IEC 60794-2-21:2012

IEC 60794-2-21


®


Edition 2.0 2012-05



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
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

Câbles à fibres optiques –
Partie 2-21: Câbles à fibres optiques intérieurs – Spécification particulière pour
les câbles optiques multi-fibres de distribution utilisés dans le câblage de
locaux


IEC 60794-2-21:2012

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IEC 60794-2-21



®



Edition 2.0 2012-05







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE
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




Câbles à fibres optiques –

Partie 2-21: Câbles à fibres optiques intérieurs – Spécification particulière pour


les câbles optiques multi-fibres de distribution utilisés dans le câblage de

locaux













INTERNATIONAL

ELECTROTECHNICAL

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INTERNATIONALE

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ICS 33.180.10 ISBN 978-2-83220-087-2



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® Registered trademark of the International Electrotechnical Commission
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---------------------- Page: 3 ----------------------
– 2 – 60794-2-21 © IEC:2012



CONTENTS




FOREWORD . 3

1 Scope . 5

2 Normative References . 5

3 General requirements . 5


4 Particular requirements . 6

4.1 Fibre selection for cable testing . 6
4.2 Environmental requirements – Temperature cycling . 6
4.3 Transmission requirements . 6
4.3.1 Attenuation of cabled fibre . 6
4.3.2 Fibre bandwidth requirements. 7
Bibliography . 8

Table 1 – Multimode maximum cable attenuation coefficient (dB/km) . 7
Table 2 – Single-mode maximum cable attenuation coefficient (dB/km) . 7
Table 3 – Minimum multimode fibre bandwidth (MHz × km) . 7

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60794-2-21 © IEC:2012 – 3 –


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
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International Standard IEC 60794-2-21 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2005. It constitutes a
technical revision.
The main changes are listed below:
• Incorporation of the OM4 cabled fibre performance category
• Incorporation of the OS2 cabled fibre performance category
• Incorporation of the B6_a1 and B6_a2 fibre category as per IEC 60793-2-50:2008

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– 4 – 60794-2-21 © IEC:2012


The text of this standard is based on the following documents:

FDIS Report on voting


86A/1441/FDIS 86A/1450/RVD



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

voting indicated in the above table.


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


The committee has decided that the contents of this publication 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.

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60794-2-21 © IEC:2012 – 5 –


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 International Standard presents the detailed requirements specific to this type of cable to
ensure compatibility with ISO/IEC 11801, Information technology − Generic cabling for
customer premises. The requirements of the Family Specification IEC 60794-2-20:2008 are
applicable to cables covered by this standard.
Particular requirements detailed in clause 4 either define a specific option relative to the
requirements of IEC 60794-2-20:2008 or define additional requirements.
2 Normative References
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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, Optical fibres − Part 2-50: Product specifications − Sectional
specification for class B single-mode fibres
IEC 60794-1-1:2011, 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, Optical fibre cables − Part 2-20: Indoor cables − Family specification
for multi-fibre optical distribution cable
3 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 standard shall comply with
one of the following standards and meet the normative requirements defined within them as
applicable:

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– 6 – 60794-2-21 © IEC:2012


• 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]


To ensure compatibility with ISO/IEC 11801, 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;
NOTE These codes are informative from the perspective of the requirements defined in this detailed specification.
4 Particular requirements
4.1 Fibre selection for cable testing
The fibre selection for cable testing shall be performed according to the 60794-1-1:2011,
Annex B.
4.2 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 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.

4.3 Transmission requirements
4.3.1 Attenuation of cabled fibre
Depending on the fibre category, the attenuation coefficient of the cabled fibre shall be less
than th
...