SIST EN 50411-2-8:2009

Fibre organisers and closures to be used in optical fibre communication systems - Product specifications - Part 2-8: Microduct connectors, for air blown optical fibres, Type 1

This specification contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements of a fully installed blown fibre ‘microduct’ connector in order for it to be categorised as an EN standard product. This product specification covers the following ‘microduct connectors’ to suit a wide range of blown fibre applications, for floating or fixed:
- joining the same size microduct, or different sizes of microduct;
- joining same size protected microduct, to same or different size of microduct or protected microduct;
- disconnection of the connector to gain access, for example, to insert blowing equipment;
- a means to seal the fibre inside the connector to prevent the flow of liquids;
- close off open-ended microducts. This product specification covers blown fibre microduct connectors for use in ‘sub-ducts or protected micro-duct cable closures’ as specified in EN 50411-2-5 for use in outside environments, and for both sealed and nonsealed closures. The outside environment includes both subterranean (underground) and/or aerial applications. This document includes reducer/enlarger products. It may not be possible to blow through these devices. Manual feeding may be required because of the pressure gradient step. This product specification does not apply to microduct connectors for use in direct sunlight.

LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen - Produktnormen - Teil 2-8: ABF-Mikrorohrverbinder, Bauart 1

1.1   Produktdefinition Diese Norm enthält die Anfangs- und Maßanforderungen zu Beginn der Lebensdauer sowie die optischen, mechanischen und umweltbezogenen Leistungsanforderungen an einen vollständig installierten Mikrorohr-verbinder für eingeblasene LWL-Technik, damit er als EN-Standardprodukt eingestuft werden kann. Diese Produktnorm behandelt die folgenden Mikrorohrverbinder, die sich für einen großen Bereich von Anwendungen mit eingeblasener LWL-Technik eignen, und zwar für die gleitende oder befestigte: –   Verbindung von Mikrorohren mit gleichem Durchmesser oder von Mikrorohren mit unterschiedlichen Durchmessern; –   Verbindung eines geschützten Mikrorohres mit einem Mikrorohr oder geschützten Mikrorohr mit der gleichen oder anderen Größe; –   Abkopplung des Verbinders, um beispielsweise Zugang zum Einführen der Einblaseinrichtung zu bekommen; –   Abdichtung der Faser im Inneren des Verbinders, um das Fließen von Flüssigkeiten zu verhindern; –   Absperrung von Mikrorohren mit offenem Ende. Diese Produktnorm behandelt Mikrorohrverbinder für eingeblasene LWL-Technik für die Anwendung in Zwischenrohren oder geschützten Mikrorohren nach EN 50411 2 5 für Umgebungen im Freien sowie für abgedichtete und nicht abgedichtete LWL-Muffen. Die Umgebung im Freien schließt unterirdische und/oder Luftumgebungen ein. Dieses Schriftstück schließt Reduzier-/Erweiterungsprodukte ein. Das Einblasen durch diese Einrichtungen darf nicht möglich sein. Aufgrund der Druckgefälles darf ein manuelles Zuführen gefordert werden. Diese Produktnorm gilt nicht für Mikrorohrverbinder zur Anwendung in direktem Sonnenlicht. 1.2   Betriebsumgebung Die ausgewählten Prüfungen in Kombination mit den Prüfschärfen und der Dauer sind repräsentativ für eine Außenanlage mit unterirdischer und/oder Luftumgebungen, die definiert sind in: –   ETSI EN 300 019 (Reihe):   Klasse 8.1: Einsatz im Untergrund; –   EN 61753 1:            alle Kategorien. 1.3   Zuverlässigkeit Die erwartete Betriebslebensdauer des Produkts in dieser Umgebung beträgt mindestens 20 Jahre, wobei die Einhaltung dieser Norm die Zuverlässigkeit des Produkts nicht garantiert. Dieser Wert sollte anhand eines anerkannten Zuverlässigkeitsbewertungsprogramms vorhergesagt werden. 1.4   Qualitätssicherung Die Einhaltung dieser Norm garantiert nicht die Gleichmäßigkeit bei der Fertigung des Produktes. Sie sollte mit einem anerkannten Qualitätssicherungsprogramm aufrechterhalten werden. 1.5   Sicherheitskennzeichnung – Warnung: Notwendigkeit einer Überdruckvorrichtung in abgedichteten LWL-Muffen Alle Faserverbinder für eingeblasene LWL-Technik, die nach dieser Norm geliefert werden, müssen auf dem Produkt oder auf der Verpackung den folgenden sinngemäßen Warnhinweis tragen:  Wo Verbinder für eingeblasene LWL-Technik im Inneren einer hermetisch dichten Muffe oder hermetisch dichten Gehäuses installiert werden, muss die Muffe mit einem Überdruck-Sicherheitssystem ausgerüstet werden können, die Luft auf Luftdruck ablässt.

Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par fibres optiques - Spécifications de produits - Partie 2-8: Connecteurs en microconduits de Type 1, destinés aux fibres optiques soufflées à l'air comprimé

Delilniki za optična vlakna in kabelske spojnice za uporabo v optičnih komunikacijskih sistemih - Specifikacija izdelka - 2-8. del: Konektorji mikrokanalov z zračnim vpihovanjem optičnih vlaken, tip 1

General Information

• Status: Published
• Publication Date: 09-Jun-2009
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-May-2009
• Due Date: 01-Aug-2009
• Completion Date: 10-Jun-2009
• Ref Project: EN 50411-2-8:2009 - Fibre organisers and closures to be used in optical fibre communication systems - Product specifications - Part 2-8: Microduct connectors, for air blown optical fibres, Type 1

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50411-2-8:2009
01-julij-2009
'HOLOQLNL]DRSWLþQDYODNQDLQNDEHOVNHVSRMQLFH]DXSRUDERYRSWLþQLK
NRPXQLNDFLMVNLKVLVWHPLK6SHFLILNDFLMDL]GHONDGHO.RQHNWRUMLPLNURNDQDORY
]]UDþQLPYSLKRYDQMHPRSWLþQLKYODNHQWLS
Fibre organisers and closures to be used in optical fibre communication systems -
Product specifications - Part 2-8: Microduct connectors, for air blown optical fibres, Type
1
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen
- Produktnormen - Teil 2-8: ABF-Mikrorohrverbinder, Bauart 1
Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par
fibres optiques - Spécifications de produits - Partie 2-8: Connecteurs en microconduits
de Type 1, destinés aux fibres optiques soufflées à l'air comprimé
Ta slovenski standard je istoveten z: EN 50411-2-8:2009
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 50411-2-8:2009 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50411-2-8:2009

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SIST EN 50411-2-8:2009

EUROPEAN STANDARD
EN 50411-2-8

NORME EUROPÉENNE
May 2009
EUROPÄISCHE NORM

ICS 33.180.20


English version


Fibre organisers and closures to be used
in optical fibre communication systems -
Product specifications -
Part 2-8: Microduct connectors, for air blown optical fibres, Type 1



Organiseurs et boîtiers de fibres à utiliser LWL-Spleißkassetten und -Muffen
dans les systèmes de communication für die Anwendung in LWL-
par fibres optiques - Kommunikationssystemen -
Spécifications de produits - Produktnormen -
Partie 2-8: Connecteurs en microconduits Teil 2-8: ABF-Mikrorohrverbinder,
de Type 1, destinés aux fibres optiques Bauart 1
soufflées à l'air comprimé





This European Standard was approved by CENELEC on 2008-12-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels


© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50411-2-8:2009 E

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SIST EN 50411-2-8:2009
EN 50411-2-8:2009 – 2 –
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 86BXA, Fibre optic
interconnect, passive and connectorised components.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50411-2-8 on
2008-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-12-01
__________

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SIST EN 50411-2-8:2009
– 3 – EN 50411-2-8:2009
Fibre organisers and closures to be used in optical fibre communication systems -
Product specifications
Microduct connectors, for air blown optical fibres, Type 1
Description Performance
Construction: Sealed microduct connector Applications: Optical fibre cable networks
EN 61753-1
Tube seals: Cold applied

