oSIST prEN 50411-3-1:2021
(Main)Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications - Part 3-1: Fibre management system, splice wall box, for category C & G
Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications - Part 3-1: Fibre management system, splice wall box, for category C & G
1.1 Product definition
This document contains the dimensional, optical, mechanical and environmental performance requirements of a fully installed optical fibre wall or pole mounted box for up to 288 fibre splices, in order for it to be categorized as a European standard product.
The typical configuration is splicing of incoming fibres to optional splitters, connecting on the other side to outgoing fibres.
A box is a protective housing containing a fibre management system with splice trays of various fibre separation levels. The box can contain one or more of the following:
— storage and routing for fibre and cable;
— uncut fibre cable storage;
— splice trays;
— passive optical devices (optical splitters or WDM).
A box can be installed on a vertical indoor or outdoor surface above ground level. If the box is required to be relocatable with cables attached, the following additional tests are expected to be performed:
— cable bending;
— cable torsion.
This document specifies the number of splice trays and splice capacity for each fibre separation level. The maximum capacity is 288 splices. For housings with a higher number of splices, EN 50411 4 1 (street cabinets) can be used.
Boxes for fibre splice and patchcord connections are covered in EN 50411 3 4.
1.2 Operating environment
The tests selected, combined with the severity and duration, are representative of indoor and outside plant for above ground environments defined by EN IEC 61753 1:
— category C: Controlled (indoor) environment;
— category A: Aerial (outdoor above ground) environment.
1.3 Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this document does not guarantee the reliability of the product. This is expected to be predicted using a recognized reliability assessment programme.
1.4 Quality assurance
Compliance with this document does not guarantee the manufacturing consistency of the product. This is expected to be maintained using a recognized quality assurance programme.
1.5 Allowed fibre and cable types
This box standard accommodates EN 60793 2 50 single-mode fibres and EN 60793 2 10 A1-OM2 to A1-OM5 and A1-OM1 multimode fibres and all EN 60794 series optical fibre cables with various fibre capacities, types and designs.
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen - Produktnormen - Teil 3-1: Faser Management System, Wandspleißverteiler für die Kategorien C und G
Systèmes de gestion des fibres et boîtiers de protection destinés à être utilisés dans les systèmes de communication par fibres optiques - Spécifications de produits - Partie 3-1: Boîte de montage mural ou sur poteau pour les épissures, pour les catégories C et A
1.1 Définition du produit
Le présent document contient les exigences de performance dimensionnelles, optiques, mécaniques et environnementales d’une boîte de fibres optiques murale ou montée sur poteau, entièrement installée, capable d’accueillir jusqu’à 288 épissures de fibres, ces exigences lui permettant d’être catégorisée comme produit à la norme européenne.
La configuration type comprend l’épissurage de fibres entrantes sur des répartiteurs facultatifs, raccordées de l’autre côté sur des fibres sortantes.
Une boîte est un coffret de protection contenant un système de gestion de fibres équipé de plateaux d’épissures offrant différents niveaux de séparation de fibres. La boîte peut offrir une ou plusieurs des fonctions suivantes:
— stockage et acheminement pour les fibres et les câbles;
— stockage de câble de fibres non découpées;
— plateaux d’épissures;
— dispositifs optiques passifs (répartiteurs optiques ou WDM).
Une boîte peut être installée sur une surface intérieure ou extérieure verticale, au-dessus du niveau du sol. S’il est exigé que la boîte puisse être déplacée avec ses câbles déjà fixés, les essais supplémentaires suivants sont censés être effectués:
— courbure de câble;
— torsion de câble.
Le présent document spécifie le nombre de plateaux d’épissures et la capacité en épissures pour chaque niveau de séparation de fibres. La capacité maximale est de 288 épissures. Pour les coffrets contenant davantage d’épissures, l’EN 50411 4 1 (baies urbaines) peut être utilisée.
Les boîtes destinées aux raccordements d’épissures de fibres et de cordons de brassage sont traitées dans l’EN 50411 3 4.
