ISO/IEC INTERNATIONAL STANDARD 8482 Second edition 1993-12-15 Information technology Telecommunications and information exchange between systems Twisted pair multipoint interconnections Technologies de I'information --- Télécommunications et échange d'informations entre systemes Interconnexions multipoints par paire torsadée IEO ISO Reference number > ISO/IEC 8482:1993(E) Copyright Intermational Organization for Standardization rmitted without license from IHS Not for Resale ISO/IEC 8482:1993(E) Foreword ISO (the International Organization for Standardization) and IEC (the Inter- national Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IsO or IEC participate in the development of International Standards through with particular fields of technical activity. ISO and IEc technical com- mittees collaborate in fields of mutual interest. Other international organ- 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 vot- ing. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 8482 was prepared by Joint Technical Committee ISO/IEC JTC.1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems This second editioncancelsandreplaces thefirst edition (ISO 8482:1987), which has been technically revised. AnnexesAandBof thisInternationalStandardareforinformationonly ISO/IEC1993 or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office · Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland 11 No reproduction or networking permited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO/IEC 8482:1993(E) Information technology Telecommunications and information exchange between systems Twisted pair multipoint interconnections 1 Scope . mode of synchronous or asynchronous trans- mission; 1.1 This International Standard specifies the - signal quality for transmission and reception. physical medium characteristics for 1.4 This International Standard does not specify - twisted pair multipoint interconnections in either 2-wire or 4-wire network topology in order to provide special environmental conditions, such as galvanic for half duplex or duplex data transmission capability, isolation, electromagnetic interference (EMl), radio respectively; frequency interference (RFl), and human safety. This may form the subject of a future amendment. - a binary and bi-directional signal transfer of the 1.5 This International Standard is primarily a interconnected endpoint systems; componentspecification.Itisnotsufficiently - the electrical and mechanical design of the endpoint specifiedforsatisfactoryinteroperationinallpossible system branch cables and the common trunk cable, configurations. It is the responsibility of implementors which may be up to 1 200 m in length; to ensure that their intended configuration will allow satisfactory interoperation. - the component measurements of the integrated circuit type generators and receivers within the 1.6 This International Standard may be com- bined with any appropriate set of functional and endpoint systems; additional environmental characteristics so as to - the applicable data signalling rate up to 12,5 Mbit/s meet the practical data transmission requirements in the field of local or wide area networks. 1.2 The defined electrical component charac- 2 teristics and measurements are in close conformance Normative reference with the twisted pair point-to-point characteristics given in ITU-T Recommendation V.11. The following ITU-T Recommendation contains