SIST EN 50411-2-4:2022
(Main)Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications - Part 2-4: Sealed dome fibre splice closures for category S & A
Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications - Part 2-4: Sealed dome fibre splice closures for category S & A
1.1 Product definition
This document contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements of a fully installed splice closure in order for it to be categorized as a European Standard product.
1.2 Operating environment
The tests selected combined with the severity and duration are representative of an outside plant for subterranean and/or aerial environments defined by:
EN IEC 61753 1 category S: subterranean environment
category A: aerial environment
1.3 Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this specification does not guarantee the reliability of the product. This is predicted using a recognized reliability assessment programme.
1.4 Quality assurance
Compliance with this specification does not guarantee the manufacturing consistency of the product. This is maintained using a recognized quality assurance programme.
1.5 Allowed fibre and cable types
This closure standard allows both single-mode and multi-mode fibre to be used and covers all IEC standard optical fibre cables with their various fibre capacities, types and designs. This includes, but is not limited to, optical fibre cable standards EN 60794 2 (indoor) and EN 60794 3 (outdoor).
The optical performance tests are carried out on test samples with EN IEC 60793 2 50 single-mode fibre (see Annex A). The selected fibre type for the optical test samples depends on the design of the fibre management system.
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen - Produktnormen - Teil 2-4: LWL-Muffen Bauart 1 mit abgedichteter Haube für die Kategorien S und A
1.1 Produktdefinition
Dieses Dokument enthält die Anfangs- und Maßanforderungen zu Beginn der Lebensdauer sowie die
optischen, mechanischen und umweltbezogenen Betriebsverhaltensanforderungen an eine vollständig
installierte Spleißmuffe, damit sie als ein europäisches Normprodukt eingestuft werden kann.
1.2 Betriebsumgebung
Die ausgewählten Prüfungen in Kombination mit der Prüfschärfe und der Dauer sind repräsentativ für eine
Außenanlage mit unterirdischer und/oder Luftumgebungen, die definiert sind in:
EN IEC 61753-1:2018 Kategorie S: unterirdische Umgebung
Kategorie A: Umgebung in Luft
1.3 Zuverlässigkeit
Die erwartete Betriebslebensdauer des Produkts in dieser Umgebung beträgt 20 Jahre, wobei die Einhaltung
dieser Norm die Zuverlässigkeit des Produktes nicht sichergestellt. Diese sollte unter Verwendung eines
anerkannten Programms zur Bewertung der Zuverlässigkeit vorausgesagt werden.
1.4 Qualitätssicherung
Die Einhaltung dieser Norm stellt nicht die Gleichmäßigkeit bei der Fertigung des Produktes sicher. Diese
sollte unter Verwendung eines anerkannten Qualitätssicherungsprogramms aufrechterhalten werden.
1.5 Zulässige Faser- und Kabeltypen
Obwohl die Prüfungen der Gebrauchseigenschaften an Prüflingen mit nicht dispersionsverschobener Faser
nach EN 60793-2-50, B1.3 (siehe Anhang A) durchgeführt wird, ist die einmal nach dieser europäischen
Norm geprüfte Muffe auch für andere Fasertypen geeignet, z. B. für nulldispersionsverschobene, nichtnulldispersionsverschobene
sowie für Mehrmodenfasern.
Diese Muffennorm ermöglicht sowohl die Verwendung von Einmoden- als auch Mehrmoden-Lichtwellenleitern
und deckt die Lichtwellenleiterkabel aller IEC-Normen mit ihren unterschiedlichen LWL-Aufnahmekapazitäten,
Kabeltypen und -Ausführungen ab. Dies schließt unter anderem die Normen für LWL-Kabel
EN 60794-2 (Innenkabel) und EN 60794-3 (Außenkabel) ein.
Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par fibres optiques - Spécifications de produits - Partie 2-4: Boîtiers à épissure de fibres sous dôme scellés Type 1, pour catégories S & A
1.1 Définition du produit
Le présent document contient les exigences de performances initiales, de début de vie, dimensionnelles, optiques, mécaniques et environnementales d’un boîtier à épissure entièrement installé, afin d’être classé comme produit couvert par une Norme européenne.
1.2 Environnement de fonctionnement
Les essais choisis, combinés avec les sévérités et les durées, sont représentatifs d’une installation extérieure pour les environnements souterrains et/ou aériens définis par les normes suivantes:
EN IEC 61753 1 catégorie S: environnement souterrain
catégorie A: environnement aérien
1.3 Fiabilité
Bien que l’espérance de vie en service prévue du produit dans cet environnement soit de 20 ans, la conformité à cette spécification ne garantit pas la fiabilité du produit. Celle-ci est estimée en utilisant un programme reconnu d’évaluation de la fiabilité.