1.2 Environnement de fonctionnement
Les essais sélectionnés, combinés aux sévérités et aux durées, sont représentatifs d’une installation intérieure et extérieure au-dessus du niveau du sol définie par l’EN IEC 61753 1:
— catégorie C: Environnement contrôlé (intérieur);
— catégorie A: Environnement aérien (extérieur au-dessus du niveau du sol).
1.3 Fiabilité
Tandis que l’espérance de vie du produit en service prévue dans cet environnement est de 20 ans, la conformité au présent document ne garantit pas la fiabilité du produit. Il est attendu que celle-ci soit estimée en utilisant un programme reconnu d’évaluation de la fiabilité.
1.4 Assurance de la qualité
La conformité au présent document ne garantit pas la cohérence de fabrication du produit. Il est attendu qu’elle soit suivie au moyen d’un programme reconnu d’assurance de la qualité.
Sistemi za upravljanje z optičnimi vlakni in zaščitna ohišja za optične komunikacijske sisteme - Specifikacije izdelka - 3-1. del: Sistem za upravljanje optičnih elementov, stenska omarica s spojnicami, za kategoriji C in G
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 50411-3-1:2021
01-april-2021
Sistemi za upravljanje z optičnimi vlakni in zaščitna ohišja za optične
komunikacijske sisteme - Specifikacije izdelka - 3-1. del: Sistem za upravljanje
optičnih elementov, stenska omarica s spojnicami, za kategoriji C in G
Fibre management systems and protective housings to be used in optical fibre
communication systems - Product specifications - Part 3-1: Fibre management system,
splice wall box, for category C & G
Systèmes de gestion des fibres et boîtiers de protection destinés à être utilisés dans les
systèmes de communication par fibres optiques - Spécifications de produits - Partie 3-1:
Boîte de montage mural ou sur poteau pour les épissures, pour les catégories C et A
Ta slovenski standard je istoveten z: prEN 50411-3-1
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
oSIST prEN 50411-3-1:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50411-3-1:2021
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oSIST prEN 50411-3-1:2021
EUROPEAN STANDARD DRAFT
prEN 50411-3-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2021
ICS Will supersede EN 50411-3-1:2012 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 3-1: Fibre management system, splice wall box, for
category C & G
Systèmes de gestion des fibres et boîtiers de protection To be completed
destinés à être utilisés dans les systèmes de
communication par fibres optiques - Spécifications de
produits - Partie 3-1: Boîte de montage mural ou sur poteau
pour les épissures, pour les catégories C et A
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-04-23.
It has been drawn up by CLC/TC 86BXA.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for 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.
Project: 68680 Ref. No. prEN 50411-3-1 E
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oSIST prEN 50411-3-1:2021
prEN 50411-3-1:2021 (E)
1 Contents Page
2 European foreword .4
3 1 Scope .6
4 1.1 Product definition .6
5 1.2 Operating environment .6
6 1.3 Reliability .6
7 1.4 Quality assurance .6
8 1.5 Allowed fibre and cable types .6
9 2 Normative references .7
10 3 Terms and definitions .8
11 4 Abbreviations . 10
12 5 Description . 10
13 5.1 Functions and configurations . 10
14 5.2 Cable seals . 11
15 5.3 Cable anchoring . 12
16 5.4 Fibre management system . 12
17 5.5 Passive optical components . 12
18 5.6 Materials . 12
19 5.7 Marking and identification . 13
20 6 Variants . 13
21 7 Dimensional requirements . 15
22 8 Tests . 16
23 8.1 Sample size . 16
24 8.2 Test sample preparation . 16
25 8.2.1 Fibre type for test samples . 16
26 8.2.2 Sealing performance test samples for boxes . 16
27 8.2.3 Optical performance test samples for boxes . 16
28 8.2.4 Test sample configuration for track or spur boxes . 17
29 8.2.5 Test sample configuration for distribution boxes . 17
30 8.3 Test and measurement methods . 18
