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 defines the standard mechanical interface dimensions for the type MDC family of connectors.

Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces de connecteurs fibroniques - Partie 37: Famille de connecteurs de type MDC

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

General Information

• Status: Published
• Publication Date: 09-Sep-2025
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: PPUB - Publication issued
• Start Date: 10-Sep-2025
• Completion Date: 10-Oct-2025

Overview - IEC 61754-37:2025 (Type MDC connector family)

IEC 61754-37:2025 specifies the mechanical interface dimensions for the Type MDC connector family, a compact multi-fibre connector used in fibre optic interconnecting devices and passive components. The standard (Edition 1.0, 2025) defines plug, adaptor and active-device receptacle interfaces for duplex and quadruplex configurations, including both PC (physical contact) and APC (8° angled PC) optical endfaces. It provides dimensional tables, diagrams and intermateability rules to ensure mechanical compatibility across manufacturers and equipment.

Key technical topics and requirements

• Mechanical interface dimensions: Detailed dimensional tables and figures for duplex and quadruplex plugs, adaptors and receptacles (including pitch, radii and diameters).
• Ferrule characteristics: Uses two spring‑loaded 1.25 mm nominal OD ferrules per duplex plug; ferrule compression force for buffered fibre specified (5.0 N to 6.0 N) and guidance for non‑spring‑loaded designs.
• Optical endface types: Distinct interfaces for PC and APC (8° angled) ferrules; APC receptacles mate with APC plugs and PC with PC.
• Alignment and latching:
  • Optical alignment by a resilient split sleeve.
  • Push‑pull coupling latching mechanism described; Annex C gives additional MDC latch details.
• Interface identifiers: The standard defines interfaces 37-1 through 37-6 (duplex plug PC/APC, duplex adaptor, duplex receptacle, quadruplex adaptor and quadruplex receptacle) and provides a plug-to-adaptor/receptacle intermateability table.
• Ancillary information: Annex A (additional adaptor dimensional variants), Annex B (oriented fibre core location) and normative pin gauge and active device receptacle dimensions.

Practical applications and who uses this standard

IEC 61754-37 is essential for:

• Connector and cable manufacturers designing Type MDC plugs, adaptors and receptacles to ensure cross‑vendor compatibility.
• Optical transceiver and active device designers integrating MDC receptacles into modules and line cards.
• Data centre and telecom equipment engineers specifying compact multi‑fibre connector interfaces for high‑density cabling systems.
• Test labs and conformity bodies verifying mechanical interchangeability and connector mating performance.
• Systems integrators and installers selecting components that comply with standardized pitch, latch and ferrule interface criteria.

Using this standard reduces mechanical incompatibility, accelerates product development and supports reliable high‑density fibre deployments.

Related standards

Relevant normative references (cited by IEC 61754-37):

• IEC 61754-1 - General guidance for fibre optic connector interfaces
• IEC 61755-3-1 / 3-2 - Ferrule optical interface specifications (PC and APC)
• IEC 60794-2-50 - Indoor cable family specification for terminated assemblies
• IEC 63267 series - Multimode ferrule interfaces

Keywords: IEC 61754-37, MDC connector, fibre optic connector interfaces, duplex MDC, quadruplex MDC, PC/APC ferrule, connector mechanical dimensions, connector pitch, split sleeve alignment.

Standards Content (Sample)

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

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
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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

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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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.
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 title Fibre optic
interconnecting devices and passive components – Fibre optic connector interfaces, can be
found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
1 Scope
This part of IEC 61754 defines the standard mechanical interface dimensions for the type MDC
family of connectors.
2 Normative references
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.
IEC 60794-2-50, Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex
and duplex cables for use in terminated cable assemblies
IEC 61754-1, Fibre optic interconnecting devices and passive components - Fibre optic
connector interfaces - Part 1: General and guidance
IEC 61755-3-1, Fibre optic connector optical interfaces - Part 3-1: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia PC ferrule, single mode fibre
IEC 61755-3-2, Fibre optic connector optical interfaces - Part 3-2: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode
fibres
IEC 63267 (all parts), Fibre optic interconnecting devices and passive components - Fibre optic
connector optical interfaces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61754-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https
...

