This part of IEC 61756 covers general information on fibre management system interfaces. It includes the definitions and rules under which a fibre management system interface is created and it provides also criteria to identify the minimum bending radius for stored fibres.<\/p>\n
This document allows both single-mode and multimode fibre to be used.<\/p>\n
Liquid, gas or dust sealing requirements at the cable entry area or cable element ending are not covered in this document.<\/p>\n
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|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figures Figure 1 \u2013 Multiple element management system <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figure 2 \u2013 Single circuit management system Figure 3\u2013 Single element management system <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Figure 4\u2013 Patchcord Figure 5\u2013 Pigtail <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4 Abbreviated terms <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5 Description of a fibre management system Figure 6 \u2013 Functional parts diagram of a protective housing <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6 Parts and functions of a fibre management system 6.1 General Figure 7 \u2013 Functional parts diagram of FMS <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.2 Splice trays <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6.3 Minimum bending radius for stored fibres <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure 8 \u2013 Typical required failure probabilities of various networks <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure 9 \u2013 Lifetimes per bent fibre metre versus failure probability for various bending radii <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.4 Splice protector Figure 10 \u2013 Flow chart for minimum bending radius of stored fibres <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 6.5 Splice holder Figure 11 \u2013 F type splice protector Figure 12\u2013 S type splice protector Figure 13 \u2013 M type fibre splice Tables Table 1 \u2013 Optical fibre fusion splice protectors \u2013 Outline and nominal dimensions Table 2 \u2013 Mechanical fibre splices \u2013 Outline and nominal dimensions <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 6.6 Guiding elements <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 6.7 Patchcords and pigtails 6.8 Identification of fibres, fibre tubes or single elements 7 Other factors relevant to fibre management systems 7.1 Re-entry and access 7.2 Quality of mouldings 7.3 Polymer materials 7.4 Marked or colour coded parts <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Annex A (informative) Use of flow chart for calculation of the minimum bending radius for stored fibres A.1 Example of calculation minimum bending radius Figure A.1 \u2013 Step 1: Find radius that matches the failure probability target requirement <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure A.2 \u2013 Find bending radius for specified failure probability target and fibre length <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure A.3 \u2013 Step 2: Estimate the maximum attenuation increase for bending radius Figure A.4 \u2013 Estimated maximum attenuation increase for bending radius of 15 mm <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure A.5 \u2013 Step 3: Compare estimated maximum attenuation with requirement <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure A.6 \u2013 Estimated attenuation increase for bending radius of 20 mm <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | A.2 Results for various fibre types with a 1 m storage length Figure A.7 \u2013 Step 5: Check the estimated attenuation with requested maximum limit <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | A.3 Results for various fibre types with 2 m storage length Figure A.8 \u2013 Estimated maximum attenuation increase for bending radius Table A.1 \u2013 Minimum bending radius for storage of the various fibre types with typical mechanical failure probability targets for different network locations and fibre storage length of 1 metre and maximum attenuation increase of 0,05 dB at 1 625 nm <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Table A.2 \u2013 Minimum storage radius for the various fibre types with typical mechanical failure probability targets for different network locations and fibre storage length of 2 metres and maximum allowed attenuation increase of 0,1 dB at 1 550 nm <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Fibre optic interconnecting devices and passive components. Interface standard for fibre management systems – General and guidance<\/b><\/p>\n |