BS EN 50289-1-10-2002 Communication cables - Specifications for test methods - Electrical test methods - Crosstalk《通信电缆 试验方法规范 电气试验方法 串音》.pdf

1、BRITISH STANDARD BS EN 50289-1-10: 2002 Communication cables Specifications for test methods Part 1-10: Electrical test methods Crosstalk The European Standard EN 50289-1-10:2001 has the status of a British Standard ICS 33.120; 29.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYR

2、IGHT LAWBS EN 50289-1-10:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 January 2002 BSI 23 January 2002 ISBN 0 580 38939 1 Natio

3、nal foreword This British Standard is the official English language version of EN 50289-1-10:2001. The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wires and waveguides, RF connectors and accessories for communication and signalling, to Subcommittee EPL/46

4、/1, Communication cables, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in

5、the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are

6、responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK i

7、nterests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright date displayed in this document indicates when

8、the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-1-10 NORME EUROPENNE EUROPISCHE NORM November 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr

9、 Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-1-10:2001 E ICS 33.120.20 English version Communication cables - Specifications for t

10、est methods Part 1-10: Electrical test methods - Crosstalk Cbles de communication - Spcifications des mthodes dessai Partie 1-10: Mthodes dessais lectriques - Affaiblissement diaphonique Kommunikationskabel - Spezifikationen fr Prfverfahren Teil 1-10: Elektrische Prfverfahren - Nebensprechen This Eu

11、ropean Standard was approved by CENELEC on 2001-03-01. 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 referen

12、ces concerning 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 mem

13、ber into its own 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Net

14、herlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50289-1-10:2001 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50

15、289-1-10 on 2001-03-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-05-01 - latest date by which the national standards conflicting with the EN have to be withdrawn

16、 (dow) 2004-04-01 This European Standard has been prepared under the European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association.- 3 - EN 50289-1-10:2001 Contents 1 Scope 4 2 Normative references . 4 3 Definitions. 4 4 Equipment. 5 5 Test sample. 5 6 Te

17、st procedure 6 6.1 Calibration procedure. 6 6.1.1 Insertion loss of test set-up . 6 6.1.2 Crosstalk of test set-up . 6 6.2 Measuring procedure . 6 6.2.1 NEXT 7 6.2.2 FEXT 7 7 Expression of test results 8 7.1 NEXT. 8 7.2 FEXT . 8 7.3 EL-FEXT 8 7.4 ACR. 9 7.5 Power sum of crosstalk 9 8 Test report. 9E

18、N 50289-1-10:2001 - 4 - 1 Scope Part 1-10 of EN 50289 details the test methods to determine the crosstalk of cables used in analogue and digital communication systems. Crosstalk effects are near end crosstalk (NEXT), far end crosstalk (FEXT), equal level far end crosstalk (ELFEXT), attenuation to cr

19、osstalk ratio (ACR) and power sum of crosstalk (PS). It is to be read in conjunction with Part 1-1 of EN 50289, which contains essential provisions for its application. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. Thes

20、e normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undate

21、d references, the latest edition of the publication referred to applies (including amendments). EN 50289-1-1 2001 Communication cables Specifications for test methods - Part 1-1: Electrical test methods - General requirements EN 50289-1-8 2001 Communication cables - Specifications for test methods -

22、 Part 1-8: Electrical test methods - Attenuation EN 50290-1-2 1) Communication cables - Part 1-2: Definitions 3 Definitions For the purposes of this European Standard, the definitions of EN 50290-1-2 apply in addition to the following ones. 3.1 near end crosstalk (NEXT) NEXT = 10 LOG 10 (P 1N /P 2N

23、) (dB) (1) where P 1N = input power into the disturbing pair P 2N = output power of the disturbed pair at near end NEXT = near end crosstalk1)At draft stage.- 5 - EN 50289-1-10:2001 3.2 Far end crosstalk 3.2.1 input/output-FEXT I.O.FEXT = 10 LOG 10 (P 1N /P 2F ) (dB) (2) where P 1N= input power into

24、 the disturbing pair at the near end P 2F= output power of the disturbed pair at far end I.O.FEXT = far end crosstalk 3.2.2 equal level far end crosstalk (EL-FEXT) EL-FEXT = 10 LOG 10 (P 1F /P 2F ) (dB) (3) where P 1F= output power of the disturbing pair at the far end P 2F= output power of the dist

25、urbed pair at far end EL-FEXT = I.O.FEXT - L L = measured attenuation of the disturbing pair of the CUT 3.3 attenuation to crosstalk ratio (ACR) the difference of the near end crosstalk and the attenuation 3.4 power sum (PS) describes the influence on one circuit of the rest of the circuits, when ea

26、ch of these is fed with the input power P 1Nand is calculated as shown in 7.5 4 Equipment As an alternative to analysers a generator and a receiver may be used. Generator and receiver shall be tuned to the same frequency. - Balun : unbalanced side : nominal impedance of the measuring devices balance

27、d side : nominal impedance of the CUT Accuracy of test set-up : 5 % 5 Test sample The cable under test (CUT) shall have a minimum length of 100 m if not otherwise specified and both ends of the CUT shall be prepared, such that when connected to the terminals of the test equipment the twisting of the