Connector types: Straight, Straight bulkhead,
Reducer, Close down, Liquid block,
Liquid block with barb end,
End stop and Stem.
Related documents:
EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and measurement
procedures (IEC 61300 series)
EN 61753-1 Fibre optic interconnecting devices and passive components performance standard –
Part 1: General and guidance for performance standards (IEC 61753-1)
ETSI EN 300 019 series Environmental Engineering (EE) – Environmental conditions and environmental tests for
telecommunications equipment
Construction: Examples
‘Straight through’


Connector dimensions for non-bulkhead mounting

Microduct diameter
Nominal Diameter or Length
microduct across corners
outside
D L
diameter
Microduct connector
max. max.
mm mm
3 mm 9 23
4 mm 14 32
L
5 mm 15 40
6 mm 15 38
7 mm 18 42
8 mm 20 46
10 mm 24 50
12 mm 25 54
14 mm 29 62
D
15 mm
33 70
16 mm

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SIST EN 50411-2-8:2009
EN 50411-2-8:2009 – 4 –
Contents
1 Scope . 7
1.1 Product identification . 7
1.2 Operating environment . 7
1.3 Reliability . 7
1.4 Quality assurance . 7
1.5 Safety labelling – Warning: need for an ‘over pressure device' in sealed closures. 7
2 Normative references . 8
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 11
4 Description . 11
4.1 Microduct connector housing . 11
4.2 Burst pressure . 15
4.3 Microduct seals . 15
4.4 Materials . 15
4.5 Marking . 15
5 Variants . 16
6 Dimensional requirements . 17
6.1 Dimensions diagram . 17
6.2 ‘Straight' connectors – Equal microduct . 17
6.3 ‘Straight bulkhead’ connectors – Equal microduct . 18
6.4 ‘ID reducer/enlarger stem’ connectors . 18
6.5 ‘ID reducer/enlarger’ connectors . 19
6.6 ‘OD reducer/enlarger stem’ connectors . 19
6.7 ‘OD reducer/enlarger’ connectors . 20
6.8 ‘ID and OD reducer/enlarger stem’ connectors . 20
6.9 ‘ID and OD reducer/enlarger’ connectors . 21
6.10 ‘Close Down’ connectors . 21
6.11 ‘Liquid Block’ connector . 22
6.12 ‘Liquid Block with barb end’ connectors . 22
6.13 ‘End Stop’ connectors . 22
7 Tests . 23
7.1 Sample size . 23
7.2 Test sample preparation . 23
7.3 Test and measurement methods . 24
7.4 Test sequence . 24
7.5 Pass/fail criteria . 24
8 Test report . 24
9 Performance requirements . 24
9.1 Bend radius . 24
9.2 Dimensional and marking requirements. 24
9.3 Sealing, optical and appearance performance criteria . 24
9.4 Mechanical sealing performance requirements . 26
9.5 Environmental sealing performance requirements. 28

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SIST EN 50411-2-8:2009
– 5 – EN 50411-2-8:2009
Annex A (informative) Sample size and product sourcing requirements . 30
Annex B (informative) Air blown fibre microduct – Mean outside diameter range . 31
Annex C (normative) Test method – High pressure resistance – Safety . 32
Annex D (normative) Test method – Installation . 33
Annex E (normative) Test method – Insertion force . 34
Bibliography . 35
Figures
Figure 1 – Fibre flow impedance . 11
Figure 2 – Fibre flow impedance – Both direction step . 11
Figure 3 – Fibre flow impedance – One direction step . 12
Figure 4 – Fibre flow impedance – Acute angled step . 12
Figure 5 – ‘Typical' connector elements – Cross sectional view. 13
Figure 6 – ‘Straight’ – Equal microduct outside diameters . 13
Figure 7 – ‘Straight bulkhead’ – Equal microduct outside diameters . 13
Figure 8 – ‘ID reducer/enlarger stem’– Unequal microducts with a different ID ‘OD reducer/enlarger
stem’ – Unequal microducts with a different OD ‘ID and OD reducer/enlarger stem’ – Unequal
microducts with a different ID and OD . 13
Figure 9 – ‘ID reducer/enlarger’ – Unequal microducts with a different ID ‘OD reducer/enlarger’ –
Unequal microducts with a different OD ‘ID and OD reducer/enlarger’ – Unequal microducts
with a different ID and OD . 14
Figure 10 – Close down assembly access for blowing head equipment . 14
Figure 11 – Liquid block transition point to stop liquid migration . 14
Figure 12 – Liquid block with a barb end transition point to stop liquid migration . 14
Figure 13 – End stop. 14
Figure 14 – Microduct interconnection geometry . 15
Figure 15 – Microduct connector overall dimensions . 17
Figure 16 – Sealing performance test sample (tank to source) . 23
Figure 17 – Optical test chamber – Liquid block connectors (only) . 24
Figure E.1 – Test apparatus for insertion force method . 34

