1、 IEC 61280-4-1 Edition 2.0 2009-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Fibre-optic communication subsystem test procedures Part 4-1: Installed cable plant Multimode attenuation measurement Procdures dessai des sous-systmes de tlcommunication fibres optiques Partie 4-1: Installations cbles Me
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16、ublication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61280-4-1 Edition 2.0 2009-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Fibre-optic communication subsystem test procedures Part 4-1: Inst
17、alled cable plant Multimode attenuation measurement Procdures dessai des sous-systmes de tlcommunication fibres optiques Partie 4-1: Installations cbles Mesure de laffaiblissement en multimodal INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XB ICS 33.180.01 PRIC
18、E CODE CODE PRIX ISBN 978-2-88912-046-8 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale colour inside 2 61280-4-1 IEC:2009 CONTENTS FOREWORD.5 1 Scope.7 2 Normative references .7 3 Terms, definitions, graphical symbo
19、ls 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
20、to 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/dumm
21、y cord .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.
22、3 Inspect 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
23、 method.19 Annex B (normative) Three-cord reference method21 61280-4-1 IEC:2009 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 measurement .32 Annex F (informati
24、ve) Measurement uncertainty examples.35 Annex G (informative) OTDR configuration information44 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 Figure 1d Pow
25、er 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 C.2 Test meas
26、urement24 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 F 1 and F 2 .29 Figure D.4 Graphic construction of F 1 , F 11 , F 12 and F 2 30 Figure E.1 En
27、circled 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 centred40 Figure F.6 EF underfilling.40 Figure F.7 EF overfilling.41 Figure F.8 L1 loss
28、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 conditionin
29、g.43 Figure G.1 Splice and macro bend attenuation measurement.47 Figure G.2 Attenuation measurement with high reflection connectors.48 4 61280-4-1 IEC:2009 Figure G.3 Attenuation measurement of a short length cabling.49 Figure G.4 OTDR trace with ghost .50 Figure G.5 Cursors positioning.51 Figure H.
30、1 Obtaining reference power level P 0 .54 Figure H.2 Obtaining power level P 1 55 Figure H.3 Obtaining reference power level P 0 .56 Figure H.4 Obtaining power level P 1 56 Figure H.5 Obtaining reference power level P 0 .57 Figure H.6 Obtaining power level .57 Figure H.7 Obtaining reference power le
31、vel P 0 .58 Figure H.8 Obtaining power level P 1 58 Figure H.9 Obtaining power level P 5 58 Figure H.10 Obtaining reference power level P 0 .59 Figure H.11 Obtaining power level P 1 .59 Table 1 Cabling configurations.12 Table 2 Test methods and configurations.12 Table 3 Spectral requirements .14 Tab
32、le 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 cabling at 1 3
33、00 nm.34 Table F.1 Expected loss for examples (note 1).35 Table G.1 Default effective group index of refraction values.46 61280-4-1 IEC:2009 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE-OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 4-1: Installed cable plant Multimode attenuation measure
34、ment FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization i
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43、publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the po
44、ssibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61280-4-1 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC
45、 technical committee 86: Fibre optics. This second edition cancels and replaces the first edition, published in 2003, and constitutes a technical revision. The main changes with respect to the previous edition are listed below: An additional measurement method based on optical time domain reflectome
46、try (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 changed from one based on coupled power ratio (CPR) and mandrel requirement to one based on measurements of the near field at t
47、he output of the launching test cord. 6 61280-4-1 IEC:2009 Highlighting the importance of, and giving guidance on, good measurement practices including cleaning and inspection of connector end faces. This bilingual version (2010-07) replaces the English version. The text of this standard is based on
48、 the following documents: FDIS Report on voting 86C/879/FDIS 86C/892/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 61280 series, under the general title Fibre-optic communication subsystem test procedure, can be found on the IEC website. For the Part 4, the new subtitle will be Installed cable plant. Subtitles of existin
