SIST EN 50411-2-10:2015
(Main)Fibre organisers and closures to be used in optical fibre communication systems - Product specifications - Part 2-10: Sealed fibre splice closures type 2, category G, for FTTH optical distribution networks
Fibre organisers and closures to be used in optical fibre communication systems - Product specifications - Part 2-10: Sealed fibre splice closures type 2, category G, for FTTH optical distribution networks
This specification contains the dimensional, optical, mechanical and environmental performance requirements of a fully installed splice closure for use in optical distribution networks at ground level (category G) in order for it to be categorised as an EN standard product. This type of sealed closures is intended for easy and/or frequent opening and closing in FTTH distribution and drop cable networks.
NOTE The sealing performance requirements and test severities of these closures are selected to obtain an IP 67 intrusion protection performance as defined in EN 60529.
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen – Produktnormen -- Teil 2-10: LWL-Muffen Typ 2 die Kategorie G
Diese Spezifikation enthält die optischen, mechanischen und die Maßanforderungen sowie die Anforde-rungen an die Umweltverträglichkeit eines vollständig installierten Spleißverschlusses zur Verwendung in optischen Verteilnetzen am Boden (Kategorie G), damit dieser als ein EN-Standardprodukt eingestuft werden kann. Diese abgedichteten Muffentypen sind für einfaches und/oder häufiges Öffnen und Schließen in FTTH-Verteilungs- und Verbindungskabelnetzen vorgesehen.
ANMERKUNG Die Anforderungen an die Abdichtung und die Prüfschärfegrade dieser Muffen werden so gewählt, dass diese die in EN 60529 festgelegte Schutzklasse IP-67 gegen das Eindringen von Staub und Wasser einhalten.
Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par fibres optiques - Spécifications de produits -- Partie 2-10: Boîtiers à épissure de fibres scellés Type 2, catégorie G, pour réseaux de distribution optiques FttH
La présente spécification contient les exigences de performances dimensionnelles, optiques, mécaniques et environnementales d'un boîtier d'épissure entièrement installé pour une utilisation dans les réseaux de distribution optiques au niveau du sol (catégorie G) pour qu'il soit classé comme produit couvert par une norme EN. Ce type de boîtiers scellés est prévu pour une ouverture et une fermeture fréquentes et/ou faciles dans les réseaux de distribution FttH et les réseaux de câbles de raccordement.
NOTE Les exigences de performances de scellement et les sévérités d’essai de ces boîtiers sont choisies pour obtenir une performance de protection contre toute intrusion IP 67 comme défini dans l'EN 60529.
Delilniki za optična vlakna in kabelske spojnice za optične komunikacijske sisteme - Specifikacije izdelka - 2-10. del: Zatesnjena ohišja optičnih spojnic tipa 2, kategorija G, za optična razdelilna omrežja FTTH
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50411-2-10:2015
01-julij-2015
'HOLOQLNL]DRSWLþQDYODNQDLQNDEHOVNHVSRMQLFH]DRSWLþQHNRPXQLNDFLMVNHVLVWHPH
6SHFLILNDFLMHL]GHONDGHO =DWHVQMHQDRKLãMDRSWLþQLKVSRMQLFWLSD
NDWHJRULMD*]DRSWLþQDUD]GHOLOQDRPUHåMD)77+
Fibre organisers and closures to be used in optical fibre communication systems -
Product specifications - Part 2-10: Sealed fibre splice closures type 2, category G, for
FTTH optical distribution networks
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen
– Produktnormen -- Teil 2-10: LWL-Muffen Typ 2 die Kategorie G
Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par
fibres optiques - Spécifications de produits -- Partie 2-10: Boîtiers à épissure de fibres
scellés Type 2, catégorie G, pour réseaux de distribution optiques FttH
Ta slovenski standard je istoveten z: EN 50411-2-10:2015
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 50411-2-10:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50411-2-10:2015
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SIST EN 50411-2-10:2015
EUROPEAN STANDARD EN 50411-2-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2015
ICS 33.180.20
English Version
Fibre organisers and closures to be used in optical fibre
communication systems - Product specifications - Part 2-10:
Sealed fibre splice closures type 2, category G, for FTTH optical
distribution networks
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-
Spécifications de produits - Partie 2-10: Boîtiers à épissure 10: Abgedichtete LWL-Muffen Typ 2 für die Kategorie G für
