SIST EN IEC 61754-2:2026
(Main)Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 2: Type BFOC/2,5 connector family (IEC 61754-2:2026)
General Information
- Abstract
IEC 61754-2: 2026 defines the standard interface dimensions for type BFOC/2,5 family of connectors.
This second edition cancels and replaces the first edition published in 1996. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of Clause 2, Clause 3 and the Bibliography;
b) addition of the active device receptacle interface type;
c) revision of the ferrule grades to refer to the connector optical interfaces specified in the IEC 61755-3 series;
d) revision of the ferrule end face geometry to refer to the connector optical interfaces specified in the IEC 61755‑3 series and IEC 63267‑3 series;
e) improvement of the description of the characteristics of the resilient alignment sleeve for adaptor and rigid bore sleeve for active device receptacle;
f) harmonisation of the dimensions of reference A for the rigid bore sleeve with other connector interface standards in IEC 61754 series.
- Status
- Published
- Public Enquiry End Date
- 31-Jul-2025
- Publication Date
- 21-Jul-2026
- Technical Committee
- MOC - Mobile Communications
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 30-Jun-2026
- Due Date
- 04-Sep-2026
- Completion Date
- 22-Jul-2026
Overview
SIST EN IEC 61754-2:2026 establishes the standardized interface dimensions for the BFOC/2,5 family of fibre optic connectors. This standard, developed by the International Electrotechnical Commission (IEC) and adopted by the Slovenian Institute for Standardization (SIST), ensures compatibility and interoperability between fibre optic interconnection devices and passive components using the BFOC/2,5 connector type. The 2026 edition supersedes the previous 1996 version, bringing several notable technical updates in line with evolving optical network requirements.
Standardization of fibre optic connector interfaces is crucial in the design and deployment of reliable fibre optic communication systems. By precisely defining connector interfaces, the standard enables manufacturers, installers, and operators to achieve consistent quality, performance, and compatibility across diverse applications and geographies.
Key Topics
- BFOC/2,5 Connector Family: Focus on connectors with a 2.5 mm nominal ferrule diameter, bayonet coupling mechanism, and spring-loaded ferrule design to ensure physical contact.
- Interface Types: Includes specifications for connector plug interfaces, adaptor interfaces, and active device receptacle interfaces.
- Ferrule Grades and Geometry: Revises ferrule specifications to reference the latest connector optical interface standards (IEC 61755-3 series and IEC 63267-3 series).
- Alignment Sleeves: Details on resilient alignment sleeve for adaptors and rigid bore sleeve for active device receptacles, enhancing mechanical alignment and optical performance.
- Dimensional Harmony: Coordinates reference dimensions for the rigid bore sleeve with other IEC 61754 connector interfaces to ensure consistency.
- Expanded Content: Incorporates new clauses on terminology, normative references, and bibliography to support correct usage and further study.
Applications
SIST EN IEC 61754-2:2026 is essential for:
- Fiber Optic Network Design: Ensuring compatibility of connectors across transmission equipment, patch panels, and network infrastructure.
- Manufacturing: Providing manufacturers with precise interface requirements to produce interoperable BFOC/2,5 connectors and related components.
- Quality Assurance: Facilitating standardized testing and inspection procedures, leading to reliable field performance and simplified procurement.
- Active Device Integration: Supporting interfaces for active devices (such as transceivers) through updated receptacle specifications, broadening the range of components that can be standardized.
- Installation and Maintenance: Assisting installers and technicians in selecting and correctly mating fibre optic connectors, reducing network downtime and maintenance costs.
Typical use cases include telecommunications, data centers, industrial networking, and any environment where standardized fibre optic interconnections are required for robust high-speed data transmission.
Related Standards
For comprehensive understanding and application, the following standards are referenced directly in SIST EN IEC 61754-2:2026 or provide complementary requirements:
- IEC 61754-1: General guidance for fibre optic connector interfaces.
