1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic communication subsystem test procedures Part 41: Installed cable plant Multimode attenuation measurementBS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHIN
2、A STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSINational forewordThis British Standard is the UK implementation of EN 61280-4-1:2009. It isidentical to IEC 61280-4-1:2009. It supersedes BS EN 61280-4-1:2004 whichis withdrawn.The UK participation in its preparation was entrusted by Technical
3、 CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems andactive devices.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsib
4、le for its correct application. BSI 2010ISBN 978 0 580 57326 2ICS 33.180.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 January 2010Amendments issued since p
5、ublicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61280-4-1 NORME EUROPENNE EUROPISCHE NORM December 2009 CENELEC European Committee for Electrotechnical Sta
6、ndardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61280-4-1:
7、2009 E ICS 33.180.01 Supersedes EN 61280-4-1:2004English version Fibre optic communication subsystem test procedures - Part 4-1: Installed cable plant - Multimode attenuation measurement (IEC 61280-4-1:2009) Procdures dessai des sous-systmes de tlcommunication fibres optiques - Partie 4-1: Installat
8、ion cble - Mesure de laffaiblissement en multimodal(CEI 61280-4-1:2009) Prfverfahren fr Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-1: Lichtwellenleiter-Kabelanlagen - Mehrmoden-Dmpfungsmessungen (IEC 61280-4-1:2009) This European Standard was approved by CENELEC on 2009-10-01. CENELEC mem
9、bers 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 such national standards may be obtained on applicat
10、ion 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 own language and notified to the Central Secretariat
11、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, Italy, Latvia, Lithuania, Luxembourg, Malta, the Nether
12、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSIEN 61280-4-1:2009 - 2 - Foreword The text of document 86C/879/FDIS,
13、future edition 2 of IEC 61280-4-1, prepared by SC 86C, Fibre optic systems and active devices, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61280-4-1 on 2009-10-01. This European Standard supersedes EN 61280-4-1:2004. The main changes w
14、ith respect to EN 61280-4-1:2004 are listed below: an additional measurement method based on optical time domain reflectometry (OTDR) is documented, with guidance on best practice in using the OTDR and interpreting OTDR traces; the requirement for the sources used to measure multimode fibres is chan
15、ged from one based on coupled power ratio (CPR) and mandrel requirement to one based on measurements of the near field at the output of the launching test cord; highlighting the importance of, and giving guidance on, good measurement practices including cleaning and inspection of connector end faces
16、. 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) 2010-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-10-01 Annex ZA
17、 has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61280-4-1:2009 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 60793-1
18、-40 NOTE Harmonized as EN 60793-1-40:2003 (modified). IEC 60793-2 NOTE Harmonized as EN 60793-2:2008 (not modified). IEC 60793-2-10 NOTE Harmonized as EN 60793-2-10:2007 (not modified). IEC 60793-2-50 NOTE Harmonized as EN 60793-2-50:2008 (not modified). IEC 61300-3-6 NOTE Harmonized as EN 61300-3-6
19、:2009 (not modified). _ BS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSI- 3 - EN 61280-4-1:2009 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following
