IEC 60794-2-21:2019
(Main)Optical fibre cables - Part 2-21: Indoor cables - Detailed specification for multi-fibre optical distribution cables for use in premises cabling
Optical fibre cables - Part 2-21: Indoor cables - Detailed specification for multi-fibre optical distribution cables for use in premises cabling
IEC 60794-2-21:2019 presents the detailed requirements specific to this type of cable to ensure compatibility with the series of International Standards ISO/IEC 11801, Information technology – Generic cabling for customer premises (Parts 1 to 6). The requirements of family specification IEC 60794-2-20 are applicable to cables covered by this document. Particular requirements detailed in Clause 4 define either a specific option in relation to the requirements of IEC 60794-2-20 or additional requirements. This third edition cancels and replaces the second edition published in 2012. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) incorporation of the OM5 cabled fibre performance category;
b) incorporation of the OS1a cabled fibre performance category;
c) cabled fibre performance categories OM1, OM2 and OS1 are no longer normative, and are retained for information.
Keywords: multi-fibre distribution cables
Câbles à fibres optiques - Partie 2-21: Câbles intérieurs - Spécification particulière pour les câbles optiques multifibres de distribution utilisés dans le câblage de locaux
L'IEC 60794-2-21:2019 fournit les exigences particulières spécifiques à ce type de câble dont l’objet est d’assurer la compatibilité avec la série de Normes internationales ISO/IEC 11801, Technologies de l’information – Câblage générique des locaux d’utilisateurs (Parties 1 à 6). Les exigences contenues dans la spécification de famille IEC 60794-2-20 sont applicables aux câbles couverts par le présent document. Les exigences particulières contenues dans l'Article 4 définissent soit des options spécifiques relatives aux exigences de l’IEC 60794-2-20, soit des exigences complémentaires. La présente troisième édition annule et remplace la deuxième édition parue en 2012. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) l’intégration de la catégorie de performance de fibres câblées OM5;
b) l’intégration de la catégorie de performance de fibres câblées OS1a;
c) Les catégories de performance de fibres câblées OM1, OM2 et OS1 ne sont plus normatives, et sont conservées pour information.
Mots-clés: câbles optiques multifibres de distribution
General Information
Relations
Standards Content (Sample)
IEC 60794-2-21 ®
Edition 3.0 2019-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 2-21: Indoor optical fibre cables – Detailed specification for multi-fibre
optical distribution cables for use in premises cabling
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
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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.
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IEC 60794-2-21 ®
Edition 3.0 2019-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 2-21: Indoor optical fibre cables – Detailed specification for multi-fibre
optical distribution cables for use in premises cabling
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-6840-7
– 2 – IEC 60794-2-21:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 6
5 Particular requirements . 7
5.1 Fibre selection for cable testing . 7
5.2 Environmental requirements – Temperature cycling . 7
5.3 Transmission requirements . 7
5.3.1 Attenuation of cabled fibre . 7
5.3.2 Fibre bandwidth requirements . 8
Bibliography . 9
Table 1 – Multimode cable maximum attenuation coefficient (dB/km) . 7
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km) . 7
Table 3 – Minimum multimode fibre bandwidth (MHz·km) . 8
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-21: Indoor optical fibre cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 60794-2-21:2019 RLV © IEC 2019
International Standard IEC 60794-2-21 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2012. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) incorporation of the OM5 cabled fibre performance category;
b) incorporation of the OS1a cabled fibre performance category;
c) cabled fibre performance categories OM1, OM2 and OS1 are no longer normative, and are
retained for information.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1925/FDIS 86A/1935RVD
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.
A list of all the parts in the IEC 60794 series, published under the general title Optical fibre
cables, can be found on the IEC website.
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 publication using a colour printer.
OPTICAL FIBRE CABLES –
Part 2-21: Indoor optical fibre cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
1 Scope
This part of IEC 60794 presents the detailed requirements specific to this type of cable to
ensure compatibility with the series of International Standards ISO/IEC 11801, Information
technology – Generic cabling for customer premises (Parts 1 to 6).
The requirements of family specification IEC 60794-2-20:2008 are applicable to cables
covered by this document.
Particular requirements detailed in Clause 4 define either a specific option in relation to the
requirements of IEC 60794-2-20:2008 or additional requirements.
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.
They complete the normative references already listed in the generic specification
(IEC 60794-1-1:2011 and IEC 60794-1-2:2003,) and in the sectional specification
(IEC 60794-2:2002, Clause 2) or in the family specification (IEC 60794-2-20:2011, Clause 2).
IEC 60793-2-10:2007 —, Optical fibres – Part 2-10: Product specifications – Sectional
specification for category A1 multimode fibres
IEC 60793-2-50:2008 2018, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
IEC 60794-1-1:2011 2015, Optical Fibre cables – Part 1-1: Generic specification – General
IEC 60794-1-2:2003, Optical fibre cables – Part 1-2: Generic specification – Basic optical
cable test procedures
IEC 60794-2:2002, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 60794-2-20:2008 2013, Optical fibre cables − Part 2-20: Indoor cables − Family
specification for multi-fibre optical distribution cables
_________
Edition 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
– 6 – IEC 60794-2-21:2019 RLV © IEC 2019
3 Terms and definitions
No terms and definitions are listed in this document.
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
4 General requirements
The cable shall comply with the family specification IEC 60794-2-20:2008 and meet the
requirements that are defined in it.
The optical fibre contained in the cables which are covered by this document shall comply
with one of the following International Standards and meet the normative requirements
defined within them as applicable:
• IEC 60793-2-50:2008, Annex A [Single-mode B1.1 fibre]
• IEC 60793-2-50:2008, Annex C [Single-mode B1.3 fibre]
• IEC 60793-2-50:2008, Annex G [Single-mode B6_a1 and B6_a2 fibre]
• IEC 60793-2-10:2007, Annex A [Multimode A1a.1, 50 µm core fibre]
• IEC 60793-2-10:2007, Annex A [Multimode A1a.2, 50 µm core fibre]
• IEC 60793-2-10:2007, Annex A [Multimode A1a.3, 50 µm core fibre]
• IEC 60793-2-10:2007, Annex B [Multimode A1b, 62.5 µm core fibre]
• IEC 60793-2-50:2018, Annex A (single-mode B-652.D fibre);
• IEC 60793-2-50:2018, Annex F (single-mode B-657 fibres);
• IEC 60793-2-10:— , Annex A (multimode A1-OM3 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM4 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM5 fibre).