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SIST EN 50411-2-8:2009
EN 50411-2-8:2009 – 6 –
Tables
Table 1 – Micro-duct connector – Variants EN 50411-2-8 – XXX/XXX - XXX/XXX – XXX – X . 16
1 2 3 4
Table 2 – ‘Straight’ connector design – Maximum dimensions . 17
Table 3 – ‘Straight bulkhead’ connector – Maximum dimensions . 18
Table 4 – ‘ID reducer/enlarger stem’ connector – Maximum dimensions . 18
Table 5 – ‘ID reducer/enlarger’ connector – Maximum dimensions . 19
Table 6 – ‘OD reducer/enlarger stem’ connector – Maximum dimensions . 19
Table 7 – ‘OD reducer/enlarger’ connector – Maximum dimensions . 20
Table 8 – ‘ID and OD reducer/enlarger stem’ connector – Maximum dimensions . 20
Table 9 – ‘ID and OD reducer/enlarger’ connector – Maximum dimensions . 21
Table 10 – ‘Close Down’ connector – Maximum dimensions . 21
Table 11 – ‘Liquid Block’ connectors – Maximum dimensions . 22
Table 12 – ‘Liquid Block with barb end’ connectors - Maximum dimensions . 22
Table 13 – ‘End Stop’ connector . 22
Table 14 – Tightness, optical and appearance performance criteria . 25
Table 15 – Mechanical requirements . 26
Table 16 – Environmental sealing performance requirements . 28
Table A.1 – Minimum sample size requirements . 30
Table B.1 – Air blown fibre microduct – Mean outside diameter range . 31

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SIST EN 50411-2-8:2009
– 7 – EN 50411-2-8:2009
1 Scope
1.1 Product identification
This specification contains the initial, start of life dimensional, optical, mechanical and environmental
performance requirements of a fully installed blown fibre ‘microduct’ connector in order for it to be categorised
as an EN standard product.
This product specification covers the following ‘microduct connectors’ to suit a wide range of blown fibre
applications, for floating or fixed:
• joining the same size microduct, or different sizes of microduct;
• joining same size protected microduct, to same or different size of microduct or protected microduct;
• disconnection of the connector to gain access, for example, to insert blowing equipment;
• a means to seal the fibre inside the connector to prevent the flow of liquids;
• close off open-ended microducts.
This product specification covers blown fibre microduct connectors for use in ‘sub-ducts or protected micro-duct
cable closures’ as specified in EN 50411-2-5 for use in outside environments, and for both sealed and non-
sealed closures. The outside environment includes both subterranean (underground) and/or aerial applications.
This document includes reducer/enlarger products. It may not be possible to blow through these devices.
Manual feeding may be required because of the pressure gradient step.
This product specification does not apply to microduct connectors for use in direct sunlight.
1.2 Operating environment
The tests selected, combined with the severity and duration, are representative of an outside plant
environment for both subterranean and aerial environments defined by
• ETSI EN 300 019 series: class 8.1: underground locations,
• EN 61753-1: all categories.
1.3 Reliability
Whilst the anticipated service life expectancy of the product in these environments is 20 years, compliance
with this specification does not guarantee the reliability of the product. This should be predicted using a
recognised reliability assessment programme.
1.4 Quality assurance
Compliance with this specification does not guarantee the manufacturing consistency of the product. This
should be maintained using a recognised quality assurance programme.
1.5 Safety labelling – Warning: need for an ‘over pressure device' in sealed closures
All air blown fibre connectors, supplied to this standard, must have a warning on the product or packaging to
read as follows:
Where the air blown fibre connector is installed inside a sealed airtight closure or housing, the closure must
be able to be fitted with an over pressure safety system that is able to exhaust air to atmospheric pressure.

