1、BRITISH STANDARD BS EN 50289-1-15: 2004 Communication cables Specifications for test methods Part 1-15: Electromagnetic performance Coupling attenuation of links and channels (Laboratory conditions) The European Standard EN 50289-1-15:2004 has the status of a British Standard ICS 33.120.10 BS EN 502
2、89-1-15:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 July 2004 BSI 14 July 2004 ISBN 0 580 44065 6 National foreword This British Standard is the official English language version of EN 50289-1-15:2004. The UK participation in its
3、preparation was entrusted to Technical Committee EPL/46, Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-refere
4、nces The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British
5、Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to
6、 the responsible European committee any 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. Summary of pages This document comprises a front cover, an inside front cover,
7、the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-1-15 NORME EUROPENNE EUROPISCHE NORM June 200
8、4 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 2004 CENELEC - All rights of exploitation in any form and by any means reserve
9、d worldwide for CENELEC members. Ref. No. EN 50289-1-15:2004 E ICS 33.120.10 English version Communication cables Specifications for test methods Part 1-15: Electromagnetic performance Coupling attenuation of links and channels (Laboratory conditions) Cbles de communication Spcifications des mthodes
10、 dessai Partie 1-15: Performance lectromagntique Affaiblissement de couplage densembles de cbles (Conditions de laboratoire) Kommunikationskabel Spezifikationen fr Prfverfahren Teil 1-15: Elektromagnetisches Verhalten - Kopplungsdmpfung fr konfektionierte Kabel unter Laborbedingungen This European S
11、tandard was approved by CENELEC on 2004-02-01. 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 conc
12、erning 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
13、 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv
14、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50289-1-15:2004 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was
15、 submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50289-1-15 on 2004-02-01. 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) 2005-02-01 latest dat
16、e by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-02-01 _ - 3 - EN 50289-1-15:2004 Contents 1 Scope 4 2 Normative references4 3 Definitions4 4 Test method 4 4.1 Equipment.4 4.1.1 General.4 4.1.2 Balun requirements.5 4.1.3 Extension cable requirements 6 4.2 Tes
17、t sample 7 4.2.0 General .7 4.2.1 Length of extension cables .7 4.2.2 Tested length 7 4.2.3 Preparation of test sample7 4.2.3.1 Balanced cable assemblies.8 4.2.3.2 Multi-conductor links or channels .8 4.2.3.3 Coaxial links and channels8 4.3 Calibration procedure8 4.4 Test set-up 8 4.4.1 General .8 4
18、.4.2 Test set-up verification9 4.4.2.1 Determination of measurement sensitivity of the set-up .9 4.4.2.2 Verification of test set-up calibration10 4.4.2.3 Pulling force on patch cords 10 4.5 Measuring procedure 10 4.5.1 Example of link measurement 10 5 Expression of test results 11 6 Test report .11
19、 6.1 General .11 6.2 Evaluation of test results (informative)12 Bibliography .14 Figure 1 - Measurement of surface wave at at connecting hardware in one end of a link or channel 5 Figure 2 - Termination of link or channel or applied extension cable 8 Figure 3 - Test set-up for a near end measurement
20、 of the first connecting hardware of a link or channel.9 Figure 4 - Example of a four-connector link configuration as defined in EN 50173 11 Figure 5 - First tested part of the link.11 Figure 6 - Second tested part of the link11 Figure 7 - Last tested part of the link .12 Figure 8 - Typical measurem
21、ent of an unscreened channel .13 Figure 9 - Typical measurement of a screened balanced channel14 Table 1 - Balun performance characteristics 6 EN 50289-1-15:2004 - 4 - 1 Scope This Part 1-15 of EN 50289 details the method of laboratory test to determine the coupling attenuation for links and channel
22、s used in analogue and digital communication systems. It is to be read in conjunction with EN 50289-1-6. 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
23、 latest edition of the referenced document (including any amendments) applies. EN 50289-1-6 Communication cables Specification for test methods Part 1-6: Electrical test methods Electromagnetic performance EN 50290-1-2 1)Communication cables Part 1-2: Definitions 3 Definitions For the purposes of th
24、is European Standard, the definitions of EN 50290-1-2 and EN 50289-1-6 apply. 4 Test method 4.1 Equipment 4.1.1 General See EN 50289-1-6, subclause 9.2.1.1 and Figure 1 below. 1)Under consideration. - 5 - EN 50289-1-15:2004 600 cm 10 cmKey 0 signal generator, output impedance Z 0 1 link or channel u
25、nder test, nominal characteristic impedance Z 1 2 outer circuit of the link or channel under test, impedance Z 2 3 absorbing clamp, impedance Z 3 4 measuring receiver 5 balun (if applicable) 6 current transformer 7 measuring receiver cable (use the same in measurement and calibration) 8 absorber (fe
26、rrite tube) of the clamp, insertion loss 10 dB 9 absorber (or second clamp), insertion loss 10 dB 10 termination of the far end extension cable connected to link or channel under test 11 shield of signal generator and balun if needed for high dynamic range 12 reflector plate 13 extension cable conne
27、cted through mating connector to link or channel under test, if applicable 14 connecting hardware in measured end of link or channel Figure 1 - Measurement of surface wave at connecting hardware in one end of a link or channel 4.1.2 Balun requirements For measurement of symmetrical cable assemblies,
28、 a means for generating symmetrical signals shall be provided. If the generator is unbalanced, this may be performed by the use of a balun or 180 power splitter. The minimum requirements for this device are specified in Table 1. The attenuation of the balun shall be kept as low as possible because i
29、t will limit the dynamic range of the coupling attenuation or screening attenuation measurements. EN 50289-1-15:2004 - 6 - Table 1 - Balun performance characteristics Parameter Value Impedance, primary 1)50 (unbalanced) Impedance, secondary 2)100 or 150 (balanced) Operational attenuation 4)(includin