To ensure compatibility with ISO/IEC 11801 (all parts), optical performance level requirements
are presented in terms of the performance classification codes for cabled optical fibre as
follows:
• OS1 Single-mode fibre, B1.1, B1.3 category or sub-category B6_a1 and B6_a2;
• OS2 Single-mode fibre, B1.3 or sub-category B6_a1 and B6_a2;
• OM1 Multimode fibre, Model A1a.1 or sub-category A1b;
• OM2 Multimode fibre, Model A1a.1 or sub-category A1b;
• OM3 Multimode fibre, Model A1a.2;
• OM4 Multimode fibre, Model A1a.3;
• OS1a Single-mode fibre, categories B-652.D or B-657;
• OS2 Single-mode fibre, categories B-652.D or B-657;
• OM3 Multimode fibre, A1-OM3 category;
• OM4 Multimode fibre, A1-OM4 category;
_________
Editioni 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
• OM5 Multimode fibre, A1-OM5 category.
NOTE These codes are informative from the perspective of the requirements defined in this document. The OS1,
OM1 and OM2 performance classification codes for cabled optical fibre are no longer normative in
ISO/IEC 11801 (all parts). See ISO/IEC 11801-1:2017, Annex F, for more information.
5 Particular requirements
5.1 Fibre selection for cable testing
The fibre selection for cable testing shall be performed according to IEC 60794-1-1:2011
2015, Annex B.
5.2 Environmental requirements – Temperature cycling
The cable shall meet the requirement of IEC 60794-2-20:2008, clause 4.3 Table 2, option c
(–20 °C to +60 °C).
The cable shall be tested as per IEC 60794-2-20:2013, 4.4, and shall meet one of the
following temperature ranges as per the MICE classification system:
• C : −10 °C to +60 °C;
• C : −25 °C to +70 °C:
• C : −40 °C to +70 °C.
The test shall be performed on a 50 m specimen.
No attenuation changes (according to the IEC 60794-1-1 annex B3) shall be allowed during
the test.
The maximum increase in attenuation shall be agreed between customer and supplier.
5.3 Transmission requirements
5.3.1 Attenuation of cabled fibre
Depending on the fibre category, the attenuation coefficient of the cabled fibre shall be less
than the maximum values in Table 1 for the multimode fibres and less than the maximum
values in Table 2 for single-mode fibres – for the wavelengths listed in Table 2.
The fibre category shall be agreed between customer and supplier.
Table 1 – Multimode cable maximum attenuation coefficient (dB/km)
Fibre Attenuation Attenuation Performance codes
coefficient at 850 coefficient at
nm 1300 nm
IEC 60793-2-10:2007, A1a.1 3,5 1,5 OM1 OM2
IEC 60793-2-10:2007, A1a.2 3,5 1,5 OM1 OM2 OM3
IEC 60793-2-10:2007, A1a.3 3,5 1,5 OM1 OM2 OM3 OM4
IEC 60793-2-10:2007, A1b 3,5 1,5 OM1 OM2
IEC 60793-2-10, A1-OM3 3,0 1,5 OM3
IEC 60793-2-10, A1-OM4 3,0 1,5 OM4
IEC 60793-2-10, A1-OM5 3,0 1,5 OM5
– 8 – IEC 60794-2-21:2019 RLV © IEC 2019
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km)
Fibre 0 Wavelengths Maximum Performance codes
attenuation
nm
coefficient
IEC 60793-2-50:2008, B1.1, B1.3, 1 310, 1 383, 1 550 1,0 OS1a
B6_a1, B6_a2 , B-652.D and B-657
IEC 60793-2-50:2008, B1.1, B1.3, 1 310, 1 383, 1 550 0,4 OS2
B6_a1, B6_a2, B-652.D and B-657
5.3.2 Fibre bandwidth requirements
There are no bandwidth requirements for single-mode fibre.
For cables containing multimode fibres, the uncabled fibre shall be specified at one of
performance levels defined in Table 3 in terms of minimum bandwidth (MHz·km), wavelength,
and type of measurement.
The fibre category and performance level shall be agreed between customer and supplier.
Table 3 – Minimum multimode fibre bandwidth (MHz·km)
Fibre Nominal Overfilled Overfilled Effective Performance
core bandwidth at bandwidth at modal codes
diameter 850 nm 1300 nm bandwidth at
850 nm*
(µm)
IEC 60793-2-10:2007, 50 200 500 na OM1
A1a.1
IEC 60793-2-10:2007, 50 500 500 na OM2
A1a.1
IEC 60793-2-10:2007, 50 1 500 500 2 000 OM3
A1a.2
IEC 60793-2-10:2007, 50 3 500 500 4 700 OM4
A1a.3
IEC 60793-2-10:2007, A1b 62,5 200 500 na OM1
IEC 60793-2-10:2007, A1b 62,5 500 500 na OM2
Fibre Nominal Overfilled Overfilled Overfilled Effective Effective Performance
core launch launch launch modal modal codes
diameter bandwidth bandwidth bandwidth bandwidth bandwidth
at 850 nm at 953 nm at at 850 nm at 953 nm
µm
1 300 nm
IEC 60793 50 1 500 n/a 500 2 000 n/a OM3
-2-10, A1-
OM3
IEC 60793 50 3 500 n/a 500 4 700 n/a OM4
-2-10, A1-
OM4
IEC 60793 50 3 500 1 850 500 4 700 2 470 OM5
-2-10, A1-
OM5
Bibliography
IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable
test procedures – Mechanical test methods
IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable
test procedures – Environmental test methods
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods
IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 60794-2-10:2011, Optical fibre cables – Part 2-10: Indoor optical fibre cables – Family
specification for simplex and duplex cables
ISO/IEC 11801-1:2017, Information technology – Generic cabling for customer premises –
Part 1: General requirements
ISO/IEC 11801-2, Information technology – Generic cabling for customer premises – Part 2:
Office premises
ISO/IEC 11801-3, Information technology – Generic cabling for customer premises – Part 3:
Industrial premises
ISO/IEC 11801-4, Information technology – Generic cabling for customer premises – Part 4:
Single-tenant homes
ISO/IEC 11801-5, Information technology – Generic cabling for customer premises – Part 5:
Data centres
ISO/IEC 11801-6, Information technology – Generic cabling for customer premises – Part 6:
Distributed building services
___________
IEC 60794-2-21 ®
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
– 2 – IEC 60794-2-21:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 6
5 Particular requirements . 6
5.1 Fibre selection for cable testing . 6
5.2 Environmental requirements – Temperature cycling . 6
5.3 Transmission requirements . 7
5.3.1 Attenuation of cabled fibre . 7
5.3.2 Fibre bandwidth requirements . 7
Bibliography . 8
Table 1 – Multimode cable maximum attenuation coefficient (dB/km) . 7
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km) . 7
Table 3 – Minimum multimode fibre bandwidth (MHz·km) . 7
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 Nationa
...
IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
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.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and definitions clause of
IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-9098-9
IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
– 2 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION to Amendment . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 Particular requirements . 7
5.1 Fibre selection for cable testing . 7
5.2 Environmental requirements – Temperature cycling . 7
5.3 Transmission requirements . 8
5.3.1 Attenuation of cabled fibre . 8
5.3.2 Fibre bandwidth requirements . 8
Bibliography . 9
Table 1 – Multimode cable maximum attenuation coefficient (dB/km) . 8
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km) . 8
Table 3 – Minimum multimode fibre bandwidth (MHz·km) . 8
© IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60794-2-21 edition 3.1 contains the third edition (2019-04) [documents
86A/1925/FDIS and 86A/1935RVD] and its amendment 1 (2020-11) [documents
86A/2012/CDV and 86A/2055/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
– 4 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
International Standard IEC 60794-2-21 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) incorporation of the OM5 cabled fibre performance category;
b) incorporation of the OS1a cabled fibre performance category;
c) cabled fibre performance categories OM1, OM2 and OS1 are no longer normative, and are
retained for information.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60794 series, published under the general title Optical fibre
cables, can be found on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability 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.
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.
© IEC 2020
INTRODUCTION to Amendment
This amendment adds an important update considered during the development of the base
publication, IEC 60794-2-21:2019.
As regards minimum multimode fibre bandwidth requirements (Table 3), this amendment
provides new guidance as concerns effective modal bandwidth in the 840 nm to 953 nm
wavelength range which was not considered mature enough during the development of
It is expected that the content of this amendment will be incorporated into the future edition 4
of IEC 60794-2-21.
– 6 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
1 Scope
This part of IEC 60794 presents the detailed requirements specific to this type of cable to
ensure compatibility with the series of International Standards ISO/IEC 11801, Information
technology – Generic cabling for customer premises (Parts 1 to 6).
The requirements of family specification IEC 60794-2-20 are applicable to cables covered by
this document.
Particular requirements detailed in Clause 4 define either a specific option in relation to the
requirements of IEC 60794-2-20 or additional requirements.
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 60793-2-50:2018, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
IEC 60794-1-1:2015, Optical Fibre cables – Part 1-1: Generic specification – General
IEC 60794-2-20:2013, Optical fibre cables – Part 2-20: Indoor cables – Family specification
for multi-fibre optical cables
3 Terms and definitions
No terms and definitions are listed in this document.
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
_________
Edition 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
© IEC 2020
4 General requirements
The cable shall comply with the family specification IEC 60794-2-20 and meet the
requirements that are defined in it.
The optical fibre contained in the cables which are covered by this document shall comply
with one of the following International Standards and meet the requirements defined within
them as applicable:
• IEC 60793-2-50:2018, Annex A (single-mode B-652.D fibre);
• IEC 60793-2-50:2018, Annex F (single-mode B-657 fibres);
• IEC 60793-2-10:— , Annex A (multimode A1-OM3 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM4 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM5 fibre).
To ensure compatibility with ISO/IEC 11801 (all parts), optical performance level requirements
are presented in terms of the performance classification codes for cabled optical fibre as
follows:
• OS1a Single-mode fibre, categories B-652.D or B-657;
• OS2 Single-mode fibre, categories B-652.D or B-657;
• OM3 Multimode fibre, A1-OM3 category;
• OM4 Multimode fibre, A1-OM4 category;
• OM5 Multimode fibre, A1-OM5 category.
NOTE These codes are informative from the perspective of the requirements defined in this document. The OS1,
OM1 and OM2 performance classification codes for cabled optical fibre are no longer normative in
ISO/IEC 11801 (all parts). See ISO/IEC 11801-1:2017, Annex F, for more information.
5 Particular requirements
5.1 Fibre selection for cable testing
The fibre selection for cable testing shall be performed according to IEC 60794-1-1:2015,
Annex B.
5.2 Environmental requirements – Temperature cycling
The cable shall be tested as per IEC 60794-2-20:2013, 4.4, and shall meet one of the
following temperature ranges as per the MICE classification system:
• C : −10 °C to +60 °C;
• C : −25 °C to +70 °C:
: −40 °C to +70 °C.
• C
The test shall be performed on a 50 m specimen.
The maximum increase in attenuation shall be agreed between customer and supplier.
_________
Editioni 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
– 8 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
5.3 Transmission requirements
5.3.1 Attenuation of cabled fibre
Depending on the fibre category, the attenuation coefficient of the cabled fibre shall be less
than the maximum values in Table 1 for the multimode fibres and less than the maximum
values in Table 2 for single-mode fibres – for the wavelengths listed in Table 2.
The fibre category shall be agreed between customer and supplier.
