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)

IEC 60793-2-50:2015 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. 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:
- aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657 (2012-10);
- adds a new sub-category B1.2_d;
- modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient.
Keywords: information transmission equipment, optical fibre cables

Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für Einmodenfasern der Kategorie B (IEC 60793-2-50:2018)

Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B (IEC 60793-2-50:2018)

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 enorodovna vlakna razreda B (IEC 60793-2-50:2018)

Standard IEC 60793-2-50:2015 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 se uporabljajo za posamezne kategorije vlaken ali posebne vrste uporabe, ki so določene 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. Peta izdaja razveljavlja in nadomešča četrto izdajo, objavljeno leta 2012. Ta izdaja je tehnično popravljena izdaja. Ta izdaja vključuje naslednje znatne tehnične spremembe glede na prejšnjo izdajo:
– usklajuje zahteve s priporočiloma ITU-T G.654 (2012-10) in G.657 (2012-10);
– dodaja novo podkategorijo B1.2_d;
– spreminja podkategorije B6 v smislu koeficienta slabljenja in kromatske disperzije.
Ključne besede: oprema za prenos informacij, optični kabli

General Information

• Status: Published
• Publication Date: 25-Mar-2019
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Mar-2019
• Due Date: 23-May-2019
• Completion Date: 26-Mar-2019
• Ref Project: EN IEC 60793-2-50:2019 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres

Relations

• Revised: 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)
• Effective Date: 23-Jan-2018
• Replaces: 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)
• Effective Date: 05-Mar-2019
• Revised: oSIST prEN IEC 60793-2-50:2023 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B singlemode fibres
• Effective Date: 26-Jul-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60793-2-50:2019
01-maj-2019
1DGRPHãþD
SIST EN 60793-2-50:2016
2SWLþQDYODNQDGHO6SHFLILNDFLMHL]GHOND3RGURþQDVSHFLILNDFLMD]D
HQRURGRYQDYODNQDUD]UHGD%,(&
Optical fibres - Part 2-50: Product specifications - Sectional specification for class B
single-mode fibres (IEC 60793-2-50:2018)
Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für
Einmodenfasern der Kategorie B (IEC 60793-2-50:2018)
Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire
pour les fibres unimodales de classe B (IEC 60793-2-50:2018)
Ta slovenski standard je istoveten z: EN IEC 60793-2-50:2019
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN IEC 60793-2-50:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60793-2-50:2019

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SIST EN IEC 60793-2-50:2019


EUROPEAN STANDARD EN IEC 60793-2-50

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2019
ICS 33.180.10 Supersedes EN 60793-2-50:2016
English Version
Optical fibres - Part 2-50: Product specifications - Sectional
specification for class B single-mode fibres
(IEC 60793-2-50:2018)
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 60793-2-50:2018)
(IEC 60793-2-50:2018)
This European Standard was approved by CENELEC on 2019-01-18. 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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60793-2-50:2019 E

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SIST EN IEC 60793-2-50:2019
EN IEC 60793-2-50:2019 (E)
European foreword
The text of document 86A/1884/FDIS, future edition 6 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 IEC 60793-2-50:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-10-18
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-01-18
document have to be withdrawn

This document supersedes EN 60793-2-50:2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60793-2-50:2018 was approved by CENELEC as a
European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1
IEC 60794-3 NOTE Harmonized as EN 60794-3

2

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SIST EN IEC 60793-2-50:2019
EN IEC 60793-2-50:2019 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where 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
IEC 60793-1-20 -  Optical fibres - Part 1-20: Measurement EN 60793-1-20 -
methods and test procedures - Fibre
geometry
IEC 60793-1-21 -  Optical fibres - Part 1-21: Measurement EN 60793-1-21 -
methods and test procedures - Coating
geometry
IEC 60793-1-22 -  Optical fibres - Part 1-22: Measurement EN 60793-1-22 -
methods and test procedures - Length
measurement
IEC 60793-1-30 -  Optical fibres - Part 1-30: Measurement EN 60793-1-30 -
methods and test procedures - Fibre proof
test
IEC 60793-1-31 -  Optical fibres - Part 1-31: Measurement EN 60793-1-31 -
methods and test procedures - Tensile
strength
IEC 60793-1-32 -  Optical fibres - Part 1-32: Measurement EN IEC 60793-1-32 -
methods and test procedures - Coating
strippability
IEC 60793-1-33 -  Optical fibres - Part 1-33: Measurement EN 60793-1-33 -
methods and test procedures - Stress
corrosion susceptibility
IEC 60793-1-34 -  Optical fibres - Part 1-34: Measurement EN 60793-1-34 -
methods and test procedures - Fibre curl
IEC 60793-1-40 -  Optical fibres - Part 1-40: Measurement EN 60793-1-40 -
methods and test procedures - Attenuation
IEC 60793-1-42 -  Optical fibres - Part 1-42: Measurement EN 60793-1-42 -
methods and test procedures - Chromatic
dispersion
3

