BS EN 50289-1-9-2017 Communication cables Specifications for test methods Electrical test methods Unbalance attenuation (transverse conversion loss TCL transverse conversion transf.pdf

1、BS EN 50289-1-9:2017Communication cables Specifications for test methodsPart 1-9: Electrical test methods Unbalance attenuation (transverseconversion loss TCL transverse conversiontransfer loss TCTL)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 50289-1-9:2017

2、 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50289-1-9:2017. It supersedes BS EN 50289-1-9:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EPL/46, Cables, wires and waveguides, radio frequency connectors a

3、nd accessories for communication and signalling.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British St

4、andards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 94378 2 ICS 33.120.20 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 20

5、17.Amendments/corrigenda issued since publicationDate Text affectedBS EN 50289-1-9:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50289-1-9 March 2017 ICS 33.120.20 Supersedes EN 50289-1-9:2001 English Version Communication cables - Specifications for test methods - Part 1-9: Electrical te

6、st methods - Unbalance attenuation (transverse conversion loss TCL transverse conversion transfer loss TCTL) Cbles de communication - Spcifications des mthodes dessai Partie 1-9: Mthodes dessais lectriques - Affaiblissement de disymtrie (perte de conversion longitudinale, perte de transfert de conve

7、rsion longitudinale) Kommunikationskabel - Spezifikationen fr Prfverfahren Teil 1-9: Elektrische Prfverfahren - Unsymmetriedmpfung (Unsymmetriedmpfung am nahen und am fernen Ende) This European Standard was approved by CENELEC on 2016-12-16. CENELEC members are bound to comply with the CEN/CENELEC I

8、nternal 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 such national standards may be obtained on application to the CEN-CENELEC Management Centre or to

9、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 own language and notified to the CEN-CENELEC Management Centre has the same status as the

10、official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembou

11、rg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normu

12、ng CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50289-1-9:2017 E BS EN 50289-1-9:2017EN 50289-1-9:2017 (E) 2 Contents PageEuropean foreword 3 1 Scope. 4 2 Norm

13、ative references 4 3 Terms and definitions 4 4 Test method . 5 4.1 Method A: measurement using balun setup 5 4.1.1 Test equipment 5 4.1.2 Test sample . 5 4.1.3 Calibration procedure 6 4.1.4 Measuring procedure . 8 4.1.5 Expression of test results 10 4.2 Method B: measurement using balun-less setup 1

14、1 4.2.1 Test equipment 11 4.2.2 Test sample . 11 4.2.3 Calibration procedure 12 4.2.4 Measuring procedure . 12 4.2.5 Expression of test results 13 5 Test report . 14 Annex A (informative) General background of unbalance attenuation . 15 A.1 General 15 A.2 Unbalance attenuation near end and far end 1

15、6 A.3 Theoretical background . 17 Bibliography . 21 BS EN 50289-1-9:2017 EN 50289-1-9:2017 (E) 3 European foreword This document EN 50289-1-9:2017 has been prepared by CLC/TC 46X “Communication cables”. The following dates are fixed: latest date by which this document has to be implementedat nationa

16、l level by publication of an identical nationalstandard or by endorsement(dop) 2017-09-16 latest date by which the national standards conflicting withthis document have to be withdrawn(dow) 2019-12-16 This document supersedes EN 50289-1-9:2001. Attention is drawn to the possibility that some of the

17、elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. EN 50289-1, Communication cables Specifications for test methods, is currently composed with the following parts: Part 1-1: Electrical test methods Gene

18、ral requirements; Part 1-2: Electrical test methods DC resistance; Part 1-3: Electrical test methods Dielectric strength; Part 1-4: Electrical test methods Insulation resistance; Part 1-5: Electrical test methods Capacitance; Part 1-6: Electrical test methods Electromagnetic performance; Part 1-7: E

19、lectrical test methods Velocity of propagation; Part 1-8: Electrical test methods Attenuation; Part 1-9: Electrical test methods Unbalance attenuation (transverse conversion loss TCL transverse conversion transfer loss TCTL); Part 1-10: Electrical test methods Crosstalk; Part 1-11: Electrical test m

