kSIST FprEN IEC 61754-2:2026

Fibre optic connector interfaces - Part 2: Type BFOC/2,5 connector family

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.

Steckgesichter von Lichtwellenleiter-Steckverbindern – Teil 2: Bauart BFOC/2,5 Steckverbinderfamilie

Interfaces de connecteurs fibroniques - Partie 2: Famille de connecteurs de type BFOC/2,5

L'IEC 61754-2:2026 définit les dimensions d'interface normalisées pour la famille de connecteurs de type BFOC/2,5.
Cette deuxième édition annule et remplace la première édition parue en 1996. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques significatives suivantes par rapport à l'édition précédente:
a) ajout de l'Article 2, de l'Article 3 et de la Bibliographie;
b) ajout du type d'interface d'embase d'un dispositif actif;
c) révision des classes de férules pour faire référence aux interfaces optiques de connecteurs spécifiées dans la série IEC 61755-3;
d) révision de la géométrie de l'extrémité de la férule pour faire référence aux interfaces optiques de connecteurs spécifiées dans la série IEC 61755‑3 et dans la série IEC 63267‑3;
e) amélioration de la description des caractéristiques du manchon d'alignement élastique pour le raccord et du manchon creux rigide pour l'embase d'un dispositif actif;
f) harmonisation des dimensions de la référence A pour le manchon creux rigide par rapport aux autres normes d'interfaces de connecteurs de la série IEC 61754.

Vmesniki za optične konektorje - 2. del: Družina konektorjev tipa BFOC/2,5

General Information

• Status: Not Published
• Public Enquiry End Date: 31-Jul-2025
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 04-Feb-2026
• Due Date: 25-Mar-2026
• Completion Date: 05-Feb-2026
• Ref Project: FprEN IEC 61754-2:2026 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 2: Type BFOC/2,5 connector family

Relations

• Revises: SIST EN 61754-2:1997 - Fibre optic connector interfaces -- Part 2: Type BFOC/2,5 connector family
• Effective Date: 14-Jan-2025

Overview

kSIST FprEN IEC 61754-2:2026 (published by CLC) specifies the standard interface dimensions for the BFOC/2,5 fibre optic connector family. This international standard enables uniformity and compatibility in fibre optic interconnecting devices and passive components through clear dimensional definitions for connectors, adaptors, and active device receptacle interfaces. The 2026 edition supersedes the 1996 version, introducing technical revisions and harmonization with the latest interface and geometrical requirements.

By formalizing the physical interfaces for BFOC/2,5 connectors, this standard supports the delivery of reliable, high-performance fibre optic networks. It is essential for manufacturers, installers, and system integrators seeking to ensure interoperability and quality across diverse applications.

Key Topics

• Connector Interface Standardization:

  • Specifies interface dimensions for plug, adaptor, and active device receptacle in the BFOC/2,5 connector family.
  • Incorporates interface definitions compatible with physically contacting ferrule designs.

• Technical Updates in the 2026 Edition:

  • Addition of clauses for terms, normative references, and bibliography.
  • Introduction of the active device receptacle interface type.
  • Revised ferrule grades and end face geometry, referencing IEC 61755-3 and IEC 63267-3 series for alignment with current fibre optic connector performance requirements.
  • Improved characterization of resilient alignment sleeves for adaptors and rigid bore sleeves for active device receptacles.
  • Harmonization of rigid bore sleeve dimensions to align with other IEC 61754 connector interface standards.

• Reference Alignment:

  • Integrates relevant parts of IEC 61755-3 (single-mode) and IEC 63267-3 (multimode) for connector optical interface parameters, ensuring contemporary compatibility.
  • Defines procedures and requirements for adaptor and pin gauge use.

Applications

The BFOC/2,5 connector interface standard is widely applicable in:

• Telecommunications networks: Ensures reliable and interoperable fibre optic connections for backbone, access, and distribution networks.
• Data centres and enterprise networks: Standardizes physical interfaces for fibre links connecting switches, servers, and storage devices.
• Industrial automation: Supports robust plug-and-play fibre connectivity in industrial environments.
• Test & measurement setups: Offers consistent connectors and adaptors for fibre optic instruments and calibration equipment.
• Equipment manufacturing: Provides essential dimensional data for designing compatible optical transceivers, adaptors, and cabling assemblies.

Adhering to IEC 61754-2:2026 ensures equipment interoperability, optimal optical performance, and future-proofed network expansion.

