1、 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
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11、oaded 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 c
12、able 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
13、.,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 Symbo
14、ls,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.1
15、6 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 cal
16、culations 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