IEC 61754-37 ®
Edition 1.0 2025-09
NORME
INTERNATIONALE
Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces de
connecteurs fibroniques --
Partie 37: Famille de connecteurs de type MDC
ICS 33.180.20  ISBN 978-2-8327-0716-6

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SOMMAIRE
AVANT-PROPOS . 2
1 Domaine d’application . 4
2 Références normatives . 4
3 Termes et définitions . 4
4 Abréviations . 4
5 Description . 5
6 Interfaces . 5
Annexe A (informative) Informations complémentaires relatives aux dimensions du
raccord . 16
Annexe B (normative) Positionnement des cœurs de fibre orientés . 22
Annexe C (informative) Verrouillage MDC . 23
Bibliographie . 25

Figure 1 – Cibles de référence des fiches duplex . 6
Figure 2 – Interface de fiche duplex. 7
Figure 3 – Interface de fiche quadruplex . 7
Figure 4 – Interface de fiche duplex PC avec angle . 8
Figure 5 – Interface de raccord duplex . 10
Figure 6 – Interface de raccord quadruplex . 11
Figure 7 – Broche calibrée pour raccords et embases de dispositifs actifs . 12
Figure 8 – Interface d’embase de dispositif actif duplex . 13
Figure 9 – Interface d’embase de dispositif actif quadruplex . 14
Figure A.1 – Raccord à bride réduit duplex et raccord à bride complet duplex . 16
Figure A.2 – Raccord à bride réduit quadruplex et raccord à bride complet quadruplex . 18
Figure A.3 – Raccord à bride réduit optoplex et raccord à bride complet optoplex . 20
Figure B.1 – Positionnement des cœurs de fibre orientés . 22
Figure C.1 – Organe de verrouillage et organe de dégagement . 23
Figure C.2 – Verrouillage avec dégagement à l’aide du pouce. 24

Tableau 1 – Compatibilité d’accouplement entre fiche et raccord/embase. 5
Tableau 2 – Dimensions de l’interface de fiche duplex (PC et APC) . 8
Tableau 3 – Dimensions des interfaces de raccords duplex et quadruplex . 11
Tableau 4 – Dimensions de broches calibrées . 12
Tableau 5 – Dimensions des interfaces d’embases de dispositifs actifs duplex et
quadruplex. 15
Tableau A.1 – Dimensions d’un raccord à bride réduit duplex et d’un raccord à bride
complet duplex . 17
Tableau A.2 – Dimensions d’un raccord à bride réduit quadruplex et d’un raccord à
bride complet quadruplex . 19
Tableau A.3 – Dimensions d’un raccord à bride réduit optoplex et d’un raccord à bride
complet optoplex . 21

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Dispositifs d’interconnexion et composants passifs fibroniques -
Interfaces de connecteurs fibroniques -
Partie 37: Famille de connecteurs de type MDC

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L’IEC 61754-37 a été établie par le sous-comité 86B: Dispositifs d’interconnexion et
composants passifs à fibres optiques, du comité d’études 86B de l’IEC: Fibres optiques. Il s’agit
d’une Norme internationale.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
86B/5088/FDIS 86B/5120/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l’élaboration de cette Norme internationale est l’anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l’IEC sont décrits plus en détail sous www.iec.ch/publications.
Une liste de toutes les parties de la série IEC 61754, publiées sous le titre général Dispositifs
d’interconnexion et composants passifs à fibres optiques - Interfaces de connecteurs à fibres
optiques, se trouve sur le site web de l’IEC.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l’IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
• reconduit,
• supprimé, ou
• révisé.
1 Domaine d’application
La présente partie de l’IEC 61754 définit les dimensions des interfaces mécaniques normales
pour la famille de connecteurs de type MDC.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l’édition citée s’applique. Pour les références non datées, la dernière édition du document de
référence s’applique (y compris les éventuels amendements).
IEC 60794-2-50, Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de
famille pour les câbles simplex et duplex utilisés dans les ensembles de câbles équipés
IEC 61754-1, Dispositifs d’interconnexion et composants passifs à fibres optiques - Interfaces
de connecteurs à fibres optiques - Partie 1: Généralités et lignes directrices
IEC 61755-3-1, Dispositifs d’interconnexion et composants passifs fibroniques - Interfaces
optiques de connecteurs - Partie 3-1: Paramètres des connecteurs pour fibres unimodales à
dispersion non décalée en contact physique - Ferrules cylindriques sans angle en zircone pleine
de 2,5 mm et 1,25 mm de diamètre
IEC 61755-3-2, Dispositifs d’interconnexion et composants passifs fibroniques - Interfaces
optiques de connecteurs - Partie 3-2: Paramètres des connecteurs pour fibres unimodales à
dispersion non décalée en contact physique - Ferrules cylindriques avec angle en zircone pleine
de 2,5 mm et 1,25 mm de diamètre
IEC 63267 (toutes les parties), Dispositifs d’interconnexion et composants passifs fibroniques -
Interfaces optiques de connecteurs fibroniques
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions de l’IEC 61754-1 s’appliquent.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
• IEC Electropedia: disponible à l’adresse https://www.electropedia.org/
• ISO Online browsing platform: disponible à l’adresse https://www.iso.org/obp
4 Abréviations
APC Angled Physical Contact (contact physique avec angle)
OD Outer Diameter (diamètre extérieur)
PC Physical Contact (contact physique)
5 Description
Le connecteur parent de la fa
...

