SIST EN IEC 61754-37:2026

Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 37: Type MDC connector family (IEC 61754-37:2025)

IEC 61754-37:2025 defines the standard mechanical interface dimensions for the type MDC family of connectors.

Lichtwellenleiter-Verbindungselemente und passive Bauteile - Steckgesichter von Lichtwellenleiter-Steckverbindern - Teil 37: Steckverbinderfamilie Typ MDC (IEC 61754-37:2025)

Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces de connecteurs fibroniques - Partie 37: Famille de connecteurs de type MDC (IEC 61754-37:2025)

IEC 61754-37:2025 définit les dimensions des interfaces mécaniques normales pour la famille de connecteurs de type MDC.

Optični spojni elementi in pasivne komponente - Vmesniki za optične konektorje - 37. del: Družina konektorjev vrste MDC (IEC 61754-37:2025)

General Information

• Status: Published
• Public Enquiry End Date: 31-Mar-2022
• Publication Date: 20-Nov-2025
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Nov-2025
• Due Date: 17-Jan-2026
• Completion Date: 21-Nov-2025
• Ref Project: EN IEC 61754-37:2025 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 37: Type MDC connector family

Overview

EN IEC 61754-37:2025 (identical to IEC 61754-37:2025) specifies the standard mechanical interface dimensions for the Type MDC connector family used in fibre optic interconnecting devices and passive components. The standard defines plug, adaptor and active-device receptacle interfaces for duplex and quadruplex arrangements, ensuring mechanical interoperability across vendors and equipment. It was approved by CENELEC in 2025 and is part of the IEC 61754 connector interfaces series.

Key topics

• Scope: Mechanical interface dimensions for the MDC connector family; not optical performance.
• Connector description:
  • Parent connector is a duplex plug/adaptor/plug set.
  • Uses two 1.25 mm nominal OD spring‑loaded ferrules.
  • Push–pull coupling latching mechanism for mating/unmating.
  • Optical alignment via resilient split sleeve.
• Standard interfaces defined:
  • 37-1: Duplex plug - Physical Contact (PC)
  • 37-2: Duplex plug - Angled Physical Contact (APC, 8°)
  • 37-3: Duplex adaptor interface
  • 37-4: Duplex active device receptacle interface
  • 37-5: Quadruplex adaptor interface
  • 37-6: Quadruplex active device receptacle interface
• Intermateability rules: APC plugs mate with APC receptacles; PC plugs mate with PC receptacles. Table and figures document plug-to-adaptor/receptacle compatibility.
• Annexes and technical detail:
  • Annex A: Additional adaptor dimensional information (reduced/full flange variants)
  • Annex B: Oriented fibre core location guidance
  • Annex C: MDC latch details
  • Includes pin gauge, dimensional tables and detailed figures for manufacturing and verification.

Applications

EN IEC 61754-37 is used wherever consistent mechanical mating of small-form‑factor fibre connectors is required:

• Design and manufacture of MDC connectors, adaptors and active device receptacles
• Development of optical transceivers, patch panels, and high‑density cabling modules
• Equipment integration in data centers, telecom central offices, enterprise networks and optical test gear
• Test labs and certification bodies performing mechanical compliance checks and intermateability testing

Who should use this standard

• Connector and cable manufacturers
• Optical module and active equipment designers
• System integrators and data centre operators specifying interoperable hardware
• Test labs and compliance engineers

Related standards

• IEC 61754-1 (general guidance for fibre optic connector interfaces)
• IEC 61755 series (connector optical interfaces - PC/APC ferrules)
• IEC 60794-2-50 (indoor cable family specs)
• IEC 63267 series (connector optical interfaces)

Keywords: EN IEC 61754-37:2025, IEC 61754-37, MDC connector, fibre optic connector interfaces, mechanical interface dimensions, duplex MDC, 1.25 mm ferrule, push‑pull latch, APC, PC.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2026
Optični spojni elementi in pasivne komponente - Vmesniki za optične konektorje -
37. del: Družina konektorjev vrste MDC (IEC 61754-37:2025)
Fibre optic interconnecting devices and passive components - Fibre optic connector
interfaces - Part 37: Type MDC connector family (IEC 61754-37:2025)
Lichtwellenleiter-Verbindungselemente und passive Bauteile - Steckgesichter von
Lichtwellenleiter-Steckverbindern - Teil 37: Steckverbinderfamilie Typ MDC (IEC 61754-
37:2025)
Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces de
connecteurs fibroniques - Partie 37: Famille de connecteurs de type MDC (IEC 61754-
37:2025)
Ta slovenski standard je istoveten z: EN IEC 61754-37:2025
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 61754-37

