IEC_PAS_61156-1-4-2010.pdf

IEC/PAS 61156-1-4Edition 1.0 2010-06PUBLICLY AVAILABLE SPECIFICATIONPRE-STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 1-4:Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Conductor heating of bundled data grade cables for limited power transmission based on IEEE 802.3 IEC/PAS 61156-1-4:2010(E)colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.?Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.?Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.?Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.IEC/PAS 61156-1-4Edition 1.0 2010-06PUBLICLY AVAILABLE SPECIFICATIONPRE-STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 1-4:Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Conductor heating of bundled data grade cables for limited power transmission based on IEEE 802.3 INTERNATIONAL ELECTROTECHNICAL COMMISSION XICS 33.120.20 PRICE CODEISBN 978-2-88912-032-1 Registered trademark of the International Electrotechnical Commission colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 PAS 61156-1-4 IEC:2010(E)CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.8 3 Terms,definitions,symbols,units and abbreviated terms.8 3.1 Terms and definitions.8 3.2 Symbols,units and abbreviated terms.9 4 The testing of bundled cables.11 4.1 General comments.11 4.2 The bundling of cables.11 4.3 The suspension of the cable bundle.14 4.4 Assessment of the concatenated loop resistance of all pairs.16 5 The temperature as a function of the current load in conductors of bundled cables in hexagonal densest packing structure.17 5.1 The test description.17 5.2 The temperature measurement.18 5.3 The heat generation and the resulting increase of the resistance.20 5.4 The specific resistivity referencing the IACS.24 6 Assessing already deployed cable systems.26 6.1 Background.26 6.2 The installed base.26 6.3 A simplified assessment of the installed base.27 7 The higher performing data grade cables.27 7.1 Conductor and cable diameters.27 8 The heat dissipation on heated and bundled cables.28 8.1 Radiation.28 8.2 Conduction.28 8.3 Convection.28 9 The heat dissipation in a heated conductor,pair or cable which has to be taken into account.29 9.1 The heat dissipation of individual components.29 9.2 The heat dissipation of real cables.35 10 Thermodynamic considerations for a combined experimental and mathematical solution of the heating problem.37 10.1 Objective.37 10.2 The cable bundle consid