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SIST EN IEC 60793-2-50:2019
EN IEC 60793-2-50:2019 (E)
IEC 60793-1-44 -  Optical fibres - Part 1-44: Measurement EN 60793-1-44 -
methods and test procedures - Cut-off
wavelength
IEC 60793-1-45 -  Optical fibres - Part 1-45: Measurement EN IEC 60793-1-45 -
methods and test procedures - Mode field
diameter
IEC 60793-1-46 -  Optical fibres - Part 1-46: Measurement EN 60793-1-46 -
methods and test procedures - Monitoring
of changes in optical transmittance
IEC 60793-1-47 -  Optical fibres - Part 1-47: Measurement EN IEC 60793-1-47 -
methods and test procedures -
Macrobending loss
IEC 60793-1-48 -  Optical fibres - Part 1-48: Measurement EN 60793-1-48 -
methods and test procedures - Polarization
mode Dispersion
IEC 60793-1-50 -  Optical fibres - Part 1-50: Measurement EN 60793-1-50 -
methods and test procedures - Damp heat
(steady state) tests
IEC 60793-1-51 -  Optical fibres - Part 1-51: Measurement EN 60793-1-51 -
methods and test procedures - Dry heat
(steady state) tests
IEC 60793-1-52 -  Optical fibres - Part 1-52: Measurement EN 60793-1-52 -
methods and test procedures - Change of
temperature tests
IEC 60793-1-53 -  Optical fibres - Part 1-53: Measurement EN 60793-1-53 -
methods and test procedures - Water
immersion tests
IEC 60793-2 -  Optical fibres - Part 2: Product EN 60793-2 -
specifications - General
IEC 60794-2 -  Optical fibre cables - Part 2: Indoor cables EN 60794-2 -
- Sectional specification


4

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SIST EN IEC 60793-2-50:2019




IEC 60793-2-50

®


Edition 6.0 2018-12




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Optical fibres –

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

mode fibres




Fibres optiques –

Partie 2-50: Spécifications de produits – Spécification intermédiaire pour les


fibres unimodales de classe B













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.10 ISBN 978-2-8322-6280-1




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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60793-2-50:2019
– 2 – IEC 60793-2-50:2018 © IEC 2018
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviated terms and symbols . 10
5 Specifications . 10
5.1 General . 10
5.2 Dimensional requirements . 10
5.3 Mechanical requirements . 11
5.4 Transmission requirements . 12
5.5 Environmental requirements . 13
5.5.1 General . 13
5.5.2 Optical environmental requirements – Attenuation . 14
5.5.3 Mechanical environmental requirements . 14
Annex A (normative) Family specification for category B-652 Dispersion unshifted
single-mode fibres . 16
A.1 General . 16
A.2 Dimensional requirements . 16
A.3 Mechanical requirements . 17
A.4 Transmission requirements . 17
A.5 Hydrogen ageing for sub-category B-652.D . 19
A.6 Environmental requirements . 19
Annex B (normative) Family specification for category B-653 Dispersion shifted
single-mode fibres . 20
B.1 General . 20
B.2 Dimensional requirements . 20
B.3 Transmission requirements . 21
B.3.1 General . 21
B.3.2 Chromatic dispersion coefficient requirement for sub-category B-653.A
fibres . 21
B.3.3 Chromatic dispersion coefficient requirement for sub-category B-653.B
fibres . 22
B.4 Environmental requirements . 22
Annex C (normative) Family specification for category B-654 cut-off shifted single-
mode fibres . 23
C.1 General . 23
C.2 Dimensional requirements . 23
C.3 Mechanical requirements . 23
C.4 Chromatic dispersion parameters for B-654.E fibres . 25
C.5 Environmental requirements . 25
Annex D (normative) Family specification for category B-655 non-zero dispersion
shifted single-mode fibres . 26
D.1 General . 26
D.2 Dimensional requirements . 26
D.3 Mechanical requirements . 26
D.4 Transmission requirements . 27
D.4.1 General . 27

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SIST EN IEC 60793-2-50:2019
IEC 60793-2-50:2018 © IEC 2018 – 3 –
D.4.2 Chromatic dispersion coefficient limits for sub-category B-655.C fibres. 27
D.4.3 Chromatic dispersion coefficient limits for sub-category B-655.D fibres. 28
D.4.4 Chromatic dispersion coefficient limits for sub-category B-655.E fibres . 28
D.5 Environmental requirements . 28
Annex E (normative) Family specification for category B-656 Wideband non-zero

dispersion shifted single-mode fibres . 29
E.1 General . 29
E.2 Dimensional requirements . 29
E.3 Mechanical requirements . 29
E.4 Transmission requirements . 30
E.4.1 General . 30
E.4.2 Chromatic dispersion coefficient for category B-656 fibres . 30
E.5 Environmental requirements . 31
Annex F (normative) Family specification for category B-657 Bending loss insensitive
single-mode fibres . 32
F.1 General . 32
F.2 Dimensional requirements . 32
F.3 Mechanical requirements . 33
F.4 Transmission requirements . 33
F.5 Environmental requirements . 35
Annex G (informative) System design information for category B-655 non-zero
disperion shifted single-mode fibres . 36
G.1 General . 36
G.2 One standard deviation limits for sub-category B-655.D fibres . 36
G.3 One standard deviation limits for sub-category B-655.E fibres. 37
Bibliography . 39

