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BS EN IEC 61756-1:2020

BS EN IEC 61756-1:2020

$167.15

Fibre optic interconnecting devices and passive components. Interface standard for fibre management systems – General and guidance

Published By Publication Date Number of Pages
BSI 2020 38
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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.

This document allows both single-mode and multimode fibre to be used.

Liquid, gas or dust sealing requirements at the cable entry area or cable element ending are not covered in this document.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
8 English
CONTENTS
10 FOREWORD
12 1 Scope
2 Normative references
3 Terms and definitions
13 Figures
Figure 1 – Multiple element management system
14 Figure 2 – Single circuit management system
Figure 3– Single element management system
17 Figure 4– Patchcord
Figure 5– Pigtail
18 4 Abbreviated terms
19 5 Description of a fibre management system
Figure 6 – Functional parts diagram of a protective housing
20 6 Parts and functions of a fibre management system
6.1 General
Figure 7 – Functional parts diagram of FMS
21 6.2 Splice trays
22 6.3 Minimum bending radius for stored fibres
23 Figure 8 – Typical required failure probabilities of various networks
24 Figure 9 – Lifetimes per bent fibre metre versus failure probability for various bending radii
25 6.4 Splice protector
Figure 10 – Flow chart for minimum bending radius of stored fibres
26 6.5 Splice holder
Figure 11 – F type splice protector
Figure 12– S type splice protector
Figure 13 – M type fibre splice
Tables
Table 1 – Optical fibre fusion splice protectors – Outline and nominal dimensions
Table 2 – Mechanical fibre splices – Outline and nominal dimensions
27 6.6 Guiding elements
28 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
29 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 – Step 1: Find radius that matches the failure probability target requirement
30 Figure A.2 – Find bending radius for specified failure probability target and fibre length
31 Figure A.3 – Step 2: Estimate the maximum attenuation increase for bending radius
Figure A.4 – Estimated maximum attenuation increase for bending radius of 15 mm
32 Figure A.5 – Step 3: Compare estimated maximum attenuation with requirement
33 Figure A.6 – Estimated attenuation increase for bending radius of 20 mm
34 A.2 Results for various fibre types with a 1 m storage length
Figure A.7 – Step 5: Check the estimated attenuation with requested maximum limit
35 A.3 Results for various fibre types with 2 m storage length
Figure A.8 – Estimated maximum attenuation increase for bending radius
Table A.1 – 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
36 Table A.2 – 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
37 Bibliography

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BS EN IEC 61756-1:2020
$167.15