SIST EN 60793-2-50:2016

Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2015)

This part of IEC 60793 is applicable to optical fibre categories B1.1, B1.2, B1.3, B2, B4, B5
and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown
in Annex I. These fibres are used or can be incorporated in information transmission
equipment and optical fibre cables.
Three types of requirements apply to these fibres:
– general requirements, as defined in IEC 60793-2;
– specific requirements common to the class B single-mode fibres covered in this standard
and which are given in Clause 5;
– particular requirements applicable to individual fibre categories or specific applications,
which are defined in Annexes A to G.
For some fibre categories (shown in the relevant family specifications), there are subcategories
that are distinguished on the basis of difference in transmission attribute
specifications. The designations for these sub-categories are documented in the individual
family specifications.

Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für Einmodenfasern der Kategorie B

Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B

L'IEC 60793-2-50:2015 est applicable aux fibres optiques des catégories B1.1, B1.2, B1.3, B2, B4, B5 et B6. Un tableau illustrant la correspondance des désignations IEC avec les Recommandations de l'UIT-T figure à l'Annexe I. Ces fibres sont utilisées ou peuvent être intégrées dans des équipements pour la transmission de l'information et dans des câbles à fibres optiques. Trois types d'exigences s'appliquent à ces fibres:
- les exigences générales, qui sont définies dans l'IEC 60793-2;
- des exigences spécifiques communes aux fibres unimodales de classe B, couvertes par la présente norme, et qui sont données dans l'Article 5;
- des exigences particulières applicables à des catégories particulières de fibres ou à des applications données, qui sont définies dans les Annexes A à G. Pour certaines catégories de fibres (indiquées dans les spécifications de famille correspondantes), il existe des sous-catégories qui se distinguent les unes des autres par leurs différences de spécifications d'attributs de transmission. Les désignations pour ces sous-catégories sont documentées dans les spécifications de famille individuelles Cette cinquième édition annule et remplace la quatrième édition parue en 2012. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- alignement des exigences avec les Recommandations G.654 (2012-10) et G.657 (2012-10) de l'UIT-T;
- ajout d'une nouvelle sous-catégorie B1.2_d;
- modification des sous-catégories B6 en termes d'affaiblissement et de coefficient de dispersion chromatique.
Mots clés: équipements pour la transmission de l'information, câbles à fibres optiques

Optična vlakna - 2-50. del: Specifikacije izdelka - Področna specifikacija za enorodna vlakna razreda B (IEC 60793-2-50:2015)

Ta del standarda IEC 60793 se uporablja za kategorije optičnih vlaken B1.1, B1.2, B1.3, B2, B4, B5 in B6. V dodatku I je prikaz povezav oznak IEC z oznakami ITU-T. Ta vlakna se uporabljajo ali se lahko vgradijo v opremo za prenos informacij in kable z optičnimi vlakni.
Za ta vlakna veljajo tri vrste zahtev:
– splošne zahteve, kot so opredeljene v standardu IEC 60793-2;
– posebne zahteve za enorodna vlakna razreda B, ki jih zajema ta standard in so navedene v točki 5;
– posebne zahteve, ki veljajo za posamezne kategorije vlaken ali posebne načine uporabe in so opredeljene v dodatkih A do G.
Pri nekaterih kategorijah vlaken (prikazano v ustreznih skupinskih specifikacijah) obstajajo podkategorije, ki se razlikujejo glede na razliko v specifikacijah atributa prenosa. Oznake za te podkategorije so navedene v posameznih skupinskih specifikacijah.

General Information

• Status: Withdrawn
• Publication Date: 03-Mar-2016
• Withdrawal Date: 09-Feb-2022
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 10-Feb-2022
• Due Date: 05-Mar-2022
• Completion Date: 10-Feb-2022
• Ref Project: EN 60793-2-50:2016 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres

Relations

• Replaces: SIST EN 60793-2-50:2013 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 24-Dec-2013
• Replaced By: SIST EN IEC 60793-2-50:2019 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2018)
• Effective Date: 05-Mar-2019
• Replaces: SIST EN 60793-2-50:2013 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 28-Jan-2023
• Revised: SIST EN 60793-2-50:2013 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 06-May-2014
• Replaces: SIST EN 60793-2-50:2013/AC:2015 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 23-Feb-2016
• Revised: SIST EN IEC 60793-2-50:2019 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2018)
• Effective Date: 23-Jan-2018

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60793-2-50:2016
01-maj-2016
1DGRPHãþD
SIST EN 60793-2-50:2013
SIST EN 60793-2-50:2013/AC:2015
2SWLþQDYODNQDGHO6SHFLILNDFLMHL]GHOND3RGURþQDVSHFLILNDFLMD]D
HQRURGQDYODNQDUD]UHGD%,(&
Optical fibres - Part 2-50: Product specifications - Sectional specification for class B
single-mode fibres (IEC 60793-2-50:2015)
Ta slovenski standard je istoveten z: EN 60793-2-50:2016
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN 60793-2-50:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60793-2-50:2016

