SIST EN IEC 60793-2-50:2025

Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2025)

IEC 60793-2-50:2025 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 4;
- particular requirements applicable to individual fibre categories or specific applications, which are defined in Annex A to Annex 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.
This seventh edition cancels and replaces the sixth edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition.
a) The addition of a 200 µm coating nominal outer diameter option for B-654A, B, C fibres in Annex C

Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für Einmodenfasern der Kategorie B (IEC 60793-2-50:2025)

Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B (IEC 60793-2-50:2025)

L'IEC 60793-2-50:2025 La présente partie de l’IEC 60793 est applicable aux fibres optiques des catégories B-652, B‑653, B-654, B-655, B‑656 et B-657. Une table de correspondance entre les désignations IEC et les désignations UIT-T est représentée dans le Tableau 1. Ces fibres sont utilisées ou peuvent être intégrées dans des équipements destinés à 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 le présent document, et qui sont données dans l’Article 4;
- des exigences particulières applicables à des catégories particulières de fibres ou à des applications spécifiques, qui sont définies de l’Annexe A à l’Annexe F.
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. Le Tableau 1 représente une table de correspondance entre les désignations IEC et les recommandations de l’UIT-T.
Cette septième édition annule et remplace la sixième édition parue en 2018. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d’une option de diamètre extérieur nominal de revêtement de 200 µm pour les fibres B-654A, B, C dans l’Annexe C

Optična vlakna - 2-50. del: Specifikacije izdelka - Področna specifikacija za enorodovna vlakna razreda B (IEC 60793-2-50:2025)

General Information

• Status: Published
• Public Enquiry End Date: 22-Jun-2023
• Publication Date: 17-Jul-2025
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Jun-2025
• Due Date: 29-Aug-2025
• Completion Date: 18-Jul-2025
• Ref Project: EN IEC 60793-2-50:2025 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres

Relations

• Replaces: 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: 01-Sep-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN IEC 60793-2-50:2019
Optična vlakna - 2-50. del: Specifikacije izdelka - Področna specifikacija za
enorodovna vlakna razreda B (IEC 60793-2-50:2025)
Optical fibres - Part 2-50: Product specifications - Sectional specification for class B
single-mode fibres (IEC 60793-2-50:2025)
Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für
Einmodenfasern der Kategorie B (IEC 60793-2-50:2025)
Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire
pour les fibres unimodales de classe B (IEC 60793-2-50:2025)
Ta slovenski standard je istoveten z: EN IEC 60793-2-50:2025
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60793-2-50

NORME EUROPÉENNE
EUROPÄISCHE NORM June 2025
ICS 33.180.10 Supersedes EN IEC 60793-2-50:2019
English Version
Optical fibres - Part 2-50: Product specifications - Sectional
specification for class B single-mode fibres
(IEC 60793-2-50:2025)
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 60793-2-50:2025)
(IEC 60793-2-50:2025)
This European Standard was approved by CENELEC on 2025-06-12. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60793-2-50:2025 E

European foreword
The text of document 86A/2494/FDIS, future edition 7 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 60793-2-50:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-06-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-06-30
document have to be withdrawn
This document supersedes EN IEC 60793-2-50:2019 and all of its amendments and corrigenda (if
any).
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60793-2-50:2025 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 standard indicated:
IEC 60793-1-1 NOTE Approved as EN IEC 60793-1-1
IEC 60794-2 NOTE Approved as EN 60794-2
IEC 60794-3 NOTE Approved as EN IEC 60794-3
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60793-1 series Optical fibres EN IEC 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 IEC 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 IEC 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 IEC 60793-1-34 -
methods and test procedures - Fibre curl
IEC 60793-1-40 - Optical fibres - Part 1-40: Attenuation EN IEC 60793-1-40 -
measurement methods
IEC 60793-1-42 2013 Optical fibres - Part 1-42: Measurement EN 60793-1-42 2013
methods and test procedures -
Chromatic dispersion
IEC 60793-1-44 - Optical fibres - Part 1-44: Measurement EN IEC 60793-1-44 -
methods and test procedures - Cut-off
wavelength
Publication Year Title EN/HD Year
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 IEC 60793-1-46 -
methods and test procedures -
Monitoring of changes in attenuation
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 IEC 60793-2 -
specifications - General
IEC 60794-1-1 - Optical fibre cables - Part 1-1: Generic EN IEC 60794-1-1 -
specification - General
IEC 60793-2-50 ®
Edition 7.0 2025-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
ICS 33.180.10  ISBN 978-2-8327-0410-3

IEC 60793-2-50:2025-05(en-fr)
– 2 – IEC 60793-2-50:2025 © IEC 2025
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 8
3 Terms, definitions, abbreviated terms and symbols . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms and symbols . 9
4 Specifications . 10
4.1 General . 10
4.2 Dimensional requirements . 10
4.3 Mechanical requirements . 11
4.4 Transmission requirements . 12
4.5 Environmental requirements . 14
4.5.1 General . 14
4.5.2 Optical environmental requirements – Attenuation . 14
4.5.3 Mechanical environmental requirements . 15
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

IEC 60793-2-50:2025 © IEC 2025 – 3 –
D.4.1 General . 27
D.4.2 Chromatic dispersion coefficient limits for sub-category B-655.C fibres. 27
D.4.3 Chromatic dispersion
...