1.4 Assurance de la qualité
La conformité à la présente spécification ne garantit pas la cohérence de fabrication du produit. Elle est maintenue en utilisant un programme reconnu d’assurance qualité.
1.5 Types de fibres et câbles autorisés
La présente norme de boîtier permet d’utiliser tant la fibre unimodale que la fibre multimodale et couvre tous les câbles à fibres optiques des normes IEC avec leurs différents types, capacités et conceptions de fibres. Cela inclut notamment les normes de câbles à fibres optiques EN 60794 2 (intérieurs), EN 60794 3 (extérieurs).
Les essais de performance optique sont effectués sur des échantillons d’essais avec des fibres unimodales selon l’EN IEC 60793 2 50 (voir Annexe A). Le type de fibre choisi pour les échantillons d’essais optiques dépend de la conception du système de gestion des fibres.
Sistemi za upravljanje z optičnimi vlakni in zaščitna ohišja za optične komunikacijske sisteme - Specifikacije proizvoda - 2-4. del: Okrovi optičnih spojnic z zatesnjenimi pokrovi za kategorijo S&A
Ta dokument določa tehnične lastnosti in merilne metode za radiodifuzijske zvočne sprejemnike z demodulacijo DRM.
OPOMBA: Razmerje med tem dokumentom in bistvenimi zahtevami člena 3.2 Direktive 2014/53/EU [i.1] je podano v dodatku A.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2022
Nadomešča:
SIST EN 50411-2-4:2012
Sistemi za upravljanje z optičnimi vlakni in zaščitna ohišja za optične
komunikacijske sisteme - Specifikacije proizvoda - 2-4. del: Okrovi optičnih
spojnic z zatesnjenimi pokrovi za kategorijo S&A
Fibre management systems and protective housings to be used in optical fibre
communication systems - Product specifications - Part 2-4: Sealed dome fibre splice
closures for category S & A
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen
- Produktnormen - Teil 2-4: LWL-Muffen Bauart 1 mit abgedichteter Haube für die
Kategorien S und A
Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par
fibres optiques - Spécifications de produits - Partie 2-4: Boîtiers à épissure de fibres sous
dôme scellés Type 1, pour catégories S & A
Ta slovenski standard je istoveten z: EN 50411-2-4:2021
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50411-2-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2021
ICS 33.180.20 Supersedes EN 50411-2-4:2012 and all of its
amendments and corrigenda (if any)
English Version
Fibre management systems and protective housings to be used
in optical fibre communication systems - Product specifications -
Part 2-4: Sealed dome fibre splice closures for category S & A
Organiseurs et boîtiers de fibres à utiliser dans les LWL-Spleißkassetten und -Muffen für die Anwendung in
systèmes de communication par fibres optiques - LWL-Kommunikationssystemen - Produktnormen - Teil 2-4:
Spécifications de produits - Partie 2-4: Boîtiers à épissure LWL-Muffen Bauart 1 mit abgedichteter Haube für die
de fibres sous dôme scellés Type 1, pour catégories S & A Kategorien S und A
This European Standard was approved by CENELEC on 2021-08-09. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50411-2-4:2021 E
Contents Page
European foreword .4
1 Scope .6
1.1 Product definition .6
1.2 Operating environment .6
1.3 Reliability .6
1.4 Quality assurance .6
1.5 Allowed fibre and cable types .6
2 Normative references .6
3 Terms and definitions .8
4 Description . 11
4.1 Closure housing . 11
4.2 Cable seals . 12
4.3 Fibre management system . 13
5 General requirements . 13
5.1 Materials . 13
5.2 Storage, transportation and packaging . 13
5.3 Installation and intervention . 13
5.4 Closure overpressure safety . 14
5.5 Colour and marking . 14
6 Variants . 14
7 Dimensional requirements . 18
7.1 Dimensions of closures for Multiple Element and Multiple Ribbon fibres . 18
7.2 Dimensions of closures for Single Circuit, Single Element and Single Ribbon . 19
8 Tests . 20
8.1 Sample size . 20
8.2 Test sample preparation . 20
8.3 Test and measurement methods . 25
8.4 Test sequence . 25
8.5 Pass/fail criteria . 25
9 Test report . 25
10 Performance requirements . 26
10.1 Dimensional and marking requirements . 26
10.2 Sealing, optical and visual examination pass/fail criteria . 26
10.3 Sealing performance requirements . 27
10.4 Optical performance requirements . 32
Annex A (normative) Fibre for test sample details . 36
A.1 Fibre type for test sample . 36
Annex B (normative) Sample size and product sourcing requirements . 38
Annex C (informative) Families of FMS covered in this standard . 40
Annex D (informative) Dimensions of FMS for multiple element and multiple ribbon . 43
Annex E (informative) Dimensions of S type FMS for Single Circuit, Single Element and
Single Ribbon . 44
Bibliography . 46
European foreword
This document (EN 50411-2-4:2021) has been prepared by CLC/TC 86BXA, “Fibre optic interconnect,
passive and connectorised components”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2022-05-26
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2024-11-26
conflicting with this document have to be
withdrawn
This document supersedes EN 50411-2-4:2012 and all of its amendments and corrigenda (if any).