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SIST EN 60793-2-50:2016


EUROPEAN STANDARD EN 60793-2-50

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2016
ICS 33.180.10 Supersedes EN 60793-2-50:2013
English Version
Optical fibres - Part 2-50: Product specifications - Sectional
specification for class B single-mode fibres
(IEC 60793-2-50:2015)
Fibres optiques - Partie 2-50: Spécifications de produits - Lichtwellenleiter - Teil 2-50: Produktspezifikationen -
Spécification intermédiaire pour les fibres unimodales de Rahmenspezifikation für Einmodenfasern der Kategorie B
classe B (IEC 60793-2-50:2015)
(IEC 60793-2-50:2015)
This European Standard was approved by CENELEC on 2015-12-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 60793-2-50:2016 E

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SIST EN 60793-2-50:2016
EN 60793-2-50:2016
European foreword
The text of document 86A/1571/CDV, future edition 5 of IEC 60793-2-50, prepared by SC 86A "Fibres
and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60793-2-50:2016.
The following dates are fixed:
(dop) 2016-09-24
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2018-12-24
• latest date by which the national standards conflicting with
the document have to be withdrawn

This document supersedes EN 60793-2-50:2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60793-2-50:2015 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated :
IEC 60794-2 NOTE Harmonized as EN 60794-2.
2

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SIST EN 60793-2-50:2016
EN 60793-2-50:2016
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60793-1 series Optical fibres - EN 60793-1 series
Part 1: Measurement methods and test
procedures
IEC 60793-1-1 -  Optical fibres - EN 60793-1-1 -
Part 1-1: Measurement methods and
test procedures - General and guidance
IEC 60793-1-20 -  Optical fibres - EN 60793-1-20 -
Part 1-20: Measurement methods and
test procedures - Fibre geometry
IEC 60793-1-21 -  Optical fibres - EN 60793-1-21 -
Part 1-21: Measurement methods and
test procedures - Coating geometry
IEC 60793-1-22 -  Optical fibres - EN 60793-1-22 -
Part 1-22: Measurement methods and
test procedures - Length measurement
IEC 60793-1-30 -  Optical fibres - EN 60793-1-30 -
Part 1-30: Measurement methods and
test procedures - Fibre proof test
IEC 60793-1-31 -  Optical fibres - EN 60793-1-31 -
Part 1-31: Measurement methods and
test procedures - Tensile strength
IEC 60793-1-32 -  Optical fibres - EN 60793-1-32 -
Part 1-32: Measurement methods and
test procedures - Coating strippability
IEC 60793-1-33 -  Optical fibres - EN 60793-1-33 -
Part 1-33: Measurement methods and
test procedures - Stress corrosion
susceptibility
IEC 60793-1-34 -  Optical fibres - EN 60793-1-34 -
Part 1-34: Measurement methods and
test procedures - Fibre curl
3

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SIST EN 60793-2-50:2016
EN 60793-2-50:2016
Publication Year Title EN/HD Year
IEC 60793-1-40 (mod) 2001 Optical fibres - EN 60793-1-40 2003
Part 1-40: Measurement methods and
test procedures - Attenuation
IEC 60793-1-42 -  Optical fibres - EN 60793-1-42 -
Part 1-42: Measurement methods and
test procedures - Chromatic dispersion
IEC 60793-1-44 -  Optical fibres - EN 60793-1-44 -
Part 1-44: Measurement methods and
test procedures - Cut-off wavelength
IEC 60793-1-45 -  Optical fibres - EN 60793-1-45 -
Part 1-45: Measurement methods and
test procedures - Mode field diameter
IEC 60793-1-46 -  Optical fibres - EN 60793-1-46 -
Part 1-46: Measurement methods and
test procedures - Monitoring of changes
in optical transmittance
IEC 60793-1-47 -  Optical fibres - EN 60793-1-47 -
Part 1-47: Measurement methods and
test procedures - Macrobending loss
IEC 60793-1-48 -  Optical fibres - EN 60793-1-48 -
Part 1-48: Measurement methods and
test procedures - Polarization mode
dispersion
IEC 60793-1-50 -  Optical fibres - EN 60793-1-50 -
Part 1-50: Measurement methods and
test procedures - Damp heat (steady
state) tests
IEC 60793-1-51 -  Optical fibres - EN 60793-1-51 -
Part 1-51: Measurement methods and
test procedures - Dry heat (steady state)
tests
IEC 60793-1-52 -  Optical fibres - EN 60793-1-52 -
Part 1-52: Measurement methods and
test procedures - Change of
temperature tests
IEC 60793-1-53 -  Optical fibres - EN 60793-1-53 -
Part 1-53: Measurement methods and
test procedures - Water immersion tests
IEC 60793-2 -  Optical fibres - EN 60793-2 -
Part 2: Product specifications - General
IEC 60794-3 -  Optical fibre cables - EN 60794-3 -
Part 3: Outdoor cables - Sectional
specification
IEC/TR 62316 -  Guidance for the interpretation of OTDR - -
backscattering traces

