kSIST FprEN 4734-101:2024

Aerospace series - Mechanical transfer contact, fibre optic contact Multi connectors - Part 101: MT male contact 12 ways - Technical specification

This document specifies the performance and dimensions of MT male contact 12 ways for EN 4733-001 connector specification.

Luft- und Raumfahrt - Haupt-Element - Teil 101: Technische Lieferbedingungen

Série aérospatiale - Contact à transfert mécanique, connecteurs à contact à fibre optique multivoies - Partie 101 : Contact MT mâle 12 voies - Spécification technique

Le présent document spécifie les performances et les dimensions d’un contact MT mâle 12 voies pour la spécification d’un connecteur EN 4733-001.

Aeronavtika - Mehanski prenosni kontakt, optični kontakt - Multi konektorji - 101. del: MT moški 12-polni kontakt - Tehnična specifikacija

General Information

• Status: Not Published
• Public Enquiry End Date: 05-May-2024
• ICS: 49.060 - Aerospace electric equipment and systems
• ICS: 49.090 - On-board equipment and instruments
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 04-Nov-2024
• Due Date: 23-Dec-2024
• Completion Date: 04-Nov-2024
• Ref Project: FprEN 4734-101 - Aerospace series - Mechanical transfer contact, fibre optic contact multi connectors - Part 101: MT male contact 12 ways - Technical specification

Overview

The kSIST FprEN 4734-101:2024 standard, titled Aerospace series - Mechanical transfer contact, fibre optic contact multi connectors - Part 101: MT male contact 12 ways - Technical specification, is a critical European draft standard developed under the auspices of CEN and ASD-STAN. It specifies the performance, dimensions, and technical requirements for 12-way MT male fibre optic contacts designed for aerospace applications, aligning with the prEN 4733-001 connector specifications.

This standard ensures interoperability, reliability, and consistent optical performance of MT mechanical transfer contacts (MTP), which are essential components in aerospace electrical and optical connection systems. By defining strict mechanical dimensions, optical insertion loss limits, retention forces, and assembly instructions, the document underpins robust connector manufacturing for demanding aerospace environments.

---

Key Topics

• Contact Composition and Dimensions
  Defines the physical structure of the 12-way MT male contact, including the contact body, ferrule, push springs, locking mechanisms, and guiding pins. Dimensions are provided in millimeters with tolerances to guarantee interchangeability.

• Polarization Keys
  The MT contact includes mechanical and visual polarization keys (color-coded P1 Blue and P2 Yellow) to prevent improper mating, ensuring correct optical channel alignment.

• Optical Performance Requirements
  Sets maximum allowable insertion loss (initial ≤ 0.35 dB, post-test ≤ 0.7 dB) and minimum return loss (≥ 20 dB), in compliance with EN 2591-601 and EN 2591-605 test methods. Channel-to-channel consistency for loss deviation is regulated.

• Mechanical Performance & Durability
  Details cable retention force minimum of 68 N, mating compression force range (7.8 N – 11.8 N), and mandates rigorous environmental and mechanical endurance tests based on EN 2591 series standards, including temperature endurance, salt mist, mechanical endurance, and cable twisting.

• Interoperability & Interface Specifications
  Guarantees compatibility with other MT ferrules and connectors from various suppliers, following the CEI-IEC 61754-5 MT connector family interface standards.

• Assembly and Termination Procedures
  Provides a thorough process for fiber preparation, epoxy injection, curing, polishing, spring assembly, crimping, and inspection, ensuring reliable contact terminations and high-quality optical performance.

---

Applications

• Aerospace Electrical and Optical Systems
  These 12-way MT male contacts are designed for use in harsh aerospace environments, supporting high-density, multi-fiber connections required for communication, navigation, and avionics systems.

• Military and Defense Aerospace Platforms
  Their robust construction and stringent testing make them suitable for defense aircraft, satellites, and space exploration vehicles requiring high reliability under extreme conditions.

• High-Performance Fiber Optic Systems
  Used where multiple fiber channels must be interconnected with low insertion and return losses, ensuring high data integrity and signal quality in critical aerospace fiber optic networks.

---

Related Standards

• prEN 4733-001: Defines the connector specifications that the MT contacts must comply with, including interface and operating temperature (125 °C) requirements.