31 8.4 Test sequence . 19
32 8.5 Pass/fail criteria . 19
33 9 Test report . 19
34 10 Performance requirements . 19
35 10.1 Dimensional and marking requirements . 19
36 10.2 Sealing, optical and appearance acceptance criteria . 19
37 10.3 Mechanical sealing performance requirements . 21
38 10.4 Environmental sealing performance requirements . 23
39 10.5 Mechanical optical performance requirements . 23
40 10.6 Environmental optical performance requirements . 26
41 10.7 Material requirements . 26
42 Annex A (normative) Fibre details for the test samples . 28
43 Annex B (normative) Sample size requirements . 29
44 Annex C (informative) Families of FMS covered in this document . 31
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prEN 50411-3-1:2021 (E)
45 Annex D (informative) Dimensions of FMS for multiple element and multiple ribbon . 33
46 Annex E (informative) Dimensions of S type FMS for Single Circuit, Single Element and
47 Single Ribbon . 34
48 Bibliography . 36
49 Figures
50 Figure 1 — Fibre management configurations in a track box . 11
51 Figure 2 — Dimensions of optical fibre splice boxes . 15
52 Figure 3 — Example configuration of track or spur box test sample. 17
53 Figure 4 — Example configuration of distribution box test sample . 18
54 Figure C.1 — Families of FMS covered in this document . 32
55 Figure D.1 — Outline dimensions of the M type FMS . 33
56 Figure E.1 — Outline dimensions of the S type FMS . 34
57
58 Tables
59 Table 1 — Optical fibre splice box, for category C and A - variants. 13
60 Table 2 — Box size selection . 14
61 Table 3 — Optical fibre splice box dimensions . 16
62 Table 4 — Sealing, optical and appearance acceptance criteria . 19
63 Table 5 — Mechanical sealing performance requirements . 21
64 Table 6 — Environmental sealing performance requirements . 23
65 Table 7 — Mechanical optical performance requirements . 23
66 Table 8 — Environmental optical performance requirements . 26
67 Table 9 — Material requirements . 26
68 Table A.1 — Fibre references for EN IEC 60793-2-50, sub-category B-652.D . 28
69 Table A.2 — Fibre references for EN IEC 60793-2-50, sub-category B-657.A1 . 28
70 Table B.1 — Minimum sample size requirements . 29
71 Table D.1 — M type FMS - Multiple element and multiple ribbon fibre . 33
72 Table E.1 — Outline dimensions of S type FMS . 35
73 Table E.2 — Maximum capacity S type FMS - SC, SE and SR . 35
74
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oSIST prEN 50411-3-1:2021
prEN 50411-3-1:2021 (E)
75 European foreword
76 This document (prEN 50411-3-1:2021) has been prepared by CLC/TC 86BXA “Fibre optic interconnect,
77 passive and connectorised components”.
78 This document is currently submitted to the Enquiry.
79 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 12 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
80 This document will supersede EN 50411-3-1:2012 and all of its amendments and corrigenda (if any).
81 prEN 50411-3-1:2021 includes the following significant technical changes with respect to
82 EN 50411-3-1:2012:
83 — update of the product category in title to Fibre management systems and protective housings;
84 — update of the product type in title to wall or pole mounted box for splices;
85 — addition of the application for pole mounting;
86 — update of the environmental categories to C and A according to EN IEC 61753-1:2018 ed2;
87 — update of the definition according to EN IEC 61753-1:2018;
88 — update of the description similar to EN 50411-3-4;
89 — replacement of the seven tables with box sizes, number of trays and splice capacity with one table
90 reducing the number of sizes to seven;
91 — deletion of box sizes V and W;
92 — improvement of the description and figures for the example configurations of box test sample
93 preparation;
94 — update of the test specifications similar to EN 50411-3-4, that are based on EN IEC 61753-1:2018;
95 — removal of the smoke emission test method that was applicable for cables only.