30、g matching pads if used) 10 dB Return loss, bi-directional 6 dB Power rating To accommodate the power of the generator and amplifier (if applicable) Output signal balance 3) 50 dB from 30 MHz to 100 MHz 30 dB from 100 MHz to the highest measured frequency. 1)Primary impedance may differ if necessary
31、 to accommodate analyzer outputs other than 50 . 2)Balanced outputs of the test baluns shall be matched to the nominal impedance of the symmetrical patch cord / cable pair. 100 shall be used for termination of 120 cabling. 3)Measured per ITU-T Recommendations G.117 and O.9 4)The operational attenuat
32、ion of a balun shall be mathematically deduced from 3 operational attenuation measurements with 3 baluns back-to-back 4.1.3 Extension cable requirements An extension cable is only required if the channel or link under test does not include a cable, which can be connected to the test set-up. Unscreen
33、ed extension cables shall be used for testing unscreened, balanced link or channels. Screened, balanced extension cables shall be used for testing screened, balanced cable assemblies. Unbalanced (coaxial) extension cables shall be used for testing unbalanced cable assemblies. The electrical transmis
34、sion performance including electromagnetic screening and unbalance attenuation of the extension cables shall be better or equal to the performance of the link or channel under test. The choice of the extension cable should assure the minimum insertion loss and reflection loss of the set-up possible.
35、 The extension cables shall have the same nominal characteristic impedance as the link or channel under test. Likewise the velocity of propagation of the extension cables shall correspond to the link or channel under test (same type of isolation e.g. foamed or solid). The insertion loss of a near en
36、d extension cable including mating connector, if applicable, shall be less than 2,0 dB up to the highest measurement frequency. The insertion loss of set-up validation cable shall be less than the insertion loss of any cable included in the link or channel under test. The extension cables, any matin
37、g connectors and the connection between extension cables and the mating connectors, if applicable, shall have a balance or screening or balance and screening as good as possible. To further enhance the measurement sensitivity the connection between the mating connector and the extension cable may be
38、 improved since it does not form part of the device under test. It is not allowed to improve any contact between the connecting hardware of the link or channel under test and the mating connector of the extension cable, if applicable. The measurement sensitivity shall be 6 dB better than the specifi
39、ed requirement limit for the link or channel under test. See 4.4.2.1 for determination of the measurement sensitivity. In case of doubt regarding the interoperability between any mating connector and the connecting hardware of the link or channel under test, it is recommended to use the mating conne
40、ctor specified or advised by the supplier of the connecting hardware of the link or channel under test. - 7 - EN 50289-1-15:2004 4.2 Test sample 4.2.0 General The test sample consists of the link or channel under test, and, in each end where it ends in a connecting hardware component, also an extens
41、ion cable equipped with or without a mating connector. In the near end any extension cable is used to connect the link or channel with the balun (if applied), network analyzer or signal generator. In the far end an extension cable may be used to apply end termination. The extension cable may also be
42、 used to adjust the entire length to 10 m including near end extension cable (for shorter links or channels). If the length of the link or channel under test is longer than 9 m a 1 m far end extension cable may be used for the termination. The sample therefore consists of one extension cable with ma
43、ting connector in the near end of the link or channel under test, if applicable, one extension cable with mating connector in the far end of the link or channel under test, if applicable, a number of connecting hardware contained in the link or channel under test, a number of cables contained in the
44、 link or channel under test 4.2.1 Length of extension cables The min. length of extension cables with mating connectors, if applicable, is different for near end (reflector plate end) and far end (termination end). A: Extension cable at reflector plate (near end) The length of the near end extension
45、 cable, if applicable, shall be 100 cm 10 cm. B: Extension cable in termination end (far end) The entire length of link or channel including any near and far end extension cables shall be 10 m 0,5 m or 1 m 0,5 m longer than link or channel including near end extension cable, whichever is the longest
46、. 4.2.2 Tested length The effective test length of each measurement is limited by the absorbing clamp and the ferrite tube, as shown in Figure 1. This length shall be 600 cm 10 cm. 4.2.3 Preparation of test sample The diameter of any extension cables must be selected to allow insertion in the bore o
47、f the absorbing clamp. When a special type of socket interface is specified for termination of the link or channel such interface shall be used in the mating connector in question. The bore of the absorbing clamp shall be larger than the diameter the cables of the measured parts of the link or chann
48、el under test. EN 50289-1-15:2004 - 8 - 4.2.3.1 Balanced cable assemblies Differential and common mode terminations are required for each unmeasured pair at the near end of the link or channel or any applied extension cable, see Figure 2. Differential and common mode terminations are required for ea
49、ch pair at the far end of the link or channel or any applied extension cable, see Figure 2. R 2 R 1 R 1 Signal pair Cable screenFigure 2 - Termination of link or channel or applied extension cable The values of the R 1resistors shall be one half the nominal characteristic impedance of the cable(s) of the link or channel. NOTE For 100 balanced cabling the common mode impedance will be equal to 25 when R 2 is short-circu
