IEC 61935-1:2015

IEC 61935-1 ®
Edition 4.0 2015-12
INTERNATIONAL
STANDARD
colour
inside
Specification for the testing of balanced and coaxial information technology
cabling –
Part 1: Installed balanced cabling as specified in ISO/IEC 11801 and related
standards
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IEC 61935-1 ®
Edition 4.0 2015-12
INTERNATIONAL
STANDARD
colour
inside
Specification for the testing of balanced and coaxial information technology

cabling –
Part 1: Installed balanced cabling as specified in ISO/IEC 11801 and related

standards
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.10 ISBN 978-2-8322-3057-2

– 2 – IEC 61935-1:2015 © IEC 2015

CONTENTS
FOREWORD . 9

INTRODUCTION . 11

1 Scope . 12

2 Normative references . 13

3 Terms, definitions and abbreviations . 14

3.1 Terms and definitions . 14

3.2 Abbreviations . 16
4 Reference measurement procedures for electrical properties . 17
4.1 General . 17
4.2 Balunless . 17
4.2.1 Test equipment considerations . 17
4.2.2 Network analyser test requirements . 18
4.2.3 Test set-up . 18
4.2.4 Termination of conductor pairs . 18
4.2.5 Reference loads for calibration . 19
4.2.6 Test configurations . 19
4.2.7 Coaxial cables and test leads for network analysers . 20
4.2.8 Balunless requirements balanced test leads . 20
4.2.9 Balun requirements. 21
4.2.10 Network analyser measurement precautions . 22
4.2.11 Data reporting and accuracy . 23
4.3 DC loop resistance. 23
4.3.1 Objective . 23
4.3.2 Test method . 24
4.3.3 Test equipment and set-up . 24
4.3.4 Procedure . 24
4.3.5 Test report . 24
4.3.6 Uncertainty . 24
4.3.7 DC loop resistance recalculation . 24
4.4 Direct current (DC) resistance unbalance . 25
4.4.1 Objective . 25
4.4.2 Test method . 25

4.4.3 Test equipment and set-up . 25
4.4.4 Procedure . 25
4.4.5 Test report . 26
4.4.6 Uncertainty . 26
4.5 Insertion loss . 26
4.5.1 Objective . 26
4.5.2 Test method . 26
4.5.3 Test equipment and set-up . 26
4.5.4 Procedure . 27
4.5.5 Temperature correction. 27
4.5.6 Uncertainty . 28
4.6 Propagation delay and delay skew . 28
4.6.1 Objective . 28
4.6.2 Test method . 28

4.6.3 Test equipment and set-up . 28

4.6.4 Procedure . 28

4.6.5 Test report . 29

4.6.6 Uncertainty . 29

4.7 Near-end cross-talk (NEXT) and power sum NEXT . 29

4.7.1 Objective . 29

4.7.2 Test method . 29

4.7.3 Test equipment and set-up . 29

4.7.4 Procedure . 30

4.7.5 Test report . 31

4.7.6 Uncertainty . 31
4.8 Attenuation to crosstalk ratio, near end (ACR-N) and power sum ACR-N . 31
4.8.1 Objective . 31
4.8.2 Test method . 31
4.8.3 Test equipment and set-up . 32
4.8.4 Procedure and calculation . 32
4.8.5 Test report . 32
4.8.6 Uncertainty . 32
4.9 Far-end cross-talk (FEXT) and power sum FEXT . 32
4.9.1 Objective . 32
4.9.2 Test method . 32
4.9.3 Test equipment and set-up . 32
4.9.4 Procedure . 33
4.9.5 Test report . 34
4.9.6 Uncertainty of FEXT measurements . 34
4.10 Attenuation to crosstalk ratio, far end (ACR-F) . 34
4.10.1 Objective . 34
4.10.2 Calculation . 34
4.10.3 Test report . 35
4.10.4 Uncertainty . 35
4.11 Return loss . 35
4.11.1 Objective . 35
4.11.2 Test method . 35
4.11.3 Test equipment and set-up . 35
4.11.4 Procedure . 36

4.11.5 Test report . 36
4.11.6 Uncertainty . 36
4.12 PS Alien near end crosstalk (PS ANEXT – Exogenous crosstalk) . 36
4.12.1 Objective . 36
4.12.2 Test method . 36
4.12.3 Test equipment and set-up . 36
4.12.4 Procedure . 37
4.13 PS Attenuation to alien crosstalk ratio, far end crosstalk (PS AACR-F –
Exogenous crosstalk) . 39
4.13.1 Objective . 39
4.13.2 Test method .
...