1、Connectors for electronic equipment Tests and measurements Part 25-9: Signal integrity tests Test 25i: Alien crosstalkBS EN 60512-25-9:2008raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis British Standard is t
2、he UK implementation of EN 60512-25-9:2008. It isidentical to IEC 60512-25-9:2008.The UK participation in its preparation was entrusted to Technical CommitteeEPL/48, Electromechanical components and mechanical structures for elec-tronic equipment.A list of organizations represented on this committee
3、 can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2008ISBN 978 0 580 55641 8ICS 31.220.10BRITISH STANDARDBS EN 60512-25-9:2008Compliance with a British Standard ca
4、nnot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text affectedMarch 200931EUROPEAN STANDARD EN 60512-25-9 NORME EUROPENNE EUROPISCHE NORM November 2008
5、CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved
6、worldwide for CENELEC members. Ref. No. EN 60512-25-9:2008 E ICS 31.220.10 English version Connectors for electronic equipment - Tests and measurements - Part 25-9: Signal integrity tests - Test 25i: Alien crosstalk (IEC 60512-25-9:2008) Connecteurs pour quipements lectroniques - Essais et mesures -
7、 Partie 25-9: Essais dintgrit des signaux -Essai 25i: Diaphonie exogne (CEI 60512-25-9:2008) Steckverbinder fr elektronische Einrichtungen - Mess- und Prfverfahren - Teil 25-9: Signalintegrittsprfungen - Prfung 25i: Externes Nebensprechen (Alien Crosstalk) (IEC 60512-25-9:2008) This European Standar
8、d was approved by CENELEC on 2008-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning
9、 such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its o
10、wn language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ita
11、ly, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60512-25-9:2008EN 60512-25-9:2008 - 2 - Foreword The text of document 48B/1915/FDIS, future edition 1 of IEC 60512-25-9, prepared
12、 by SC 48B, Connectors, of IEC TC 48, Electromechanical components and mechanical structures for electronic equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60512-25-9 on 2008-11-01. The following dates were fixed: latest date by which the EN has to be impl
13、emented at national level by publication of an identical national standard or by endorsement (dop) 2009-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Internation
14、al Standard IEC 60512-25-9:2008 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60068-1 NOTE Harmonized as EN 60068-1:1994 (not modified). ISO/IEC 11801 NOTE In E
15、urope the subject is covered by the series EN 50173, Information technology - Generic cabling systems. _ BS EN 60512-25-9:2008- 3 - EN 60512-25-9:2008 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced docum
16、ents 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 document (including any amendments) applies. NOTE When an international publication has been modified by common modification
17、s, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-581 - 1)International Electrotechnical Vocabulary (IEV) - Chapter 581: Electromechanical components for electronic equipment - - IEC 60512-26-100 - 1)Connectors for electronic equipment - Tests and measure
18、ments - Part 26-100: Measurement setup, test and reference arrangements and measurements for connectors according to IEC 60603-7 - Tests 26a to 26g EN 60512-26-100 2008 2)IEC 60603-7 Series Connectors for electronic equipment - Part 7: Detail specification for 8-way, unshielded, free and fixed conne
19、ctors EN 60603-7 Series IEC 60603-7-4 2005 Connectors for electronic equipment - Part 7-4: Detail specification for 8-way, unshielded, free and fixed connectors, for data transmissions with frequencies up to 250 MHzEN 60603-7-4 2005 IEC 61076-3-104 2006 Connectors for electronic equipment - Product
20、requirements - Part 3-104: Detail specification for 8-way, shielded free and fixed connectors for data transmissions with frequencies up to 1 000 MHz EN 61076-3-104 2006 IEC 61156 Series Multicore and symmetrical pair/quad cables for digital communications - - 1)Undated reference. 2)Valid edition at
21、 date of issue. BS EN 60512-25-9:2008 2 60512-25-9 IEC:2008 CONTENTS 1 Scope and object5 2 Normative references5 3 Terms and definitions .5 4 Overview 6 4.1 Procedure6 4.2 Resources .7 5 Overall test arrangement.7 5.1 General .7 5.2 Terminations .8 5.3 Pairs of connectors to test .8 6 Procedure to t
22、est alien crosstalk from one connector to another connector10 6.1 Calibration.10 6.2 Measurement (noise) floor .10 6.3 Alien crosstalk measurement .10 7 Procedure for determining significance11 8 Details to be specified in the detail specification12 9 Power sum calculation, report and documentation.