- IEC 61755-3 Series: Parameters for connector optical interfaces, specifically for dispersion unshifted single-mode physically contacting fibres.
- IEC 63267-3 Series: Connector optical interface parameters for enhanced macro bend multimode fibres (e.g., 50 µm core diameter).
- IEC 61300-3-22: Test and measurement procedures for ferrule compression force.
- IEC 61300-3-33: Measurement of withdrawal force from resilient alignment sleeves using pin gauges.
Practical Value
Adhering to SIST EN IEC 61754-2:2026 enables the deployment of interoperable, reliable fibre optic networks and supports seamless integration of BFOC/2,5 connectors worldwide. Standardized interfaces enhance product compatibility, simplify supply chains, and ensure long-term performance in evolving optical communication networks. The publication's technical revisions further align with current international best practices and technology developments in fibre optic networks.
Keywords: fibre optic standard, BFOC/2,5 connector, IEC 61754-2:2026, connector interface, passive components, optical networks, connector interoperability.
Relations
- Replaces
SIST EN 61754-2:1997 - Fibre optic connector interfaces -- Part 2: Type BFOC/2,5 connector family - Effective Date
- 01-Sep-2026
- Effective Date
- 26-May-2026
- Effective Date
- 26-May-2026
- Effective Date
- 26-May-2026
- Effective Date
- 26-May-2026
- Effective Date
- 26-May-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
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Frequently Asked Questions
SIST EN IEC 61754-2:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 2: Type BFOC/2,5 connector family (IEC 61754-2:2026)". This standard covers: IEC 61754-2: 2026 defines the standard interface dimensions for type BFOC/2,5 family of connectors. This second edition cancels and replaces the first edition published in 1996. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) addition of Clause 2, Clause 3 and the Bibliography; b) addition of the active device receptacle interface type; c) revision of the ferrule grades to refer to the connector optical interfaces specified in the IEC 61755-3 series; d) revision of the ferrule end face geometry to refer to the connector optical interfaces specified in the IEC 61755‑3 series and IEC 63267‑3 series; e) improvement of the description of the characteristics of the resilient alignment sleeve for adaptor and rigid bore sleeve for active device receptacle; f) harmonisation of the dimensions of reference A for the rigid bore sleeve with other connector interface standards in IEC 61754 series.
IEC 61754-2: 2026 defines the standard interface dimensions for type BFOC/2,5 family of connectors. This second edition cancels and replaces the first edition published in 1996. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) addition of Clause 2, Clause 3 and the Bibliography; b) addition of the active device receptacle interface type; c) revision of the ferrule grades to refer to the connector optical interfaces specified in the IEC 61755-3 series; d) revision of the ferrule end face geometry to refer to the connector optical interfaces specified in the IEC 61755‑3 series and IEC 63267‑3 series; e) improvement of the description of the characteristics of the resilient alignment sleeve for adaptor and rigid bore sleeve for active device receptacle; f) harmonisation of the dimensions of reference A for the rigid bore sleeve with other connector interface standards in IEC 61754 series.