EN 50411-2-4:2012:
— reference EN IEC 61756-1 is added;
— terms and definitions are added;
— harmonized general requirements with the EN IEC 61753-111 series;
— the IEC 61753-1:2007 categories A and S tests and test severities are replaced by the
IEC 61753-1:2018 categories A and S tests and test severities;
— maximum single circuit splice capacity of size E closure reduced from 84 splices to 72 splices;
— variant XX (FMS designed for fibre type) added;
— test pressure for category A changed to 20 kPa overpressure;
— reduced loads in cable retention test for small diameter cables and tubes;
— axial compression test of cables is added;
— number of assembly and disassembly cycles reduced to 5 cycles;
— resistance to solvents and contaminating fluids for category S has changed. The duration of the
immersion in diesel became 1 h and the drying time 24 h. Immersion in kerosene is removed;
— duration of the change of temperature reduced to 12 cycles;
— the test “resistance to shot gun blasts” test is removed;
— fibre type B-567 added for test sample.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Fibre management systems and protective housings to be used in optical fibre communication systems –
Product specifications
Part 2–4: Sealed dome fibre splice closures for category S and A
Description Performance
Construction: Sealed dome ended Applications:
Cable seals: Heat activated and or cold applied Optical fibre cable networks
Fibre management: Single Circuit, Single Element, — for underground (EN IEC 61753-1 category S);
Multiple Element and/or
— for aerial (EN IEC 61753-1 category A).
Single/Multiple Ribbon
Related documents:
EN IEC 60793-2-50, Optical fibres – Part 2–50: Product specifications – Sectional specification for class B single-
mode fibres (IEC 60793-2-50)
EN 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification (IEC 60794-2)
EN 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification (IEC 60794-3)
EN IEC 61753-1, Fibre optic interconnecting devices and passive components - Performance standard – Part 1:
General and guidance (IEC 61753-1)
EN IEC 61756-1, Fibre optic interconnecting devices and passive components - Interface standard for fibre
management systems - Part 1: General and guidance (IEC 61756-1)
EN 61300 series, Fibre optic interconnecting devices and passive components – Basic test and measurement
procedures (IEC 61300 series)
ETSI EN 300 019, Environmental Engineering (EE) - Environmental conditions and environmental tests for
telecommunications equipment
Construction and sizes: Maximum splice capacity depending closure size and
fibre circuit separation level
Size S type FMS M type FMS
Single Single Single Multiple Multiple
Circuit Element Ribbon Element Ribbon
(SC) (SE) (SR) (ME) (MR)
A - - - 72 -
splices
B 12 72 48 96 -
splices splices splices splices
C
24 144 72 144 -
splices splices splices splices
D 48 288 144 576 -
splices splices splices splices
E 72 216 144 - -
splices splices splices
F 144 432 288 - -
splices splices splices
G 192 624 384 - 288
splices splices splices splices
H 240 864 432 - 1 152
splices splices splices splices
1 Scope
1.1 Product definition
This document contains the initial, start of life dimensional, optical, mechanical and environmental
performance requirements of a fully installed splice closure in order for it to be categorized as a
European Standard product.
1.2 Operating environment
The tests selected combined with the severity and duration are representative of an outside plant for
subterranean and/or aerial environments defined by:
EN IEC 61753-1 category S: subterranean environment
category A: aerial environment
1.3 Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance
with this specification does not guarantee the reliability of the product. This is predicted using a
recognized reliability assessment programme.