de fibres scellés Type 2, catégorie G, pour réseaux de optische FTTH-Verteilnetze
distribution optiques FttH
This European Standard was approved by CENELEC on 2014-11-11. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50411-2-10:2015 E
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SIST EN 50411-2-10:2015
EN 50411-2-10:2015 – 2 –
Contents
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 Description . 7
3.1 Fibre splice closure . 7
3.2 Closure overpressure safety . 8
3.3 Cable and closure seals . 8
3.4 Fibre management system . 9
3.5 Materials . 9
3.6 Colour and marking . 9
4 Variants. 10
5 Dimensional requirements . 12
6 Tests . 13
6.1 Sample size . 13
6.2 Test sample preparation . 13
6.3 Test and measurement methods . 14
6.4 Test sequence . 14
6.5 Pass/fail criteria . 14
7 Test report . 14
8 Performance requirements . 15
8.1 Dimensional and marking requirements . 15
8.2 Sealing, optical and appearance performance criteria. 15
8.3 Mechanical sealing performance requirements . 16
8.4 Environmental sealing performance requirements . 18
8.5 Mechanical optical performance requirements . 19
8.6 Environmental optical performance requirements . 20
Annex A (informative) Fibre for test sample details . 21
Annex B (informative) Sample size and product sourcing requirements . 22
Figures
Figure 1 . 8
Figure 2 . 8
Figure 3 . 8
Figure 4 – Outline dimensions of closure Type 2 . 12
Figure 5 a) – Track joint configuration sample . 13
Figure 5 b) – Distribution joint configuration sample . 14
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SIST EN 50411-2-10:2015
– 3 – EN 50411-2-10:2015
Tables
Table 1 – Fibre splice closure for optical distribution networks, Type 2, Category G - Variants . 10
Table 2 - Closure size and minimum splice capacity . 11
Table 3 – Closure Type 2 dimensions . 12
Table 4 – Sealing, optical and appearance performance criteria . 15
Table 5 – Mechanical sealing performance requirements . 16
Table 6 – Environmental sealing performance requirements . 18
Table 7 – Mechanical optical performance requirements . 19
Table 7 – Mechanical optical performance requirements (continued) . 20
Table 8 – Environmental optical performance requirements . 20
Table A.1 – Fibre references . 21
Table A.2 – Fibre references . 21
Table B.1 – Minimum sample size requirements . 22
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SIST EN 50411-2-10:2015
EN 50411-2-10:2015 – 4 –
Foreword
This document (EN 50411-2-10:2015) 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
(dop) 2015-11-11
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2017-11-11
standards conflicting with this
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
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Fibre organisers and closures to be used in optical fibre communication systems – Product specifications
Part 2-10: Sealed fibre splice closures type 2, category G, for FTTH optical distribution networks
Description Performance
Construction: Sealed closures IP67 Applications:
Fibre management: Single Circuit, Single Element, Multiple
Optical fibre cable EN 61753-1, category G
Element and/or Single/Multiple Ribbon networks for ground
level
Related documents:
EN 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: Sectional specification – Outdoor cables (IEC 60794-3)
EN 61753-1 Fibre optic interconnecting devices and passive components – Part 1: General and guidance for
performance standard (IEC 61753-1)
EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and measurement
procedures (IEC 61300 series)
Construction and splice capacity: Closure size and minimum total splice capacity
Fibre management system separation level
Closure Single Single Single Multiple Multiple
size Circuit Element Ribbon Element Ribbon
L
(SC) (SE) (SR) (ME) (MR)
H
R 4 12 - - -
W
Dome type
A 8 12 - 24 -
B 16 24 12 48 24
C 32 48 24 96 48
D 48 72 48 144 96
E 96 144 96 288 192
F 144 216 144 432 288
Pan type
G
192 288 192 576 384
H
288 432 288 864 576
L
H
W
In-line type
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SIST EN 50411-2-10:2015
EN 50411-2-10:2015 – 6 –
1 Scope
1.1 Product definition
This specification contains the dimensional, optical, mechanical and environmental performance
requirements of a fully installed splice closure for use in optical distribution networks at ground level
(category G) in order for it to be categorised as an EN standard product. This type of sealed closure is
intended for easy and/or frequent opening and closing in FTTH distribution and drop cable networks.
