FprEN 4641-301

SLOVENSKI STANDARD
oSIST prEN 4641-301:2022
01-september-2022
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: prEN 4641-301
ICS:
29.060.20 Kabli Cables
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
oSIST prEN 4641-301:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4641-301:2022
oSIST prEN 4641-301:2022
DRAFT
EUROPEAN STANDARD
prEN 4641-301
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2022
ICS 49.090
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 : Mantelaußendurchmesser 125 µm - Teil 301: Fester
Câble à structure serrée, fibre à gradient d'indice Aufbau, 50/125 µm GI-Faser, Kabelaußendurchmesser
50/125 µm, diamètre extérieur 1,8 mm - Norme de 1,8 mm - Produktnorm
produit
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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4641-301:2022 E
worldwide for CEN national Members.

oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 4
5 Cable construction . 5
6 Materials . 6
7 Test methods and performances . 7
7.1 Tests in accordance with EN 3745-100 . 7
7.1.1 Optical fibre . 7
7.1.2 Fibre optic cable . 8
7.2 Fluid test. 14
8 Tooling . 15
9 Quality assurance . 15
10 Designation and marking . 15
10.1 General principle of designation . 15
10.2 Marking . 15
10.3 Colours . 15
11 Delivery conditions . 15
11.1 Packaging . 15
11.2 Labelling . 15
11.3 Delivery lengths. 15
12 Storage . 16
13 Technical specification . 16
Bibliography . 17

oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
European foreword
This document (prEN 4641-301:2022) 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 4641-301:2022
prEN 4641-301:2022 (E)
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
1),
EN 3745 (all parts), Aerospace series — Fibres and cables, optical, aircraft use — Test methods
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 terminological 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.

1)
All parts quoted in this document
oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
5 Cable construction
See 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 diameter (50 ± 3,0) µm
Cladding diameter (125 ± 2,0) µm
Core/cladding concentricity ≤ 3 µm
Core non circularity ≤ 5 %
Cladding non circularity ≤ 2 %
Primary buffer (245 ± 15) µm
Attenuation at 850 nm (+ 20 °C) ≤ 5 dB/km
Attenuation at 1 300 nm (+ 20 °C) ≤ 3 dB/km
Finished cable diameter (1,80 ± 0,1) mm
Cable mass ≤ 5 kg/km
Operating temperature −60 °C to 135 °C
Installation: 18 mm
Minimum bend radius (+ 20 °C) Long term: 18 mm
Storage: 36 mm
Strength member weave pitch 3 mm ≤ p ≤ 20 mm
Tensile strength > 200 N
oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
6 Materials
See Table 2.
Table 2 — Cable materials
Element Material
Core
Fibre Silica
Cladding
Primary buffer Polyacrylate
Secondary buffer Polymer
Mechanical strength reinforcement Aramid/aramid-fibre glass woven braid
Jacket(s) Polymer
oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
7 Test methods and performances
7.1 Tests in accordance with EN 3745-100
7.1.1 Optical fibre
See Table 3.
Table 3 — Optical fibre performance requirements
Test method
Designation of the test Test conditions and results
EN 3745-
201 Visual examination Pass
202 Fibre core dimensions Method A: Core diameter = (50 ± 3) µm
501 Optical fibre proof test > 1 %
Cladding diameter: (125 ± 2) µm
Method A or B
202 Fibre cladding dimension
Sample should be in accordance with test methods
Number of sample: 1
Primary coating outside
203 Not applicable
diameter
Fibre dimension core non- Core non circularity : ≤ 5 % (3 µm)
circularity Number of sample: 1
Fibre dimension cladding Cladding non-circularity : ≤ 2 % (2,5 µm)
Non-circularity Number of sample: 1
Concentricity error: ≤ 3 µm
Fibre dimension
concentricity error
Number of sample: 1
Numerical aperture:
(0,2 ± 0,015) at λ = (850 ± 20) nm
302 Numerical aperture
Number of sample: 2
Bandwidth ≥ 500 MHz/km at 850 nm
Bandwidth ≥ 500 MHz/km at 1 300 nm
Central wavelengths: (850 ± 10) nm,
(1 300 ± 10) nm
303 Bandwidth
Spectral width (−3 dB): ≤ 10 nm for 850 nm
Number of sample: 1
Minimum sample length: 1 km
oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
7.1.2 Fibre optic cable
Fibre optic cable performance requirements.
See Table 4.
Table 4 — Fibre optic cable performance requirements
Test method
Designation of the test Test conditions and results
EN 3745-
The outer jacket shall have the correct
identification as specified in this standard.
The outer jacket shall be continuous and free of
visible defects such as lumps, abrasions, cracks,
201 Visual examination
splits or blisters
Number of sample: 1
Sample length: 3 m
203 Buffer diameter (900 ± 50) µm
Outer jacket outside
203 (1,80 ± 0,1) mm
diameter
Visual examination in accordance with
EN 3745-201
Outer jacket shrinkage or elongation: ≤ 3,5 mm
Secondary buffer shrinkage or
elongation: ≤ 1,5 mm
Number of temperature cycles (EN 3745-402):
205 Longitudinal stability
High temperature: 135 °C − Low Temperature:
−60 °C, Duration at extreme temperatures:
30 min
Rate of change: 5 °C per min
Number of sample: 1
Sample length: (20 ± 0,1) m
Max. attenuation (at 20°C): ≤ 5,0 dB/km at
850 nm
Cable Attenuation
≤ 3,0 dB/km at 1 300 nm
Method D
Minimum sample length: ≥ 100 m
Note: This test is extremely unlikely to produce
failing results for any fibre optic cable that
utilizes a black or other opaque coloured jacket,
but cable failure may occur when transparent or
translucent jackets are employed“. TIA
Cable immunity to
EIA 455-22-B Figure 2
ambient light
(−55 dBm).
Level of optical power: ≤ −55 dBm
Diameter of the integration sphere:
(10 ± 0,1) cm
Spectral characteristics or colour temperature
oSIST prEN 4641-301:2022
prEN 4641-301:2022 (E)
of the light source: solar spectrum
Continuous spectrum between 250 nm and
1 600 nm
Light temperature: 6 000 K
Light intensity: 86 400 Lux
Minimum authorized long-term bend radius:
(20 ± 0,1) mm
Number of sample: 2
Sample length exposed to light source:
(10 ± 0,1) m
Visual examination in accordance with
EN 3745-201
Maximum variation of attenuation during the
test: ≤ 0,25 dB at 850 nm
Maximum variation of attenuation at t
...