1.4 Quality assurance
Compliance with this specification does not guarantee the manufacturing consistency of the product.
This is maintained using a recognized quality assurance programme.
1.5 Allowed fibre and cable types
This closure standard allows both single-mode and multi-mode fibre to be used and covers all IEC
standard optical fibre cables with their various fibre capacities, types and designs. This includes, but is
not limited to, optical fibre cable standards EN 60794-2 (indoor) and EN 60794-3 (outdoor).
The optical performance tests are carried out on test samples with EN IEC 60793-2-50 single-mode
fibre (see Annex A). The selected fibre type for the optical test samples depends on the design of the
fibre management system.
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 60068-2-10, Environmental testing - Part 2-10: Tests - Test J and guidance: Mould growth (IEC
60068-2-10)
EN IEC 60793-2-50, Optical fibres - Part 2-50: Product specifications - Sectional specification for class
B single-mode fibres (IEC 60793-2-50)
EN 61300-1, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 1: General and guidance (IEC 61300-1)
EN 61300-2-1, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-1: Tests - Vibration (sinusoidal) (IEC 61300-2-1)
EN IEC 61300-2-4, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-4: Tests – Fibre or cable retention (IEC 61300-2-4)
EN 61300-2-5, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-5: Tests – Torsion (IEC 61300-2-5)
EN 61300-2-9, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-9: Tests – Shock (IEC 61300-2-9)
EN 61300-2-10, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-10: Tests - Crush resistance (IEC 61300-2-10)
EN 61300-2-11, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-11: Tests - Axial compression (IEC 61300-2-11)
EN 61300-2-12, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures — Part 2-12: Tests — Impact (IEC 61300-2-12)
EN 61300-2-22, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-22: Tests - Change of temperature (IEC 61300-2-22)
EN 61300-2-23, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-23: Tests - Sealing for non-pressurized closures of fibre optic devices
(IEC 61300-2-23)
EN 61300-2-26, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-26: Tests - Salt mist (IEC 61300-2-26)
EN 61300-2-33, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-33: Tests - Assembly and disassembly of fibre optic mechanical
splices, fibre management systems and closures (IEC 61300-2-33)
EN 61300-2-34, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-34: Tests - Resistance to solvents and contaminating fluids of
interconnecting components and closures (IEC 61300-2-34)
EN 61300-2-37, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-37: Tests - Cable bending for fibre optic closures (IEC 61300-2-37)
EN 61300-2-38, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-38: Tests - Sealing for pressurized fibre optic closures (IEC 61300-
2-38)
EN 61300-3-1, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-1: Examinations and measurements - Visual examination (IEC 61300-
3-1)
EN 61300-3-3, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-3: Examinations and measurements - Active monitoring of changes
in attenuation and return loss (IEC 61300-3-3)
EN 61300-3-28, Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-28: Examinations and measurements - Transient loss (IEC 61300-3-
28)
EN ISO 4892-3, Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV
lamps (ISO 4892-3)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain
terminological 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
3.1
excursion loss
change in optical attenuation during the slow variations of environmental parameters
Note 1 to entry: Excursion loss is the ± deviation from the original value of the transmitted power at the start of
the test.
3.2
fibre management system
FMS
system to control, protect and store splices, connectors, passive optical components and fibres from
incoming to outgoing cables
Note 1 to entry: A fibre management system is intended for installation within a protective housing.
Note 2 to entry: A fibre management system is often called an “organiser”.
[SOURCE: EN IEC 61756-1]
3.3
fibre splice
permanent or separable joint whose purpose is to couple optical power between two optical fibres,
achieved by either a fusion or a mechanical technique
[SOURCE: IEV 731-05-05, modified]
3.4
intervention
gain access to modify, add, remove or repair fibre circuits, splices, connectors or other components
between the incoming and outgoing cables of an existing closure
3.5
installation
all activities and handling operations to establish and install a protective housing including the cables or
by adding new circuits, splices, connectors and other components
3.6
installation conditions
circumstances that must be fulfilled for an installation, which includes; environmental conditions, size
interface between the closure or enclosure and the fibre management system, optical performance,
additional/special conditions and safety requirements
3.7
live fibre
fibre optical circuit that is carrying an optical signal
[SOURCE: EN IEC 61756-1]
3.8
multiple element
ME
physical separation level consisting of more than one single element
Note 1 to entry: This separation level implies fibres from multiple cable elements on one splice tray (also called
mass storage) and constitutes the lowest degree of circuit physical separation.