Related Standards

For full compliance and optimal system design, consider the following closely associated fibre optic connector standards:

• IEC 61754-1: General requirements and guidance for fibre optic connector interfaces.
• IEC 61755-3 series: Defines connector optical interface parameters for single-mode physically contacting fibres.
• IEC 63267-3 series: Connectors for enhanced macrobend multimode fibres, focusing on 50 μm core diameter physically contacting interfaces.
• IEC 61300-3-22: Test methods for ferrule compression force.
• IEC 61300-3-33: Test methods for withdrawal force from resilient alignment sleeves.

These standards collectively ensure high precision, reliable mating, and compatibility across fibre optic connector products and systems.

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By establishing unified connector interface dimensions for the BFOC/2,5 family, kSIST FprEN IEC 61754-2:2026 is a foundational reference for fibre optic interconnection quality, interoperability, and long-term infrastructure resilience. Use this standard to guide design, selection, and installation of compatible fibre optic devices in a wide range of communication and data systems.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN IEC 61754-2:2025
01-julij-2025
Vmesniki za optične konektorje - 2. del: Družina konektorjev vrste BFOC/2,5
Fibre optic connector interfaces - Part 2: Type BFOC/2,5 connector family
Interfaces de connecteurs fibroniques - Partie 2: Famille de connecteurs de type
BFOC/2,5
Ta slovenski standard je istoveten z: prEN IEC 61754-2:2025
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
oSIST prEN IEC 61754-2:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 61754-2:2025
oSIST prEN IEC 61754-2:2025
86B/5057/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61754-2 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-06-13 2025-09-05
SUPERSEDES DOCUMENTS:
86B/4991/CD, 86B/5021A/CC
IEC SC 86B : FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
SECRETARIAT: SECRETARY:
Japan Mr Ryo Koyama
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Fibre optic connector interfaces - Part 2: Type BFOC/2,5 connector family
PROPOSED STABILITY DATE: 2032
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
for any other purpose without permission in writing from IEC.

oSIST prEN IEC 61754-2:2025
2 IEC CDV 61754-2 ED2 © IEC 2025
1 CONTENTS
3 FOREWORD . 3
4 1 Scope . 5
5 2 Normative references . 5
6 3 Terms and definitions . 5
7 4 General . 5
8 5 Interfaces . 5
9 Bibliography . 12
11 Figure 1 –Connector plug interface . 6
12 Figure 2 – Connector plug ferrule end-face . 8
13 Figure 3 – Connector adaptor interface . 9
14 Figure 4 – Pin gauge for the connector adaptor . 11
16 Table 1 – Duration of DUT conditioning at specified temperature . 6
17 Table 2 – Connector plug interface dimensions . 7
18 Table 3 – Ferrule grade for the connector plug . 8
19 Table 4 – Connector plug ferrule end-face dimensions . 8
20 Table 5 – Connector interface dimensions . 10
21 Table 6 – Alignment sleeve grades for connector adaptor and active device receptacle
22 interface . 10
23 Table 7 – Dimensions of the pin gauge for the connector adaptor . 11
oSIST prEN IEC 61754-2:2025
IEC CDV 61754-2 ED2 © IEC 2025 3
26 INTERNATIONAL ELECTROTECHNICAL COMMISSION
27 ____________
29 FIBRE OPTIC INTERCONNECTING
30 DEVICES AND PASSIVE COMPONENTS –
31 FIBRE OPTIC CONNECTOR INTERFACES –
33 Part 2: Type BFOC/2,5 connector family
35 FOREWORD
36 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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65 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
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67 International Standard IEC 61754-2 has been prepared by subcommittee 86B: Fibre optic
68 interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
69 This second edition cancels and replaces the first edition published in 1996. This edition
70 includes the following significant technical changes with respect to the previous edition:
71 a) Added clauses and content for Terms and definitions, Normative references, Bibliography;
72 b) Added the active device receptacle interface type;
73 c) Changed the ferrule grades to referring to the connector optical interface standard IEC
74 61755-3 series;
75 d) Changed the ferrule end face geometry to the reference to the connector optical interface
76 standard IEC 61755-3 series and IEC 63267-3 series;
77 e) Improved the description of the characteristics of the resilient alignment sleeve for adaptor
78 and rigid bore sleeve for active device receptacle;
79 f) Harmonised the dimensions of the reference A for the rigid bore sleeve with other connector
80 interface standards in IEC 61754 series.

oSIST prEN IEC 61754-2:2025
4 IEC CDV 61754-2 ED2 © IEC 2025
81 The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/XX/FDIS 86B/XX/RVD
83 Full information on the voting for the approval
...