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
Current Stage
PPUB - Publication issued
Completion Date
27-Nov-2019
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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
IEC 61756-1:2019-11(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

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IEC 61756-1:2019 © IEC 2019 – 3 –

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

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– 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

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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 recommendations for international use and are accepted by IEC National

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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 possibility 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 61756-1 has been prepared by subcommittee 86B: Fibre optic

interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.

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:

a) addition of figures to show the interface between protective housing and fibre management

system;

b) addition of definitions for protective housing, closure, box, street cabinets and optical

distribution frame modules;

c) addition of table with dimensions of fusion splice protectors and mechanical splices;

d) addition of method to identify the minimum bending radius for stored fibres;
---------------------- Page: 6 ----------------------
IEC 61756-1:2019 © IEC 2019 – 5 –
e) addition of clause for other factors relevant to fibre management systems;

f) addition of annex A for example of calculating the minimum bending radius of stored fibres

in a fibre management system.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/4228/FDIS 86B/4240/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 7 ----------------------
– 6 – IEC 61756-1:2019 © IEC 2019
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
INTERFACE STANDARD FOR FIBRE MANAGEMENT SYSTEMS –
Part 1: General and guidance
1 Scope

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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60793-2-10, Optical fibres - Part 2-10: Product specifications - Sectional specification for

category A1 multimode fibres

IEC 60793-2-50, Optical fibres - Part 2-50: Product specifications - Sectional specification for

class B single-mode fibres
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Fibre management related definitions
3.1.1
distribution element

element for a fibre management system providing fibre branching, holding and distribution

function
3.1.2
fibre management system

system to control, protect and store splices, connectors, passive optical components and fibres

from incoming to outgoing cables
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IEC 61756-1:2019 © IEC 2019 – 7 –

Note 1 to entry: A fibre management system is intended for installation within a protective housing.

Note 2 to entry: A fibre management system is often called an "organiser".
3.1.3
multiple element
physical fibre separation level consisting of more than one single element

Note 1 to entry: This separation level has fibres from multiple cable elements on one splice tray and is also called

mass storage. It is the lowest (worst) degree of physical circuit separation.
3.1.4
multiple element management system

system which provides all necessary equipment to connect a defined number of incoming and

outgoing fibres/cables

Note 1 to entry: It comprises storage and protection of fibres/ribbons and interconnections in one tray for more than one

single element (see Figure 1).

Note 2 to entry: There are many different names for this structure, for example " mass storage". In this document,

" multiple element" will be used.
Figure 1 – Multiple element management system
3.1.5
multiple ribbon

multiple element consisting of multiple optical fibres (circuits) arranged in ribbons (fibres in

parallel) which are also arranged (for example, in stacks)
3.1.6
optical performance stability

stability of the system to transient loss introduced by external disturbances of the fibres

3.1.7
single circuit

physical fibre separation level where the optical circuit consists of one fibre (single fibre), or

more than one fibre, providing all services for one subscriber

Note 1 to entry: This fibre separation level has the fibre(s) of only one customer on one splice tray. It is the highest

(best) degree of physical circuit separation.
3.1.8
single circuit management system

system which provides all necessary equipment to connect a defined number of incoming and

outgoing fibres/cables
---------------------- Page: 9 ----------------------
– 8 – IEC 61756-1:2019 © IEC 2019

Note 1 to entry: It comprises storage and protection of fibres/ribbons and interconnections with one single circuit

per splice tray (Figure 2).

Note 2 to entry: Disturbance of operational circuits by accessing any other adjacent circuit should be minimised.

The disturbance should stay within allowable tolerances given in related performance standards.

Figure 2 – Single circuit management system
3.1.9
single element

physical fibre separation level in the cable subassembly comprising one or more optical fibres

inside a common covering for example in a tube or inside one groove of a grooved cable (slotted

core cable)
Note 1 to entry: A single element provides services to more than one subscriber.

Note 2 to entry: This fibre separation level has all fibres from a cable element (e.g. loose tube) on one splice tray.

It is an intermediate degree of physical circuit separation (between single circuit and multiple element).

