1、 IEC TR 61156-1-2 Edition 1.1 2014-09 CONSOLIDATED VERSION Multicore and symmetrical pair/quad cables for digital communications Part 1-2:Electrical transmission characteristics and test methods of Symmetrical pair/quad cables IEC TR 61156-1-2:2009-05+AMD1:2014-09 CSV(en)colourinsideCopyrighted mate
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12、IEC TR 61156-1-2 Edition 1.1 2014-09 CONSOLIDATED VERSION Multicore and symmetrical pair/quad cables for digital communications Part 1-2:Electrical transmission characteristics and test methods of Symmetrical pair/quad cables INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.120.20 ISBN 978-2-8322-18
13、57-0 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 furthe
14、r reproduction or distribution is permitted.Uncontrolled when printed.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 61156-1-2 Edition 1.1 20
15、14-09 REDLINE VERSION Multicore and symmetrical pair/quad cables for digital communications Part 1-2:Electrical transmission characteristics and test methods of Symmetrical pair/quad cables IEC TR 61156-1-2:2009-05+AMD1:2014-09 CSV(en)colourinsideCopyrighted material licensed to BR Demo by Thomson R
16、euters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 IEC TR 61156-1-2:2009 +AMD1:2014 CSV IEC 2014 CONTENTS FOREWORD.5 1 Scope.7 2 Normative references.7 3 Terms,definitions,symbols,units and abbreviated terms.7 3.1 Terms and definitions.7 3.2 Symbols,units and abbreviated terms.8 4 Basic transmission line equations.11 4.1 Introduction.11 4.2 Characteristic impedance and propagation coefficient eq