicationdedonnees- Connecteur d'interface ETTD/ETCD a 15 poles et affectation des numeros de contact Reference number ISO 4903 : 1989 (E) Provided by IHS under license with ISO ISO 4903 : 1989 (E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work 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, govern- mental and non-governmental,in liaisonwithIsO,also take part inthework.Iso collaborates closely withtheInternational ElectrotechnicalCommission(lEC)on all mattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council., They are approved in accordance with ISO procedures requiring at International Standard ISO 4903 was prepared by Technical Committee ISO/TC 97, Informationprocessing systems. This second edition cancels and replaces the first edition (ISO 4903 : 1980), of which it constitutes a minor revision; certain terms have been aligned with the terms and defi- nitions used by IEC. ?ISO 1989 Allrights reserved. No part of this publication may be reproduced or utilized in any form or by any writing from the pubisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland Provided by IHS under license with ISO INTERNATIONALSTANDARD ISO 4903 : 1989 (E) Information technology - Data communication - 15-pole DTE/DCE interface connector and contact number assignments Scope CCITT Recommendation X.22 : 1989, Multiplex DTE/DCE interface for user classes 3-6. This International Standard specifies the 15-pole connector and the assignment of contact numbers at the interface between CCITT Recommendation X.24 : 1989, List of definitions for data terminal equipment (DTE) and data circuit-terminating interchangecircuitsbetweendataterminalequipment(DTE) equipment (DCE) where CCITT1) Recommendations X.24, and data circuit-terminating equipment (DCE) on public data X26,andX.27areapplicable. network. International Standard ISO/IEC 4903 additionally provides the CCITT Recommendation X.26 (or V.10) : 1989, Electrical dimensions of the connector housing, as well as the recom- characteristics forunbalanced double-current interchange cir- mended means of providinga lockingdevice (latching block) cuits for general use with integrated circuit equipment in the and connector shielding. field of data communications. CCITT Recommendation X.27 (or V.11) : 1989, Electrical 2 Normative references characteristics for balanced double-current interchange circuits forgeneralusewith integratedcircuitequipment inthefieldof The following standards contain provisions which, through datacommunications. reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated IEC Publication 50(581) : 1978, International Electrotechnical werevalid.All standards are subjecttorevision,and partiesto Vocabulary Chapter 581 : Electromechanical components agreements based on this International Standard are encour- forelectronicequipment. aged to investigate the possibilityof applying themost recent editions of the standards indicated below. Members of IEC and IEC Publication 807-2 : 1985, Rectangular connectors for fre ISo maintain registers of currently valid International Stan- quenciesbelow3MHz Part2:Detail specification fora dards. range of connectors with round contacts-
ISO 4903 1989 Information technology — Data communication — 15-pole DTE DCE interface connector and contact number assignments
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