SIST EN IEC 61754-2:2026 is classified under the following ICS (International Classification for Standards) categories: 33.180.20 - Fibre optic interconnecting devices. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 61754-2:2026 has the following relationships with other standards: It is inter standard links to SIST EN 61754-2:1997, SIST EN 61754-1:2014, SIST EN IEC 61755-3-1:2024, SIST EN IEC 61300-3-33:2022, oSIST prEN IEC 63267-3-1:2026, SIST EN IEC 61755-3-2:2024, SIST EN IEC 61158-2:2024, SIST EN IEC 61918:2019, SIST EN 61158-2:2015, SIST EN 61918:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 61754-2:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN 61754-2:1997
Optični spojni elementi in pasivne komponente - Vmesniki za optične konektorje -
2. del: Družina konektorjev tipa BFOC/2,5 (IEC 61754-2:2026)
Fibre optic interconnecting devices and passive components - Fibre optic connector
interfaces - Part 2: Type BFOC/2,5 connector family (IEC 61754-2:2026)
Steckgesichter von Lichtwellenleiter-Steckverbindern - Teil 2: Bauart BFOC/2,5
Steckverbinderfamilie (IEC 61754-2:2026)
Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces de
connecteurs fibroniques - Partie 2: Famille de connecteurs de type BFOC/2,5 (IEC
61754-2:2026)
Ta slovenski standard je istoveten z: EN IEC 61754-2:2026
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61754-2
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2026
ICS 33.180.20 Supersedes EN 61754-2:1997
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic connector interfaces - Part 2: Type BFOC/2,5
connector family
(IEC 61754-2:2026)
Dispositifs d'interconnexion et composants passifs Steckgesichter von Lichtwellenleiter-Steckverbindern - Teil
fibroniques - Interfaces de connecteurs fibroniques - Partie 2: Bauart BFOC/2,5 Steckverbinderfamilie
2: Famille de connecteurs de type BFOC/2,5 (IEC 61754-2:2026)
(IEC 61754-2:2026)
This European Standard was approved by CENELEC on 2026-05-22. 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
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61754-2:2026 E
European foreword
The text of document 86B/5195/FDIS, future edition 2 of IEC 61754-2, prepared by SC 86B "Fibre
optic interconnecting devices and passive components" of IEC/TC 86 "Fibre optics" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61754-2:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-06-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-06-30
document have to be withdrawn
This document supersedes EN 61754-2:1997 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 61754-2:2026 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 61300-3-22 NOTE Approved as EN 61300-3-22
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 61300-3-33 - Fibre optic interconnecting devices and EN IEC 61300-3-33 -
passive components - Basic test and
measurement procedures - Part 3-33:
Examinations and measurements -
Withdrawal force from a resilient alignment
sleeve using pin gauges
IEC 61754-1 - Fibre optic interconnecting devices and EN 61754-1 -
passive components - Fibre optic
connector interfaces - Part 1: General and
guidance
IEC 61755-3 series Fibre optic connector optical interfaces - - series
Part 3-1: Optical interface, 2,5 mm and
1,25 mm diameter cylindrical full zirconia
PC ferrule, single mode fibre
IEC 63267-3 series Fibre optic interconnecting devices and - series
passive components - Connector optical
interfaces for enhanced macrobend
multimode fibres - Part 3-1: Connector
parameters of physically contacting 50 µm
core diameter fibres - Non-angled 2,5 mm
and 1,25 mm diameter cylindrical full
zirconia ferrules
IEC 61754-2 ®
Edition 2.0 2026-04
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components - Fibre optic
connector interfaces -
Part 2: Type BFOC/2,5 connector family
ICS 33.180.20 ISBN 978-2-8327-1186-6
IEC 61754-2:2026-04(en)
IEC 61754-2:2026 © IEC 2026
CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 General . 4
5 Interfaces . 4
Bibliography . 11
Figure 1 –Connector plug interface . 5
Figure 2 – Connector plug ferrule end-face . 7
Figure 3 – Adaptor interface . 8
Figure 4 – Pin gauge for the adaptor . 10
Table 1 – Duration of DUT conditioning at specified temperature . 5
Table 2 – Connector plug interface dimensions . 6
Table 3 – Ferrule grade for the connector plug . 6
Table 4 – Connector plug ferrule end-face dimensions . 7
Table 5 – Adaptor interface dimensions . 9
Table 6 – Alignment sleeve grades for adaptor and active device receptacle interface . 9
Table 7 – Dimensions of the pin gauge for the adaptor . 10
IEC 61754-2:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Fibre optic interconnecting devices and passive components -
Fibre optic connector interfaces -
Part 2: Type BFOC/2,5 connector family
FOREWORD
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