IEC_TR_61156-1-5-2013.pdf

IEC/TR 61156-1-5 Edition 1.0 2013-06 TECHNICAL REPORT Multicore and symmetrical pair/quad cables for digital communications Part 1-5:Correction procedures for the measurement results of return loss and input impedance IEC/TR 61156-1-5:2013(E)colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 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 Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland 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.Useful links:IEC publications search-www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available on-line and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary(IEV)on-line.Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:csciec.ch.Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.IEC/TR 61156-1-5 Edition 1.0 2013-06 TECHNICAL REPORT Multicore and symmetrical pair/quad cables for digital communications Part 1-5:Correction procedures for the measurement results of return loss and input impedance INTERNATIONAL ELECTROTECHNICAL COMMISSION S ICS 33.120.20 PRICE CODE ISBN 978-2-83220-918-9 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 TR 61156-1-5 IEC:2013(E)CONTENTS FOREWORD.3 1 Scope.5 2 Normative references.5 3 Acronyms.5 4 Return loss measurements.6 4.1 General.6 4.2 Return loss(RL).6 4.3 Open/short return loss(OSRL).7 4.4 Structural return loss(SRL).7 5 Correction procedures.8 5.1 General.8 5.2 Parasitic inductance corrected return loss(PRL).9 5.3 Gated return loss(GRL).10 5.4 Fitted return loss(FRL).12 Annex A(informative)Comparison of gated return loss(GRL)with fitted return loss(FRL).18 Annex B(informative)Influence of the correction technique on return loss peaks.20 Figure 1 Return loss with and without junction reflections.6 Figure 2 Return loss and open/short return loss.7 Figure 3 Return loss,open short return loss and structural return loss.8 Figure 4 Input impedance(magnitude)and operational return loss up to 2 GHz.9 Figure 5 Equivalent circuit for the corrective calculation.9 Figure 6 Return loss with gating correction.12 Figure 7 Return loss and input impedance before any correction.15 Figure 8 Return loss and input impedance(with fitting)after fixture correction.15 Figure 9 Residual impedance(after fixture correction)and its fitting.16 Figure 10 Return loss and input impedance after complete correction.16 Figure 11 Return loss,with fixture correction vs.without fixture correction.17 Figure 12 Input impedance(real and imaginary part),with fixture correction vs.without fixture correction.17 Figure A.1 Return loss,fitting vs.gating correction.18 Figure A.2 Real part of input impedance,fitting vs.gating correction.18 Figure A.3 Imaginary part of input impedance,fitting vs.gati