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)
- 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
SIST EN IEC 61754-2:2026 is a CENELEC European Standard that defines the standard interface dimensions for the Type BFOC/2,5 fibre optic connector family. It is meant for connector designers, manufacturers, assemblers, and test laboratories that need plugs, adaptors, and active device receptacles to mate to the same geometry.
What does SIST EN IEC 61754-2:2026 specify?
SIST EN IEC 61754-2:2026 specifies the interface dimensions for the BFOC/2,5 connector family and the associated geometry used to check intermateability. The document is organised into five clauses, a bibliography, and Annex ZA, which maps the normative references to European publications.
| Interface reference | What it covers |
|---|---|
| IEC 61754-2-1 | Connector plug interface |
| IEC 61754-2-2 | Adaptor interface |
| IEC 61754-2-3 | Active device receptacle interface |
Clause 1 gives the scope, Clause 2 lists the normative references, Clause 3 points to the applicable terms and definitions, Clause 4 describes the parent connector, and Clause 5 sets the interface requirements.
What are the key requirements of SIST EN IEC 61754-2:2026?
SIST EN IEC 61754-2:2026 standardizes the connector family around one parent form and three interface types. In practice, that means a designer can specify one geometry for mating parts instead of treating each supplier’s parts as unique.
Parent connector and plug interface
Clause 4 defines the parent connector as a single-position connector plug with a 2,5 mm nominal ferrule diameter, a bayonet coupling nut, a spring-loaded ferrule, and a single male guide key. That combination controls orientation, rotation, and axial mating behaviour.
Clause 5 and Table 2 define the connector plug interface dimensions, while Table 3 assigns ferrule grades and Table 4 defines the ferrule end-face geometry. The plug ferrule has a spherically polished end-face and achieves physical contact (PC), so the optical faces are intended to touch when mated.
Table 2 also sets practical checks on the plug, including coupling-ring float, free rotation, and ferrule force limits linked to IEC 61300-3-22. For users, this means the plug is not just shaped correctly - its moving parts and compression behaviour are part of the interface control.
Adaptor and active device receptacle
Clause 5 specifies the adaptor interface in IEC 61754-2-2 and the active device receptacle interface in IEC 61754-2-3. Table 5 gives the adaptor dimensions, and Table 6 sets the alignment sleeve grades for both the adaptor and the active device receptacle.
The adaptor uses a resilient alignment sleeve, checked with a pin gauge according to IEC 61300-3-33 and with a specified insertion force range. The active device receptacle uses a rigid bore sleeve with graded reference A limits. In practice, this is how production and incoming inspection confirm that the mating bore will align the connector repeatably.
Optical-interface grades and gauge checks
Table 3 links the plug ferrule grades to the connector optical interfaces in the IEC 61755-3 series and the IEC 63267-3 series. Table 4 then ties the ferrule end-face dimensions to those same optical-interface families. This matters when specifying the optical build of the connector, not just its outer shape.
Table 7 defines the pin gauge for the adaptor, including its dimensional and surface-quality requirements. That gives laboratories and toolmakers a common gauge reference for verifying the sleeve fit during testing and production control.
What terms does SIST EN IEC 61754-2:2026 define?
- BFOC/2,5 - the connector family covered by this part, identified by a 2,5 mm nominal ferrule diameter and a bayonet coupling nut.
- Physical contact (PC) - a ferrule arrangement with a spherically polished end-face so the optical faces touch when mated.
- Ferrule grade - the grade number used to link a plug interface to the optical interface families in IEC 61755-3 or IEC 63267-3.
- Adaptor - the mating interface that uses a resilient alignment sleeve to guide the connector into position.
- Active device receptacle - the interface used at an active device side, where the alignment feature is a rigid bore sleeve.
- Device under test (DUT) - the item being conditioned or measured in the referenced test procedures.
- Pin gauge - the inspection tool used to check sleeve fit and alignment in the adaptor interface.
Who uses SIST EN IEC 61754-2:2026?
SIST EN IEC 61754-2:2026 is used by fibre optic connector manufacturers, cable assembly suppliers, and component designers who need the BFOC/2,5 interface to mate correctly. Test laboratories use it when checking dimensions, pin-gauge fit, ferrule force, and intermateability.
Quality managers and buyers use it when writing purchase specifications, inspection plans, and acceptance criteria for optical interconnect parts. It is relevant in fibre optic interconnecting devices and passive components, especially where standardized connector interfaces are required.
What changed in SIST EN IEC 61754-2:2026 from the previous edition?
SIST EN IEC 61754-2:2026 cancels and replaces the first edition published in 1996, and it is a technical revision. The stated changes are:
- addition of Clause 2, Clause 3, and the Bibliography
- addition of the active device receptacle interface type
- revision of ferrule grades to refer to the IEC 61755-3 series
- revision of ferrule end-face geometry to refer to the IEC 61755-3 series and IEC 63267-3 series
- improved description of the resilient alignment sleeve for the adaptor and the rigid bore sleeve for the active device receptacle
- harmonisation of the rigid bore sleeve reference A dimensions with other IEC 61754 series interface standards
Which standards are used with SIST EN IEC 61754-2:2026?
SIST EN IEC 61754-2:2026 relies on these referenced standards for terms, test methods, and optical-interface definitions:
- IEC 61300-3-33 - gives the pin-gauge method used to check withdrawal force from a resilient alignment sleeve
- IEC 61754-1 - provides the general rules and terms for fibre optic connector interfaces
- IEC 61755-3 series - defines connector optical interfaces used for plug ferrule grades and end-face geometry
- IEC 63267-3 series - defines connector optical interfaces used for the revised ferrule end-face geometry
- IEC 61300-3-22 - is cited in the bibliography note for ferrule compression force
What does the SIST EN IEC 61754-2:2026 document contain?
SIST EN IEC 61754-2:2026 contains four figures and seven tables that turn the interface rules into inspectable geometry. Figure 1 shows the connector plug interface, Figure 2 the plug ferrule end-face, Figure 3 the adaptor interface, and Figure 4 the adaptor pin gauge.
The tables cover the interface dimensions, ferrule grades, ferrule end-face dimensions, adaptor dimensions, sleeve grades, and pin-gauge dimensions. This makes the document useful for design control, dimensional inspection, gauge verification, and interface qualification.
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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