IEC 61754-5:1996

INTERNATIONAL
IEC
STANDARD
1754-5
First edition
1996-12
Fibre optic connector interfaces –
Part 5:
Type MT connector family
Interfaces de connecteurs
pour fibres optiques –
Partie 5:
Famille de connecteurs de type MT

Reference number
IEC 1754-5: 1996 (E)
Validité de la présente publication Validity of this publication

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Terminologie Terminology
En ce qui concerne la terminologie générale, le lecteur se For general terminology, readers are referred to IEC 50:
reportera à la CEI 50: Vocabulaire Electrotechnique Inter- International Electrotechnical Vocabulary (IEV), which is
national (VEI), qui se présente sous forme de chapitres issued in the form of separate chapters each dealing
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Les termes et définitions figurant dans la présente publi- The terms and definitions contained in the present publi-
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Symboles graphiques et littéraux Graphical and letter symbols
Pour les symboles graphiques, les symboles littéraux et les For graphical symbols, and letter symbols and signs
signes d'usage général approuvés par la CEI, le lecteur approved by the IEC for general use, readers are referred to
consultera: publications:
– la CEI 27: Symboles littéraux à utiliser en – IEC 27: Letter symbols to be used in electrical
électro-technique; technology;
– la CEI 417: Symboles graphiques utilisables – IEC 417: Graphical symbols for use on
sur le matériel. Index, relevé et compilation des equipment. Index, survey and compilation of the
feuilles individuelles; single sheets;
– la CEI 617: Symboles graphiques pour schémas; – IEC 617: Graphical symbols for diagrams;

et pour les appareils électromédicaux, and for medical electrical equipment,
– la CEI 878: Symboles graphiques pour – IEC 878: Graphical symbols for electromedical
équipements électriques en pratique médicale. equipment in medical practice.
Les symboles et signes contenus dans la présente publi- The symbols and signs contained in the present publication
cation ont été soit tirés de la CEI 27, de la CEI 417, de la have either been taken from IEC 27, IEC 417, IEC 617
CEI 617 et/ou de la CEI 878, soit spécifiquement approuvés and/or IEC 878, or have been specifically approved for the
aux fins de cette publication. purpose of this publication.
Publications de la CEI établies par le IEC publications prepared by the same
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L'attention du lecteur est attirée sur les listes figurant à la fin The attention of readers is drawn to the end pages of this
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CEI préparées par le comité d'études qui a établi la technical committee which has prepared the present
présente publication. publication.

INTERNATIONAL
IEC
STANDARD
1754-5
First edition
1996-12
Fibre optic connector interfaces –
Part 5:
Type MT connector family
Interfaces de connecteurs
pour fibres optiques –
Partie 5:
Famille de connecteurs de type MT

 CEI 1996  Droits de reproduction réservés  Copyright - all rights reserved
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microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher
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PRICE CODE L
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

– 2 – 1754-5 © IEC:1996 (E)
CONTENTS
Page
FOREWORD . 3

Clause
1 Scope. 4

2 Description. 4
3 Interfaces. 4

1754-5 © IEC:1996 (E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

_________
FIBRE OPTIC CONNECTOR INTERFACES –

Part 5: Type MT connector family

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 1754-5 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/835/FDIS 86B/925/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 1754-5 © IEC:1996 (E)
FIBRE OPTIC CONNECTOR INTERFACES –

Part 5: Type MT connector family

1 Scope
This part of IEC 1754 defines the standard interface dimensions for the type MT family of

connectors.
2 Description
The parent connector for type MT connector family is a multiway plug connector characterized
by a rectangular ferrule, typically 2,5 mm by 6,4 mm. The connector is aligned using two
alignment pins and is normally secured by the use of a latching spring.
Each connector interface may be configured in a number of ways as shown in figure 1. In the
parent version, the two alignment pins are free to move within the plug bodies, and hence when
unplugged may be located in either plug. The connector may also be configured with one pin
fixed in each half (a hermaphroditic variant), or with both pins fixed in one plug (a plug and
socket variant). Figure 1 shows which variants are intermateable as follows:
a) parent plug to parent plug using two free pins;
b) single pin plug to parent plug using one extra free pin;
c) two pin plug to parent plug;
d) single pin plug to single pin plug.
NOTE – The two pin plug will not intermate with the single pin plug.
Different connector interfaces will intermate and will correctly align the lower defined number of
optical datum targets.
3 Interfaces
This standard contains the following standard interface:
Interface 5-1  MT interface dimensions

1754-5 © IEC:1996 (E) – 5 –
Figure 1 – MT plug configuration and intermateability options

– 6 – 1754-5 © IEC:1996 (E)
Figure 2a – MT alignment pin
Table 1a – Dimensions for MT alignment pin
Dimensions
Reference mm Notes
Minimum Maximum
A 0,697 0,699
B0,2 0,4
C0,2 0,5
D 10,8 11,2 Typical
1754-5 © IEC:1996 (E) – 7 –
Figure 2b – MT clamp spring
Table 1b – Dimensions for MT clamp spring
Dimensions
Notes
Reference mm
Minimum Maximum
M1 14,7 15,7 1
M2 15,8 16,2 2
J1 3,1 3,3 3
J2 3,6 3,8 4
NOTES
1 Length in free condition.
2 Compression force for clamping condition shall be 6,8 N to 12,8 N when dimension M2
is between 15,8 mm and 16,2 mm.
3 Dimensions for MT 2, 4, 8.
4 Dimensions for MT 10, 12.
– 8 – 1754-5 © IEC:1996 (E)
NOTE – For optical datum target locations see figure 2d. Here, datum X is defined as the line passing through two
pin hole centres and datum Y is defined as the line perpendicular to datum X and passing through the midpoint.
Figure 2c – MT interface
Table 1c – Dimensions for MT interface
Dimensions
Reference mm Notes
Minimum Maximum
A 0,699 0,701 1
B7,9 8,1
C 4,597 4,603 2
D6,3 6,5
E2,4 2,5
NOTES
1 Each guide pin hole must accept a gauge pin as shown in figure 2f to a depth
of 5,5 mm with a maximum force of 1,7 N. In addition, two guide pin holes of a plug
must accept a gauge as shown in figure 2e to a depth of 5,5 mm with a maximum
force of 3,4 N.
2 Dimension C is defined as the distance between two pin hole centres.

1754-5 © IEC:1996 (E) – 9 –
Figure 2d – Optical datum target location on plug endface

– 10 – 1754-5 © IEC:1996 (E)
Figure 2e – Gauge for guide pin holes
Table 1d – Dimensions for gauge for guide pin holes
Dimensions
Reference mm Notes
Minimum Maximum
A 0,6985 0,6990 for two pins, 1
C 4,5995 4,6005
D6,3 6,5 2
U2,4 2,5 2
BA 0,2 0,4
BB 0,2 0,5
BC 6,0 6,5
NOTES
1 Surface roughness R = 0,1 μm.
z
2 Typical dimensions.
1754-5 © IEC:1996 (E) – 11 –
Figure 2f – MT alignment pin hole gauge
Table 1e – Dimensions for MT alignment pin hole gauge
Reference Dimensions Notes
mm
Minimum Maximum
A 0,6985 0,6990 1
B0,2 0,4
C0,2 0,5
D 10,8 11,2 2
E6,0 –
NOTES
1 Surface roughness R = 0,1 μm for the length of dimension E.
z
2 Typical dimensions.
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