SIST EN 4641-301:2024

Aerospace series - Cables, optical 125 μm diameter cladding - Part 301: Tight structure 50/125 μm GI, fibre nominal 1,8 mm, outside diameter - Product standard

This document specifies the general characteristics, conditions for qualification, acceptance and quality assurance for a fibre optic cable with a 50/125 µm Graded Index fibre core, 1,8 mm outside diameter for non-pull-proof contact designs.

Luft- und Raumfahrt - Lichtwellenleiterkabel, Mantelaußendurchmesser 125 µm - Teil 301: Fester Aufbau, 50/125 µm GI-Faser, Kabelaußendurchmesser 1,8 mm - Produktnorm

No Scope available

Série Aérospatiale - Câbles, optiques, diamètre extérieur de la gaine optique 125 μm - Partie 301 : Câble à structure serrée, fibre à gradient d’indice 50/125 μm, diamètre extérieur 1,8 mm - Norme de produit

Le présent document spécifie les caractéristiques générales ainsi que les conditions de qualification, de réception et d'assurance qualité pour un câble à fibre optique avec une âme de fibre à gradient d'indice 50/125 µm, un diamètre extérieur de 1,8 mm, pour les conceptions de contact résistant à la traction.

Aeronavtika - Kabli, optični, zunanji premer obloge vlakna 125 µm - 301. del: Kompaktna struktura 50/125 µm GI, imenski zunanji premer kabla 1,8 mm - Standard za izdelek

Ta dokument določa splošne značilnosti ter pogoje kvalifikacije, sprejemljivosti in zagotavljanja kakovosti za optični kabel z jedrom iz gradientnih indeksnih vlaken 50/125 µm ter zunanjim premerom 1,8 mm za spoje, ki se v primeru sile razdružijo.

General Information

• Status: Published
• Public Enquiry End Date: 14-Sep-2022
• Publication Date: 29-Aug-2024
• ICS: 29.060.20 - Cables
• ICS: 33.180.10 - Fibres and cables
• ICS: 49.060 - Aerospace electric equipment and systems
• ICS: 49.090 - On-board equipment and instruments
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-Aug-2024
• Due Date: 02-Nov-2024
• Completion Date: 30-Aug-2024
• Ref Project: EN 4641-301:2024 - Aerospace series - Cables, optical, 125 μm diameter cladding - Part 301: Tight structure 50/125 μm GI, fibre nominal 1,8 mm, outside diameter - Product standard

Relations

• Revises: SIST EN 4641-301:2022 - Aerospace series - Cables, optical 125 μm diameter cladding - Part 301: Tight structure 50/125 μm GI, fibre nominal 1,8 mm, outside diameter - Product standard
• Effective Date: 10-Jan-2024

Overview

EN 4641-301:2024 is a CEN product standard in the Aerospace series that specifies the requirements, qualification, acceptance and quality assurance for a tight-structure graded-index optical cable with a 50/125 µm GI fibre core and a nominal outside diameter of 1.8 mm. It applies to non-pull-proof contact designs used in aircraft and aerospace equipment and was approved by CEN in 2024 (supersedes EN 4641-301:2022). The standard defines construction, materials, dimensional limits, environmental and mechanical performance and test methods (referencing the EN 3745 series).