20、ethods Characteristic impedance, input impedance, return loss; Part 1-12: Electrical test methods Inductance; Part 1-13: Electrical test methods Coupling attenuation or screening attenuation of patch cords / coaxial cable assemblies / pre-connectorised cables; Part 1-14: Electrical test methods Coup

21、ling attenuation or screening attenuation of connecting hardware; Part 1-15: Electromagnetic performance Coupling attenuation of links and channels (Laboratory conditions); Part 1-16: Electromagnetic performance Coupling attenuation of cable assemblies (Field conditions); Part 1-17: Electrical test

22、methods Exogenous Crosstalk ExNEXT and ExFEXT. BS EN 50289-1-9:2017EN 50289-1-9:2017 (E) 4 1 Scope This European Standard details the test methods to determine the attenuation of converted differential-mode signals into common-mode signals, and vice versa, due to balance characteristics of cables us

23、ed in analogue and digital communication systems by using the transmission measurement method. The unbalance attenuation is measured in, respectively converted to, standard operational conditions. If not otherwise specified, e.g. by product specifications, the standard operational conditions are a d

24、ifferential-mode which is matched with its nominal characteristic impedance (e.g. 100 ) and a common-mode which is loaded with 50 . The difference between the (image) unbalance attenuation (matched conditions in the differential and common-mode) to the operational (Betriebs) unbalance attenuation (m

25、atched conditions in differential-mode and 50 reference load in the common-mode) is small provided the common-mode impedance Zcomis in the range of 25 to 75 . For cables having a nominal impedance of 100 , the value of the common-mode impedance Zcomis about 75 for up to 25 pair- count unscreened pai

26、r cables, 50 for common screened pair cables and more than 25 pair- count unscreened pair cables, and 25 for individually screened pair cables. The impedance of the common-mode circuit Zcomcan be measured more precisely either with a time domain reflectometer (TDR) or a network analyser. The two con

27、ductors of the pair are connected together at both ends and the impedance is measured between these conductors and the return path. This European Standard is bound to be read in conjunction with EN 50289-1-1, which contains essential provisions for its application. 2 Normative references The followi

28、ng documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50289-1-1:2017,

29、 Communication cables Specifications for test methods Part 1-1: Electrical test methods General requirements EN 50289-1-8, Communication cables - Specifications for test methods - Part 1-8: Electrical test methods - Attenuation EN 50290-1-2, Communication cables - Part 1-2: Definitions 3 Terms and d

30、efinitions For the purposes of this document, the terms and definitions given in EN 50290-1-2 and the following apply. 3.1 unbalance attenuation logarithmic ratio of the differential-mode power (transmission signal of a balanced pair) to the common-mode power (signal in the pair to ground/earth unba

31、lanced circuit) measured at the near and at the far end Note 1 to entry: The (operational) unbalance attenuation is described by the logarithmic ratio of the differential-mode power to the common-mode power in standard operational conditions. If not otherwise specified, e.g. by product specification

32、s, the standard operational conditions are a differential-mode which is matched with its nominal characteristic impedance (e.g. 100 ) and a common-mode which is loaded with 50 . uPZa= = +diff diff comcom com diffU10 20 10Ulg lg lg (1) where Pdiff is the power in the differential-mode (balanced) circ

33、uit; BS EN 50289-1-9:2017 EN 50289-1-9:2017 (E) 5 Pcom is the power in the common-mode (unbalanced) circuit; Udiff is the voltage in the differential-mode (balanced) circuit; Ucom is the voltage in the common-mode (unbalanced) circuit; Zdiff is the characteristic impedance of the differential-mode (

34、balanced) circuit; Zcom is the characteristic impedance of the common-mode (unbalanced) circuit. 3.2 transverse conversion loss TCL logarithmic ratio of the differential-mode injected signal at the near end to the resultant common-mode signal at the near end of a balanced pair, and which is equal to

