1、BRITISH STANDARD C ornrnunic at ion cables Specifications for test methods Part 1 - 1 O: Electrical test methods - Crosstalk The European Standard EN 50289-1-10:2001 has the status ofa British Standard ICs 33.120; 29.060.20 BS EN 50289-1-10: 2002 Wk present to the responsible European committee any
2、enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr oss-r e fer
3、enc e s The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Cat
4、alogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document co
5、mprises 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 the document was last issued. O BSI 23 January 2002 ISBN O 580 38939 I EUROPEAN STANDARD EN 50289-1 -1 O NORME EUROPENNE EUROPISCHE NORM No
6、vember 2 O O 1 ICs 33.120.20 English version Communication cables - Specifications for test methods Part 1-1 O: Electrical test methods - Crosstalk Cbles de communication - Spcifications des mthodes dessai Partie 1-1 O: Mthodes dessais lectriques - Affaiblissement diaphonique Nebensprechen Kommunika
7、tionskabel - Spezifikationen fr Prfverfahren Teil 1-1 O: Elektrische Prfverfahren - This European Standard was approved by CENELEC on 2001-03-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status o
8、f a national standard without any alteration. Up-to-date lists and bibliographical references 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 v
9、ersion in any other language made by translation under the responsibility of a CENELEC member 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,
10、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr
11、Elektrotechnische Normung Central Secretariat: rue de Stassart 35. B - 1050 Brussels O 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 EN 50289-1-10:2001 -2- Foreword This European Standard was prepared by t
12、he 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 50289-1-10 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 i
13、dentical national standard or by endorsement (dop) 2002-05-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (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 Euro
14、pean 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 Test procedure 6 6.1 Calibration procedure 6 6.1 .I Insertion loss of t 6 6 6.2 Measuring procedure 6 6.2.1 NEXT 7 6.2.2 FEXT 7 Expression of test r
15、esults 8 8 8 7.3 EL-FEXT 8 9 9 8 Test report . 9 7 EN 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 l
16、evel far end crosstalk (ELFEXT), attenuation to crosstalk 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 r
17、eference, provisions from other publications. These 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 incor
18、porated in it by amendment or revision. For undated 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 Com
19、munication cables - Specifications for test methods - Part 1-8: Electrical test methods - Attenuation EN 50290-1-2 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
20、end crosstalk (NEXT) where PIN = input power into the disturbing pair PZN NEXT = near end crosstalk = output power of the disturbed pair at near end At draft stage. -5- EN 50289-1-10:2001 3.2 Far end crosstalk 3.2.1 input/output-FEXT I.O.FEXT = 10 X LOGIO(PIN/PZF) (dB) where PIN = input power into t
21、he disturbing pair at the near end PZF I.O.FEXT = far end crosstalk = output power of the disturbed pair at far end 3.2.2 equal level far end crosstalk (EL-FEXT) EL-FEXT = 10 X LOGI(PIF/PZF) (dB) where PIF PZF = output power of the disturbing pair at the far end = output power of the disturbed pair
22、at far end EL-FEXT = I.O.FEXT - a*L a*L = measured attenuation of the disturbing pair of the CUT (3) 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 each
23、of these is fed with the input power PIN and 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 balanced s
24、ide : nominal impedance of the CUT Accuracy of test Set-up : I 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
25、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 resul
26、ts may be corrected. Receiver 7 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 CUT. The crosstalk
27、 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: acheck(f)c = acai(f) - acheck(f) (dB) where acai(f) = insertion loss measured at calibration procedure acheck(f) = crosstalk measured at c
28、hecking procedure (4) The corrected crosstalk acheck(f)C shall 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 symmetrical measuring ports
29、. 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 grounded at both ends. For uns
30、creened 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 terminations should provide terminati
31、on 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 R. Values from 25 R to 100 R may be used. The crosstalk shall be measured over the
32、 whole specified frequency range and at the same frequency points as for the calibration procedure. All pairskide 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 measurement results are diffe
33、rent 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. disturbing pair disturbed pair - i i If - - Figure 2 - NEXT Set-up 6.2.2 FEXT For the measurement of FEXT the generat
34、or and receiver are connected to the opposite ends of the CUT, as shown in Figure 3. - disturbing pair disturbed pair Z - Figure 3 - FEXT Set-up EN 50289-1-10:2001 -8- 7 Expression of test results 7.1 NEXT NEXT()L = acai(f) - ameas(f)i (dB) where acai(f) = insertion loss measured at calibration proc
35、edure 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 LOGlo (1 - exp (-0,46a 100) / (1 - exp (-0,46aL) (6) where NEXT(f)c = near end crosstalk corrected to reference length of 100 m NEX
36、T(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 FEXT FEXT(f)L = acai(f) - ame&) where acai(f) = insertion loss measured at cal
37、ibration procedure ameas(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 LOGlo (L/100 m) where FEXT(f)c = far end crosstalk corrected to reference length of 100 m FEXT(f)L = far end crosstalk measured on ca
38、ble 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 - a.L where a.L = measured attenuation of the disturbing pair (7) (9) The test results may be calculated for a reference length of 100 m according t
39、o equation 8 with the same rest ri ct ions. -9- 7.4 ACR EN 50289-1-10:2001 The ACR may be calculated over the whole specified frequency range by : ACR = NEXT-aeL where ACR = attenuation to crosstalk ratio NEXT = near end crosstalk between two pairs a.L = attenuation of the disturbed pair measured ac
40、cording 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 specified frequency range by using the measured crosstalk data according to the following formul
41、a: i = 1, i#j where Xtlk (iJ) n = number of pairs PSXtl k,) = NEXT, FEXT, or EL-FEXT between the disturbing pair i and the disturbed pair j = power sum of crosstalk of the disturbed pair j NOTE NEXT (ij) = NEXT (j,i) 8 Test report The test report shall include: - temperature, - frequency range, - sa
42、mple length, - crosstalk. ACR may be given when requested. BS EN 50289-1-10:2002 BSI 389 Chiswick High Road Lon don W4 4AL BSI 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 incorporat
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