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

IEC 61758-1:2008 provides general information and guidance on the subject of closures. It includes references, general closure and interface descriptions and definitions. Key words: interface standard for closures

Dispositifs d'interconnexion et composants passifs à fibres optiques - Norme d'interface pour boîtiers - Partie 1: Généralités et lignes directrices

La CEI 61758-1:2008 fournit des informations générales et des lignes directrices sur le thème des boîtiers. Elle comprend des références, des descriptions et des définitions générales d'interface et de boîtiers. Mots clés: norme d'interface pour boîtiers

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IEC 61758-1
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Interface
standard for closures –
Part 1: General and guidance
Dispositifs d'interconnexion et composants passifs à fibres optiques – Norme
d’interface pour boitiers –
Partie 1: Généralités et lignes directrices
IEC 61758-1:2008
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61758-1
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Interface
standard for closures –
Part 1: General and guidance
Dispositifs d'interconnexion et composants passifs à fibres optiques – Norme
d’interface pour boitiers –
Partie 1: Généralités et lignes directrices
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 33.180.20 ISBN 978-2-83220-355-2

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 – 61758-1 © IEC:2008
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope ............................................................................................................................... 6

2 Normative references ....................................................................................................... 7

3 Terms, definitions and abbreviations ................................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviations .......................................................................................................... 9

4 General description .......................................................................................................... 9

4.1 Functional requirements .......................................................................................... 9

4.2 Environmental requirements .................................................................................... 9

4.3 Functional closure parts ........................................................................................ 10

4.3.1 Primary function ........................................................................................ 10

4.3.2 Cover functional requirements ................................................................... 10

4.3.3 Base or end plate functional requirements ................................................. 10

4.3.4 Opening and closing functional requirements ............................................. 10

4.3.5 Closure seal functional requirements ......................................................... 10

4.3.6 General functional requirements ................................................................ 11

5 Closure overpressure safety ........................................................................................... 11

6 Grounding interface ........................................................................................................ 11

7 General closure interfaces .............................................................................................. 11

8 Cable to closure interface ............................................................................................... 11

8.1 General ................................................................................................................. 11

8.2 Functional requirements ........................................................................................ 11

8.2.1 General ..................................................................................................... 11

8.2.2 Cable entry port ......................................................................................... 12

8.2.3 Repair, maintenance and testing ............................................................... 12

8.2.4 Moisture and gas ingress, sealing and blocking ......................................... 12

8.2.5 Mechanical impacts ................................................................................... 13

8.2.6 Cable and closure handling ....................................................................... 13

8.2.7 Electrical continuity and lightning protection .............................................. 13

8.2.8 Fire-related performance ........................................................................... 13

8.2.9 Identification of cables and sub-parts ........................................................ 13

8.2.10 Biotic protection......................................................................................... 13

8.2.11 Cable anchoring and supporting elements to closure ................................. 14

8.2.12 UV resistance ............................................................................................ 14

8.2.13 Resistance to aggressive media ................................................................ 14

9 Closure to FMS interface ................................................................................................ 14

9.1 General ................................................................................................................. 14

9.2 Functional requirements ........................................................................................ 14

9.2.1 Mounting of the FMS to the closure ........................................................... 14

9.2.2 Identification .............................................................................................. 14

9.2.3 Access to FMS .......................................................................................... 15

9.2.4 Bending radius .......................................................................................... 15

9.2.5 Mechanical impacts ................................................................................... 15

9.2.6 FMS grounding .......................................................................................... 15

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61758-1 © IEC:2008 – 3 –

9.2.7 Fire hazard (optional for indoor applications) ............................................. 15

9.2.8 Laser safety............................................................................................... 15

9.2.9 High optical power damage ....................................................................... 15

10 Other parts of the closure interface ................................................................................ 16

10.1 General ................................................................................................................. 16

10.2 Passive components that may be included in a closure ......................................... 16

10.2.1 xWDM ....................................................................................................... 16

10.2.2 Moisture sensors ....................................................................................... 16

10.2.3 Security features ....................................................................................... 16

10.2.4 Connectors and adaptors ........................................................................... 16

10.2.5 Pressure relief valves ................................................................................ 16

10.2.6 Splitters/couplers ....................................................................................... 16

10.2.7 Optical switches ........................................................................................ 17

10.2.8 Desiccant .................................................................................................. 17

10.3 Active components that may be included in a closure ............................................ 17

10.3.1 Moisture sensors ....................................................................................... 17

10.3.2 Security alarms.......................................................................................... 17

10.3.3 Optical switches ........................................................................................ 17

10.3.4 Converters ................................................................................................. 17

11 Closure interface to external siting ................................................................................. 17

11.1 Functional requirements ........................................................................................ 17

11.2 Mounting of the closure to the external siting......................................................... 17

11.3 Cable entry orientation .......................................................................................... 17