NOTE The sealing performance requirements and test severities of these closures are selected to obtain an IP 67 intrusion protection
performance as defined in EN 60529.
1.2 Operating environment
The tests selected combined with the severity and duration are representative of an outside plant for ground
level environment defined by EN 61753-1, category G: ground level. This corresponds with:
- operating temperature range: -40 °C to +65 °C;
- direct exposure to non weather protected outside plant conditions;
- deployment at ground level up to 3 metres above ground level;
- additionally to the category G environment, a deployment till 1 metre below ground level is added.
Direct buried applications are allowed, however additional protection will be required when the
locations are intended for passage of cars or other heavy vehicles.
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 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 Allowed fibre and cable types
Although the performance tests are carried out on test samples containing dispersion unshifted single mode
fibre (see Annex A), the closure, once tested according to this product specification, will be also suited for
other fibre types like dispersion shifted, non-zero dispersion shifted and multimode fibres.
This closure standard allows both single mode and multimode fibre to be used and covers 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), EN 60794-3 (outdoor).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 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 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 (IEC 61300-2-5)
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EN 61300-2-10 Part 2-10: Test – Crush resistance (IEC 61300-2-10)
EN 61300-2-12 Part 2-12: Tests – Impact (IEC 61300-2-12)
EN 61300-2-22 Part 2-22: Tests – Change of temperature (IEC 61300-2-22)
EN 61300-2-23 Part 2-23: Tests – Sealing for non-pressurised closures of fibre optic devices
(IEC 61300-2-23)
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 mechanical splices, fibre
management systems and closures (IEC 61300-2-33)
EN 61300-2-34 Part 2-34: Tests – Resistance to solvents and contaminating fluids of interconnecting
components and closures (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 Part 2-38: Tests – Sealing for pressurized fibre optic closures (IEC 61300-2-38)
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 61300-3-28 Part 3-28: Examinations and measurements – Transient loss (IEC 61300-3-28)
EN 61753-1 Fibre optic interconnecting devices and passive components performance standard –
Part 1: General and guidance for performance standards (IEC 61753-1)
3 Description
3.1 Fibre splice closure
A fibre splice closure comprises a housing providing a mean to attach the ends of the incoming and
outcoming cables and a means for containing and protecting the fibres, splices and other passive optical
devices.
This is not to be confused with an optical closure for blowing cable or fibre. This comprises an access
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, EN 50411-2-10 shall be used when air blown fibres are spliced
inside this type of closure.
The closure provides facilities for environmental protection, housing for a fibre management system and
sealing of input and output optical fibre cables. In order to comply with the standard, the optical functionality,
geometrical, environmental and mechanical requirements are defined.
The design of the closure housing shall allow the jointing of two or more cable ends in the following
configurations or applications:
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SIST EN 50411-2-10:2015
EN 50411-2-10:2015 – 8 –
(T) Track joint configuration used to interconnect at least two cables (example: drop cable repair closure)
Cable Cable
Closure
Figure 1
(S) Spur joint configuration used to split one cable into at least 2 smaller cables.
Figure 2
(D) Distribution joint configuration used on customer feed cable with minimum of 8 cable entries (D1),
10 cable entries (D2), 18 cable entries (D3) or 34 cable entries (D4) (see Clause 4).