[SOURCE: EN IEC 61756-1]
3.9
multiple ribbon
MR
multiple element consisting of multiple optical fibres (circuits) arranged in ribbons (fibres in parallel)
which are also arranged (for example, in stacks)
[SOURCE: EN IEC 61756-1]
3.10
optical time domain reflectometer
OTDR
device for characterizing an optical fibre whereby an optical pulse is transmitted through the optical fibre
and the optical power of the resulting light scattered and reflected back to the input is measured as a
function of time
Note 1 to entry: Useful in estimating attenuation coefficient for uniform fibres, and identifying and localizing
defects and localized losses.
[SOURCE: IEV 731-07-08]
3.11
protective housings
all indoor and outdoor housings utilised for the storage, distribution or protection of one or more cable
joints or any passive or active telecom equipment
Note 1 to entry: Examples of protective housings: wall boxes, cabinets, cases, optical distribution frame sub
racks, closures or pedestals. A closure can be either a “sealed closure” or a “free breathing closure”.
Note 2 to entry: The protective housing contains a fibre management system.
[SOURCE: EN IEC 61753-1]
3.12
sealed closure
watertight and dust-tight housing that can hold a varying overpressure or underpressure caused by
temperature changes or atmospheric pressure changes
Note 1 to entry: There is no exchange of air with the outside environment when exposed to temperatures over
the specified operating temperature range.
Note 2 to entry: Although often referred to as hermetic sealed closures, humidity can enter the inner closure by
diffusion.
Note 3 to entry: Completely inner filled housings are also considered to be sealed closures.
[SOURCE: EN IEC 61753-1]
3.13
single circuit
SC
physical fibre separation level where the optical circuit consists of one fibre (single fibre), or more than
one fibre, providing all services for one subscriber
Note 1 to entry: This fibre separation level has the fibre(s) of only one customer on one splice tray. It is the highest
(best) degree of physical circuit separation.
[SOURCE: EN IEC 61756-1]
3.14
single element
SE
physical separation level with a cable subassembly comprising one or more optical fibres inside a
common covering e.g. a tube or inside one groove of a grooved cable (slotted core cable)
Note 1 to entry: A single element provides more than one termination or circuit.
Note 2 to entry: A fibre ribbon is a single element.
Note 3 to entry: This fibre separation level has all fibres from a cable element (e.g. loose tube) on one splice tray.
It is an intermediate degree of physical circuit separation (between single circuit and multiple element).
[SOURCE: EN IEC 61756-1]
3.15
single ribbon
SR
single element designed to carry all fibres of one ribbon
Note 1 to entry: Depending on the fibres deployment’, a single ribbon can contain all the fibres of one circuit
(single circuit) or the fibres of more than one circuit (single element).
[SOURCE: EN IEC 61756-1]
3.16
splice tray
structure that organises and controls storage of fibre splices in an orderly manner, together with the
associated excess uncabled fibre length
Note 1 to entry: It can be a part of a fibre management system.
[SOURCE: EN IEC 61756-1]
3.17
transient loss
short term (ms) reversible change of optical transmission characteristics arising from optical
discontinuity, physical defects and modifications of the attenuation (e.g. bending loss) normally caused
by mechanical stress
[SOURCE: EN 61300-3-28]
3.18
uncut fibre
fibres from a continuous cable with the cable sheath removed over a defined length without cutting the
fibres or tubes
Note 1 to entry: The uncut tubes or fibres are stored e.g. in a space saving loop. When required, the fibres are cut
and spliced or connected.
[SOURCE: EN IEC 61756-1]
4 Description
4.1 Closure housing
An optical fibre closure comprises a sealed closure housing that is attached to the ends of the joined
cable sheaths and a fibre management system for containing and protecting the fibres, splices and other
passive optical devices.
This is not to be confused with an optical fibre closure for blowing cable or fibre. This comprises a
protective housing that allows the interconnection of cable ducts or tubes and is attached to the ends of
the ducts or cables containing empty tubes. However, this document shall be used when air blown fibres
are spliced inside this type of closure.
The design of the closure housing shall allow the jointing of two or more cable ends in the following
configurations or applications:
— Track joint configuration (see Figure 1) used to interconnect at least two cables (example: drop
cable repair closure);
Key
1 cable
2 closure
Figure 1 — Track joint configuration
— Spur joint configuration (see Figure 2) used to split one cable into at least 2 smaller cables;
Key
1 cable
2 closure
Figure 2 — Spur joint configuration
— Distribution joint configuration (see Figure 3) used on customer feed cable with minimum of 6
cable entries (D1), 10 cable entries (D2), 18 cable entries (D3), 34 cable entries (D4) or 66 cable
entries (D5).