20、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 (including any amendments) applies. NOTE When an international publication has been modified by com
21、mon modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60825-2 -1)Safety of laser products - Part 2: Safety of optical fibre communication systems (OFCS) EN 60825-2 20042)IEC 61280-1-3 -3)Fibre optic communication subsystem test procedures - Part 1-3
22、: General communication subsystems - Central wavelength and spectral width measurement EN 61280-1-3 -3)IEC 61280-1-4 -1)Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method EN 61280-1-4 200X4)IEC/PAS 61300-3
23、-35 -1)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-35: Examinations and measurements - Fibre optic cylindrical connector endface visual inspection - - IEC 61315 -1)Calibration of fibre-optic power meters EN 61315 20062)IEC 61745 -1)End-
24、face image analysis procedure for the calibration of optical fibre geometry test sets - - IEC 61746 -1)Calibration of optical time-domain reflectometers (OTDR) EN 61746 20052)1)Undated reference. 2)Valid edition at date of issue. 3)At draft stage. 4)To be ratified. BS EN 61280-4-1:2009Licensed Copy:
25、 Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSI 2 61280-4-1 IEC:2009(E) CONTENTS 1 Scope.7 2 Normative references .7 3 Terms, definitions, graphical symbols and acronyms 8 3.1 Terms and definitions 8 3.2 Graphical symbols.9 3.3 Acronyms 11 4 Measurement methods
26、.11 4.1 General .11 4.2 Cabling configurations and applicable test methods 12 4.3 Overview of uncertainties 12 4.3.1 General .12 4.3.2 Test cords .13 4.3.3 Launch conditions at the connection to the cabling under test .13 4.3.4 Optical source .13 4.3.5 Output power reference .13 4.3.6 Received power
27、 reference .14 5 Apparatus.14 5.1 General .14 5.2 Light source 14 5.2.1 Stability .14 5.2.2 Spectral characteristics .14 5.2.3 Launch cord 14 5.3 Receive or tail cord .15 5.4 Substitution/dummy cord .15 5.5 Power meter LSPM methods only.15 5.6 OTDR apparatus .15 5.7 Connector end-face cleaning and i
28、nspection equipment 16 5.8 Adapters .16 6 Procedures.16 6.1 General .16 6.2 Common procedures .17 6.2.1 Care of the test cords 17 6.2.2 Make reference measurements (LSPM methods only) .17 6.2.3 Inspect and clean the ends of the fibres in the cabling.17 6.2.4 Make the measurements17 6.2.5 Make the ca
29、lculations 17 6.3 Calibration.17 6.4 Safety .17 7 Calculations .17 8 Documentation .18 8.1 Information for each test18 8.2 Information to be available 18 Annex A (normative) One-cord reference method.19 Annex B (normative) Three-cord reference method 21 BS EN 61280-4-1:2009Licensed Copy: Wang Bin, I
30、SO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSI61280-4-1 IEC:2009(E) 3 Annex C (normative) Two-cord reference method 23 Annex D (normative) Optical time domain reflectometer.26 Annex E (normative) Requirements for the source characteristics for multimode measurement32 Annex
31、 F (informative) Measurement uncertainty examples.35 Annex G (informative) OTDR configuration information 44 Annex H (informative) Test cord insertion loss verification .53 Bibliography61 Figure 1a Socket and plug assembly10 Figure 1b Connector set (plug, adapter, plug) 10 Figure 1c Light source .10
32、 Figure 1d Power meter.10 Figure 1 Connector symbols 10 Figure 2 Symbol for cabling under test.10 Figure 3 OTDR schematic16 Figure A.1 Reference measurement.20 Figure A.2 Test measurement 20 Figure B.1 Reference measurement.22 Figure B.2 Test measurement 22 Figure C.1 Reference measurement.24 Figure
33、 C.2 Test measurement24 Figure C.3 Test measurement for plug-socket style connectors24 Figure D.1 Test measurement for Method D.27 Figure D.2 Location of the cabling under test ports 28 Figure D.3 Graphic construction of F1 and F2.29 Figure D.4 Graphic construction of F1, F11, F12 and F230 Figure E.