Uncut fibres Cable
Cable
Closure
Drop cable(s)
Figure 3
NOTE Cable entries can be more than one cable per cable entry port.
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 distribution closure can be re-opened when necessary without interruption or
disturbance of the traffic of the live circuits.
3.2 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.
3.3 Cable and closure seals
The closure allows for a physical housing structure that provides optical cable fixing, sealing, anchoring,
water and gas blocking, storage and routing up to the input and output fibres of the fibre management
system.
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3.4 Fibre management system
The fibre management system in the closure provides means for routing, storing and mechanical protection
of fibre splices or other passive optical devices in a predetermined order, from one cable sheath opening to
another.
Fibre circuits may be separated to an appropriate separation level. This will limit the risk of interruption of
traffic to those fibres that belong to the same group of circuits when changes are made to other circuits.
• Single Circuit (SC) is a fibre management separation level containing a group of fibres providing one
termination or service on 1, 2 or 4 fibres to one subscriber. In this document a Single Circuit is
considered to be a circuit of 4 fibres.
• Single Element (SE) is a fibre management separation level containing one or more optical fibres from
a cable element inside a common covering e.g. loose tube or inside one groove of a grooved cable
(slotted core cable). Single Elements provide terminations or services to more than one subscriber and
contain typically 12 fibres. In this document a Single Element is considered to be a group of 12 fibres.
• Single Ribbon (SR) is a fibre management separation level comprising one optical ribbon. Single
Ribbon is a group of fibres providing one termination or service to one subscriber with of typically 4, 8 or
12 fibres per ribbon. In this document ribbon is considered to have 12 fibres.
• Multiple Element (ME) is a fibre management separation level that provides all necessary equipment to
connect a defined number of incoming and outgoing fibres/cables. It comprises storage and protection of
fibres and interconnections in one splice tray for more than one Single Element circuit. Typically ME
splice tray capacities are 24, 72 and 144 fibres. In this document a Multiple Element is considered to
have 24 fibres.
• Multiple Ribbon (MR) fibre management separation level provides all necessary equipment to connect
a defined number of incoming and outgoing fibre ribbons that are generally housed within a singe tube or
slot within the cable. It comprises storage and protection of more than one Single Ribbon circuit, with
typically six or more fibre ribbons and their interconnections in a single splice tray for ribbons between 4
and 36 fibres per ribbon (typically 12 fibres per ribbon). There are also many different names for this
structure, e.g. mass splicing storage or mass ribbons. The splice tray capacities are between 24 and
144 fibres. In this document a Multiple Ribbon is considered to have 2 ribbons of 12 fibres (=24 fibres in
total)
3.5 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 materials of the cables.
All components of the closure shall be resistant to solvents and degreasing agents that are typically used to
clean and degrease fibres and cables.
The effects of UV light and fungi on all exposed polymeric materials shall not affect product performance.
The effects of fungus and UV light shall be determined by measuring the decrease of a suitable property
(e.g. tensile strength) both before and after exposure.
Metallic parts shall be resistant to the corrosive influences they may encounter during the lifetime of the
product.
3.6 Colour and marking
Marking/identification of the ‘variant number’ (see Clause 4) to be on the product or packaging label along
with the following:
a) identification of supplier or manufacturer;
b) manufacturing date code: year / month.
There is no preferred colour for the outer closure materials.
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SIST EN 50411-2-10:2015
EN 50411-2-10:2015 – 10 –
4 Variants
Table 1 – Fibre splice closure for optical distribution networks, Type 2, Category G - Variants
EN 50411-2-10 – G –X –XX – XX –XX – X – X
1 2 3 4 5 6
Variant No. Shape of closure
X
1
D Dome shape closure
P Pan shape closure
I In-line closure
Variant No.
