1、 IEC 61935-2 Edition 3.0 2010-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Specification for the testing of balanced and coaxial information technology cabling Part 2: Cords as specified in ISO/IEC 11801 and related standards Spcification relative aux essais des cblages symtriques et coaxiaux des
2、technologies de linformation Partie 2: Cordons tels que spcifis dans lISO/CEI 11801 et normes associes IEC 61935-2:2010 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be re
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17、ication for the testing of balanced and coaxial information technology cabling Part 2: Cords as specified in ISO/IEC 11801 and related standards Spcification relative aux essais des cblages symtriques et coaxiaux des technologies de linformation Partie 2: Cordons tels que spcifis dans lISO/CEI 11801
18、 et normes associes INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 33.040.20; 33.120.20 PRICE CODE CODE PRIX ISBN 978-2-88912-001-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Interna
19、tionale colour inside 2 61935-2 IEC:2010 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms and definitions .8 4 General requirements and test configuration 8 4.1 Cable and connector design 8 4.2 Balanced cord, cable and connector tests .8 4.3 Test configuration and equip
20、ment8 4.4 Balanced cord tests requirements .9 5 Acceptance tests 10 5.1 Visual inspection .10 5.2 Wire map.11 5.3 Propagation delay .12 5.4 Delay skew12 5.5 Insertion loss.12 5.6 Return loss12 5.7 Near end crosstalk (NEXT)13 5.8 Assumptions used in the development of cord requirements16 6 Balanced c
21、ord test procedure Network analyser test configuration 16 7 Periodic tests .17 7.1 General .17 7.2 Tensile strength 17 7.3 Flexure18 7.4 Bending.19 7.5 Twisting.19 7.6 Crushing .20 7.7 Dust test21 7.8 Coupling attenuation .23 7.9 Climatic sequence.24 8 Test head requirements24 8.1 General .24 8.2 Mi
22、nimum requirements for all test head designs 24 8.3 Additional FEXT requirements for balanced connector compatible test heads25 8.4 Additional return loss requirements for balanced connector compatible test heads25 8.5 NEXT loss centering requirements for balanced connector compatible test heads25 B
23、ibliography27 61935-2 IEC:2010 3 Figure 1 Test configuration for balanced cord for NEXT and return loss measurements 9 Figure 2 Correct pairing .11 Figure 3 Incorrect pairing.11 Figure 4 Initial marking of the cable sheath17 Figure 5 Final visual inspection17 Figure 6 Fixture for balanced cord flexu
24、re test .18 Figure 7 Bending test: assembly in U shape 19 Figure 8 Twisting test: assembly in U shape 20 Figure 9 Fixture for cable crushing test 21 Figure 10 Measuring device.23 Figure 11 Centering of NEXT properties of the balanced connector test head 26 Table 1 Return loss requirements 13 Table 2
25、 Balanced cord return loss requirements at key frequencies .13 Table 3 Category 5 balanced cord NEXT requirements at key frequencies.15 Table 4 Category 6 balanced cord NEXT requirements at key frequencies.15 Table 5 Category 6 Abalanced cord NEXT requirements at key frequencies 15 Table 6 Category
26、7 balanced cord NEXT requirements at key frequencies.15 Table 7 Category 7 Abalanced cord NEXT requirements at key frequencies 15 Table 8 Assumptions for cabling components used in the development of NEXT and return loss requirements .16 Table 9 Coupling attenuation limits 23 4 61935-2 IEC:2010 INTE
27、RNATIONAL ELECTROTECHNICAL COMMISSION _ SPECIFICATION FOR THE TESTING OF BALANCED AND COAXIAL INFORMATION TECHNOLOGY CABLING Part 2: Cords as specified in ISO/IEC 11801 and related standards FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardizati
28、on comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes Internation
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37、o the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be
38、held responsible for identifying any or all such patent rights. International Standard IEC 61935-2 has been prepared by IEC technical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories. This third edition cancels and replaces the second ed
39、ition published in 2005. This third edition of IEC 61935-2 differs from the second edition in that it covers category 6 Ato category 7 Acords as defined in ISO/IEC 11801. 61935-2 IEC:2010 5 The text of this standard is based on the following documents: FDIS Report on voting 46/351/FDIS 46/364/RVD Fu
40、ll information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of t
41、he IEC 61935 series, under the general title: Specification for the testing of balanced and coaxial information technology cabling, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability indicated on the IEC web site
42、 under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cove
43、r page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 61935-2 IEC:2010 INTRODUCTION Balanced cords are constructed for connecting equipment us
44、ing free connectors according to IEC 60603-7 series, IEC 61076-3-104 and IEC 61076-3-110. It is known that connecting hardware performance is subject to influence by the properties of the free connector termination and therefore balanced cords should be tested to determine the quality of the assembl
45、y. Moreover, the performance of balanced cords may differ due to the performances of the involved separate components depending upon the efficiency of the manufacturing procedure. Manufacturing procedures also impact upon the reliability of these balanced cords. Therefore, the primary object of this
46、 standard is to provide test methods to ensure compatibility of balanced cords to be used in cabling according to ISO/IEC 11801. Another object is to provide test methods and associated requirements to demonstrate the performance and reliability of these balanced cords during their operational lifet
47、ime. The test methods described in this standard may also be used for any balanced cords that include twisted pairs terminated at each end. 61935-2 IEC:2010 7 SPECIFICATION FOR THE TESTING OF BALANCED AND COAXIAL INFORMATION TECHNOLOGY CABLING Part 2: Cords as specified in ISO/IEC 11801 and related
48、standards 1 Scope This International Standard provides methods to ensure compatibility of balanced cords to be used in cabling according to ISO/IEC 11801 and provides test methods and associated requirements to demonstrate the performance and reliability of these balanced cords during their operatio
49、nal lifetime. This International Standard may also be used for providing test methods for assessing the behaviour of other balanced cords. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced docu
