1、 IEC 61935-1 Edition 4.0 2015-12 INTERNATIONAL STANDARD 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 IEC 61935-1:2015-12(en) colour inside THIS PUBLICATION IS COPYRIGHT PROT
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11、ecification 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 Registered trademark of the International Electrote
12、chnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 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
13、 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 calibratio
14、n 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 Obje
15、ctive . 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
16、.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 Te
17、st method 28 IEC 61935-1:2015 IEC 2015 3 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
18、 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) an
19、d 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 repor
20、t . 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 me
21、thod 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 39 4.13.3 Test equipment and set-up 39 4.13.4 Procedure 40 4.14 Unbalance attenuation, near end
22、43 4 IEC 61935-1:2015 IEC 2015 4.14.1 Objective . 43 4.14.2 Test method 43 4.14.3 Test equipment and set-up 43 4.14.4 Procedure 44 4.14.5 Test report . 46 4.14.6 Uncertainty 46 4.15 Unbalance attenuation, far end . 47 4.15.1 Objective . 47 4.15.2 Test method 47 4.15.3 Test equipment and set-up 47 4.
23、15.4 Procedure 48 4.15.5 Test report . 49 4.15.6 Uncertainty 49 4.16 Coupling attenuation . 49 5 Field test measurement requirements for electrical properties . 49 5.1 Introductory remark . 49 5.2 Cabling configurations tested 50 5.3 Field test parameters 50 5.3.1 General . 50 5.3.2 Inspection of wo
24、rkmanship and connectivity testing . 50 5.3.3 Propagation delay and delay skew . 52 5.3.4 Length . 52 5.3.5 Insertion loss . 53 5.3.6 NEXT, power sum NEXT 53 5.3.7 ACR-N and power sum ACR-N 54 5.3.8 ELFEXT, power sum ELFEXT, ACR-F, power sum ACR-F . 54 5.3.9 Return loss 56 5.3.10 Direct current (DC)
25、 loop resistance 56 5.4 Power sum alien crosstalk 56 5.4.1 Objective . 56 5.4.2 Test method 56 5.4.3 Test equipment and set-up 56 5.4.4 Measuring ANEXT loss 57 5.4.5 Measuring AFEXT loss 57 5.4.6 Procedure 58 5.4.7 Calculation of PS ANEXT and PS AACR-F from measured data 58 5.4.8 Selection of test p
26、orts 61 5.4.9 Test report . 63 5.4.10 Uncertainty of PS alien crosstalk measurements 63 5.5 Data reporting and accuracy . 63 5.5.1 General . 63 5.5.2 Detailed results . 64 5.5.3 Summary results 65 5.5.4 Reporting requirements for power sum alien crosstalk . 69 5.5.5 General . 69 5.5.6 Consistency ch
27、ecks for field testers . 69 5.5.7 Evaluation of consistency tests 70 5.5.8 Administration system applicability 70 5.5.9 Test equipment adapter cords for link testing . 70 IEC 61935-1:2015 IEC 2015 5 5.5.10 User cords and channel testing 70 6 Field tester measurement accuracy requirements 70 6.1 Gene
28、ral . 70 6.2 Measurement accuracy specifications common to level IIE, level III, level IIIE, level IV and level V field testers . 74 6.3 Accuracy performance requirements for Level IIE field testers 74 6.4 Accuracy performance requirements for level III field testers 76 6.5 Accuracy performance requ
29、irements for level IIIE field testers 78 6.6 Accuracy performance requirements for level IV field testers 79 6.7 Accuracy performance requirements for level V field testers . 81 6.8 Field tester requirements applicable to alien crosstalk measurements . 83 6.9 Procedures for determining field tester
30、parameters . 83 6.9.1 General . 83 6.9.2 Output signal balance (OSB) . 84 6.9.3 Common mode rejection (CMR) . 84 6.9.4 Residual NEXT 85 6.9.5 Dynamic accuracy . 86 6.9.6 Source/load return loss 86 6.9.7 Random noise floor 87 6.9.8 Residual FEXT 87 6.9.9 Directivity 88 6.9.10 Tracking 88 6.9.11 Sourc
31、e match 89 6.9.12 Return loss of remote termination 89 6.9.13 Constant error term of the propagation delay measurement function 89 6.9.14 Error constant term proportional to propagation delay of the propagation delay measurement function 89 6.9.15 Constant error term of the delay skew measurement fu
32、nction 90 6.9.16 Constant error term of the length measurement function 90 6.9.17 Error constant proportional to the length of measurement function (assuming the cables are taken from the same drum) 90 6.9.18 Constant error term of the DC resistance measurement function . 90 6.9.19 Error constant te
33、rm proportional to DC resistance of the DC resistance measurement function . 90 6.9.20 Measurement floor for alien crosstalk testing during field testing . 90 6.10 Measurement error models . 92 6.10.1 General . 92 6.10.2 Error model for the insertion loss measurement function 92 6.10.3 Error model f
