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 61280-4-1:2009National forewordThis British Standard is
2、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 It supersedes BS EN 61280-4-1:2004 whichis withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems andactive devices.A l
3、ist 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 responsible for its correct application. BSI 2010ISBN 978 0 580 57326 2ICS 33.180.01Compliance with a Britis
4、h 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 publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61280-4-1:2009EUROPEAN STANDARD EN 61280
5、-4-1 NORME EUROPENNE EUROPISCHE NORM December 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of ex
6、ploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61280-4-1:2009 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-
7、4-1:2009) Procdures dessai des sous-systmes de tlcommunication fibres optiques - Partie 4-1: Installation cble - Mesure de laffaiblissement en multimodal(CEI 61280-4-1:2009) Prfverfahren fr Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-1: Lichtwellenleiter-Kabelanlagen - Mehrmoden-Dmpfungsme
8、ssungen (IEC 61280-4-1:2009) This European Standard was approved by CENELEC on 2009-10-01. 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-da
9、te 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 version in any other language made by translation under
10、 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, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Franc
11、e, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61280-4-1:2009EN 61280-4-1:2009 - 2 - Foreword The text of document 86C/879/FDI
12、S, 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 change
13、s with 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 c
14、hanged 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 fa
15、ces. 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
16、 ZA 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 6079
17、3-1-40 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-
18、3-6:2009 (not modified). _ BS EN 61280-4-1:2009- 3 - EN 61280-4-1:2009 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated reference
19、s, 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 common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD
20、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: General communication subsystems - Central wavelength and spectral width measurement EN 61280-
21、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 61300-3-35 -1)Fibre optic interconnecting devices and passive components - Basic test and measurement p
22、rocedures - 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-face image analysis procedure for the calibration of optical fibre geometry test sets - - IEC 61
23、746 -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 61280-4-1:2009 2 61280-4-1 IEC:2009(E) CONTENTS 1 Scope.7 2 Normative references .7 3 Terms, definitions, graphical symbols
24、and acronyms 8 3.1 Terms and definitions 8 3.2 Graphical symbols.9 3.3 Acronyms 11 4 Measurement methods .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
25、the cabling under test .13 4.3.4 Optical source .13 4.3.5 Output power reference .13 4.3.6 Received power 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 c
26、ord .15 5.5 Power meter LSPM methods only.15 5.6 OTDR apparatus .15 5.7 Connector end-face cleaning and inspection 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 I
27、nspect and clean the ends of the fibres in the cabling.17 6.2.4 Make the measurements17 6.2.5 Make the calculations 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 me
28、thod.19 Annex B (normative) Three-cord reference method 21 BS EN 61280-4-1:200961280-4-1 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
29、 Annex 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 sour
30、ce .10 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
31、Figure 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 Fig
32、ure E.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
33、.8 L1 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
34、conditioning.43 Figure G.1 Splice and macro bend attenuation measurement.47 Figure G.2 Attenuation measurement with high reflection connectors.48 BS EN 61280-4-1:2009 4 61280-4-1 IEC:2009(E) Figure G.3 Attenuation measurement of a short length cabling.49 Figure G.4 OTDR trace with ghost .50 Figure G
35、.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 H.5 Obtaining reference power level P0.57 Figure H.6 Obtaining power level .57 Figure H.7 Obt
36、aining 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 1 Cabling configurations.12 Table 2 Test methods and configurations.12 Table 3 Spectral requi
37、rements .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 requirements for 62,5 m core fibre cabling at 850 nm .34 Table E.5 EF requirements for 62,5 m core fibre
38、 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 61280-4-1:200961280-4-1 IEC:2009(E) 7 FIBRE-OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 4-1: Installed cable plant Multimode attenuation measurement 1
39、 Scope This part of IEC 61280-4 is applicable to the measurement of attenuation of installed fibre-optic cabling 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,
40、ISO/IEC 24702 and ISO/IEC 24764 contain specifications for this type of cabling. ISO/IEC 14763-3, which supports 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) mul
41、timode fibres, as specified in IEC 60793-2-10. The attenuation measurements of the other multimode categories 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 in
42、dispensable 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. IEC 60825-2, Safety of laser products Part 2: Safety of optical fibre communication system
43、s (OFCS) IEC 61280-1-3, Fibre optic communication subsystem basic test procedures Part 1-3: Test procedures 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 subsys
44、tems Light source encircled flux measurement method1IEC 61300-3-35, 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, Calibration of fibre-op
45、tic power meters IEC 61745, End-face image analysis procedure for the calibration of optical fibre geometry test sets IEC 61746, Calibration of optical time-domain reflectometers (OTDRs) 1A new edition is in preparation. BS EN 61280-4-1:2009 8 61280-4-1 IEC:2009(E) 3 Terms, definitions, graphical sy
46、mbols and 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
47、Pinand Poutare the power, typically measured in mW, into and out of the cabling 3.1.2 light source power meter LSPM test system consisting of a light source (LS), power meter (PM) and associated test cords used to measure the attenuation of installed cable plant 3.1.3 optical time domain reflectomet
48、er OTDR test system consisting of an optical time-domain reflectometer and associated test cords used to characterize and measure the attenuation of installed cable plant and specific elements within that cable plant 3.1.4 test cord terminated optical fibre cord used to connect the optical source or
49、 detector to the cabling, or to provide suitable interfaces to the cabling under test NOTE There are five types of test cords: launch cord: used to connect the light source to the cabling; receive cord: used to connect the cabling to the power meter (LSPM only); tail cord: attached to the far end of the cabling when an OTDR is used