Table 1 – Multimode cable maximum attenuation coefficient (dB/km)
Fibre Attenuation Attenuation Performance codes
coefficient at 850 coefficient at
nm 1300 nm
IEC 60793-2-10, A1-OM3 3,0 1,5 OM3
IEC 60793-2-10, A1-OM4 3,0 1,5 OM4
IEC 60793-2-10, A1-OM5 3,0 1,5 OM5
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km)
Fibre Wavelengths Maximum Performance codes
attenuation
nm
coefficient
IEC 60793-2-50, B-652.D and B-657 1 310, 1 383, 1 550 1,0 OS1a
IEC 60793-2-50, B-652.D and B-657 1 310, 1 383, 1 550 0,4 OS2
5.3.2 Fibre bandwidth requirements
There are no bandwidth requirements for single-mode fibre.
For cables containing multimode fibres, the uncabled fibre shall be specified at one of
performance levels defined in Table 3 in terms of minimum bandwidth (MHz·km), wavelength,
and type of measurement.
The fibre category and performance level shall be agreed between customer and supplier.
Table 3 – Minimum multimode fibre bandwidth (MHz·km)
Fibre Nominal Overfilled Overfilled Overfilled Effective Effective Performance
core launch launch launch modal modal codes
bandwidth bandwidth bandwidth bandwidth bandwidth
diameter
at 850 nm at 953 nm at 1 300 nm at 850 nm at 953 nm
(µm)
IEC 60793-2- 50 1 500 n/a 500 2 000 n/a OM3
10, A1-OM3
Not specified Not specified
IEC 60793-2- 50 3 500 n/a 5
...
IEC 60794-2-21 ®
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
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
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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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.
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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.
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IEC 60794-2-21 ®
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-6758-5
– 2 – IEC 60794-2-21:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 6
5 Particular requirements . 6
5.1 Fibre selection for cable testing . 6
5.2 Environmental requirements – Temperature cycling . 6
5.3 Transmission requirements . 7
5.3.1 Attenuation of cabled fibre . 7
5.3.2 Fibre bandwidth requirements . 7
Bibliography . 8
Table 1 – Multimode cable maximum attenuation coefficient (dB/km) . 7
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km) . 7
Table 3 – Minimum multimode fibre bandwidth (MHz·km) . 7
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60794-2-21 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2012. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) incorporation of the OM5 cabled fibre performance category;
b) incorporation of the OS1a cabled fibre performance category;
c) cabled fibre performance categories OM1, OM2 and OS1 are no longer normative, and are
retained for information.
– 4 – IEC 60794-2-21:2019 © IEC 2019
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1925/FDIS 86A/1935RVD
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.
A list of all the parts in the IEC 60794 series, published under the general title Optical fibre
cables, can be found on the IEC website.
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.
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
1 Scope
This part of IEC 60794 presents the detailed requirements specific to this type of cable to
ensure compatibility with the series of International Standards ISO/IEC 11801, Information
technology – Generic cabling for customer premises (Parts 1 to 6).
The requirements of family specification IEC 60794-2-20 are applicable to cables covered by
this document.
Particular requirements detailed in Clause 4 define either a specific option in relation to the
requirements of IEC 60794-2-20 or additional requirements.
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 60793-2-50:2018, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
IEC 60794-1-1:2015, Optical Fibre cables – Part 1-1: Generic specification – General
IEC 60794-2-20:2013, Optical fibre cables – Part 2-20: Indoor cables – Family specification
for multi-fibre optical cables
3 Terms and definitions
No terms and definitions are listed in this document.
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
_________
Edition 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
– 6 – IEC 60794-2-21:2019 © IEC 2019
4 General requirements
The cable shall comply with the family specification IEC 60794-2-20 and meet the
requirements that are defined in it.
The optical fibre contained in the cables which are covered by this document shall comply
with one of the following International Standards and meet the requirements defined within
them as applicable:
• IEC 60793-2-50:2018, Annex A (single-mode B-652.D fibre);
• IEC 60793-2-50:2018, Annex F (single-mode B-657 fibres);
• IEC 60793-2-10:— , Annex A (multimode A1-OM3 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM4 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM5 fibre).
To ensure compatibility with ISO/IEC 11801 (all parts), optical performance level requirements
are presented in terms of the performance classification codes for cabled optical fibre as
follows:
• OS1a Single-mode fibre, categories B-652.D or B-657;
• OS2 Single-mode fibre, categories B-652.D or B-657;
• OM3 Multimode fibre, A1-OM3 category;
• OM4 Multimode fibre, A1-OM4 category;
• OM5 Multimode fibre, A1-OM5 category.
NOTE These codes are informative from the perspective of the requirements defined in this document. The OS1,
OM1 and OM2 performance classification codes for cabled optical fibre are no longer normative in
ISO/IEC 11801 (all parts). See ISO/IEC 11801-1:2017, Annex F, for more information.
5 Particular requirements
5.1 Fibre selection for cable testing
The fibre selection for cable testing shall be performed according to IEC 60794-1-1:2015,
Annex B.
5.2 Environmental requirements – Temperature cycling
The cable shall be tested as per IEC 60794-2-20:2013, 4.4, and shall meet one of the
following temperature ranges as per the MICE classification system:
• C : −10 °C to +60 °C;
• C : −25 °C to +70 °C:
: −40 °C to +70 °C.
• C
The test shall be performed on a 50 m specimen.
The maximum increase in attenuation shall be agreed between customer and supplier.
_________
Editioni 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
5.3 Transmission requirements
5.3.1 Attenuation of cabled fibre
Depending on the fibre category, the attenuation coefficient of the cabled fibre shall be less
than the maximum values in Table 1 for the multimode fibres and less than the maximum
values in Table 2 for single-mode fibres – for the wavelengths listed in Table 2.
The fibre category shall be agreed between customer and supplier.