Key topics and technical requirements

• Scope & purpose: Product standard for 50/125 µm GI fibre, 1.8 mm finished cable for aerospace use; covers general characteristics, qualification, acceptance and QA.
• Cable construction: Core, cladding, primary and secondary buffers, strength member (e.g., aramid/aramid–fibre glass) and outer jacket. Figure and table definitions specify layer order and dimensions.
• Dimensional and optical limits:
  • Core diameter: (50 ± 3) µm; cladding: (125 ± 2) µm
  • Finished cable diameter: (1.80 ± 0.1) mm; primary buffer ~245 µm
  • Core/cladding concentricity ≤ 3 µm; non‑circularity limits for core/cladding
  • Attenuation: ≤ 5 dB/km @ 850 nm; ≤ 3 dB/km @ 1300 nm (at +20 °C)
  • Numerical aperture: 0.2 ± 0.015 at 850 nm; bandwidth ≥ 500 MHz·km at 850 and 1300 nm
• Mechanical and environmental:
  • Operating temperature range: −60 °C to +135 °C
  • Tensile strength > 200 N; minimum bend radii and storage/installation radii specified
  • Strength member weave pitch and cable mass limits (≤ 5 kg/km)
• Materials: Silica core and cladding, polyacrylate primary buffer, polymer secondary buffer and jacket, aramid reinforcement.
• Testing & compliance: Calls up EN 3745 series test methods (visual, dimensions, attenuation, ageing, thermal cycling, flammability, fluid resistance, humidity, mechanical tests such as tensile/impact/abrasion, smoke/toxicity, etc.). Includes requirements for marking, packaging, delivery lengths and storage.

Applications

• Use in aircraft internal harnesses and avionics interconnects where compact, lightweight graded‑index multimode fibre is required.
• Suitable for data links, sensor cabling and non‑pull‑proof contact connections within aerospace platforms where compliance with aerospace test methods and environmental limits is required.

Who should use this standard

• Aerospace cable manufacturers and suppliers
• Avionics and systems engineers specifying interconnects
• Quality, test and certification laboratories performing qualification and acceptance tests
• Procurement and regulatory teams ensuring component compliance with CEN aerospace requirements

Related standards

• EN 3745 series (test methods for fibres and cables, optical - aircraft use)
• EN 4641-001 (technical specification)
• EN 2424 (marking of aerospace products)

Keywords: EN 4641-301:2024, aerospace optical cable, 50/125 µm, 1.8 mm, graded index, fibre optic cable, CEN, EN 3745.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2024
Aeronavtika - Kabli, optični, zunanji premer obloge vlakna 125 µm - 301. del:
Kompaktna struktura 50/125 µm GI, imenski zunanji premer kabla 1,8 mm -
Standard za izdelek
Aerospace series - Cables, optical 125 μm diameter cladding - Part 301: Tight structure
50/125 μm GI, fibre nominal 1,8 mm, outside diameter - Product standard
Luft- und Raumfahrt - Lichtwellenleiterkabel, Mantelaußendurchmesser 125 µm - Teil
301: Fester Aufbau, 50/125 µm GI-Faser, Kabelaußendurchmesser 1,8 mm -
Produktnorm
Série Aérospatiale - Câbles, optiques, diamètre extérieur de la gaine optique 125 μm -
Partie 301 : Câble à structure serrée, fibre à gradient d’indice 50/125 μm, diamètre
extérieur 1,8 mm - Norme de produit
Ta slovenski standard je istoveten z: EN 4641-301:2024
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4641-301
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2024
EUROPÄISCHE NORM
ICS 49.090 Supersedes EN 4641-301:2022
English Version
Aerospace series - Cables, optical, 125 µm diameter
cladding - Part 301: Tight structure 50/125 µm GI, fibre
nominal 1,8 mm, outside diameter - Product standard
Série Aérospatiale - Câbles, optiques, diamètre Luft- und Raumfahrt - Lichtwellenleiterkabel,
extérieur de la gaine optique 125 µm - Partie 301 : Claddingdurchmesser 125 µm - Teil 301:
Câble à structure serrée, fibre à gradient d'indice Festaderaufbau GI 50/125 µm, Faser
50/125 µm, diamètre extérieur 1,8 mm - Norme de Kabelaußendurchmesser 1,8 mm - Produktnorm
produit
This European Standard was approved by CEN on 19 May 2024.