23、12 Annex A (informative) Flow chart for obtaining alien crosstalk performance data.13 Annex B (informative) Illustrations of alien crosstalk testing using coaxial switching14 Bibliography18 Figure 1 Schematic for testing without a switch.8 Figure 2 Schematic for terminations .8 Figure 3 Connector ar
24、ray9 Figure 4 Test directions11 Figure A.1 Flowchart for the test procedure 13 Figure B.1 Schematic for testing with a switch 14 Figure B.2 Example network analyzer, switch, and fixture with 8 baluns in 2 clusters.15 Figure B.3 Example of fixture, in which balun clusters can slide left and right16 F
25、igure B.4 Post can rotate three different directions17 BS EN 60512-25-9:200860512-25-9 IEC:2008 5 CONNECTORS FOR ELECTRONIC EQUIPMENT TESTS AND MEASUREMENTS Part 25-9: Signal integrity tests Test 25i: Alien crosstalk 1 Scope and object This part of IEC 60512 defines a test method which is intended t
26、o assess the near-end alien crosstalk (ANEXT) and the far-end alien crosstalk (AFEXT) between connectors in close proximity, when mounted in their mounting systems. Both discrete modular connectors and multi-port panel connectors may be tested using this method. This method provides a means to test
27、the alien (exogenous) crosstalk between any two ports, as well as a means to assess the overall alien crosstalk from all other ports. This test procedure is generally applicable to any electrical connector, and is particularly suitable to connectors described in IEC 60603-7 series, IEC 61076-3-104,
28、and other types of connectors for data transmission. 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 document (includin
29、g any amendments) applies. IEC 60050-581, International Electrotechnical Vocabulary (IEV) Chapter 581: Electromechanical components for electronic equipment IEC 60512-26-100, Connectors for electronic equipment Tests and measurement Part 26-100: Measurement setup, test and reference arrangements and
30、 measurements for connectors according to IEC 60603-7 (tests 26a to 26g) IEC 60603-7-4:2005, Connectors for electronic equipment Part 7-4: Detail specification for 8-way, unshielded, free and fixed connectors, for data transmissions with frequencies up to 250 MHz IEC 60603-7 (all parts), Connectors
31、for electronic equipment Part 7: Detail specifications for 8-way, (un)shielded, free and fixed connectors, for data transmissions IEC 61076-3-104:2006, Connectors for electronic equipment Part 3-104: Detail specification for 8-way, shielded, free and fixed connectors, for data transmissions with fre
32、quencies up to 1000 MHz IEC 61156, Multicore and symmetrical pair/quad cable for digital communications 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-581 apply as well as the following. 3.1 alien (exogenous) crosstalk (AXT) signal coupling fr
33、om disturbing conductor pairs into a disturbed pair of another connector BS EN 60512-25-9:2008 6 60512-25-9 IEC:2008 3.2 alien (exogenous) near-end crosstalk (ANEXT) loss signal coupling from a near-end disturbing conductor pair into a disturbed pair of another connector, measured at the near-end 3.