Key
1 cable
2 closure
3 uncut fibres
4 drop cable(s)
Figure 3 — Distribution joint configuration
The design of the distribution and spur joint closure housing shall allow the joining together of at least
one pair of cables which are not at the end of a cable section, without cutting all fibres between both
cable openings. This application is generally known as distribution joint or external node, but also called
a mid-span closure or balloon splice.
It is desirable that the closure can be re-opened when necessary without interruption or disturbance of
the traffic of the live circuits.
4.2 Cable seals
Cable entry seal systems can be either, but not limed to:
— Dedicated heat activated heat source, for example, electrical, infrared, hot air or flame
— thermo-shrinkable materials;
— hot melt adhesives;
— polyethylene injection welding.
— Dedicated cold applied
— mastic, tapes, pastes, potting compounds, gels and cold adhesives;
— o-rings, grommets, rubber shapes, pre-expanded tubing are cold processes.
— Combined heat activated and cold applied.
4.3 Fibre management system
The splice closure contains a fibre management system as described in EN IEC 61756-1. The fibre
management system provides means for routing, storing and protecting of fibre splices or other passive
optical devices in a predetermined order, between one cable sheath opening to another.
Fibres may be separated to an appropriate separation level SC, SE, SR, ME or MR. This will limit the
risk of interruption to traffic in those fibres belonging to other groups of circuits.
NOTE The families of fibre management systems covered in this document are listed in Annex C.
5 General requirements
5.1 Materials
All materials that are likely to come in contact with personnel shall meet appropriate health and safety
regulations.
Closure and sealing materials shall be compatible with each other and with the cable materials.
All closure components shall be resistant to solvents and degreasing agents typically used to clean and
degrease fibres and cables.
The effect of UV light on all polymeric materials that are directly exposed to the environment, shall not
adversely affect the product’s performance. UV test shall be according to EN ISO 4892-3 lamp type 1A
(UVA-340), cycle 1, duration 2 160 h. The effect of UV light shall be determined by measuring a suitable
property (e.g. tensile strength at yield and elongation at yield) both before and after exposure of the
material slabs. The average change in mechanical characteristics of the tested material slabs shall be
less than 20 %.
Polymeric materials shall not support mould growth causing mechanical degradation of the materials.
Mould growth shall be tested according to EN 60068-2-10. The effect of mould growth shall be
determined by measuring a suitable property (e.g. tensile strength at yield and elongation at yield) both
before and after exposure of the material slabs. The average change in mechanical characteristics of
the tested material slabs shall be less than 20 %.
Metallic parts shall be resistant to corrosive influences encountered during the lifetime of the product.
5.2 Storage, transportation and packaging
The classes of environmental conditions and their severities to which closures may be exposed during
storage and transportation are defined in ETSI EN 300 019-2-1 and ETSI EN 300 019-2-2.
The product, in its original packaging, shall be suitable for normal public or commercial transportation
and storage in weather protected non-temperature-controlled storage environments and after
installation meet the requirements as specified in Clause 10.
5.3 Installation and intervention
The minimum and maximum temperatures at which a closure can be installed (installation conditions)
or re-entered (intervention), are not necessarily equal to the maximum temperature excursion of the
environment in which it will reside, once installed. Accessing fibres and the fibre management system
inside the closure is typically done in a more controlled environment. Closures and the fibre
management system should be installable in the temperature range between –5 °C and +45 °C. Closure
and cable handling alone should be possible at temperatures between –15 °C and +45 °C.
5.4 Closure overpressure safety
Overpressure can build up in sealed closures due to temperature differentials, or due to atmospheric
pressure changes over a period of time, or due to flash testing of the seals after installation, or due to
incorrect installation techniques. Care should be taken when opening a sealed closure. Provisions shall
be made that overpressure is exhausted when opening the closure prior to complete removal of the
cover.
For air blown fibre applications an overpressure release system is required for all sealed closures.
5.5 Colour and marking
Marking/identification of the ‘variant number’ (see Clause 6) to be on the product or packaging label
along with the following:
— identification of manufacturer;
— manufacturing date code: year / month;
— expiry date (at least year) if the product contains components with a limited shelf-life.
