Fibre optic access to end-user - A guideline to building of FTTX fibre optic network

The purpose of this report is to be a guideline for those considering to install a high bandwidth (high bit-rate) FttX-network. After studying the report, operators, communities, energy companies, installers and others will understand the necessary steps to take to plan and install networks with high quality and cost effectiveness, and to secure a uniform structure and a high quality level on such networks.

Lichtwellenleiterzugang zum Endkunden - Leitfaden für die Erstellung von FTTx-Lichtwellenleiternetzen

Accès à l’utilisateur par fibres optiques - Lignes directrices relatives à la construction d’un réseau en fibres optiques de type FttX

Dostop prek optičnih vlaken do končnega uporabnika - Napotki za gradnjo optičnega omrežja FTTX

General Information

Status
Published
Publication Date
10-Oct-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Oct-2021
Due Date
12-Dec-2021
Completion Date
11-Oct-2021

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SLOVENSKI STANDARD
SIST-TP CLC/TR 50510:2021
01-december-2021
Nadomešča:
SIST-TP CLC/TR 50510:2013
Dostop prek optičnih vlaken do končnega uporabnika - Napotki za gradnjo
optičnega omrežja FTTX

Fibre optic access to end-user - A guideline to building of FTTX fibre optic network

Lichtwellenleiterzugang zum Endkunden - Leitfaden für die Erstellung von FTTx-
Lichtwellenleiternetzen

Accès à lutilisateur par fibres optiques - Lignes directrices relatives à la construction dun

réseau en fibres optiques de type FttX
Ta slovenski standard je istoveten z: CLC/TR 50510:2021
ICS:
33.180.99 Druga oprema za optična Other fibre optic equipment
vlakna
SIST-TP CLC/TR 50510:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CLC/TR 50510:2021
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SIST-TP CLC/TR 50510:2021
TECHNICAL REPORT CLC/TR 50510
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
October 2021
ICS 33.180.99 Supersedes CLC/TR 50510:2012
English Version
Fibre optic access to end-user - A guideline to building of FTTX
fibre optic network

Accès à l'utilisateur par fibres optiques - Lignes directrices Lichtwellenleiterzugang zum Endkunden - Leitfaden für die

relatives à la construction d'un réseau en fibres optiques de Erstellung von FTTx-Lichtwellenleiternetzen

type FttX
This Technical Report was approved by CENELEC on 2021-08-09.

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. CLC/TR 50510:2021 E
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SIST-TP CLC/TR 50510:2021
CLC/TR 50510:2021 (E)
Contents Page

European foreword ........................................................................................................................................... 8

1 Scope .......................................................................................................................................................... 9

2 Normative references ................................................................................................................................ 9

3 Terms, definitions and abbreviations ...................................................................................................... 9

3.1 Terms and definitions ........................................................................................................................ 9

3.2 Abbreviations ................................................................................................................................... 10

4 Network structure and nodes ................................................................................................................. 13

4.1 General ............................................................................................................................................ 13

4.2 Access network ............................................................................................................................... 13

5 FTTX communication system ................................................................................................................ 14

5.1 General ............................................................................................................................................ 14

5.2 PON technologies ........................................................................................................................... 14

5.3 Optical budget classes and PON technologies ............................................................................... 15

5.4 Introduction of new PON technologies ............................................................................................ 16

6 FTTX passive network products and system solutions ...................................................................... 17

6.1 General ............................................................................................................................................ 17

6.2 Optical fibres ................................................................................................................................... 17

6.2.1 General .............................................................................................................................. 17

6.2.2 Choice of optical fibre type ................................................................................................ 18

6.2.3 Number of optical fibres provided to each end-user .......................................................... 19

6.3 Cables and ducts............................................................................................................................. 19

6.3.1 General .............................................................................................................................. 19

6.3.2 Construction specifications for fibre optical cables ............................................................ 20

6.3.3 Cable constructions for various installation methods ........................................................ 22

6.3.4 Hybrid cables ..................................................................................................................... 30

6.3.5 Drop cables ........................................................................................................................ 31

6.4 Connectivity products and solutions................................................................................................ 33

6.4.1 Connectors in the FTTX-network ....................................................................................... 33

6.4.2 Optical fibre splicing ........................................................................................................... 35

6.4.3 Pre-connectorised fibre ...................................................................................................... 36

6.5 Optical splitters ................................................................................................................................ 36

6.5.1 General .............................................................................................................................. 36

6.5.2 Functional performance attributes ..................................................................................... 36

6.6 Fibre organizers and closures ......................................................................................................... 36

6.6.1 Closures ............................................................................................................................. 36

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6.6.2 Optical Distribution Frame (ODF) ...................................................................................... 37

6.7 System design ................................................................................................................................. 38

6.7.1 Link dimensioning .............................................................................................................. 38

6.7.2 Calculation of an optical power budget .............................................................................. 39

7 Network design ........................................................................................................................................ 40

7.1 Overview ......................................................................................................................................... 40

7.2 Cabling implementation ................................................................................................................... 40

7.2.1 Optical fibre cabling ........................................................................................................... 40

7.2.2 Pulling, burying and blowing .............................................................................................. 41

7.2.3 Trenching ........................................................................................................................... 42

7.2.4 Right of Way (RoW) solution ............................................................................................. 44

7.2.5 Access and jointing chambers ........................................................................................... 48

7.3 Areas with Multi-Dwelling Units (MDUs) ......................................................................................... 48

7.4 Areas with detached houses ........................................................................................................... 50

7.5 Rural areas ...................................................................................................................................... 51

7.6 General considerations when designing a network ........................................................................ 52