NORME EUROPÉENNE
EUROPÄISCHE NORM November 2025
ICS 33.180.20
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic connector interfaces - Part 37: Type MDC connector
family
(IEC 61754-37:2025)
Dispositifs d'interconnexion et composants passifs Lichtwellenleiter-Verbindungselemente und passive
fibroniques - Interfaces de connecteurs fibroniques - Partie Bauteile - Steckgesichter von Lichtwellenleiter-
37: Famille de connecteurs de type MDC Steckverbindern - Teil 37: Steckverbinderfamilie Typ MDC
(IEC 61754-37:2025) (IEC 61754-37:2025)
This European Standard was approved by CENELEC on 2025-10-15. 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 61754-37:2025 E

European foreword
The text of document 86B/5088/FDIS, future edition 1 of IEC 61754-37, 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 61754-37:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-10-31
document have to be withdrawn
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 61754-37:2025 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 61754-4 NOTE Approved as EN IEC 61754-4
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 60794-2-50 - Optical fibre cables - Part 2-50: Indoor EN IEC 60794-2-50 -
cables - Family specification for simplex
and duplex cables for use in terminated
cable assemblies
IEC 61754-1 - Fibre optic interconnecting devices and EN 61754-1 -
passive components - Fibre optic
connector interfaces - Part 1: General and
guidance
IEC 61755-3-1 - Fibre optic interconnecting devices and EN IEC 61755-3-1 -
passive components - Connector optical
interfaces - Part 3-1: Connector
parameters of dispersion unshifted single-
mode physically contacting fibres - Non-
angled 2,5 mm and 1,25 mm diameter
cylindrical full zirconia ferrules
IEC 61755-3-2 - Fibre optic interconnecting devices and EN IEC 61755-3-2 -
passive components - Connector optical
interfaces - Part 3-2: Connector
parameters of dispersion unshifted single-
mode physically contacting fibres - Angled
2,5 mm and 1,25 mm diameter cylindrical
full zirconia ferrules
IEC 63267 series Fibre optic interconnecting devices and EN IEC 63267 series
passive components - Fibre optic
connector optical interfaces
IEC 61754-37 ®
Edition 1.0 2025-09
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components - Fibre optic
connector interfaces -
Part 37: Type MDC connector family
ICS 33.180.20  ISBN 978-2-8327-0716-6

IEC 61754-37:2025-09(en)
IEC 61754-37:2025 © IEC 2025
CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Abbreviated terms. 4
5 Description . 4
6 Interfaces . 5
Annex A (informative) Additional adaptor dimensional information . 15
Annex B (normative) Oriented fibre core location . 21
Annex C (informative) MDC latch . 22
Bibliography . 24

Figure 1 – Duplex connector plug datum target . 5
Figure 2 – Duplex connector plug interface . 6
Figure 3 – Quadruplex connector plug interface . 6
Figure 4 – Angled PC duplex connector plug interface . 7
Figure 5 – Duplex adaptor interface . 9
Figure 6 – Quadruplex adaptor interface . 10
Figure 7 – Pin gauge for adaptors and active device receptacle interface . 11
Figure 8 – Duplex active device receptacle interface . 12
Figure 9 – Quadruplex active device receptacle interface . 13
Figure A.1 – Duplex reduced flange adaptor and full flange adaptor . 15
Figure A.2 – Quadruplex reduced flange adaptor and full flange adaptor . 17
Figure A.3 – Octoplex reduced flange adaptor and full flange adaptor . 19
Figure B.1 – Oriented fibre core locations . 21
Figure C.1 – Latch and latch release . 22
Figure C.2 – Thumb latch . 23

Table 1 – Plug to adaptor/receptacle intermateability . 5
Table 2 – Dimensions of the duplex connector plug interface (PC and APC) . 7
Table 3 – Dimensions of duplex and quadruplex adaptor interfaces . 10
Table 4 – Pin gauge dimensions . 11
Table 5 – Dimensions of duplex and quadruplex active device receptacle interface . 14
Table A.1 – Dimensions of duplex reduced flange adaptor and full flange adaptor . 16
Table A.2 – Dimensions of quadruplex reduced flange adaptor and full flange adaptor . 18
Table A.3 – Dimensions of octoplex reduced flange adaptor and full flange adaptor . 20

IEC 61754-37:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Fibre optic interconnecting devices and passive components -
Fibre optic connector interfaces -
Part 37: Type MDC connector family

FOREWORD
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shall not be held responsible for identifying any or all such patent rights.
IEC 61754-37 has been prepared by subcommittee 86B: Fibre optic interconnecting devices
and passive components, of IEC technical committee 86B: Fibre optics. It is an International
Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/5088/FDIS 86B/5120/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
IEC 61754-37:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61754 series, published under the general
...