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oSIST prEN 50411-3-1:2021
prEN 50411-3-1:2021 (E)
Fibre management systems and protective housings to be used in optical fibre communication
systems — Product specifications —
Part 3–1: Wall or pole mounted box for splices, for category C and A
Description Typical installation configuration Typical mounting options
Vertical wall (external or internal)
Track box (2 cables minimum)
Wall or pole mounted box
Pole mounted (above ground)
Spur box (3 cables minimum)
Inside street furniture (cabinet or
Distribution box (6 cables minimum)
pedestals)
Typical fibre management configurations
Operating service environments
Applications:
EN IEC 61753-1, category C
Optical fibre cable networks. For indoor and/or for
EN IEC 61753-1, category A
external above ground applications
Fibre separation levels in Fibre Management System
Single circuit (1, 2 or 4 fibre splices per tray), Single ribbon (1 ribbon fibre splice per tray),
Single element (6, 8 or 12 fibre splices per tray), Multiple ribbon (12 ribbons fibre splices per tray)
Multiple element (144 fibre splices per tray)
Box sizes, splice capacities and dimensions
Maximum overall box
Fibre
dimensions
splice
Box size
capacity
Height
Width Depth
max.
mm mm
mm
A 24 280 450 100
G 48 400 450 150
D 72 400 600 200
E 96 460 600 180
K 144 460 610 210
L 192 420 550 180
N 288 460 600 180
NOTE Cables enter the box from underneath.
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oSIST prEN 50411-3-1:2021
prEN 50411-3-1:2021 (E)
96 1 Scope
97 1.1 Product definition
98 This document contains the dimensional, optical, mechanical and environmental performance
99 requirements of a fully installed optical fibre wall or pole mounted box for up to 288 fibre splices, in order
100 for it to be categorized as a European standard product.
101 The typical configuration is splicing of incoming fibres to optional splitters, connecting on the other side
102 to outgoing fibres.
103 A box is a protective housing containing a fibre management system with splice trays of various fibre
104 separation levels. The box can contain one or more of the following:
105 — storage and routing for fibre and cable;
106 — uncut fibre cable storage;
107 — splice trays;
108 — passive optical devices (optical splitters or WDM).
109 A box can be installed on a vertical indoor or outdoor surface above ground level. If the box is required
110 to be relocatable with cables attached, the following additional tests are expected to be performed:
111 — cable bending;
112 — cable torsion.
113 This document specifies the number of splice trays and splice capacity for each fibre separation level.
114 The maximum capacity is 288 splices. For housings with a higher number of splices, EN 50411-4-1
115 (street cabinets) can be used.
116 Boxes for fibre splice and patchcord connections are covered in EN 50411-3-4.
117 1.2 Operating environment
118 The tests selected, combined with the severity and duration, are representative of indoor and outside
119 plant for above ground environments defined by EN IEC 61753-1:
120 — category C: Controlled (indoor) environment;
121 — category A: Aerial (outdoor above ground) environment.
122 1.3 Reliability
123 Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance
124 with this document does not guarantee the reliability of the product. This is expected to be predicted
125 using a recognized reliability assessment programme.
126 1.4 Quality assurance
127 Compliance with this document does not guarantee the manufacturing consistency of the product. This
128 is expected to be maintained using a recognized quality assurance programme.
129 1.5 Allowed fibre and cable types
130 This box standard accommodates EN 60793-2-50 single-mode fibres and EN 60793-2-10 A1-OM2 to
131 A1-OM5 and A1-OM1 multimode fibres and all EN 60794 series optical fibre cables with various fibre
132 capacities, types and designs.
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133 2 Normative references
134 The following documents are referred to in the text in such a way that some or all of their content
135 constitutes requirements of this document. For dated references, only the edition cited applies. For
136 undated references, the latest edition of the referenced document (including any amendments) applies.