35、 unbalance attenuation at near end when the CUT is terminated with the same impedances as defined for unbalance attenuation measurement Note 1 to entry: This definition stems from ITU-G.117. 3.3 transverse conversion transfer loss TCTL logarithmic ratio of the differential-mode injected signal at th

36、e near end to the resultant common-mode signal at the far end of a balanced pair, and which is equal to unbalance attenuation at far end when the CUT is terminated with the same impedances as defined for unbalance attenuation measurement Note 1 to entry: This definition stems from ITU-G.117. 4 Test

37、method 4.1 Method A: measurement using balun setup 4.1.1 Test equipment a) It is mandatory to create a defined return (common-mode) path. This is achieved by grounding all otherpairs and screen(s) if present in common to the balun ground. However in addition in the case ofunscreened cables the cable

38、 under test shall be wound onto a grounded metal drum. The drum surfacemay have a suitable groove, wide enough to contain the cable, and shall be adequate to hold 100 m ofcable in one layer. The pair under test shall be terminated with differential-mode and common-modeterminations and grounded at ne

39、ar and far endsb) A network analyser or generator/receiver combination suitable for the required frequency and dynamicrange.c) The baluns shall have a common-mode port and the characteristics given in EN 50289-1-1:2017,Table 1.d) Time domain reflectometer (optional).4.1.2 Test sample The ends of the

40、 cable under test (CUT) shall be prepared so that the twisting of the pairs/quads is maintained up to the terminals of the test equipment. If not otherwise specified the CUT shall have a length of 100 m 1 m. For the measurement or evaluation of the equal level unbalance attenuation at the far end th

41、e following applies: if the CUT length is not otherwise specified and the attenuation of the CUT at the highest frequency to be measured is higher than or equal to 80 dB the length of the CUT may be reduced to limit the attenuation to maximum 80 dB. All pairs not under test and all screens shall be

42、connected in common to the same ground as the balun at both ends of the CUT. BS EN 50289-1-9:2017EN 50289-1-9:2017 (E) 6 For unscreened cables the CUT shall be wound tightly around the metal drum in one layer. The distance between the windings should be at least the diameter of the cable. The metal

43、drum shall be connected to the same ground as the balun, e.g. by fixing the baluns to the drum. 4.1.3 Calibration procedure a) The reference line calibration (0 dB-line) shall be determined by connecting coaxial cables between theanalyser input and output. The same coaxial cables shall also be used

44、for the balun loss and unbalance attenuation measurements. The calibration shall be established over the whole frequency range specified in the relevant cable specification. This calibration method is valid for closely matched baluns that satisfy the characteristics of Table 1. b) Figure 1 gives the

45、 schematic for the measurement of the differential-mode loss of the baluns. Two balunsare connected back to back on the symmetrical output side and their attenuation measured over the specified frequency range. The connection between the two baluns shall be made with negligible loss. Key U0voltage a

46、t network analyser port or signal generator U1voltage at network analyser port or receiver Udiffvoltage at symmetrical port of baluns Figure 1 Test set-up for the measurement of the differential-mode loss of the baluns The differential-mode loss of the baluns is given by: ( )USU= =01diff 210 5 20 lg

47、 0 5 20, , lg (2) where diffis the differential-mode loss of the balun (dB); S21is the scattering parameter S21(forward transmission coefficient) where port 1 is the primary (unbalanced side) side of the near end balun and port 2 is the primary side (unbalanced port) of the far end balun. BS EN 5028

48、9-1-9:2017 EN 50289-1-9:2017 (E) 7 c) Figure 2 gives the schematic for the measurement of the common-mode loss of the baluns. The balunsused in b) are connected together; the unbalanced balun ports are terminated with the nominal testequipment impedance, the test equipment is connected to the common

49、-mode ports (centre taps) of thebaluns.Key U0voltage at network analyser port or signal generator U1voltage at network analyser port or receiver Figure 2 Test set-up for the measurement of the common-mode loss of the baluns The common-mode loss of the baluns is given by: ( )USU= =01com 210 5 20 0 5 20, lg , lg (3) where comis the common-mode loss of the balun (dB); S21is the scattering parameter S21(forward transmission coeffic