Table 1 – Multimode cable maximum attenuation coefficient (dB/km)
Fibre Attenuation Attenuation Performance codes
coefficient at 850 coefficient at
nm 1300 nm
IEC 60793-2-10, A1-OM3 3,0 1,5 OM3
IEC 60793-2-10, A1-OM4 3,0 1,5 OM4
IEC 60793-2-10, A1-OM5 3,0 1,5 OM5
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km)
Fibre Wavelengths Maximum Performance codes
attenuation
nm
coefficient
IEC 60793-2-50, B-652.D and B-657 1 310, 1 383, 1 550 1,0 OS1a
IEC 60793-2-50, B-652.D and B-657 1 310, 1 383, 1 550 0,4 OS2
5.3.2 Fibre bandwidth requirements
There are no bandwidth requirements for single-mode fibre.
For cables c
...
IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
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.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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 IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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.
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IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-9524-3
IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
– 2 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION to Amendment . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 Particular requirements . 7
5.1 Fibre selection for cable testing . 7
5.2 Environmental requirements – Temperature cycling . 7
5.3 Transmission requirements . 8
5.3.1 Attenuation of cabled fibre . 8
5.3.2 Fibre bandwidth requirements . 8
Bibliography . 9
Table 1 – Multimode cable maximum attenuation coefficient (dB/km) . 8
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km) . 8
Table 3 – Minimum multimode fibre bandwidth (MHz·km) . 8
© IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60794-2-21 edition 3.1 contains the third edition (2019-04) [documents
86A/1925/FDIS and 86A/1935RVD] and its amendment 1 (2020-11) [documents
86A/2012/CDV and 86A/2055/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
– 4 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
International Standard IEC 60794-2-21 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) incorporation of the OM5 cabled fibre performance category;
b) incorporation of the OS1a cabled fibre performance category;
c) cabled fibre performance categories OM1, OM2 and OS1 are no longer normative, and are
retained for information.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60794 series, published under the general title Optical fibre
cables, can be found on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability 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.
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.
© IEC 2020
INTRODUCTION to Amendment
This amendment adds an important update considered during the development of the base
publication, IEC 60794-2-21:2019.
As regards minimum multimode fibre bandwidth requirements (Table 3), this amendment
provides new guidance as concerns effective modal bandwidth in the 840 nm to 953 nm
wavelength range which was not considered mature enough during the development of
It is expected that the content of this amendment will be incorporated into the future edition 4
of IEC 60794-2-21.
– 6 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
1 Scope
This part of IEC 60794 presents the detailed requirements specific to this type of cable to
ensure compatibility with the series of International Standards ISO/IEC 11801, Information
technology – Generic cabling for customer premises (Parts 1 to 6).
The requirements of family specification IEC 60794-2-20 are applicable to cables covered by
this document.
Particular requirements detailed in Clause 4 define either a specific option in relation to the
requirements of IEC 60794-2-20 or additional requirements.
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 60793-2-50:2018, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
IEC 60794-1-1:2015, Optical Fibre cables – Part 1-1: Generic specification – General
IEC 60794-2-20:2013, Optical fibre cables – Part 2-20: Indoor cables – Family specification
for multi-fibre optical cables
3 Terms and definitions
No terms and definitions are listed in this document.
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
_________
Edition 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
© IEC 2020
4 General requirements
The cable shall comply with the family specification IEC 60794-2-20 and meet the
requirements that are defined in it.
The optical fibre contained in the cables which are covered by this document shall comply
with one of the following International Standards and meet the requirements defined within
them as applicable:
• IEC 60793-2-50:2018, Annex A (single-mode B-652.D fibre);
• IEC 60793-2-50:2018, Annex F (single-mode B-657 fibres);
• IEC 60793-2-10:— , Annex A (multimode A1-OM3 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM4 fibre);
• IEC 60793-2-10: —, Annex A (multimode A1-OM5 fibre).
To ensure compatibility with ISO/IEC 11801 (all parts), optical performance level requirements
are presented in terms of the performance classification codes for cabled optical fibre as
follows:
• OS1a Single-mode fibre, categories B-652.D or B-657;
• OS2 Single-mode fibre, categories B-652.D or B-657;
• OM3 Multimode fibre, A1-OM3 category;
• OM4 Multimode fibre, A1-OM4 category;
• OM5 Multimode fibre, A1-OM5 category.
NOTE These codes are informative from the perspective of the requirements defined in this document. The OS1,
OM1 and OM2 performance classification codes for cabled optical fibre are no longer normative in
ISO/IEC 11801 (all parts). See ISO/IEC 11801-1:2017, Annex F, for more information.
5 Particular requirements
5.1 Fibre selection for cable testing
The fibre selection for cable testing shall be performed according to IEC 60794-1-1:2015,
Annex B.
5.2 Environmental requirements – Temperature cycling
The cable shall be tested as per IEC 60794-2-20:2013, 4.4, and shall meet one of the
following temperature ranges as per the MICE classification system:
• C : −10 °C to +60 °C;
• C : −25 °C to +70 °C:
: −40 °C to +70 °C.
• C
The test shall be performed on a 50 m specimen.
The maximum increase in attenuation shall be agreed between customer and supplier.
_________
Editioni 7 under preparation. Stage at the time of publication: IEC DECFDIS 60793-2-10:2019.
– 8 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
5.3 Transmission requirements
5.3.1 Attenuation of cabled fibre
Depending on the fibre category, the attenuation coefficient of the cabled fibre shall be less
than the maximum values in Table 1 for the multimode fibres and less than the maximum
values in Table 2 for single-mode fibres – for the wavelengths listed in Table 2.
The fibre category shall be agreed between customer and supplier.
Table 1 – Multimode cable maximum attenuation coefficient (dB/km)
Fibre Attenuation Attenuation Performance codes
coefficient at 850 coefficient at
nm 1300 nm
IEC 60793-2-10, A1-OM3 3,0 1,5 OM3
IEC 60793-2-10, A1-OM4 3,0 1,5 OM4
IEC 60793-2-10, A1-OM5 3,0 1,5 OM5
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km)
Fibre Wavelengths Maximum Performance codes
attenuation
nm
coefficient
IEC 60793-2-50, B-652.D and B-657 1 310, 1 383, 1 550 1,0 OS1a
IEC 60793-2-50, B-652.D and B-657 1 310, 1 383, 1 550 0,4 OS2
5.3.2 Fibre bandwidth requirements
There are no bandwidth requirements for single-mode fibre.