3.1.10
single element management system

system which provides all necessary equipment to connect a defined number of incoming and

outgoing fibres/cables

Note 1 to entry: It comprises storage and protection of fibres/ribbons and interconnections in one tray for each

single element (see Figure 3).
Figure 3– Single element management system
3.1.11
single ribbon
single element designed to carry all fibres of one ribbon
---------------------- Page: 10 ----------------------
IEC 61756-1:2019 © IEC 2019 – 9 –

Note 1 to entry: Depending on the fibres deployment’, a single ribbon can contain all the fibres of one circuit (single

circuit) or the fibres of more than one circuit (single element).
3.1.12
splice tray

structure that organises and controls storage of fibre splices in an orderly manner, together with

the associated excess uncabled fibre length
Note 1 to entry: It can be a part of a fibre management system.
3.1.13
transient loss

short term (ms) reversible change of optical transmission characteristics arising from optical

discontinuity, physical defects and modifications of the attenuation (e.g. bending loss) normally

caused by mechanical stress
3.1.14
uncut fibre

fibres from a continuous cable with the cable sheath removed over a defined length without

cutting the fibres or tubes

Note 1 to entry: The uncut tubes or fibres are stored e.g. in a space saving loop. When required, the fibres are cut

and spliced or connected.
3.2 Component related definitions
3.2.1
active optical component
optical component exhibiting one or more of the following functions:
– generation or detection of optical power;

– conversion of an electronic signal to a corresponding optical one or vice versa;

– optical amplification or optical regeneration (2R or 3R) of an optical signal;
– direct conversion of the optical frequency of an optical signal
3.2.2
adapter
component in which two or more ferrules are aligned
Note 1 to entry: A ferrule is the fibre holding component part of the plug.
[SOURCE: IEC 60874-1:2011, 3.1, modified – The note has been added.]
3.2.3
fan-out

passive optical component providing a transition between a single ribbon or single element into

individual fibres
3.2.4
fusion splice

permanent joint accomplished by the application of localised heat sufficient to fuse or melt the

ends of two lengths of optical fibre, to produce a continuous single optical fibre

[SOURCE: IEC 60050-731:1991, 731-05-06, modified – The words "a splice" has been replaced

by "permanent joint".]
3.2.5
fusion splice protector

component which protects the weak fusion zone and the bare fibres of a fusion splice

---------------------- Page: 11 ----------------------
– 10 – IEC 61756-1:2019 © IEC 2019

Note 1 to entry: The most common types used in fibre management systems are heat shrinkable or mechanical

fusion splice protectors.
3.2.6
live fibre
transmitting fibre
fibre optical circuit that is carrying an optical signal
3.2.7
mechanical splice

fibre splice accomplished by fixtures or materials, rather than by thermal fusion

[SOURCE: IEC 60050-731:1991, 731-05-07]
3.2.8
non-transmitting fibre
optical circuit that is not carrying an optical signal
3.2.9
optical connector set

complete assembly of components required to provide demountable coupling between optical

fibres

[SOURCE: IEC 60874-1:2011, 3.15, modified – The word "fibre" has been deleted from the term,

and the definition has been rephrased.]
3.2.10
optical fibre connector

component normally attached to an optical cable or piece of apparatus for the purpose of

providing optical interconnection and disconnection of optical fibres or cables

Note 1 to entry: The interconnection usually consists of two plugs mated together in an adapter or 1 plug mated in

a socket.

[SOURCE: IEC 60050-731:1991, 731-05-01, modified – The definition has been rephrased, and

the note added.]
3.2.11
optical fibre splice

permanent or separable joint whose purpose is to couple optical power between two optical

fibres, realised by either a fusion or a mechanical technique

[SOURCE: IEC 60050-731, 731-05-05, modified – The words "or separable" and "realised by

either a fusion or a mechanical technique" have been added.]
3.2.12
passive optical component

optical component or assembly which does not require any source of energy for its operation

other than optical input signals

Note 1 to entry: A passive optical component might need external power to control the stability of its optical

characteristics. Example is controlling the temperature of the component.

Note 2 to entry: A passive optical component never generates an optical gain of signal power.

[SOURCE: IEC TS 62538 modified]
3.2.13
patchcord

length of optical fibre or cable, permanently terminated at both ends with a plug

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IEC 61756-1:2019 © IEC 2019 – 11 –
Note 1 to entry: See Figure 4.
Figure 4– Patchcord

[SOURCE: IEC 60874-1:2011, 3.17, modified –The words "optical fibre" and "or jumper" have

been deleted from the term. The note and figure have been added.]
3.2.14
pigtail
length of optical fibre or cable, permanently terminated at one end with a plug
Note 1 to entry: See Figure 5.
Figure 5– Pigtail

[SOURCE: IEC 60874-1:2011, 3.18, modified –The words "optical fibre" have been deleted from

the term. The note and figure have been added.]
3.2.15
plug
male-type part of an optical fibre connector

Note 1 to entry: Optical fibre connectors are either two plugs mated in an adapter or one plug mated into a socket

(female part).

[SOURCE: IEC 60874-1:2011, 3.20, modified – The words "fibre optic" have been added to the

definition, and the note has been added.]
3.3 Protective housing related definitions
3.3.1
box

free breathing protective housing that is permanently attached to a vertical wall or pole

Note 1 to entry: A box is not specifically designed to allow cable movement (e.g. torsion, bending) at the cable ports

during operation.
3.3.2
free breathing cl
...

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