IEC 61754-37 ®
Edition 1.0 2025-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components - Fibre optic
connector interfaces -
Part 37: Type MDC connector family

Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces de
connecteurs fibroniques --
Partie 37: Famille de connecteurs de type MDC
ICS 33.180.20  ISBN 978-2-8327-0716-6

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

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les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
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CH-1211 Geneva 20 www.iec.ch
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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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

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

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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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.
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 title Fibre optic
interconnecting devices and passive components – Fibre optic connector interfaces, can be
found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
1 Scope
This part of IEC 61754 defines the standard mechanical interface dimensions for the type MDC
family of connectors.
2 Normative references
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.
IEC 60794-2-50, Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex
and duplex cables for use in terminated cable assemblies
IEC 61754-1, Fibre optic interconnecting devices and passive components - Fibre optic
connector interfaces - Part 1: General and guidance
IEC 61755-3-1, Fibre optic connector optical interfaces - Part 3-1: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia PC ferrule, single mode fibre
IEC 61755-3-2, Fibre optic connector optical interfaces - Part 3-2: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode
fibres
IEC 63267 (all parts), Fibre optic interconnecting devices and passive components - Fibre optic
connector optical interfaces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61754-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Abbreviated terms
APC angled physical contact
OD outer diameter
PC physical contact
5 Description
The parent connector for type MDC connector family is a duplex connector set of
plug/adaptor/plug configuration which is characterized by the following.
– The connector includes two 1,25 mm [nominal outer diameter (OD)], spring-loaded ferrules.
– The connector has a push-pull coupling latching mechanism.
– The optical alignment mechanism of the connectors is a resilient split sleeve.
Refer to Annex A for additional adaptor dimensional information.
Refer to Annex B for oriented fibre core location information.
Refer to Annex C for MDC latch information.
6 Interfaces
This document contains the following standard interfaces:
interface 37-1: duplex connector plug interface – physical contact (PC);
interface 37-2: duplex connector plug interface – angled physical contact, 8° (APC);
interface 37-3: duplex adaptor interface;
interface 37-4: duplex active device receptacle interface;
interface 37-5: quadruplex adaptor interface;
interface 37-6: quadruplex active device receptacle interface.
The intermateability between plugs, adaptors, and receptacles is provided in Table 1.
Table 1 – Plug to adaptor/receptacle intermateability
Adaptor interfaces and active device receptacle interfaces
Plug interfaces
37-3 37-4 37-5 37-6
a a
Mate Mate
37-1 Mate Mate
a a
Mate Mate
37-2 Mate Mate
a
Receptacle and plug shall have similar polished endfaces. APC receptacle will mate with APC plug and PC
receptacle will mate with PC plug.

Duplex connector plug datum targets are shown in Figure 1.

a) Connector top view
b) Connector side view
Figure 1 – Duplex connector plug datum target
Duplex plug optical interface dimensions are detailed in Figure 2 and Table 2. Additional details
for duplex plug optical interface – APC are shown in Figure 4 and Table 2. Multiple duplex plug
optical connectors can be attached as one unit. Each duplex plug optical interface is spaced at
intervals of M pitch to create multiple duplex plug optical interfaces. As an example, the
quadruplex plug optical interface is shown in Figure 3.

Figure 2 – Duplex connector plug interface
Refer to Annex B for oriented fibre core locations.