For cables containing multimode fibres, the uncabled fibre shall be specified at one of
performance levels defined in Table 3 in terms of minimum bandwidth (MHz·km), wavelength,
and type of measurement.
The fibre category and performance level shall be agreed between customer and supplier.
Table 3 – Minimum multimode fibre bandwidth (MHz·km)
Fibre Nominal Overfilled Overfilled Overfilled Effective Effective Performance
core launch launch launch modal modal codes
bandwidth bandwidth bandwidth bandwidth bandwidth
diameter
at 850 nm at 953 nm at 1 300 nm at 850 nm at 953 nm
(µm)
IEC 60793-2- 50 1 500 n/a 500 2 000 n/a OM3
10, A1-OM3
Not specified Not specified
IEC 60793-2- 50 3 500 n/a 500 4 700 n/a OM4
10, A1-OM4
Not specified Not specified
IEC 60793-2- 50 3 500 1 850 500 4 700 2 470 OM5
10, A1-OM5
NOTE Effective modal bandwidth guidance is provided at all wavelengths in the 840 nm to 953 nm range in
IEC 60793-2-10. For OM3, the guidance is 1 033 MHz·km at 953 nm. For OM4, the guidance is 1 459 MHz·km at
953 nm.
© IEC 2020
Bibliography
IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable
test procedures – Mechanical test methods
IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable
test procedures – Environmental test methods
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods
IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 60794-2-10:2011, Optical fibre cables – Part 2-10: Indoor optical fibre cables – Family
specification for simplex and duplex cables
ISO/IEC 11801-1:2017, Information technology – Generic cabling for customer premises –
Part 1: General requirements
ISO/IEC 11801-2, Information technology – Generic cabling for customer premises – Part 2:
Office premises
ISO/IEC 11801-3, Information technology – Generic cabling for customer premises – Part 3:
Industrial premises
ISO/IEC 11801-4, Information technology – Generic cabling for customer premises – Part 4:
Single-tenant homes
ISO/IEC 11801-5, Information technology – Generic cabling for customer premises – Part 5:
Data centres
ISO/IEC 11801-6, Information technology – Generic cabling for customer premises – Part 6:
Distributed building services
___________
– 10 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
SOMMAIRE
AVANT-PROPOS . 11
INTRODUCTION à l’Amendement . 13
1 Domaine d'application . 14
2 Références normatives . 14
3 Termes et définitions . 14
4 Exigences générales . 15
5 Exigences particulières . 15
5.1 Choix de fibre pour les essais des câbles . 15
5.2 Exigences environnementales – Cycles de température . 15
5.3 Exigences de transmission . 16
5.3.1 Affaiblissement de la fibre câblée . 16
5.3.2 Exigences de largeur de bande de la fibre . 16
Bibliographie . 17
Tableau 1 – Affaiblissement linéique maximal du câble multimodal (dB/km) . 16
Tableau 2 – Affaiblissement linéique maximal du câble unimodal (dB/km) . 16
Tableau 3 – Largeur de bande minimale de fibre multimodale (MHz·km) . 16
© IEC 2020
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
CÂBLES À FIBRES OPTIQUES –
Partie 2-21: Câbles intérieurs –
Spécification particulière pour les câbles optiques
multifibres de distribution utilisés dans le câblage de locaux
AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L’IEC a pour
objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines
de l'électricité et de l'électronique. À cet effet, l’IEC – entre autres activités – publie des Normes
internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
public (PAS) et des Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des
comités d'études, aux travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les
organisations internationales, gouvernementales et non gouvernementales, en liaison avec l’IEC, participent
également aux travaux. L’IEC collabore étroitement avec l'Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l'IEC concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux intéressés
sont représentés dans chaque comité d’études.
3) Les Publications de l’IEC se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de l’IEC. Tous les efforts raisonnables sont entrepris afin que l’IEC
s'assure de l'exactitude du contenu technique de ses publications; l’IEC ne peut pas être tenue responsable de
l'éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d'encourager l'uniformité internationale, les Comités nationaux de l’IEC s'engagent, dans toute la
mesure possible, à appliquer de façon transparente les Publications de l’IEC dans leurs publications nationales
et régionales. Toutes divergences entre toutes Publications de l’IEC et toutes publications nationales ou
régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) L'IEC elle-même ne fournit aucune attestation de conformité. Des organismes de certification indépendants
fournissent des services d'évaluation de conformité et, dans certains secteurs, accèdent aux marques de
conformité de l’IEC. L’IEC n'est responsable d'aucun des services effectués par les organismes de certification
indépendants.
6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à l'IEC, à ses administrateurs, employés, auxiliaires ou
mandataires, y compris ses experts particuliers et les membres de ses comités d'études et des Comités
nationaux de l'IEC, pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre
dommage de quelque nature que ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais
de justice) et les dépenses découlant de la publication ou de l'utilisation de cette Publication de l'IEC ou de
toute autre Publication de l'IEC, ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L’attention est attirée sur le fait que certains des éléments de la présente Publication de l'IEC peuvent faire
l’objet de droits de brevet. L’IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits
de brevets et de ne pas avoir signalé leur existence.
Cette version consolidée de la Norme IEC officielle et de son amendement a été
préparée pour la commodité de l'utilisateur.
L'IEC 60794-2-21 édition 3.1 contient la troisième édition (2019-04) [documents
86A/1925/FDIS et 86A/1935RVD] et son amendement 1 (2020-11) [documents
86A/2012/CDV et 86A/2055/RVC].
Dans cette version Redline, une ligne verticale dans la marge indique où le contenu
technique est modifié par l'amendement 1. Les ajouts sont en vert, les suppressions
sont en rouge, barrées. Une version Finale avec toutes les modifications acceptées est
disponible dans cette publication.