Closure application – base number of cables
XX
2
T1 Track closure (2 cables minimum)
S1 Spur closure (3 cables minimum)
D1 Distribution (8 cables minimum)
D2 Distribution (10 cables minimum)
D3 Distribution (18 cables minimum)
D4 Distribution (34 cables minimum)
Variant No. Nominal fibre storage radius
XX
3
20 20 mm radius (for EN 60793-2-50, B6 fibres)
30 30 mm radius (for EN 60793-2-50, B1 fibres and B6
fibres)
Variant No.
Fibre management system separation level
XX
4
SC Single Circuit (up to 4 fibres)
SE Single Element (up to 12 fibres)
SR Single Ribbon (4 or more fibres per ribbon)
ME Multiple Element (two or more units)
MR Multiple Ribbon (six or more ribbons 4 fibres per ribbons)
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Depending on the selection of XX , and the minimum required splice capacity, refer to Table 1 to find X
4 5
(closure size)
Table 2 - Closure size and minimum splice capacity
Minimum number of spliced fibres
(without storage basket)
X
5
Separation level
Closure
size
Multiple Single Multiple
Single Circuit Single Element
Element Ribbon Ribbon
4 splices/tray 12 splices/tray
12 splices/tray
R 4 12 NA NA NA
A 8 12 24 NA NA
B 16 24 48 12 24
C 36 48 96 24 48
D 48 72 144 48 96
E 96 144 288 96 192
F 144 216 432 144 288
G 192 288 576 192 384
H 288 432 864 288 576
Variant No. Loose tube storage basket
X
6
N No storage basket
Y Storage basket
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SIST EN 50411-2-10:2015
EN 50411-2-10:2015 – 12 –
5 Dimensional requirements
L
H
W
a) Dome type b) Pan type
L
H
W
c) In-line type
Figure 4 – Outline dimensions of closure Type 2
Table 3 – Closure Type 2 dimensions
Minimum total splice capacity Outline closure envelope
NA: Not applicable dimensions (max.)
Separation level
Overal
Closure
Overall Overall
l
size
Single Single Multiple Single Multiple
width height
length
Circuit Element Element Ribbon Ribbon
mm mm
mm
4 12 24 12 24 W H
a
L
splices/tray splices/tray splices/tray splices/tray splices/tray
R 4 12 NA NA NA 350 100 80
A 8 12 24 NA NA 400 200 100
B 16 24 48 12 24 450 200 150
C 36 48 96 24 48 500 200 200
D 48 72 144 48 96 600 350 250
E 96 144 288 96 192 750 400 350
F 144 216 432 144 288 800 450 400
G 192 288 576 192 384 850 500 450
H 288 432 864 288 576 900 500 450
a
For In-line closures, add 100 mm to the corresponding value of L.
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6 Tests
6.1 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 6.2. Due to their complexity, consecutive testing on
the same optical sample is allowed.
The minimum recommended sample sizes are given in Annex B.
6.2 Test sample preparation
Sealing performance test samples shall be provided with an air pressure test access valve. The length of the
cables extending from the closure shall be at least 1 m. The open ends of the cables shall be sealed. Each
applicable cable type at 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
joint and/or distribution joint. This shall be realised by building optical circuits for each fibre separation level
(typical SC, SE, SR, ME or MR splicing and uncut fibre storage). The fibres for the optical test samples with
30 mm fibre storage radius (variant XX = 30) are EN 60793-2-50, B1.3 (information given in Table A.1). The
3
fibres for the optical test samples with 20 mm fibre storage radius (variant XX = 20) are EN 60793-2-50
3
B6_a1 (information in Table A.2).
Optical test sample construction:
Both extremities of a looped cable are terminated in the track joint closure (see Figure 5 a)). The length of
the looped cable is chosen in such a way that it is longer than the “dead zone” of an OTDR. This will allow
the location of potential causes of optical losses and allow a distinction between a change in signal being
induced by the organiser system in a single location or being distributed over the whole circuit length. The
required length depends on the selected pulse widt
...
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