• EN 2591-X Series: A comprehensive set of aerospace test methods used for validating optical and electrical connectors, covering endurance, environmental exposures, and mechanical durability.

• EN 4641-501: Specifies permissible fiber optic cables compatible with the connectors, including semi-loose 2.7 mm diameter fibers with 50 µm/125 µm glass fibers.

• CEI-IEC 61754-5: International standard specifying the MT family of fiber optic connector interfaces for mechanical and optical interoperability.

• TIA/EIA-598-C: Establishes standard color coding practices for optical fiber cables, referenced during cable ribbonizing and termination.

---

By adhering to the kSIST FprEN 4734-101:2024 standard, manufacturers and aerospace integrators ensure high-performance, reliable, and interoperable 12-way MT male fibre optic contacts designed specifically for the challenges and requirements of modern aerospace electric and optical systems. This contributes to more secure data transmission, structural integrity, and greater system longevity in critical aerospace applications.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 4734-101:2024
01-maj-2024
Aeronavtika - Mehanski prenosni kontakt, optični kontakt - Multi konektorji - 101.
del: MT moški 12-polni kontakt - Tehnična specifikacija
Aerospace series - Mechanical transfer contact, fibre optic contact Multi connectors -
Part 101: MT male contact 12 ways - Technical specification
Luft- und Raumfahrt - Haupt-Element - Teil 101: Technische Lieferbedingungen
Série aérospatiale - Contact à transfert mécanique, connecteurs à contact à fibre optique
multivoies - Partie 101 : Contact MT mâle 12 voies - Spécification technique
Ta slovenski standard je istoveten z: prEN 4734-101
ICS:
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
oSIST prEN 4734-101:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4734-101:2024
oSIST prEN 4734-101:2024
DRAFT
EUROPEAN STANDARD
prEN 4734-101
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2023
ICS 49.090
English Version
Aerospace series - Mechanical transfer contact, fibre optic
contact Multi connectors - Part 101: MT male contact 12
ways - Technical specification
Aerospace séries - Contact fibre optique multivoies - Luft- und Raumfahrt - Haupt-Element - Teil 101:
Partie 101 : Contact MT male 12 fibres - Spécification Technische Lieferbedingungen
technique
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, CEN 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4734-101:2023 E
worldwide for CEN national Members.

oSIST prEN 4734-101:2024
prEN 4734-101:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Fibre optic contact and definition . 4
4.1 Contact composition . 4
4.2 Contact dimensions and mass . 6
4.3 Polarization keys . 7
4.4 Mated contact force . 7
4.5 Alignment . 7
4.6 Interface . 7
4.7 Cable retention . 7
4.8 Mateability . 7
5 Optical performance . 8
5.1 Insertion loss . 8
5.2 Return loss . 8
5.3 Channel to channel consistency . 9
6 Permissible cables . 9
7 Technical specification . 9
8 Tests according to EN 2591-100 . 9
9 Assembly process instructions . 11
9.1 Cleaning instructions . 11
9.2 Tooling . 11
9.3 Termination instructions . 12
10 Designation . 13

oSIST prEN 4734-101:2024
prEN 4734-101:2023 (E)
European foreword
This document (prEN 4734-101:2023) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
oSIST prEN 4734-101:2024
prEN 4734-101:2023 (E)
1 Scope
This document specifies the performance and dimensions of MT male contact 12 ways for
prEN 4733-001 connector specification.
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.
EN 2591-X , Aerospace series — Elements of electrical and optical connection — Test methods
prEN 4733-001, Aerospace series — Connectors, optical, rectangular, modular — Operating
temperature 125 °C, for EN 4734-10X MT contacts — Part 001: Technical specification
EN 4641-501, Aerospace series — Cable optical — 125 µm diameter cladding — Part 501: Outer diameter
2,7 mm, semi loose structure — 12 optical ways —fibre diameter 50 µm/125 µm — Product standard
CEI-IEC 61754-5, International standard — Fibre optic connector interfaces — Part 5: Type MT connector
family
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 2591-100 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Fibre optic contact and definition
4.1 Contact composition
The different components which composed the MT male contact are shown in Figure 1.

As specified in this documen
...