– 12 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
La Norme internationale IEC 60794-2-21 a été établie par le sous-comité 86A: Fibres et
câbles, du comité d’études 86 de l’IEC: Fibres optiques.
La présente troisième édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition
précédente:
a) l’intégration de la catégorie de performance de fibres câblées OM5;
b) l’intégration de la catégorie de performance de fibres câblées OS1a;
c) Les catégories de performance de fibres câblées OM1, OM2 et OS1 ne sont plus
normatives, et sont conservées pour information.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2.
Une liste de toutes les parties de la série IEC 60794, publiées sous le titre général Câbles à
fibres optiques, peut être consultée sur le site web de l'IEC.
Le comité a décidé que le contenu de la publication de base et de son amendement ne sera
pas modifié avant la date de stabilité indiquée sur le site web de l’IEC sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. A cette date,
la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
IMPORTANT – Le logo "colour inside" qui se trouve sur la page de couverture de cette
publication indique qu'elle contient des couleurs qui sont considérées comme utiles à
une bonne compréhension de son contenu. Les utilisateurs devraient, par conséquent,
imprimer cette publication en utilisant une imprimante couleur.
© IEC 2020
INTRODUCTION à l’Amendement
Le présent amendement fournit une mise à jour importante prise en considération lors de
l'élaboration de la publication de base, l’IEC 60794-2-21:2019.
Pour ce qui concerne les exigences relatives à la largeur de bande minimale de fibre
multimodale (Tableau 3), cet amendement fournit de nouvelles recommandations portant sur
la largeur de bande modale effective dans la plage de longueurs d'onde de 840 nm à 953 nm,
qui n'était pas considérée comme suffisamment aboutie lors de l’élaboration de
l’IEC 60794-2-21:2019.
Il est prévu que le contenu du présent amendement soit transposé dans l’édition 4 à venir de
l’IEC 60794-2-21.
– 14 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
CÂBLES À FIBRES OPTIQUES –
Partie 2-21: Câbles intérieurs –
Spécification particulière pour les câbles optiques
multifibres de distribution utilisés dans le câblage de locaux
1 Domaine d'application
La présente partie de l’IEC 60794 fournit les exigences particulières spécifiques à ce type de
câble dont l’objet est d’assurer la compatibilité avec la série de Normes internationales
ISO/IEC 11801, Technologies de l’information – Câblage générique des locaux d’utilisateurs
(Parties 1 à 6).
Les exigences contenues dans la spécification de famille IEC 60794-2-20 sont applicables
aux câbles couverts par le présent document.
Les exigences particulières contenues dans l'Article 4 définissent soit des options spécifiques
relatives aux exigences de l’IEC 60794-2-20, soit des exigences complémentaires.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l'édition citée s'applique. Pour les références non datées, la dernière édition du document de
référence s'applique (y compris les éventuels amendements).
IEC 60793-2-10:—, Fibres optiques – Partie 2-10: Spécifications de produits – Spécification
intermédiaire pour les fibres multimodales de la catégorie A1
IEC 60793-2-50:2018, Fibres optiques – Partie 2-50: Spécifications de produits –
Spécification intermédiaire pour les fibres unimodales de classe B
IEC 60794-1-1:2015, Câbles à fibres optiques – Partie 1-1: Spécification générique –
Généralités
IEC 60794-2-20:2013, Câbles à fibres optiques – Partie 2-20: Câbles intérieurs –
Spécification de famille pour les câbles optiques multifibres
3 Termes et définitions
Aucun terme n'est défini dans le présent document.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
• IEC Electropedia: disponible à l'adresse http://www.electropedia.org/
• ISO Online browsing platform: disponible à l'adresse http://www.iso.org/obp
_________
Edition 7 en cours d'élaboration. Stade au moment de la publication: IEC DECFDIS 60793-2-10:2019.
© IEC 2020
4 Exigences générales
Le câble doit être conforme à la spécification de famille IEC 60794-2-20 et satisfaire aux
exigences qui y sont définies.
La fibre optique contenue dans les câbles qui font l’objet du présent document doit être
conforme à l’une des Normes internationales suivantes et satisfaire aux exigences qui y sont
définies, selon applicabilité.
• IEC 60793-2-50:2018, Annexe A (fibre unimodale B-652.D);
• IEC 60793-2-50:2018, Annexe F (fibre unimodale B-657);
• IEC 60793-2-10:— , Annexe A (fibre multimodale A1-OM3);
• IEC 60793-2-10:—, Annexe A (fibre multimodale A1-OM4);
• IEC 60793-2-10:—, Annexe A (fibre multimodale A1-OM5).
Afin d’assurer la compatibilité avec l'ISO/IEC 11801 (toutes les parties), les exigences de
niveaux de performance optique sont représentées sous la forme des codes de classification
des performances des fibres optiques câblées comme suit:
• OS1a Fibre unimodale, catégories B-652.D ou B-657;
• OS2 Fibre unimodale, catégories B-652.D ou B-657;
• OM3 Fibre multimodale, catégorie A1-OM3;
• OM4 Fibre multimodale, catégorie A1-OM4;
• OM5 Fibre multimodale, catégorie A1-OM5.
NOTE Ces codes sont donnés à titre d'information sous l’angle des exigences définies dans le présent document.
Les codes de classification de performance OS1, OM1 et OM2 pour les fibres optiques câblées ne sont plus
normatifs dans l'ISO/IEC 11801 (toutes les parties). Voir l’ISO/IEC 11801-1:2017, Annexe F, pour de plus amples
informations.
5 Exigences particulières
5.1 Choix de fibre pour les essais des câbles
Le choix de fibre pour les essais des câbles doit être réalisé conformément à
l’IEC 60794-1-1:2015, Annexe B.
5.2 Exigences environnementales – Cycles de température
Le câble doit être soumis à l’essai selon l’IEC 60794-2-20:2013, 4.4, et doit satisfaire à l’une
des plages de température suivantes selon le système de classement MICE:
• C : −10 °C à +60 °C;
• C : −25 °C à +70 °C:
• C : −40 °C à +70 °C.