137 EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
138 EN 60695-11-10, Fire hazard testing - Part 11-10: Test flames - 50 W horizontal and vertical flame test
139 methods (IEC 60695-11-10)
140 EN 60754-1, Test on gases evolved during combustion of materials from cables - Part 1: Determination
141 of the halogen acid gas content (IEC 60754-1)
142 EN 60793-2-10, Optical fibres - Part 2-10: Product specifications - Sectional specification for category
143 A1 multimode fibres (IEC 60793-2-10)
144 EN IEC 60793-2-50, Optical fibres - Part 2-50: Product specifications - Sectional specification for class
145 B single-mode fibres (IEC 60793-2-50)
146 EN 61300-2-1, Fibre optic interconnecting devices and passive components - Basic test and
147 measurement procedures - Part 2-1: Tests - Vibration (sinusoidal) (IEC 61300-2-1)
148 EN IEC 61300-2-4, Fibre optic interconnecting devices and passive components - Basic test and
149 measurement procedures - Part 2-4: Tests - Fibre or cable retention (IEC 61300-2-4)
150 EN 61300-2-5, Fibre optic interconnecting devices and passive components - Basic test and
151 measurement procedures - Part 2-5: Tests - Torsion (IEC 61300-2-5)
152 EN 61300-2-9, Fibre optic interconnecting devices and passive components - Basic test and
153 measurement procedures - Part 2-9: Tests - Shock (IEC 61300-2-9)
154 EN 61300-2-12, Fibre optic interconnecting devices and passive components - Basic test and
155 measurement procedures - Part 2-12: Tests - Impact (IEC 61300-2-12)
156 EN 61300-2-22, Fibre optic interconnecting devices and passive components - Basic test and
157 measurement procedures - Part 2-22: Tests - Change of temperature (IEC 61300-2-22)
158 EN 61300-2-26, Fibre optic interconnecting devices and passive components - Basic test and
159 measurement procedures - Part 2-26: Tests - Salt mist (IEC 61300-2-26)
160 EN 61300-2-33, Fibre optic interconnecting devices and passive components - Basic test and
161 measurement procedures - Part 2-33: Tests - Assembly and disassembly of fibre optic mechanical
162 splices, fibre management systems and closures (IEC 61300-2-33)
163 EN 61300-2-34, Fibre optic interconnecting devices and passive components - Basic test and
164 measurement procedures - Part 2-34: Tests - Resistance to solvents and contaminating fluids of
165 interconnecting components and closures (IEC 61300-2-34)
166 EN 61300-2-37, Fibre optic interconnecting devices and passive components - Basic test and
167 measurement procedures - Part 2-37: Tests - Cable bending for fibre optic closures (IEC 61300-2-37)
168 EN 61300-3-1, Fibre optic interconnecting devices and passive components - Basic test and
169 measurement procedures - Part 3-1: Examinations and measurements - Visual examination
170 (IEC 61300-3-1)
171 EN 61300-3-3, Fibre optic interconnecting devices and passive components - Basic test and
172 measurement procedures - Part 3-3: Examinations and measurements - Active monitoring of changes
173 in attenuation and return loss (IEC 61300-3-3)
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174 EN 61300-3-28, Fibre optic interconnecting devices and passive components - Basic test and
175 measurement procedures - Part 3-28: Examinations and measurements - Transient loss
176 (IEC 61300-3-28)
177 EN 61756-1, Fibre optic interconnecting devices and passive components - Interface standard for fibre
178 management systems - Part 1: General and guidance (IEC 61756-1)
179 3 Terms and definitions
180 For the purposes of this document, the following terms and definitions apply.
181 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
182 — ISO Online browsing platform: available at https://www.iso.org/obp
183 — IEC Electropedia: available at http://www.electropedia.org/
184 3.1
185 active fibre
186 live fibre
187 fibre in an optical circuit or node that is carrying an optical signal
188 3.2
189 box
190 free breathing protective housing that is permanently attached to a vertical wall or pole
191 Note 1 to entry: A box is not specifically designed to allow cable movement (e.g. torsion, bending) at the cable
192 ports during operation.
193 3.3
194 cable element
195 grouping of fibres in the cable sheath
196 3.4
197 fan-out
198 passive optical component providing a transition between a single ribbon or single element into
199 individual fibres
200 3.5
201 fibre management system for fibre splicing
202 system to control, protect and store splices, passive optical components and fibres from incoming to
203 outgoing cables
204 Note 1 to entry: A fibre management system is intended for installation within a protective housing.
205 Note 2 to entry: A fibre management systems is often called an “organiser”.
206 3.6
207 free breathing housing
208 protective housing that allows a free exchange of air with the environment
209 Note 1 to entry: Limited water ingress and/or limited dust ingress is possible. Free breathing housings are not
210 intended for use in areas that are subject to flooding or water immersion. Free breathing housings are used in aerial
211 environments for the interconnection of cables.