34、or the NEXT measurement function . 92 6.10.4 Error model for the power sum NEXT measurement function . 93 6.10.5 Error model for the ACR-N measurement function . 93 6.10.6 Error model for the power sum ACR-N measurement function 94 6.10.7 Error model for the ELFEXT or ACR-F measurement function 94 6
35、.10.8 Error model for the power sum ELFEXT and PS ACR-F measurement functions 95 6.10.9 Error model for the return loss measurement function 95 6.10.10 Error model for the propagation delay measurement function. 96 6.10.11 Error model for the delay skew measurement function . 97 6.10.12 Error model
36、for the length measurement function . 97 6.10.13 Error model for the DC loop resistance measurement function . 97 6 IEC 61935-1:2015 IEC 2015 6.11 Network analyzer measurement comparisons . 97 6.11.1 General . 97 6.11.2 Adapters 98 6.11.3 Comparison methods . 100 Annex A (informative) Uncertainty an
37、d variability of field test results 104 A.1 General . 104 A.2 Marginal results reporting . 104 A.3 Nominal accuracy . 104 A.4 Variability in link measurements not included in the measurement accuracy . 105 A.5 Variability in channel measurements . 105 A.6 Field tester accuracy checks . 106 A.6.1 Gen
38、eral . 106 A.6.2 Manipulating cords of link adapter . 106 A.6.3 Exchanging adapters to main and remote field tester units 106 A.6.4 Location of main and remote field tester units 106 A.6.5 Use of previously characterized links . 106 A.6.6 Use separately characterized links using laboratory equipment
39、 . 106 A.6.7 Guidelines for correct installation testing . 107 Annex B (normative) Reference laboratory test configuration for alien crosstalk testing . 108 B.1 General . 108 B.2 Test parameters 108 B.3 Link and channel construction . 108 B.4 Determination of number of disturbing links or channels .
40、 109 B.5 Computation of results 110 B.6 Test report 110 Annex C (informative) General information on power sum alien crosstalk performance of installations 111 Annex D (informative) Baluns. 112 Bibliography 113 Figure 1 Resistor load 18 Figure 2 Reference planes for permanent link, CP link and chann
41、el . 20 Figure 3 180 hybrid used as a balun . 21 Figure 4 DC loop resistance measurement . 24 Figure 5 DC resistance unbalance measurement . 26 Figure 6 Insertion loss test configuration 27 Figure 7 NEXT test configuration . 30 Figure 8 FEXT test configuration 33 Figure 9 Return loss test configurat
42、ion . 35 Figure 10 ANEXT measurement . 37 Figure 11 Alien far end crosstalk measurement 40 Figure 12 Unbalance attenuation, near end test configuration 44 Figure 13 Back-to-back balun differential mode insertion loss measurement 45 Figure 14 Back-to-back balun common mode insertion loss measurement
43、. 45 Figure 15 Unbalance performance test of the measurement balun . 46 Figure 16 Unbalance attenuation far end test configuration 48 IEC 61935-1:2015 IEC 2015 7 Figure 17 Correct pairing . 51 Figure 18 Incorrect pairing . 52 Figure 19 Schematic diagram to measure channel ANEXT loss . 57 Figure 20 A
44、FEXT loss measurement test configuration 58 Figure 21 Flow chart of the alien crosstalk test procedure 62 Figure 22 Example of equipment tolerance region (NEXT) . 64 Figure 23 Block diagram for measuring output signal balance 84 Figure 24 Block diagram to measure common mode rejection 85 Figure 25 B
45、lock diagram for measuring residual NEXT . 86 Figure 26 Block diagram for measuring dynamic accuracy . 86 Figure 27 Principle of measurement of residual FEXT 87 Figure 28 Principle of alternate measurement of residual FEXT . 88 Figure 29 Alien crosstalk measurement floor test for the channel test co
46、nfiguration . 91 Figure 30 Alien crosstalk measurement floor test for the link test configurations 91 Figure 31 Construction details of special patch cord adapter 98 Figure 32 Interfaces to channel by field test and laboratory equipment to compare test results 99 Figure 33 Interfaces to link test co
47、nfiguration by field test and laboratory equipment to compare test results . 100 Figure 34 Sample scatter plot 102 Figure A.1 Source of variability during link testing 105 Figure D.1 Configurations for qualifying test baluns . 112 Table 1 Mixed mode S-parameter nomenclature 21 Table 2 Test balun per
48、formance characteristics . 22 Table 3 Estimated uncertainty of unbalance, near end measurement . 47 Table 4 Estimated uncertainty of unbalance, far end measurement 49 Table 5 Summary of reporting requirements for field test equipment (1 of 3) 66 Table 6 Minimum reporting requirement for PS ANEXT and
49、 PS AACR-F 69 Table 7 Worst case propagation delay, delay skew, DC resistance and length measurement accuracy for level IIE, level III, level IV and level V test instruments . 71 Table 8 Worst case insertion loss, NEXT, ACR-N, ELFEXT/ACR-F and return loss measurement accuracy for Level IIE test instruments . 72 Table 9 Worst case insertion loss, NEXT, ACR-N, ELFEXT/ACR-F and return loss measurement accuracy for Level III test instruments . 72 Tabl
