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 is available as IEC 60794-2-21:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
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
IEC 60794-2-21:2019 est disponible sous forme de IEC 60794-2-21:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
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
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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
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.
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IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
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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
...
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 c
...
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
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
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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 Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and once 67 000 electrotechnical terminology entries in English and
a month by email. French extracted from the Terms and Definitions clause of IEC
publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or need CISPR.
further assistance, please contact the Customer Service
Centre: 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.
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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
...
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
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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.
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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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Restez informé sur les nouvelles publications IEC. Just
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publication ou si vous avez des questions contactez-nous:
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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
...
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