11.4 Identification.......................................................................................................... 17

11.5 Access to closure and cable .................................................................................. 17

11.6 Earthquake resistance ........................................................................................... 18

11.7 Closure grounding ................................................................................................. 18

11.8 Lightning protection ............................................................................................... 18

11.9 Fire hazard (optional for indoor applications) ......................................................... 18

11.10 External siting of closure in aerial applications ...................................................... 18

Bibliography .......................................................................................................................... 19

Figure 1 – Closure and FMS functions .................................................................................... 7

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– 4 – 61758-1 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
INTERFACE STANDARD FOR CLOSURES –
Part 1: General and guidance
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organisation 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 organisations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organisation for Standardization (ISO) in accordance with conditions determined by

agreement between the two organisations.

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

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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 61758-1 has been prepared by subcommittee 86B: Fibre optic

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

This bilingual version (2012-09) corresponds to the monolingual English version, published in

2008-04.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2683/FDIS 86B/2712/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
The French version of this standard has not been voted upon.
---------------------- Page: 6 ----------------------
61758-1 © IEC:2008 – 5 –

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

A list of all parts of the IEC 61758 series, published under the general title Fibre optic

interconnecting devices and passive components – Interface standard for closures, can be

found on the IEC website.

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

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the

data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – 61758-1 © IEC:2008
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
INTERFACE STANDARD FOR CLOSURES –
Part 1: General and guidance
1 Scope

This part of IEC 61758 provides general information and guidance on the subject of closures.

It includes references, general closure and interface descriptions and definitions.

This standard defines the following general interfaces for closures:
• interface to cables;
• interface to FMS;
• interface to parts other than FMS or cables;
• interface to external sitings (pits, manholes etc.)

This specification covers all types of closures. The performance requirements are given in

IEC 61753-111 series (in preparation).

This closure standard allows both single mode and multi-mode fibre to be used, and covers all

IEC standard optical fibre cables as listed in Clause 2, with their various fibre capacities,

types and designs.

Figure 1 shows and defines the interface between the closure and the fibre management

system.
---------------------- Page: 8 ----------------------
61758-1 © IEC:2008 – 7 –
Closure* Fibre management system**
c e
h k n
IEC 532/08
Key
Closure functions*
FMS functions**
(a) Cable sealing
(g) Organiser/splice tray(s)
(b) Cable anchorage
(h) Fibre storage
(c) Cable blockage
(j) Distribution element
(d) Cable gas blocking
(k) Passive components
(e) Distribution element
(m) Guiding elements
(f) Identification
(n) Connectors
(p) Cable element storage
* * Example of FMS
* Example of Closure
Figure 1 – Closure and FMS functions
2 Normative references

The following referenced documents are indispensable for the application 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 60068-3-3, Environmental testing – Part 3: Guidance – Seismic test methods for

equipment

IEC 60721-2-6, Classification of environmental conditions – Part 2: Environmental conditions

appearing in nature – Earthquake vibration and shock
IEC 60793-2 (all parts), Optical fibres – Part 2: Product specifications
IEC 60794-2 (all parts), Optical fibre cables – Part 2: Indoor cables
IEC 60794-3 (all parts), Optical fibre cables – Part 3: Outdoor cables

IEC 60825-2, Safety of laser products – Part 2: Safety of optical fibre communication

systems (OFCS)

IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic

test and measurement procedures
---------------------- Page: 9 ----------------------
– 8 – 61758-1 © IEC:2008

IEC 61753 (all parts), Fibre optic interconnecting devices and passive components

performance standard

IEC 61753-1, Fibre optic interconnecting devices and passive components performance

standard – Part 1 – General and guidance for performance standards

IEC 61756-1, Fibre optic interconnecting devices and passive components – Interface

standard for fibre management systems – Part 1: General and guidance
IEC/TR 62222, Fire performance of communication cables installed in buildings
3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.1.1
ancillary components
components that are used for functions other than optical transmission
3.1.2
closure
all external housings except outdoor cabinets
3.1.3
enclosure
indoor housings (cabinets, cases, distribution frames) and outdoor cabinets
3.1.4
housing
closure or enclosure
3.1.5
intervention

opening the cover, modifying, adding, removing or repairing fibre circuits, splices, connectors

or other components between the incoming and outgoing cables of an existing fibre

management system
3.1.6
optical node

a point of intervention in the network, e.g. at each opening of a cable jacket or at the end of

the cable

NOTE Nodes in this specification are parts of the physical network containing closures and fibre management

systems capable of performing their expected function in the network, while exposed to the environment that they

are intended to reside in.
3.1.7
fibre management system

system to control, protect and store fibres from the incoming to the outgoing fibres

[IEC 61756-1, definition 3.1.4]
3.1.8
active optical component

optical component or assembly which makes use of quantum-mechanical effects or generates

optical gain of signal power, or directly modulates optical signals
NOTE 1 Examples include optical amplifiers.
---------------------- Page: 10 ----------------------
61758-1 © IEC:2008 – 9 –

NOTE 2 Sometimes optical sources and optical detectors have been designed as active optical components.