The preferred colour for the outer closure material is black for polymeric materials.
6 Variants
Table 1 — Sealed dome fibre splice closure Type 1, for category S - Variants
EN 50411-2–4 – X1 – XX2 – X3 – XX4 – XX5 – X6 – XX7
Variant No.
Operating environment
X
S Subterranean environment
A Aerial environment
B Both subterranean and aerial environments
Variant No.
Closure application – number of cables
XX
T1 Track closure (2 cables minimum)
S1 Spur closure (3 cables minimum)
D1 Distribution (6 cables minimum)
D2 Distribution (10 cables minimum)
D3 Distribution (18 cables minimum)
D4 Distribution (34 cables minimum)
D5 Distribution (66 cables minimum)
Variant No.
Cable sealing technology
X
R Cold applied
H Heat activated (heat source required)
U Universal, both methods in a single cable entry base
Variant No.
Fibre circuit separation level
XX
SC Single Circuit (2 fibres per splice tray)
S types
SE Single Element (12 fibres per splice tray)
SR Single Ribbon (one 12 fibre ribbon per splice tray)
ME Multiple Element (24 fibres per splice tray)
M types
MR Multiple Ribbon (144 fibres per splice tray)
NOTE in some cases an M type splice tray can be used as SC or SE type splice tray (by reducing number of
stored splices per tray)
Depending on the selection of the circuit separation level XX , refer to one of the following Tables 2, 3,
(number of required splice trays) and X (closure size):
4, 5 and 6 to find XX5 6
Table 2 — SC splice tray and closure selection
XX →
06 12 18 24 30 36 42 48 54 60 66 72 96 120
SC trays
Maximum
splice 12 24 36 48 60 72 84 96 108 120 132 144 192 240
capacity
Size X
B
C
D
E
F
G
H
NOTE An SC tray contains 2 fibre splices per tray.
Table 3 — SE splice tray and closure selection
XX →
01 02 03 04 05 06 07 08 12 16 18 24 36 42 48 52 60 72
SE tray
Maximum
splice 12 24 36 48 60 72 84 96 144 192 216 288 432 504 576 624 720 864
capacity
Size X6
B
C
D
E
F
G
H
NOTE An SE tray contains 12 fibre splices per tray.
Table 4 — SR splice tray and closure selection
XX →
2 4 5 6 7 8 9 10 12 16 18 24 36
SR tray
Maximum
splice 24 48 60 72 84 96 108 120 144 192 216 288 432
capacity
Size X
B
C
D
E
F
H
NOTE 1 An SR tray has minimum 1 ribbon splice per tray.
NOTE 2 A ribbon has 12 fibres. When using ribbons with a fibre count other than 12 fibres per ribbon the
maximum splice capacity should be changed accordingly.
Table 5 — ME splice tray and closure selection
XX →
1A 2A 3A 1B 2B 3B 4B 5B 6B 1D 2D 3D 4D 5D 6D 7D 8D
ME tray
Maximum
splice 24 48 72 24 48 72 96 120 144 72 144 216 288 360 432 504 576
capacity
Size X
A
B
C
D
NOTE 1 ME- Size A and ME- Size B trays have a minimum of 24 splices per tray.
NOTE 2 ME- Size D trays have a minimum of 144 splices per tray.
Table 6 — MR splice tray and closure selection
XX →
1D 2D 3D 4D 6D 8D 1H 2H 3H 4H 5H 6H 7H 8H
MR tray
Maximum
splice
36 72 108 144 216 288 144 288 432 576 720 864 1 008 1 152
capacity
Size X
G
H
NOTE 1 MR- Size D trays have a minimum of 3 ribbon splices per tray.
NOTE 2 MR- Size H trays have a minimum of 12 ribbon splices per tray.
NOTE 3 A ribbon has 12 fibres. When using ribbons with a fibre count other than 12 fibres per ribbon the
maximum splice capacity should be changed accordingly.
Variant No.
FMS designed for storage of fibre type
XX
AF All fibre types B-652.D and B-657.A
A1 Only for B-657.A1, A2, B2 and B3
A2 Only for B-657-A2, B2 and B3
This product specification concerns fibre management systems of only one type at a given fibre
separation level in parameter XX . If multiple types of FMS in a single closure are required, typically
double the number of SC trays can be inserted in the same envelope as SE.