Figure 3 – Quadruplex connector plug interface
NOTE In all views, opposing 8° angled ferrule endfaces are shown. In the top view, the bottom ferrule is hidden for
clarity. In the bottom view, the top ferrule is hidden for clarity.
Figure 4 – Angled PC duplex connector plug interface
Table 2 – Dimensions of the duplex connector plug interface (PC and APC)
Dimensions
Reference mm
Notes
Minimum Maximum
A 3,05 3,15
B 3,0 3,2 Diameter
C 4,88 5,00
a,b
14,2 14,7
D
E 4,75 -
F 4,83 4,90
G 8,8 9,0
H 7,1 7,4
J 5,8 5,9
K 3,0 3,1
L 2,4 -
M 3,85 3,95 Connector pitch
c,d
N 1,248 5 1,249 5 Diameter
O 3,3 3,5
P 1,2 1,4
S 12,45 12,55
Dimensions
Reference mm Notes
Minimum Maximum
e
T1 8 Angle (degrees), typical
e
8 Angle (degrees), typical
T2
U 3,65 3,75
V 5,45 5,60
W 0,35 0,50
X 0 0,15 Radius
NOTE These dimensional requirements apply to the finished ferrule, after all polishing procedures have been
completed.
a
Each ferrule is movable by a certain axial compression force, with direct contacting endface, and therefore
dimension D is variable. Ferrule compression force shall be 5,0 N to 6,0 N when the position of the optical
datum target, dimension D is moved to the range 13,85 mm to 13,95 mm. Forces are for buffered fibre only,
different cord constructions can result in higher forces, see IEC 60794-2-50.
b
Dimension D should be in the range of 13,75 mm to 13,95 mm for non-spring loaded connectors.
c
Values provided for single-mode fibre. Acceptable minimum for multimode fibre is 1,246 7 mm.
d
For PC ferrules, please refer to IEC 61755-3-1 for ferrule dimensions and ferrule optical interface parameter
values. For APC ferrules, please refer to IEC 61755-3-2 for ferrule dimensions and ferrule optical interface
parameter values. For multimode ferrules, please refer to the IEC 63267 series.
e
See IEC 61755-3-2.
The duplex adaptor interface is the basis for all adaptor variants. Duplex adaptor interfaces are
spaced at intervals of M pitch to create multiple duplex adaptor interfaces. The duplex adaptor
interface is shown in Figure 5 and the quadruplex adaptor interface is shown in Figure 6.
Dimensions for the duplex and quadruplex adaptor interfaces are provided in Table 3.
Figure 5 – Duplex adaptor interface
NOTE In Figure 5 and Figure 6 only one-half of the adaptor is shown. For aligned key adaptors, adaptor halves are
symmetric about the optical datum target. For opposed key adaptors, adaptor halves are symmetric about the optical
datum target and opposing adaptor half is rotated 180⁰ about the axis between the ferrules.
Figure 6 – Quadruplex adaptor interface
Table 3 – Dimensions of duplex and quadruplex adaptor interfaces
Dimensions
Reference mm Notes
Minimum Maximum
A 3,05 3,15
B 2,87 2,97 Diameter
C 4,00 4,10
D 13,85 13,95
E - 5,90
F 4,90 4,97
G 9,05 9,15
H 7,40 -
I 1,40 1,50 Diameter
J 5,93 6,03
K 3,18 3,28
L 1,0 2,0
Dimensions
Reference mm Notes
Minimum Maximum
a
M 3,85 3,95 Connector pitch
b
- - Diameter
N
O 1,10 1,20
P 1,65 1,80
Q 1,35 1,50
R 15,2 15,5
a
Dimension M is the pitch between multiple adaptor interfaces for all adaptors except duplex adaptors. M is not
applicable for a duplex adaptor.
b
The connector alignment feature is a resilient (split) alignment sleeve. The feature must accept a pin gauge to
the centre of the adaptor with a force of 1,0 N to 2,5 N under the condition that another pin gauge is inserted
into the feature from the other side until both pin gauges butt against each other. The pin gauge shall be
1,249 0 mm. The centre of the adaptor is defined by the left side position of dimension D.

Pin gauge for adaptors and active device receptacle is shown in Figure 7. The pin gauge
dimensions are given in Table 4.

Figure 7 – Pin gauge for adaptors and active device receptacle interface
Table 4 – Pin gauge dimensions
A (diameter) B
Pin gauge
mm mm Notes
grade
Minimum Maximum Minimum Maximum
a
1,249 1,248 8 1,249 2 4,2 15
Resilient sleeve
a
Surface roughness should be < 0,2 µm Ra; cylindricity is less than 0,5 µm.

The duplex active device interface is the basis for all active device variants. Duplex active
device interfaces are spaced at intervals of M pitch to create multiple duplex active device
interfaces. The duplex active device interface is shown in Figure 8 and the quadruplex active
device interface is shown in Figure 9. Dimensions for the duplex and quadruplex active device
interfaces are provided in Table 5.
Figure 8 – Duplex active device receptacle interface
Figure 9 – Quadruplex active device receptacle interface
Table 5 – Dimensions of duplex and quadruplex active device receptacle interface
Dimensions
Reference mm Notes
Minimum Maximum
A 3,05 3,15
B 2,87 2,97 Diameter
C 4,00 4,10
D 13,85 13,95
E - 5,90
F 4,90 4,97
G 9,05 9,15
H 7,40 -
I 1,40 1,50 Diameter
J 5,93 6,03
K 3,18 3,28
L 7,77 7,97
a
M 3,85 3,95 Connector pitch
b
- - Diameter
N
O 1,10 1,20
P 1,65 1,80
Q 1,35 1,50
a
Dimension M is the pitch between multiple adaptor interfaces for all adaptors except duplex adaptors. M is not
applicable for a duplex adaptor.
b
The connector alignment feature is a resilient (split) alignment sleeve. The feature shall accept a pin gauge to
the centre of the adaptor with a force of 1,0 N to 2,5 N. The pin gauge shall be 1,249 0 mm. The centre of the
adaptor is defined by the left side position of dimension D.