4

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SIST EN 60793-2-50:2016




IEC 60793-2-50

®


Edition 5.0 2015-11




INTERNATIONAL



STANDARD








colour

inside










Optical fibres –

Part 2-50: Product specifications – Sectional specification for class B

single-mode fibres


























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 33.180.10 ISBN 978-2-8322-3023-7



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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SIST EN 60793-2-50:2016
– 2 – IEC 60793-2-50:2015 © IEC 2015
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Abbreviations and symbols . 9
5 Specifications . 9
5.1 General . 9
5.2 Dimensional requirements . 9
5.3 Mechanical requirements . 10
5.4 Transmission requirements . 11
5.5 Environmental requirements . 12
5.5.1 General . 12
5.5.2 Optical environmental requirements – Attenuation . 13
5.5.3 Mechanical environmental requirements . 13
Annex A (normative) Family specification for category B1.1 single-mode fibres . 15
A.1 General . 15
A.2 Dimensional requirements . 15
A.3 Mechanical requirements . 15
A.4 Transmission requirements . 16
A.5 Environmental requirements . 16
Annex B (normative) Family specification for category B1.2 single-mode fibres . 17
B.1 General . 17
B.2 Dimensional requirements . 17
B.3 Mechanical requirements . 17
B.4 Transmission requirements . 18
B.5 Environmental requirements . 18
Annex C (normative) Family specification for category B1.3 single-mode fibres . 19
C.1 General . 19
C.2 Dimensional requirements . 19
C.3 Mechanical requirements . 19
C.4 Transmission requirements . 20
C.5 Hydrogen ageing for category B1.3 . 20
C.6 Environmental requirements . 21
Annex D (normative) Family specification for category B2 single-mode fibres . 22
D.1 General . 22
D.2 Dimensional requirements . 22
D.3 Mechanical requirements . 22
D.4 Transmission requirements . 23
D.4.1 General . 23
D.4.2 Chromatic dispersion coefficient requirement for sub-category B2_a
fibres . 23
D.4.3 Chromatic dispersion coefficient requirement for sub-category B2_b
fibres . 24
D.5 Environmental requirements . 24
Annex E (normative) Family specification for category B4 single-mode fibres . 25
E.1 General . 25

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SIST EN 60793-2-50:2016
IEC 60793-2-50:2015 © IEC 2015 – 3 –
E.2 Dimensional requirements . 25
E.3 Mechanical requirements . 25
E.4 Transmission requirements . 26
E.4.1 General . 26
E.4.2 Chromatic dispersion coefficient limits for sub-category B4_c fibres . 26
E.4.3 Chromatic dispersion coefficient limits for sub-category B4_d fibres . 27
E.4.4 Chromatic dispersion coefficient limits for sub-category B4_e fibres . 27
E.5 Environmental requirements . 27
Annex F (normative) Family specification for category B5 single-mode fibres . 28
F.1 General . 28
F.2 Dimensional requirements . 28
F.3 Mechanical requirements . 28
F.4 Transmission requirements . 29
F.4.1 General . 29
F.4.2 Chromatic dispersion coefficient for category B5 fibres . 29
F.5 Environmental requirements . 30
Annex G (normative) Family specification for category B6 single-mode fibres . 31
G.1 General . 31
G.2 Dimensional requirements . 31
G.3 Mechanical requirements . 32
G.4 Transmission requirements . 32
G.5 Environmental requirements . 33
Annex H (informative) System design information for category B4 single-mode fibres . 34
H.1 General . 34
H.2 One standard deviation limits for sub-category B4_d fibres . 34
H.3 One standard deviation limits for sub-category B4_e fibres . 35
Annex I (informative) Map from IEC nomenclature to ITU-T recommendations . 36
Bibliography . 37

Figure H.1 – Sub-category B4_d chromatic dispersion coefficient limits . 35
Figure H.2 – Sub-category B4_e chromatic dispersion coefficient limits . 35