Therefore
Maximum splice capacity ≥ 2 * (number of SC trays) + 12 * (number of SE trays)
EXAMPLES
EN 50411-2-4 – S – D2 – H – SC – 06 – E – A2
Distribution 10 cable minimum closure, for underground application with heat activated cable seals, SC fibre
management system with 6 SC trays (12 splices) in a size E closure. FMS designed for storage of B-657.A2 fibres.
EN 50411-2-4 – A – T1 – C – MR – 4D – G – AF
A track 2 cable minimum joint closure, for aerial application with cold applied cable seals and MR fibre management
with 4 splice trays type MR-D in a size G closure. FMS designed for storage of all B-652.D and B-657.A fibre types.
7 Dimensional requirements
7.1 Dimensions of closures for Multiple Element and Multiple Ribbon fibres
The outline dimensions of the M closures (see Figure 4) with splice trays for multiple element and
multiple ribbon fibres are given in Table 7.
a)
b)
Figure 4 — Outline dimensions of M closure
Table 7 — M closure dimensions
Closure with M type FMS
Outline M type closure envelope
Maximum number of fibre splices
dimensions (in mm)
per closure
(Maximum values)
Closure
size
Overall Overall Overall
Multiple
Multiple Ribbon length diameter diameter
Element
E F1 F2
A 72 505
185 265
B 96
NA 600
C 144
270 312
D 576 750
G 288 800
NA 275 310
H 1 152 1 050
NOTE Additional information on the fibre management system can be found in Annex D.
7.2 Dimensions of closures for Single Circuit, Single Element and Single Ribbon
The outline dimensions of S closures (see Figure 5) with splice trays for single circuit, single element
and single ribbon fibres are given in Table 8.
Key
1 size B 5 size F
2 size C 6 size G
3 size D 7 size H
4 size E
Figure 5 — Outline dimensions of S closures
Table 8 — S closure dimensions with SC, SE and SR splice trays
Closure with S type FMS
Outline S type closure envelope
dimensions
Maximum number of fibre splices
(Maximum values)
Closure
size Overall Overall Overall
Single Single Single length diameter diameter
Circuit Element Ribbon mm mm mm
E F1 F2
a
B 12 72 48 185 265
Single
a
C 24 144 72
stack
270 312
a
D 48 288 144 750
E 72 216 144 540
F 144 432 288 620
Double
275 310
stacks
G 192 624 384 800
H 240 864 432 1 050
NOTE Additional information on the fibre management system can be found in Annex E.
a
Closures B, C and D can also contain M type splice trays.
8 Tests
8.1 Sample size
Separate test samples for sealing performance and optical evaluation may be used. For the purposes
of this standard, a sealing performance test sample is defined as a closure installed with several cable
ends.
Optical test samples shall be constructed as described in 8.2. Due to their complexity, consecutive
testing on the same optical sample is allowed.
The minimum recommended sample sizes are given in Annex B.
8.2 Test sample preparation
Sealing performance test samples shall be provided with an air pressure test access valve. The length
of each cable extending from the closure shall be long enough to perform the tests (typical cable length
for sealing test samples is 1 m). The open ends of the cables shall be sealed with a cap. Each applicable
cable type with minimum and maximum cable dimensions shall be represented in the test program.
Optical test samples shall be constructed in such a way that they will cover all allowed functions of a
track/spur joint and/or distribution joint. This shall be achieved by building optical circuits for each fibre
separation level (typically SC, SE, SR, ME and MR splicing and uncut fibre storage). The fibres for the
optical test samples depend on the design of the FMS and are covered in Annex A.
Optical test sample construction:
The optical test sample is built with 2 closures: one configured as track/spur joint and one configured as
distribution joint (access point for connections to customers). The selected cables shall be suitable for
the selected temperature range.
Step 1: Both extremities of a looped cable are terminated in the track/spur joint closure (see Figure 6).
The length of the looped cable is chosen to be longer than the “dead zone” of an optical time domain
reflectometer (OTDR). Typically, a cable loop length of 25 m to 50 m is used, allowing location of the
potential causes of optical losses and to distinguish whether a change in signal is induced by the fibre
management system in a single location or distributed evenly over the whole circuit length.
Key
1 circuits for connections to test equipment
2 fibres
3 track/spur joint closure
4 cable
5 tubes
6 looped cable
7 fibres, spliced in SE, ME or MR trays
Figure 6 — Track/spur joint configuration sample
In the track/spur joint closure, the fibres from one cable end are connected to the fibres of the other
cable end in such a way that light will sequentially flow through an optical circuit of 10 random selected
incoming fibres from the cab
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