[IEC 61756-1, definition 3.1.14].
3.1.9
passive optical component

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

operation other than optical input signals, or controls the dynamic or static characteristics of

optical signals using a source of energy; an optical passive component never generates an

optical gain of signal power
NOTE 1 Examples include optical attenuators and passive branching devices.

NOTE 2 Photo diode, which is an active component used as simple signal monitoring, might be treated as a

passive optical component.
[IEC 61756-1, definition 3.1.15]
3.1.10
external siting
mounting location for closures
3.2 Abbreviations
FMS: fibre management system
xWDM: wavelength division multiplexing device (DWDM, CWDM, etc.)
4 General description
4.1 Functional requirements
The general function of the closure is to provide:

• a housing for a fibre management system, including cable element storage, and ancillary

passive or active components or other functional parts to build an optical node;

• a management system for the external environment, e.g. subterranean chambers, aerial

poles and street cabinets;
• environmental and mechanical protection.

The following ancillary passive and active optical components may be stored or installed in

the closure, but outside of the fibre management system or other functional parts of the

optical node:

• electronic sensors and ancillary equipment for the detection of moisture ingress;

• communication electronic alarm devices and cable equipment for the transmission of

signals to an external remote control station;

• grounding to earth of metallic parts of the structure and cables for operator safety.

4.2 Environmental requirements
The primary environmental requirements are:
• environmental protection;
• mechanical protection.

Environmental and mechanical protection prevents damage to the closure and protect internal

closure components and assemblies from external environmental influences, including

---------------------- Page: 11 ----------------------
– 10 – 61758-1 © IEC:2008

temperature, humidity, vibration, impact, compression, torsion, bump, tension and aggressive

and corrosive media.

Environmental performance tests are carried out to suit the installed environment. Each has

an appropriate severity category listed in IEC 61300 and IEC 61753-1:
• S: subterranean (underground);
• A: aerial;
• G: ground level;
• C: controlled (in building).
4.3 Functional closure parts
4.3.1 Primary function

The primary function of the closure is to protect the fibre and other functional parts and to

provide quick access to all internal components and assemblies.
The primary functional parts of the closure are:
• covers;
• base or end plates;
• closing parts;
• seals for the base or end plates.
4.3.2 Cover functional requirements
The closure cover requires the following features:
• sealing feature;
• means of attachment .
4.3.3 Base or end plate functional requirements
The primary function of the base or end plate is cable attachment and sealing.
The closure base or end plate requires the following features:
• sealing feature;
• means of attachment;
• cable entry ports.
4.3.4 Opening and closing functional requirements

The opening and closing function provides access to internal members, adequate closing

force and structural strength.
The closure cover to base fixing requires the following features:
• secure fixing;
• sealing feature.
4.3.5 Closure seal functional requirements

The function of these parts of the closure is to form a gas and liquid resistant seal.

---------------------- Page: 12 ----------------------
61758-1 © IEC:2008 – 11 –
4.3.6 General functional requirements

In addition to the above the following functions shall be provided, where required, in each

closure:
• ability to attach other structural parts;
• ability to fit an air pressure valve.
5 Closure overpressure safety

Overpressure can build up in sealed closures due to temperature differentials over a period of

time, or due to tightness testing of the seals after installation or incorrect installation

techniques.
Care should be taken when opening a sealed closure.

Provisions shall be made that overpressure is exhausted when opening the closure prior to

complete removal of the cover.

For all sealed closures used for air blown fibre cable applications, a preset overpressure

release system is required.
6 Grounding interface

When required by local regulations, metallic parts of the closure shall have a provision for

electrical grounding, primarily for safety. Additional parts can be used to provide an external

grounding.
7 General closure interfaces
This standard defines interfaces of:
• cable to closure interface;
• FMS to closure interface;
• other parts to closure interface;
• closure to external interface.
8 Cable to closure interface
8.1 General

Functional requirements of the cable to closure interface shall maintain the mechanical,

electrical and environmental characteristics of the cable when cable sheath is removed.

These interface specifications consider fibre types according to the IEC 60793-2 series and

cable types in compliance with the IEC 60794-2 and IEC 60794-3 series.
8.2 Functional requirements
8.2.1 General

The interface requirements depend on the cable construction and environmental category.

The main function of the closure is to ensure the gas and water tightness of the fibre

connections of two or more conne
...

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