Figure G.1 – Sub-category B-655.D chromatic dispersion coefficient limits . 37
Figure G.2 – Sub-category B-655.E chromatic dispersion coefficient limits . 38

Table 1 – Map of IEC designation to ITU-T Recommendations and IEC 60793-2-

50:2015 designation. 8
Table 2 – Dimensional attributes and measurement methods . 11
Table 3 – Dimensional requirements common to all category B fibres . 11
Table 4 – Mechanical attributes and test methods . 11
Table 5 – Mechanical requirements common to all class B fibres . 12
Table 6 – Transmission attributes and measurement methods . 12
Table 7 – Transmission, requirements common to all class B fibres . 13
Table 8 – Additional transmission attributes required in the family specifications . 13
Table 9 – Environmental exposure tests . 13
Table 10 – Attributes measured in environmental exposure tests . 13
Table 11 – Change in attenuation for environmental tests . 14
Table 12 – Coating strip force for environmental tests . 14
Table 13 – Tensile strength for environmental tests . 15
Table 14 – Stress corrosion susceptibility for environmental tests . 15
Table A.1 – Dimensional requirements specific to category B-652.B fibres. 16
Table A.2 – Dimensional requirements specific to category B-652.D fibres . 17

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SIST EN IEC 60793-2-50:2019
– 4 – IEC 60793-2-50:2018 © IEC 2018
Table A.3 – Mechanical requirements specific to category B-652 fibres . 17
Table A.4 – Transmission requirements specific to sub-category B-652.B fibres . 18
Table A.5 – Transmission requirements specific to sub-category B-652.D Fibres . 18
Table A.6 – Chromatic dispersion properties for sub-category B-652.D fibres . 19
Table B.1 – Dimensional requirements specific to category B-653 fibres . 20
Table B.2 – Mechanical requirements specific to category B-653 fibres . 21
Table B.3 – Transmission requirements specific to category B-653 fibres . 21
Table C.1 – Dimensional requirements specific to category B-654 fibres . 23
Table C.2 – Mechanical requirements specific to category B-654 fibres . 24
Table C.3 – Transmission requirements specific to category B-654 fibres . 24
Table D.1 – Dimensional requirements specific to category B-655 fibres . 26
Table D.2 – Mechanical requirements specific to category B-655 fibres . 27
Table D.3 – Transmission requirements specific to category B-655 fibres . 27
Table E.1 – Dimensional requirements specific to category B-656 fibres . 29
Table E.2 – Mechanical requirements specific to category B-656 fibres . 30
Table E.3 – Transmission requirements specific to category B-656 fibres . 30
Table F.1 – Dimensional requirements specific to category B-657 fibres . 33
Table F.2 – Mechanical requirements specific to category B-657 fibres . 33
Table F.3 – Transmission requirements specific to category B-657 fibres . 34
Table G.1 – Examples for λ = 1 530 nm and λ = 1 565 nm . 36
min max

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SIST EN IEC 60793-2-50:2019
IEC 60793-2-50:2018 © IEC 2018 – 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.
The sixth edition cancels and replaces the fifth edition published in 2015. This edition
constitutes a technical revision. This edition includes the following significant technical
changes with respect to the previous edition:
a) Introduction of a revised naming convention which better matches with those found in
ITU-T Recommendations G.652, G.653, G.654, G.655, G.656, and G.657. These changes
are outlined in the scope of this document along with a cross reference table for the new
names. Annexes have been rearranged to improve clarity based on the new naming;
b) Further details on the requirements for 200 micron coated single-mode fibre;
c) Harmonization with the following ITU-T Recommendations published in November 2016:
G.652, G.654, G.657 including revised chromatic dispersion specifications, new categories
and new application spaces for these fibre categories;

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SIST EN IEC 60793-2-50:2019
– 6 – IEC 60793-2-50:2018 © IEC 2018
d) Descriptions of fibre types have been added to the titles of Annexes A to F.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1884/FDIS 86A/1898/RVD

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 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 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 document using a
colour printer.

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SIST EN IEC 60793-2-50:2019
IEC 60793-2-50:2018 © IEC 2018 – 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 B-652, B-653, B-654, B-655,
B-656 and B-657. A map illustrating the connection of IEC designations to ITU-T designations
is shown in Table 1. 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 document
and which are given in Clause 5;
• particular requirements applicable to individual fibre categories or specific applications,
which are defined in Annexes A to F.
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.
Table 1 shows a map from the IEC designations to the ITU-T recommendations. The table
also provides the normative annex in this document that contains the detailed specification as
well as the name used to describe this fibre type in IEC 60793-2-50:2015. The ITU-T
recommendations as well as the IEC categories/sub-categories within each recommendation
are given. In some cases, as for Recommendation G.652, a given IEC designation maps to
multiple categories in the ITU-T because the ITU-T catego
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