Table 1 – Dimensional attributes and measurement methods . 9
Table 2 – Dimensional requirements common to all category B fibres . 10
Table 3 – Mechanical attributes and test methods . 10
Table 4 – Mechanical requirements common to all class B fibres . 11
Table 5 – Transmission attributes and measurement methods . 11
Table 6 – Transmission, requirements common to all class B fibres . 12
Table 7 – Additional transmission attributes required in the family specifications . 12
Table 8 – Environmental exposure tests . 12
Table 9 – Attributes measured in environmental exposure tests . 12
Table 10 – Change in attenuation for environmental tests . 13
Table 11 – Coating strip force for environmental tests . 13
Table 12 – Tensile strength for environmental tests . 13
Table 13 – Stress corrosion susceptibility for environmental tests . 14
Table A.1 – Dimensional requirements specific to category B1.1 fibres . 15

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SIST EN 60793-2-50:2016
– 4 – IEC 60793-2-50:2015 © IEC 2015
Table A.2 – Mechanical requirements specific to category B1.1 fibres . 15
Table A.3 – Transmission requirements specific to category B1.1 fibres . 16
Table B.1 – Dimensional requirements specific to category B1.2 fibres . 17
Table B.2 – Mechanical requirements specific to category B1.2 fibres . 18
Table B.3 – Transmission requirements specific to category B1.2 fibres . 18
Table C.1 – Dimensional requirements specific to category B1.3 fibres . 19
Table C.2 – Mechanical requirements specific to category B1.3 fibres . 19
Table C.3 – Transmission requirements specific to category B1.3 fibres . 20
Table D.1 – Dimensional requirements specific to category B2 fibres . 22
Table D.2 – Mechanical requirements specific to category B2 fibres . 23
Table D.3 – Transmission requirements specific to category B2 fibres . 23
Table E.1 – Dimensional requirements specific to category B4 fibres . 25
Table E.2 – Mechanical requirements specific to category B4 fibres . 26
Table E.3 – Transmission requirements specific to category B4 fibres . 26
Table F.1 – Dimensional requirements specific to category B5 fibres . 28
Table F.2 – Mechanical requirements specific to category B5 fibres . 29
Table F.3 – Transmission requirements specific to category B5 fibres . 29
Table G.1 – Dimensional requirements specific to category B6 fibres . 32
Table G.2 – Mechanical requirements specific to category B6 fibres . 32
Table G.3 – Transmission requirements specific to category B6 fibres . 33
Table H.1 – Examples for λ = 1 530 nm and λ = 1 565 nm . 34
min max
Table I.1 – Map of IEC to ITU . 36

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SIST EN 60793-2-50:2016
IEC 60793-2-50:2015 © IEC 2015 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRES –

Part 2-50: Product specifications –
Sectional specification for class B single-mode fibres

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 60793-2-50 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This fifth edition cancels and replaces the fourth edition, published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657
(2012-10);
b) adds a new sub-category B1.2_d;
c) modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient.

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SIST EN 60793-2-50:2016
– 6 – IEC 60793-2-50:2015 © IEC 2015
The text of this standard is based on the following documents:
CDV Report on voting
86A/1571/CDV 86A/1614/RVC

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.
A list of all parts in the IEC 60793 series published under the general title Optical fibres, can
be found on the IEC website.
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.
A bilingual version of this publication may be issued at a later date.

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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SIST EN 60793-2-50:2016
IEC 60793-2-50:2015 © IEC 2015 – 7 –
OPTICAL FIBRES –

Part 2-50: Product specifications –
Sectional specification for class B single-mode fibres



1 Scope
This part of IEC 60793 is applicable to optical fibre categories B1.1, B1.2, B1.3, B2, B4, B5
and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown
in Annex I. These fibres are used or can be incorporated in information transmission
equipment and optical fibre cables.
Three types of requirements apply to these fibres:
– general requirements, as defined in IEC 60793-2;
– specific requirements common to the class B single-mode fibres covered in this standard
and which are given in Clause 5;
– particular requirements applicable to individual fibre categories or specific applications,
which are defined in Annexes A to G.
For some fibre categories (shown in the relevant family specifications), there are sub-
categories that are distinguished on the basis of difference in transmission attribute
specifications. The designations for these sub-categories are documented in the individual
family specifications.
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.
IEC 60793-1 (all parts), Optical fibres – Measurement methods and test procedures
IEC 60793-1-1, Optical fibres – Measurement methods and test procedures – Part 1-1:
General and guidance
IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures –
Fibre geometry
IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures –
Coating geometry
IEC 60793-1-22, Optical fibres – Part 1-22: Measurement methods and test procedures –
Length measurement
IEC 60793-1-30, Optical fibres – Part 1-30: Measurement methods and test procedures –
Fibre proof test
IEC 60793-1-31, Optical fibres – Part 1-31: Measurement methods and test procedures –
Tensile strength

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SIST EN 60793-2-50:2016
– 8 – IEC 60793-2-50:2015 © IEC 2015
IEC 60793-1-32, Optical fibres – Part 1-32: Measurement methods and test procedures –
Coating strippability
IEC 60793-1-33, Optical fibres – Part 1-33: Measureme
...