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SIST EN 50411-2-8:2009
EN 50411-2-8:2009 – 8 –
2 Normative references
The following referenced documents are indispensable for the application 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 50411-2-5 Fibre organisers and closures to be used in optical fibre communication systems –
Product specifications – Part 2-5: Sealed closures for air blown fibre microduct,
type 1, for category S & A
EN 60793-1-40:2003 Optical fibres – Part 1-40: Measurement methods and test procedures – Attenuation
(IEC 60793-1-40:2001, mod.)
EN 60794-1-2:2003 Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test
procedures (IEC 60794-1-2:2003)
EN 60794-5 series Optical fibre cables – Part 5: Sectional specification – Microduct cabling for
installation by blowing (IEC 60794-5 series)
EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures (IEC 61300 series)
EN 61300-2-1 Part 2-1: Tests – Vibration (sinusoidal) (IEC 61300-2-1)
EN 61300-2-4 Part 2-4: Tests – Fibre/cable retention (IEC 61300-2-4)
EN 61300-2-5 Part 2-5: Tests – Torsion/twist (IEC 61300-2-5)
EN 61300-2-10 Part 2-10: Tests – Crush resistance (IEC 61300-2-10)
EN 61300-2-22 Part 2-22: Tests – Change of temperature (IEC 61300-2-22)
EN 61300-2-23:1997 Part 2-23: Tests – Sealing for non-pressurized closures of fibre optic devices
(IEC 61300-2-23:1995)
EN 61300-2-26 Part 2-26: Tests – Salt mist (IEC 61300-2-26)
EN 61300-2-33 Part 2-33: Tests – Assembly and disassembly of fibre optic closures
(IEC 61300-2-33)
EN 61300-2-34 Part 2-34: Tests – Resistance to solvents and contaminating fluids (IEC 61300-2-34)
EN 61300-2-37 Part 2-37: Tests – Cable bending for fibre optic closures (IEC 61300-2-37)
EN 61300-2-38:2006 Part 2-38: Tests – Sealing for pressurized fibre optic closures (IEC 61300-2-38:2006)
EN 61300-3-1 Part 3-1: Examinations and measurements – Visual examination (IEC 61300-3-1)
EN 61300-3-3 Part 3-3: Examinations and measurements – Active monitoring of changes in
attenuation and return loss (IEC 61300-3-3)
EN 61753-1 Fibre optic interconnecting devices and passive components performance standard –
Part 1: General and guidance for performance standards (IEC 61753-1)
ETSI EN 300 019 series Equipment Engineering (EE) – Environmental conditions and environmental tests for
telecommunications equipment
ISO 1998-1 Petroleum industry – Terminology – Part 1: Raw materials and products
EN 590 Automotive fuels – Diesel – Requirements and test methods

