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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
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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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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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
...