28、 pairs/quads is maintained.EN 50289-1-10:2001 - 6 - 6 Test procedure 6.1 Calibration procedure 6.1.1 Insertion loss of test set-up The insertion loss of the transformers and test set-up shall be measured over the whole specified frequency range. The calibration data shall be saved, such that the res

29、ults may be corrected. Generator Receiver Ri Ri Figure 1 - Calibration set-up 6.1.2 Crosstalk of test set-up The crosstalk of the test set-up shall be measured in the following way: The symmetrical measuring ports of the generator and receiver shall be terminated with the nominal impedance of the CU

30、T. The crosstalk shall be measured over the whole specified frequency range, and at the same frequency points as for the calibration procedure. The crosstalk shall be corrected: a check (f) C= a cal (f) - a check (f) (dB) (4) where a cal (f) = insertion loss measured at calibration procedure a check

31、 (f) = crosstalk measured at checking procedure The corrected crosstalk a check (f) Cshall be at least 10 dB better over the whole frequency range than the specified values of the cable. A lower margin would lead to inferior accuracy. 6.2 Measuring procedure The test sample shall be connected to the

32、 symmetrical measuring ports. The set-up has to be optimised, so that the mismatch between the measuring ports and the sample is minimised. The pairs/quads which are connected to the measuring devices shall be matched with their nominal impedance at the other cable end. Any cable screens shall be gr

33、ounded at both ends. For unscreened cables and for cables with an overall screen all quads/pairs in the cable under test shall be terminated. For cables with individually screened pairs, termination is only needed for pairs connected to the measurement equipment.- 7 - EN 50289-1-10:2001 All terminat

34、ions should provide termination of both the differential and common mode signal. The nominal value for the differential mode termination is equal to the characteristic impedance of the cable. The nominal value of the common mode termination is 50 . Values from 25 to 100 may be used. The crosstalk sh

35、all be measured over the whole specified frequency range and at the same frequency points as for the calibration procedure. All pairs/side of quads combinations shall be measured. NOTE Due to localised couplings, NEXT measurement results are different from both ends of the CUT. FEXT and EL-FEXT meas

36、urement results are different when changing transmitting and receiving pairs. 6.2.1 NEXT For the measurement of NEXT the generator and receiver are connected to the same end of the CUT, as shown in Figure 2. Generator Receiver Ri Ri disturbing pair disturbed pair Figure 2 - NEXT set-up 6.2.2 FEXT Fo

37、r the measurement of FEXT the generator and receiver are connected to the opposite ends of the CUT, as shown in Figure 3. Generator Ri Z disturbing pair Ri Z disturbed pair Receiver Figure 3 - FEXT set-upEN 50289-1-10:2001 - 8 - 7 Expression of test results 7.1 NEXT NEXT(f) L= a cal (f) a meas (f) L

38、dB) (5) where a cal (f) = insertion loss measured at calibration procedure a meas (f) L = crosstalk measured at measuring procedure The results for a reference length of 100 m may be calculated from the test results. NEXT(f) C= NEXT(f) L- 10 LOG 10(1 - exp (-0,46a 100) / (1 - exp (-0,46aL) (6) wher

39、e NEXT(f) C = near end crosstalk corrected to reference length of 100 m NEXT(f) L = near end crosstalk measured on cable length L a = attenuation of cable length in dB/m L = cable length in m NOTE Equation 6 is valid for pure statistically distributed couplings and should be used with caution. 7.2 F

40、EXT FEXT(f)L = a cal (f) - a meas (f) (7) where a cal (f) = insertion loss measured at calibration procedure a meas (f) = crosstalk measured at measuring procedure The test results may be calculated for the reference length of 100 m: FEXT(f) C= FEXT(f) L+ 10 LOG 10(L/100 m) (8) where FEXT(f) C = far

41、 end crosstalk corrected to reference length of 100 m FEXT(f) L = far end crosstalk measured on cable length L L = cable length in m NOTE Equation 8 is valid for a systematic coupling and should be used with caution. 7.3 EL-FEXT ELFEXT(f) L= FEXT(f) L- L( 9 ) where L = measured attenuation of the di

42、sturbing pair The test results may be calculated for a reference length of 100 m according to equation 8 with the same restrictions.- 9 - EN 50289-1-10:2001 7.4 ACR The ACR may be calculated over the whole specified frequency range by : ACR = NEXT L (10) where ACR = attenuation to crosstalk ratio NE

43、XT = near end crosstalk between two pairs L = attenuation of the disturbed pair measured according to EN 50289-1-8 NOTE ACR is automatically fulfilled, when NEXT and attenuation requirements are fulfilled. 7.5 Power sum of crosstalk The power sum of crosstalk shall be calculated over the whole speci

44、fied frequency range by using the measured crosstalk data according to the following formula: n PS Xtlk,j = - 10 LOG 10 10 - 0,1 Xtlk (i,j) (11) i = 1, i j where Xtlk (i,j) = NEXT, FEXT, or EL-FEXT between the disturbing pair i and the disturbed pair j n = number of pairs PS Xtlk,j = power sum of cr

45、osstalk of the disturbed pair j NOTE NEXT (i,j) NEXT (j,i) 8 Test report The test report shall include: - temperature, - frequency range, - sample length, - crosstalk. ACR may be given when requested.BS EN 50289-1-10:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI

46、 is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make

47、sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee respo

48、nsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for a

49、ll BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of informati