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SIST EN 50411-2-8:2009
– 9 – EN 50411-2-8:2009
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
ABF microduct closure
physical housing containing microduct management, such as connection, fixing, sealing, anchoring, liquid
and/or gas blocking, storage and routing between the input and output protected microduct of the air blown
fibre cable system
3.1.2
microducts (MD)
small, flexible, lightweight tube with an outer diameter typically less than or equal to 16 mm
3.1.3
protected microducts
one or more microducts surrounded by a protective sheath or pre-installed in a protective duct
3.1.4
microduct optical fibre cables
optical fibre cables suitable for installation by blowing into a microduct
3.1.5
microduct optical fibre unit
fibre unit that is suitable for installation by blowing into a microduct. They differ from microduct optical fibre
cables in that they provide less protection to the fibres that they contain
3.1.6
straight microduct connectors
microduct connectors that are used to connect two microducts together. This connector has a means of
microduct attachment and sealing on both sides and is typically unsupported (floating inside the closure)
3.1.7
straight bulkhead microduct connectors
microduct connectors, are used to connect two microducts together. This connector has a means of
microduct attachment and sealing on both sides and is typically supported on a bulkhead by a suitable fixing
system (i.e. nut or clip)
3.1.8
different ID reducers/enlarger stem microduct connectors
stem connectors which connect two microducts with the same OD but different ID, including a smooth
internal transition to prevent fibre ‘hang ups’. Typically they have microduct attachment and sealing at one
end of the connector, and a stem on the other end to facilitate attachment to a straight connector
3.1.9
different ID reducers/enlarger microduct connectors
connectors which connect two microducts with the same OD, but different ID, including a smooth internal
transition to prevent fibre hang ups. Typically they connect a heavy walled to a thinner wall MD
3.1.10
different OD reducers/enlarger stem microduct connectors
stem which connects two microducts with the same ID but different OD. Typically they have microduct
attachment and sealing at one end of the connector, and a stem on the other end to facilitate attachment to a
straight connector

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SIST EN 50411-2-8:2009
EN 50411-2-8:2009 – 10 –
3.1.11
different OD reducers/enlarger microduct connectors
connectors which connect two microducts with the same ID but different OD
3.1.12
different ID and OD reducers/enlarger stem microduct connectors
stem which connects two microducts with a different OD and different ID, including a smooth internal
transition to prevent fibre hang ups. Typically they have microduct attachment and sealing at one end of the
connector, and a stem on the other end to facilitate attachment to a straight connector
3.1.13
different ID and OD reducers /enlarger microduct connectors
connectors which connect two microducts with different OD and different ID, including a smooth internal
transition to prevent fibre hang ups
3.1.14
close down microduct connectors
microduct connectors that are used for access for blowing head equipment for cascade blowing which allow a
microduct to be opened and resealed after blowing, without detriment to the fibre in situ
3.1.15
liquid block microduct connectors
microduct connectors that are used at a transition point to stop liquids from flowing between the connected
microducts to avoid liquid and contaminant ingress and liquid damage to other equipment
3.1.16
liquid block with a barb end connectors
connectors similar to a liquid block connector. The barb end is designed to interface with the non-microduct
(transport tubing), which protects the fibre at a “fibre management system” closure
3.1.17
end stop microduct connectors
microduct connectors that are used for sealing open ended micro-duct to avoid air leakage, water or foreign
material ingress and for safety reasons
3.1.18
connector insertion force
force required to insert the microduct into the connector without damage
3.1.19
fibre management system (FMS)
system to control fibre routing from the incoming to the outgoing fibres, containing one or more splice
cassettes and additional functional elements
3.1.20
microduct management system (MMS)
system to control microduct routing inside a closure or housing, from the incoming to the outgoing microduct
jointed together with microduct connectors of various functional types
3.1.21
burst pressures
point at which the closure fails to contain pressure
3.1.22
cut backs
process to remove a short length of microduct in order to prepare the ends prior to fitting a new connector,
ensuring better sealing and attachment faces

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SIST EN 50411-2-8:2009
– 11 – EN 50411-2-8:2009
3.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
ABF Air Blown Fibre
AC Across Corners
ID Inside Diameter (microducts)
MD MicroDuct
MMS Microduct Management System
OD Outside Diameter (microducts)
PS Product Specification
4 Description
4.1 Microduct connector housing
It is essential that the connector should be compatible with input and output microduct internal diameters and
that the connector with different microduct internal diameter tubes, should not impede blowing performance
from the blowing direction.
Fibre flow impedance area (ringed)
Fibre flow directions
Figure 1 – Fibre flow impedance
Fibre flow impedance is typically caused by one of the following. Possible causes of impedance
...