IEC_TR_61156-1-3-2011.pdf

IEC/TR 61156-1-3 Edition 1.0 2011-04 TECHNICAL REPORT Multicore and symmetrical pair/quad cables for digital communications Part 1-3:Electrical transmission parameters for modelling cable assemblies using symmetrical pair/quad cables IEC/TR 61156-1-3:2011(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 2011 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.Droits de reproduction rservs.Sauf indication contraire,aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd,lectronique ou mcanique,y compris la photocopie et les microfilms,sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur.Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication,utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays de rsidence.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch 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to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month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/TR 61156-1-3 Edition 1.0 2011-04 TECHNICAL REPORT Multicore and symmetrical pair/quad cables for digital communications Part 1-3:Electrical transmission parameters for modelling cable assemblies using symmetrical pair/quad cables INTERNATIONAL ELECTROTECHNICAL COMMISSION U ICS 33.120.20 PRICE CODE ISBN 978-2-88912-429-9 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 TR 61156-1-3 IEC:2011(E)CONTENTS FOREWORD.3 1 Scope.5 2 Normative references.5 3 Terms,definitions,symbols,units and abbreviated terms.6 3.1 Terms and definitions.6 3.2 Symbols,units and abbreviated terms.6 4 Traditional length correction formulae.7 4.1 Introduction.7 4.2 Length correction formulae in IEC 61156-1.7 4.3 The development of the traditional cross-talk length correction formulae NEXT and EL FEXT 3.8 5 Using traditional cross-talk length correction formulae.16 5.1 Background(see 4).16 5.2 Example(see 5,6)Length and frequency dependency of direct near-end crosstalk attenuation.17 6 On length concatenation of measured cables,using scattering and scattering transfer parameters,see informative reference 7.21 7 Matrix(model)status,comparison of different calculations 8.24 8 Recommendations for applying length correction formulae to modelling cross-talk in cable assemblies.25 Bibliography.26 Figure 1 Coupling between two circuits due to unbalances of the primary parameters.9 Figure 2 Integration of the coupled near-and far-end currents over the length of the cable.13 Figure 3 Delta A2 at different frequencies as a function of length.19 Figure 4 Delta A2 for different lengths as a function of frequency.20 Figure 5 Delta A for different lengths as