BS EN 61280-4-1:2009:2010 Edition
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Fibre optic communication subsystem test procedures – Installed cable plant. Multimode attenuation measurement
| Published By | Publication Date | Number of Pages |
| BSI | 2010 | 66 |
This part of IEC 61280-4 is applicable to the measurement of attenuation of installed fibreoptic 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, 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 μm) and A1b (62,5/125 μm) multimode 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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | CONTENTS |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms, definitions, graphical symbols and acronyms 3.1 Terms and definitions |
| 11 | 3.2 Graphical symbols |
| 12 | Figures Figure 1a – Socket and plug assembly Figure 1b – Connector set (plug, adapter, plug) Figure 1c – Light source Figure 1d – Power meter Figure 1 – Connector symbols Figure 2 – Symbol for cabling under test |
| 13 | 3.3 Acronyms 4 Measurement methods 4.1 General |
| 14 | 4.2 Cabling configurations and applicable test methods 4.3 Overview of uncertainties Tables Table 1 – Cabling configurations Table 2 – Test methods and configurations |
| 16 | 5 Apparatus 5.1 General 5.2 Light source Table 3 – Spectral requirements |
| 17 | 5.3 Receive or tail cord 5.4 Substitution/dummy cord 5.5 Power meter – LSPM methods only 5.6 OTDR apparatus |
| 18 | 5.7 Connector end-face cleaning and inspection equipment 5.8 Adapters 6 Procedures 6.1 General Figure 3 – OTDR schematic |
| 19 | 6.2 Common procedures 6.3 Calibration 6.4 Safety 7 Calculations |
| 20 | 8 Documentation 8.1 Information for each test 8.2 Information to be available |
| 21 | Annex A (normative) One-cord reference method |
| 22 | Figure A.1 – Reference measurement Figure A.2 – Test measurement |
| 23 | Annex B (normative) Three-cord reference method |
| 24 | Figure B.1 – Reference measurement Figure B.2 – Test measurement |
| 25 | Annex C (normative) Two-cord reference method |
| 26 | Figure C.1 – Reference measurement Figure C.2 – Test measurement Figure C.3 – Test measurement for plug-socket style connectors |
| 28 | Annex D (normative) Optical time domain reflectometer |
| 29 | Figure D.1 – Test measurement for Method D |
| 30 | Figure D.2 – Location of the cabling under test ports |
| 31 | Figure D.3 – Graphic construction of F1 and F2 |
| 32 | Figure D.4 – Graphic construction of F1, F11, F12 and F2 |
| 34 | Annex E (normative) Requirements for the source characteristics for multimode measurement |
| 35 | Figure E.1 – Encircled flux template example Table E.1 – Threshold tolerance |
| 36 | Table E.2 – EF requirements for 50 um core fibre cabling at 850 nm Table E.3 – EF requirements for 50 um core fibre cabling at 1 300 nm Table E.4 – EF requirements for 62,5 um core fibre cabling at 850 nm Table E.5 – EF requirements for 62,5 um core fibre cabling at 1 300 nm |
| 37 | Annex F (informative) Measurement uncertainty examples Table F.1 – Expected loss for examples (Note 1) |
| 39 | Figure F.1 – Initial power measurement |
| 40 | Figure F.2 – Verification of reference grade connection Figure F.3 – Two offset splices Figure F.4 – Five offset splices |
| 42 | Figure F.5 – EF centred Figure F.6 – EF underfilling |
| 43 | Figure F.7 – EF overfilling Figure F.8 – L1 loss with mandrel |
| 44 | Figure F.9 – L1 loss with mandrel and mode conditioner Figure F.10 – L2 loss (adjusted) with mandrel Figure F.11 – L2 loss (adjusted) with mandrel and mode conditioning |
| 45 | Figure F.12 – L3 loss (adjusted) with mandrel Figure F.13 – L3 loss (adjusted) with mandrel and mode conditioning |
| 46 | Annex G (informative) OTDR configuration information |
| 48 | Table G.1 – Default effective group index of refraction values |
| 49 | Figure G.1 – Splice and macro bend attenuation measurement |
| 50 | Figure G.2 – Attenuation measurement with high reflection connectors |
| 51 | Figure G.3 – Attenuation measurement of a short length cabling |
| 52 | Figure G.4 – OTDR trace with ghost |
| 53 | Figure G.5 – Cursors positioning |
| 55 | Annex H (informative) Test cord insertion loss verification |
| 56 | Figure H.1 – Obtaining reference power level P0 |
| 57 | Figure H.2 – Obtaining power level P1 |
| 58 | Figure H.3 – Obtaining reference power level P0 Figure H.4 – Obtaining power level P1 |
| 59 | Figure H.5 – Obtaining reference power level P0 Figure H.6 – Obtaining power level |
| 60 | Figure H.7 – Obtaining reference power level P0 Figure H.8 – Obtaining power level P1 Figure H.9 – Obtaining power level P5 |
| 61 | Figure H.10 – Obtaining reference power level P0 Figure H.11 – Obtaining power level P1 |
| 63 | Bibliography |
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