IEC 61756-1:2019

Fibre optic interconnecting devices and passive components - Interface standard for fibre management systems - Part 1: General and guidance

IEC 61756-1:2019 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. This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- addition of figures to show the interface between protective housing and fibre management system;
- addition of definitions for protective housing, closure, wall box, street cabinets and optical distribution frame modules;
- addition of table with dimensions of fusion splice protectors and mechanical splices;
- addition of method to identify the minimum bending radius for stored fibres;
- addition of clause for other factors relevant to fibre management systems;
- addition of annex A for example of calculating the minimum bending radius of stored fibres in a fibre management system.
Keywords: fibre management system interfaces, minimum bending radius for stored fibres

Dispositifs d’interconnexion et composants passifs fibroniques – Norme d’interface pour les systèmes de gestion de fibres - Partie 1: Généralités et recommandations

IEC 61767-1:2019 englobe des informations générales sur les interfaces de système de gestion des fibres. Elle comprend les définitions et les règles régissant la création d'une interface de système de gestion des fibres et elle fournit des critères permettant d'identifier le rayon de courbure minimal des fibres stockées. Le présent document permet d'utiliser les fibres unimodales et les fibres multimodales. Les exigences relatives à l'étanchéité aux liquides, aux gaz ou à la poussière au niveau de la zone d'entrée de câble ou à l'extrémité des éléments de câble ne sont pas couvertes par le présent document. Cette deuxième édition annule et remplace la première édition parue en 2006 dont elle constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout de figures de représentation de l'interface entre une enveloppe de protection et le système de gestion des fibres;
- ajout des définitions d'enveloppe de protection, de boîtier, de boîte murale, d'armoire située dans un environnement urbain et de module répartiteur optique;
- ajout d'un tableau qui donne les dimensions des protecteurs d'épissures par fusion et des épissures mécaniques;
- ajout d'une méthode permettant d'identifier le rayon de courbure minimal des fibres stockées;
- ajout d'un article portant sur d'autres facteurs applicables aux systèmes de gestion des fibres;
- ajout de l'Annexe A qui donne un exemple de calcul du rayon de courbure minimal des fibres stockées dans un système de gestion des fibres.
Mots clés : interfaces de système de gestion des fibres, rayon de courbure minimal des fibres stockées

General Information

• Status: Published
• Publication Date: 26-Nov-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: PPUB - Publication issued
• Start Date: 08-Nov-2019
• Completion Date: 27-Nov-2019

Relations

• Revises: IEC 61756-1:2006 - Fibre optic interconnecting devices and passive components - Interface standard for fibre management systems - Part 1: General and guidance
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61756-1 ®
Edition 2.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Interface
standard for fibre management systems –
Part 1: General and guidance
Dispositifs d'interconnexion et composants passifs fibroniques – Norme
d'interface pour les systèmes de gestion de fibres –
Partie 1: Généralités et recommandations

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and once 67 000 electrotechnical terminology entries in English and
a month by email. French extracted from the Terms and Definitions clause of IEC
publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or need CISPR.

further assistance, please contact the Customer Service

Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Le premier dictionnaire d'électrotechnologie en ligne au monde,
webstore.iec.ch/advsearchform avec plus de 22 000 articles terminologiques en anglais et en
La recherche avancée permet de trouver des publications IEC français, ainsi que les termes équivalents dans 16 langues
en utilisant différents critères (numéro de référence, texte, additionnelles. Egalement appelé Vocabulaire
comité d’études,…). Elle donne aussi des informations sur les Electrotechnique International (IEV) en ligne.

projets et les publications remplacées ou retirées.
Glossaire IEC - std.iec.ch/glossary
IEC Just Published - webstore.iec.ch/justpublished 67 000 entrées terminologiques électrotechniques, en anglais
Restez informé sur les nouvelles publications IEC. Just et en français, extraites des articles Termes et Définitions des
Published détaille les nouvelles publications parues. publications IEC parues depuis 2002. Plus certaines entrées
Disponible en ligne et une fois par mois par email. antérieures extraites des publications des CE 37, 77, 86 et
CISPR de l'IEC.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
Electropedia - www.electropedia.org

IEC 61756-1 ®
Edition 2.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Interface

standard for fibre management systems –

Part 1: General and guidance
Dispositifs d'interconnexion et composants passifs fibroniques – Norme

d'interface pour les systèmes de gestion de fibres –

Partie 1: Généralités et recommandations

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-7511-5

– 2 – IEC 61756-1:2019 © IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 Fibre management related definitions . 6
3.2 Component related definitions . 9
3.3 Protective housing related definitions . 11
4 Abbreviated terms . 12
5 Description of a fibre management system . 13
6 Parts and functions of a fibre management system . 14
6.1 General . 14
6.2 Splice trays . 15
6.3 Minimum bending radius for stored fibres . 16
6.4 Splice protector . 19
6.5 Splice holder . 20
6.6 Guiding elements . 21
6.7 Patchcords and pigtails . 22
6.8 Identification of fibres, fibre tubes or single elements . 22
7 Other factors relevant to fibre management systems . 22
7.1 Re-entry and access . 22
7.2 Quality of mouldings . 22
7.3 Polymer materials . 22
7.4 Marked or colour coded parts . 22
Annex A (informative) Use of flow chart for calculation of the minimum bending radius
for stored fibres . 23
A.1 Example of calculation minimum bending radius . 23
A.2 Results for various fibre types with a 1 m storage length . 28
A.3 Results for various fibre types with 2 m storage length . 29
Bibliography . 31

Figure 1 – Multiple element management system . 7
Figure 2 – Single circuit management system. 8
Figure 3– Single element management system . 8
Figure 4– Patchcord . 11
Figure 5– Pigtail . 11
Figure 6 – Functional parts diagram of a protective housing. 13
Figure 7 – Functional parts diagram of FMS . 14
Figure 8 – Typical required failure probabilities of various networks . 17
Figure 9 – Lifetimes per bent fibre metre versus failure probability for various
bending radii . 18
Figure 10 – Flow chart for minimum bending radius of stored fibres . 19
Figure 11 – F type splice protector . 20
Figure 12– S type splice protector. 20
Figure 13 – M type fibre splice . 20

Figure A.1 – Step 1: Find radius that matches the failure probability target requirement. 23
Figure A.2 – Find bending radius for specified failure probability target and fibre length . 24
Figure A.3 – Step 2: Estimate the maximum attenuation increase for bending radius . 25
Figure A.4 – Estimated maximum attenuation increase for bending radius of 15 mm . 25
Figure A.5 – Step 3: Compare estimated maximum attenuation with requirement . 26
Figure A.6 – Estimated attenuation increase for bending radius of 20 mm . 27
Figure A.7 – Step 5: Check the estimated attenuation with requested maximum limit . 28
Figure A.8 – Estimated maximum attenuation increase for bending radius . 29

Table 1 – Optical fibre fusion splice protectors – Outline and nominal dimensions . 20
Table 2 – Mechanical fibre splices – Outline and nominal dimensions . 20
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 . 29
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 . 30

– 4 – IEC 61756-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
INTERFACE STANDARD FOR FIBRE MANAGEMENT SYSTEMS –

Part 1: General and guidance
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 in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendati
...