212 Note 2 to entry: A free breathing housing is not designed to hold a varying overpressure or underpressure caused
213 by temperature changes or atmospheric pressure changes.
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214 3.7
215 microduct
216 small, flexible lightweight tube with an outer diameter between 3 mm and 16 mm
217 3.8
218 multiple element
219 ME
220 physical fibre separation level consisting of more than one single element
221 Note 1 to entry: This separation level has fibres from multiple cable elements on one splice tray and is also called
222 mass storage. It is the lowest (worst) degree of physical circuit separation.
223 3.9
224 multiple ribbon
225 MR
226 multiple element consisting of multiple optical fibres (circuits) arranged in ribbons (fibres in parallel)
227 which are arranged e.g. in stacks
228 3.10
229 passive optical component
230 optical component or assembly which does not require any source of energy for its operation other than
231 optical input signals, or controls the dynamic or static characteristics of optical signals using a source of
232 energy
233 Note 1 to entry: A passive optical component never generates an optical gain of signal power.
234 Note 2 to entry: Examples include optical attenuators and passive branching devices.
235 3.11
236 protective housings
237 indoor and outdoor housings utilised for the storage, distribution or protection of one or more cable joints
238 or passive or active telecom equipment
239 Note 1 to entry: Examples of protective housings include: boxes, cabinets, cases, optical distribution frame sub
240 racks, closures or pedestals. A closure can be either a “sealed closure” or a “free breathing closure”.
241 Note 2 to entry: A protective housing contains a fibre management system.
242 3.12
243 single circuit
244 SC
245 physical fibre separation level where the optical circuit consists of one fibre (single fibre), or more than
246 one fibre, providing all services for one subscriber
247 Note 1 to entry: This fibre separation level has the fibre(s) of only one customer on one splice tray. It is the highest
248 (best) degree of physical circuit separation. Single circuit minimizes the disturbance of the operated circuits when
249 accessing any adjacent circuit.
250 3.13
251 single element
252 SE
253 physical fibre separation level in the cable subassembly comprising one or more optical fibres inside a
254 common covering e.g. in a tube or inside one groove of a grooved cable (slotted core cable)
255 Note 1 to entry: A single element provides services to more than one subscriber.
256 Note 2 to entry: This fibre separation level has all fibres from a cable element (e.g. loose tube) on one splice tray.
257 It is an intermediate degree of physical circuit separation (between single circuit and multiple element).
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258 3.14
259 single ribbon
260 SR
261 physical fibre separation level with all fibres grouped in one ribbon
262 Note 1 to entry: Depending on the fibres’ deployment, a single ribbon can contain all the fibres of one circuit
263 (single circuit) or the fibres of more than one circuit (single element).
264 3.15
265 splice tray
266 structure that organises and controls storage of fibre splices in an orderly manner, together with the
267 associated excess uncabled fibre length
268 Note 1 to entry: A splice tray is a part of the fibre management system.
269 3.16
270 transient loss
271 short term (milliseconds) reversible change of optical transmission characteristics arising from optical
272 discontinuity, physical defects and modifications of the attenuation (e.g. bend loss) normally caused by
273 mechanical stress
274 3.17
275 uncut fibre
276 fibres from a continuous cable with the cable sheath removed over a defined length
277 Note 1 to entry: Uncut fibres typically comprise a section of cable where the cable sheath has been removed and
278 the cable tubes or uncut fibres are cleaned as for installation. These uncut tubes or fibres are then stored, usually
279 inside a protective housing, in a loop. When required the fibres or tubes are then cut and the fibres connected or
280 spliced.
281 4 Abbreviations
282 For the purposes of this document, the following abbreviations apply.
FMS Fibre Management System
FTTH Fibre to the Home
ME Multiple Element
MR Multiple Ribbon
NA Not applicable
SC Single Circuit
SE Single Element
SR Single Ribbon
WDM Wavelength Division Multiplexer
283 5 Description
284 5.1 Functions and configurations
285 An optical fibre box is a housing that
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