L’essai doit être réalisé sur un spécimen de 50 m.
L’augmentation maximale d’affaiblissement doit faire l’objet d’un accord entre le client et le
fournisseur.
_________
Edition 7 en cours d'élaboration. Stade au moment de la publication: IEC DECFDIS 60793-2-10:2019.
– 16 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
5.3 Exigences de transmission
5.3.1 Affaiblissement de la fibre câblée
En fonction de la catégorie de fibre, l’affaiblissement linéique de la fibre câblée doit être
inférieur aux valeurs maximales du Tableau 1 pour les fibres multimodales et inférieur aux
valeurs maximales du Tableau 2 pour les fibres unimodales – pour les longueurs d’onde
indiquées dans le Tableau 2.
La catégorie de fibre doit faire l’objet d’un accord entre le client et le fournisseur.
Tableau 1 – Affaiblissement linéique maximal du câble multimodal (dB/km)
Affaiblissement Affaiblissement
Fibre Codes de performance
linéique à 850 nm linéique à
1300 nm
IEC 60793-2-10, A1-OM3 3,0 1,5 OM3
IEC 60793-2-10, A1-OM4 3,0 1,5 OM4
IEC 60793-2-10, A1-OM5 3,0 1,5 OM5
Tableau 2 – Affaiblissement linéique maximal du câble unimodal (dB/km)
Fibre Longueurs d’onde Affaiblissement Codes de
linéique maximal performance
nm
IEC 60793-2-50, B-652.D et B-657 1 310, 1 383, 1 550 1,0 OS1a
IEC 60793-2-50, B-652.D et B-657 1 310, 1 383, 1 550 0,4 OS2
5.3.2 Exigences de largeur de bande de la fibre
Il n’existe pas d'exigences de largeur de bande pour les fibres unimodales.
Pour les câbles contenant des fibres multimodales, la fibre non câblée doit être spécifiée par
l’un des niveaux de performances indiqués dans le Tableau 3 en termes de largeur de bande
minimale (MHz·km), de longueur d’onde et de type de mesure.
La catégorie de fibre et le niveau de performance doivent faire l'objet d'un accord entre le
client et le fournisseur.
Tableau 3 – Largeur de bande minimale de fibre multimodale (MHz·km)
Fibre Diamètre Largeur de Largeur de Largeur de Largeur de Largeur de Codes de
nominal du bande bande bande bande bande performance
cœur d’injection d’injection d’injection modale modale
saturée à saturée à saturée à effective à effective à
(µm)
850 nm 953 nm 1 300 nm 850 nm 953 nm
IEC 60793-2- 50 1 500 n/a 500 2 000 n/a OM3
10, A1-OM3
Non spécifiée Non spécifiée
IEC 60793-2- 50 3 500 n/a 500 4 700 n/a OM4
10, A1-OM4
Non spécifiée Non spécifiée
IEC 60793-2- 50 3 500 1 850 500 4 700 2 470 OM5
10, A1-OM5
NOTE La recommandation portant sur la largeur de bande modale effective est fournie dans l’IEC 60793-2-10, à
toutes les longueurs d'onde dans la plage comprise entre 840 nm et 953 nm. S’agissant d’OM3, la
recommandation correspond à 1 033 MHz·km à 953 nm. S’agissant d’OM4, la recommandation correspond à
1 459 MHz·km à 953 nm.
© IEC 2020
Bibliographie
IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable
test procedures – Mechanical test methods (disponible en anglais seulement)
IEC 60794-1-22, Câbles à fibres optiques – Partie 1-22: Spécification générique – Procédures
fondamentales d’essais des câbles optiques – Méthodes d’essais d’environnement
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods (disponible en anglais seulement)
IEC 60794-2, Câbles à fibres optiques – Partie 2: Câbles intérieurs – Spécification
intermédiaire
IEC 60794-2-10:2011, Câbles à fibres optiques – Partie 2-10: Câbles intérieurs à fibres
optiques – Spécification de famille pour les câbles simplex et duplex
ISO/IEC 11801-1:2017, Information technology – Generic cabling for customer premises –
Part 1: General requirements (disponible en anglais seulement)
ISO/IEC 11801-2, Information technology – Generic cabling for customer premises – Part 2:
Office premises (disponible en anglais seulement)
ISO/IEC 11801-3, Information technology – Generic cabling for customer premises – Part 3:
Industrial premises (disponible en anglais seulement)
ISO/IEC 11801-4, Information technology – Generic cabling for customer premises – Part 4:
Single-tenant homes (disponible en anglais seulement)
ISO/IEC 11801-5, Information technology – Generic cabling for customer premises – Part 5:
Data centres (disponible en anglais seulement)
ISO/IEC 11801-6, Information technology – Generic cabling for customer premises – Part 6:
Distributed building services (disponible en anglais seulement)
___________
IEC 60794-2-21 ®
Edition 3.1 2020-11
CONSOLIDATED VERSION
FINAL VERSION
VERSION FINALE
Optical fibre cables –
Part 2-21: Indoor cables – Detailed specification for multi-fibre optical
distribution cables for use in premises cabling
Câbles à fibres optiques –
Partie 2-21: Câbles intérieurs – Spécification particulière pour les câbles
optiques multifibres de distribution utilisés dans le câblage de locaux
– 2 – IEC 60794-2-21:2019+AMD1:2020 CSV
© IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION to Amendment . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 Particular requirements . 7
5.1 Fibre selection for cable testing . 7
5.2 Environmental requirements – Temperature cycling . 7
5.3 Transmission requirements . 8
5.3.1 Attenuation of cabled fibre . 8
5.3.2 Fibre bandwidth requirements . 8
Bibliography . 9
Table 1 – Multimode cable maximum attenuation coefficient (dB/km) . 8
Table 2 – Single-mode cable maximum attenuation coefficient (dB/km) . 8
Table 3 – Minimum multimode fibre bandwidth (MHz·km) . 8
© IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-21: Indoor cables –
Detailed specification for multi-fibre optical distribution cables
for use in premises cabling
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 prepar
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