34、1 Encircled flux template example33 Figure F.1 Initial power measurement 37 Figure F.2 Verification of reference grade connection 38 Figure F.3 Two offset splices .38 Figure F.4 Five offset splices .38 Figure F.5 EF centred 40 Figure F.6 EF underfilling.40 Figure F.7 EF overfilling.41 Figure F.8 L1
35、loss with mandrel .41 Figure F.9 L1 loss with mandrel and mode conditioner.42 Figure F.10 L2 loss (adjusted) with mandrel.42 Figure F.11 L2 loss (adjusted) with mandrel and mode conditioning.42 Figure F.12 L3 loss (adjusted) with mandrel.43 Figure F.13 L3 loss (adjusted) with mandrel and mode condit
36、ioning.43 Figure G.1 Splice and macro bend attenuation measurement.47 Figure G.2 Attenuation measurement with high reflection connectors.48 BS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSI 4 61280-4-1 IEC:2009(E) Figure G.3 Atten
37、uation measurement of a short length cabling.49 Figure G.4 OTDR trace with ghost .50 Figure G.5 Cursors positioning.51 Figure H.1 Obtaining reference power level P0.54 Figure H.2 Obtaining power level P155 Figure H.3 Obtaining reference power level P0.56 Figure H.4 Obtaining power level P156 Figure
38、H.5 Obtaining reference power level P0.57 Figure H.6 Obtaining power level .57 Figure H.7 Obtaining reference power level P0.58 Figure H.8 Obtaining power level P158 Figure H.9 Obtaining power level P558 Figure H.10 Obtaining reference power level P0.59 Figure H.11 Obtaining power level P1.59 Table
39、1 Cabling configurations.12 Table 2 Test methods and configurations.12 Table 3 Spectral requirements .14 Table E.1 Threshold tolerance .33 Table E.2 EF requirements for 50 m core fibre cabling at 850 nm 34 Table E.3 EF requirements for 50 m core fibre cabling at 1 300 nm .34 Table E.4 EF requirement
40、s for 62,5 m core fibre cabling at 850 nm .34 Table E.5 EF requirements for 62,5 m core fibre cabling at 1 300 nm.34 Table F.1 Expected loss for examples (note 1).35 Table G.1 Default effective group index of refraction values.46 BS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDA
41、RDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSI61280-4-1 IEC:2009(E) 7 FIBRE-OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 4-1: Installed cable plant Multimode attenuation measurement 1 Scope This part of IEC 61280-4 is applicable to the measurement of attenuation of installed fibre-optic cab
42、ling using multimode fibre, typically in lengths of up to 2 000 m. This cabling can include multimode fibres, connectors, adapters and splices. Cabling design standards such as ISO/IEC 11801, ISO/IEC 24702 and ISO/IEC 24764 contain specifications for this type of cabling. ISO/IEC 14763-3, which supp
43、orts these design standards, makes reference to the test methods of this standard. In this standard, the fibre types that are addressed include category A1a (50/125 m) and A1b (62,5/125 m) multimode fibres, as specified in IEC 60793-2-10. The attenuation measurements of the other multimode categorie
44、s can be made, using the approaches of this standard, but the source conditions for the other categories have not been defined. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For
45、undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60825-2, Safety of laser products Part 2: Safety of optical fibre communication systems (OFCS) IEC 61280-1-3, Fibre optic communication subsystem basic test procedures Part 1-3: Test procedures
46、for general communication subsystems Central wavelength and spectral width measurement IEC 61280-1-4, Fibre optic communication subsystem test procedures Part 1-4: General communication subsystems Light source encircled flux measurement method1IEC 61300-3-35, Fibre optic interconnecting devices and
47、passive components Basic test and measurement procedures Part 3-35: Examinations and measurements Fibre optic cylindrical connector endface visual inspection IEC 61315, Calibration of fibre-optic power meters IEC 61745, End-face image analysis procedure for the calibration of optical fibre geometry
48、test sets IEC 61746, Calibration of optical time-domain reflectometers (OTDRs) 1A new edition is in preparation. BS EN 61280-4-1:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/04/2010 03:38, Uncontrolled Copy, (c) BSI 8 61280-4-1 IEC:2009(E) 3 Terms, definitions, graphical symbols and
49、 acronyms For the purposes of this document, the following terms, definitions, graphical symbols and acronyms apply. 3.1 Terms and definitions 3.1.1 attenuation reduction of optical power induced by transmission through a medium such as cabling, given as L (dB) L = 10 log10(Pin/Pout) where Pinand Poutare the power, typically measured in m
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