Annex A
(informative)
Additional adaptor dimensional information
The duplex full flange adaptor and reduced flange adaptor are shown in Figure A.1 and
Table A.1 along with the mounting hole and cut-out dimensions.

a) Duplex reduced flange adaptor

b) Duplex full flange adaptor with mounting hole and panel cut-out

Figure A.1 – Duplex reduced flange adaptor and full flange adaptor
Table A.1 – Dimensions of duplex reduced flange adaptor and full flange adaptor
Dimensions
Reference mm Notes
Minimum Maximum
A 30,30 31,30
B 5,65 5,85
C 12,85 12,95
D 13,0 13,5
E 5,9 6,4
F - 15,6
G 17,75 18,25
H 2,9 3,1
a
1,7 1,9
I
J 16,75 17,05
K 15,28 15,68
L 15,20 15,60
M 15,20 15,60
P 2,4 2,6 Diameter
Q 22,00
R 17,75 18,25
S 2,4 2,6 Diameter
a
Panel thickness should be between 1,0 mm and 1,6 mm.

The quadruplex full flange adaptor and reduced flange adaptor are shown in Figure A.2 and
Table A.2 along with the mounting hole and cut-out dimensions. The quadruplex full flange
adaptor mounting hole and cut-out dimensions are equivalent to the SC mounting hole and cut-
out dimensions.
a) Quadruplex reduced flange adaptor

b) Quadruplex full flange adaptor with mounting hole and panel cut-out

Figure A.2 – Quadruplex reduced flange adaptor and full flange adaptor
Table A.2 – Dimensions of quadruplex reduced flange adaptor and full flange adaptor
Dimensions
Reference mm Notes
Minimum Maximum
A 30,30 31,30
B 9,25 9,35
C 12,85 12,95
D 13,0 13,5
E 9,5 10,0
F - 15,6
G 17,75 18,25
H 2,9 3,1
a
1,7 1,9
I
J 16,75 17,05
K 15,28 15,68
L 15,20 15,60
M 15,20 15,60
N 3,85 3,95
P 2,4 2,6 Diameter
Q 22,00
R 17,75 18,25
S 2,4 2,6 Diameter
a
Panel thickness should be between 1,0 mm and 1,6 mm.

The octoplex full flange adaptor and reduced flange adaptor are shown in Figure A.3 and
Table A.3 along with the mounting hole and cut-out dimensions.
a) Octoplex reduced flange adaptor

b) Octoplex full flange adaptor with mounting hole and panel cut-out

Figure A.3 – Octoplex reduced flange adaptor and full flange adaptor
Table A.3 – Dimensions of octoplex reduced flange adaptor and full flange adaptor
Dimensions
Reference mm Notes
Minimum Maximum
B 12,85 12,95
C 17,4 17,5
D 17,6 18,1
E 13,2 13,7
F - 20,0
G 21,55 22,05
H 2,9 3,1
a
1,7 1,9
I
K 19,2 19,6
L 15,2 15,6
M 15,2 15,6
N 3,85 3,95
P 2,4 2,6 Diameter
Q - 27,0
R 21,55 22,05
S 2,4 2,6 Diameter
a
Panel thickness should be between 1,0 mm and 1,6 mm.

Annex B
(normative)
Oriented fibre core location
The fibre core locations (keyholes) shall be oriented outwards and opposite to the other fibre,
as shown in Figure B.1. This definition is applicable for non-angled (PC) and angled (APC)
ferrules with oriented fibre cores.
NOTE This definition is partly different from the definition in IEC 61755-3-1 and IEC 61755-3-2 where the fibre core
location is specified as oriented toward the guide key.

Figure B.1 – Oriented fibre core locations
Annex C
(informative)
MDC latch
Latching an MDC connector to adaptor can be accomplished using many different methods
following the MDC connector and adaptor interface dimensions provided previously in this
document. Two examples of potential latch designs are shown below. Figure C.1 shows a latch
and latch release design. Figure C.2 shows a thumb latch design.

a) Latched position
b) Connector removal
Figure C.1
...