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. 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 CEN
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 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4641-301:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 6
4 Required characteristics . 6
5 Cable construction . 7
6 Materials . 8
7 Test methods and performances . 8
7.1 Tests in accordance with EN 3745-100 . 8
7.1.1 Optical fibre . 8
7.1.2 Fibre optic cable . 9
7.2 Fluid test. 15
8 Tooling . 16
9 Quality assurance . 16
10 Designation and marking . 16
10.1 General principle of designation . 16
10.2 Marking . 16
10.3 Colours . 16
11 Delivery conditions . 17
11.1 Packaging . 17
11.2 Labelling . 17
11.3 Delivery lengths. 17
12 Storage . 17
13 Technical specification . 17
Bibliography . 18

European foreword
This document (EN 4641-301:2024) has been prepared by 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 shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2025, and conflicting national standards shall be
withdrawn at the latest by February 2025.
— Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
— This document supersedes EN 4641-301:2022.
The main changes with respect to the previous edition are as follows:
— EN 4641-301 (P2), 03/2022 — General editorial improvements and update of Clause 2 with
addition of references from the bibliography.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this document: 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 the United
Kingdom.
1 Scope
This document specifies the general characteristics, conditions for qualification, acceptance and quality
assurance for a fibre optic cable with a 50/125 µm Graded Index fibre core, 1,8 mm outside diameter
for non-pull-proof contact designs.
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 2424, Aerospace series — Marking of aerospace products
EN 3745-100, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 100:
General
EN 3745-201, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 201:
Visual examination
EN 3745-202, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 202:
Fibre dimensions
EN 3745-203, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 203:
Cable dimensions
EN 3745-205, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 205:
Cable longitudinal dimensional stability
EN 3745-301, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 301:
Attenuation
EN 3745-302, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 302:
Numerical aperture
EN 3745-303, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 303:
Bandwidth
EN 3745-305, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 305:
Immunity to ambient light coupling
EN 3745-306, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 306:
Variation of attenuation during temperature cycling
EN 3745-401, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 307:
Accelerated ageing
EN 3745-402, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 402:
Temperature cycling
Published as ASD-STAN prEN at the date of publication of this document, available at: https://www/asd–
stan.org/.
EN 3745-404, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 404:
Thermal shock
EN 3745-407, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 407:
Flammability
EN 3745-410, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 410:
Thermal life
EN 3745-411, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 411:
Resistance to fluids
EN 3745-412, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 412:
Humidity resistance
EN 3745-501, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 501:
Optical fibre proof test
EN 3745-503, Aerospace series — Fibres and cables, optical, aircraft use — Test methods— Part 503:
Scrape abrasion
EN 3745-504, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 504:
Micro bending test
EN 3745-505, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 505:
Cable tensile strength
EN 3745-506, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 506:
Impact resistance
EN 3745-507, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 507:
Cut-through
EN 3745-508, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 508:
Torsion
EN 3745-509, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 509:
Sensibilité à la pliure
EN 3745-510, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 510:
Bending test
EN 3745-511, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 511:
Cable to cable abrasion
EN 3745-512, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 512:
Flexure endurance
EN 3745-513, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 513:
Crush resistance
EN 3745-517, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 517:
Cable tie clamping test
EN 3745-601, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 601:
Smoke density
EN 3745-602, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 602:
Toxicity
EN 3745-701, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 701:
Strippability
EN 3745-703, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 703:
Durability of manufacturer's marking
EN 3745-705, Aerospace series — Fibres and cables, optical, aircraft use — Test methods — Part 705:
Mesure de contraste
EN 4056-001, Aerospace series — Cable ties for harnesses — Part 001: Technical specification
EN 4641-001, Aerospace series — Cables, optical, 125 µm diameter cladding — Part 001: Technical
specification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 3745-100 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 Required characteristics
The characteristics of the cables, tested according to the methods described hereafter, shall comply
with the values defined in this product standard.

5 Cable construction
Cable construction shall be in accordance with Figure 1 and Table 1.

Key
1 Core
2 Cladding
3 Primary buffer
4 Secondary buffer
5 Strength member
6 Outer jacket
Figure 1 — Cable construction
Table 1 — Cable dimensional information
Property Value
Core d
...