34、3 alien (exogenous) far-end crosstalk (AFEXT) loss signal coupling from a near-end disturbing conductor pair into a disturbed pair of another connector, measured at the far-end 3.4 power sum alien (exogenous) near-end crosstalk (PSANEXT) loss a computation of signal coupling from multiple near-end d
35、isturbing conductor pairs, in one or more connectors, into a disturbed pair of another connector, measured at the near-end 3.5 power sum alien (exogenous) far-end crosstalk (PSAFEXT) loss a computation of signal coupling from multiple near-end disturbing conductor pairs, in one or more connectors, i
36、nto a disturbed pair of another connector, measured at the far-end 4 Overview 4.1 Procedure Alien crosstalk is a property that exists between connectors. It is affected by the properties of the connectors themselves, as well as the arrangement of the connectors in their mounting system, and the moun
37、ting systems themselves. Examples of mounting systems include faceplates, mounting boxes, frame-mounted panels, frames containing multiple panels, etc. Where necessary, connectors in other frame-mounted panels, etc., in close proximity shall be included as disturbing connectors. Alien crosstalk of t
38、he connector should be tested for all mounting systems in which the connector is intended to be mounted, or a sub-set thereof, as defined by the detail specification. Manufacturers may define a worst case mounting system, and test in either or both. This procedure may also be applied to multi-port c
39、onnector panels, in which case each port of the panel shall be treated as a discrete connector. The mounting systems shall be filled, at a minimum, with all connectors that are significant in respect to the alien crosstalk of the disturbed connector. The number of connectors that need to be tested i
40、s explained in 5.3 and Clause 7. As there are generally four conductor pairs in each connector, and therefore 16 pair combinations for each port combination, consideration should be given for a convenient method for testing those combinations, such as automatic switching. Further, the interconnectio
41、n method between the baluns and the CUT (connectors under test) should provide sufficient flexibility to easily connect the baluns to different CUTs. As the devices need to be terminated with cables, a minimum of two cables, each at least 40 m long, shall be available, and for convenience considerat
42、ion should be given to having a larger number of termination cables available. These cables shall be separated as far as possible during the test. The procedure to perform this test shall be as follows. The mounting system for the connectors shall be set up near the measurement system. The connector
43、s shall be installed in the mounting system. One connector shall be selected as the disturbed connector for a particular instance of this test. Another connector shall be selected as the first disturbing connector. The two connectors shall be terminated and connected to the measurement system as spe
44、cified in Clause 6. The ANEXT loss and AFEXT loss, as required, shall be measured, between these connectors, as specified in Clause 6. The significance of the alien crosstalk, for each frequency point of each pair combination, shall be checked, per Clause 7. A determination shall be made, per Clause
45、 7, whether additional disturbing connectors need to be tested for this disturbed connector. Testing shall continue until all significant disturbing connectors have been BS EN 60512-25-9:200860512-25-9 IEC:2008 7 tested, per 5.3 and Clause 7. Then, the power sum of all significant pair-to-pair measu
46、rements shall be calculated, per Clause 9. Finally, a report shall be written per Clause 9. If required, additional disturbed connectors, and additional mounting arrangements, may be tested. The preceding paragraph provides the procedure by which all the necessary information shall be obtained. The
47、steps may be performed in any order. Annex A illustrates the above. 4.2 Resources The measurements shall be performed using a network analyzer, or with a signal generator and receiver. The required equipment includes: a) A network analyzer with a minimum frequency range of 1 MHz to 1 GHz shall prefe
48、rably be used. A signal generator and a receiver may also be used. b) If baluns are used, a minimum of 2 baluns meeting the requirements of IEC 60603-7-4, Annex D, extrapolated to the highest frequency of interest (8 baluns are recommended). c) A minimum of 2 cables, minimum 40 m long, suitable for
49、terminating all pairs of the far ends of the connectors under test. These shall be minimum category 6, IEC 61156 cables. For category 7 or better connectors, the terminating cables shall be the same or higher category as the connectors. Their return loss and balance should be as good as possible, to provide the best possible connector termination. Consideration should be given to the use of a larger number of cables. Cables are needed for both the cable termination (fi