8 Planning.................................................................................................................................................... 52

8.1 General ............................................................................................................................................ 52

8.1.1 Outline planning ................................................................................................................. 52

8.1.2 Development of outline plans ............................................................................................ 53

8.1.3 Detailed planning ............................................................................................................... 54

8.2 Installation – General advice ........................................................................................................... 55

8.2.1 Drilling ................................................................................................................................ 55

8.2.2 Lift shaft ............................................................................................................................. 55

8.2.3 Messages to residents ....................................................................................................... 55

8.2.4 Insurance and compensation for damage ......................................................................... 55

8.2.5 Certificate ........................................................................................................................... 55

8.3 Installation in access nodes ............................................................................................................ 55

8.3.1 Access node ...................................................................................................................... 55

8.3.2 Area for splice cabinet – Optical fibre concentration point (FCP) ...................................... 56

8.3.3 In a flat, a house or similar area (user node – subscriber node) ....................................... 57

9 Quality ....................................................................................................................................................... 57

Annex A (Informative) List of standards ..................................................................................................... 58

Annex B (Informative) Examples of fibre optic cables – designs vs. application .................................. 72

B.1 Direct buried fibre optic cables ........................................................................................................ 72

B.2 Fibre optic duct cables .................................................................................................................... 73

B.3 Fibre optic microduct cables ........................................................................................................... 75

B.4 All Dielectric Self Supporting aerial fibre optic cables ..................................................................... 75

B.5 Aerial fibre optic figure-8 cables ...................................................................................................... 76

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B.6 OPGW aerial fibre optic cables ....................................................................................................... 77

B.7 Indoor extractable/pull back cable ................................................................................................... 78

B.8 Indoor/outdoor drop cables ............................................................................................................. 79

Annex C (Informative) Examples of ducts and micro-ducts ..................................................................... 80

Annex D (Informative) Example of GPON access network in multi dwelling units (MDUs) with

pre-connectorised solution .................................................................................................................... 82

Annex E (Informative) Installation ............................................................................................................... 84

E.1 Introduction ...................................................................................................................................... 84

E.2 Underground work ........................................................................................................................... 84

E.3 Aerial installation ............................................................................................................................. 91

E.4 Indoor installation ............................................................................................................................ 93

E.5 Commission and acceptance of completed networks ..................................................................... 93

E.6 Safety, risks and risk elimination ..................................................................................................... 94

Annex F (Informative) Measurements, documentation and operation .................................................... 96

F.1 Measurements ................................................................................................................................. 96

F.2 Labels and marking ......................................................................................................................... 96

F.3 Operation and maintenance .......................................................................................................... 101

Bibliography .................................................................................................................................................. 102

Figures
Figure 1 — Example for a Point-to-Point Access Network 13
Figure 3 — PON wavelengths allocation 14
Figure 4 — WDM1r: GPON and XG(S)-PON 17
Figure 5 — CEx: GPON, XG(S)-PON and NG PON2 17
Figure 6 — Duct filling optimization with low diameter cables 22
Figure 7 — Different constructions of direct buried cables 23
Figure 8 — Cable profile when installed on a horizontal span (F = force) 24
Figure 9 — Climatic load 24
Figure 10 — Different constructions of 144 optical fibre ADSS cables for FTTX 25

Figure 11 — Different constructions of 144 optical fibre reinforced double sheath ADSS cables for FTTX25

Figure 12 — Different constructions non-dielectric reinforcement - single sheath FTTX Figure-8 cables 26

Figure 13 — Indoor straight mid-span access riser cable and accessories 27
Figure 14 — Outdoor straight mid-span access cable 28
Figure 15 — Outdoor distribution box for straight mid-span access cable 28
Figure 16 — Examples of hybrid cables 31

Figure 17 — Examples of indoor drop cables for installation by pulling in a tube or along a wall 31

Figure 18 — Different constructions of flat pushable low friction all dielectric drop cables 32

Figure 19 — Indoor/outdoor drop cable – mono-sheath structure 32
Figure 20 — Indoor/outdoor drop cable –double sheath strippable structure 32
Figure 21 — Examples of single fibre ferrule based connector types 33
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Figure 22 — Dome, Pan and Inline closures 36
Figure 23 — Different organizers 37
Figure 24 — “Y”, “T”, and “X” closures 37
Figure 25 — A model for calculation of optical attenuation 39

Figure 26 — Optical fibre installations planned in “cells” with the optical fibre volume focused to the

access node 41

Figure 27 — Optical fibre structure in sparsely populated areas with concentration of optical fibres to a

node 42
Figure 28 — Trenching (Source: DTAG) 43

Figure 29 — Milling wheel in the ditch (Source: Leonhard Weiss GmbH and Co. KG) 43

Figure 30 — Existing infrastructure – possible host for optical fibre cable deployment 45

Figure 31 — Schematic description of the installation of cables in sewer pipe systems 45

Figure 32 — Laying procedure pipeline section in a simplified sketch 46

Figure 33 — A house connection gas pipe is used to bridge the distance to the customer 47

Figure 34 — Adapter for getting in and outside the gas pipe 47
Figure 35 — A simplified sketch for a drinking water line 47

Figure 36 — A house connection water pipe is used to span the distance to the customer 48

Figure 37 — Network in an area of MDUs 49
Figure 38 — MDUs in cross-section 49

Figure 39 — Metropolitan/urban network for areas with detached/terraced houses 50

Figure 40 — direct connected houses 51
Figure 41 — Metropolitan/urban network for rural areas 52
Figure 42 — Curves illustrating influence and costs in an FTTX-project 53
Figure 43 — Proposal of the design of a node room 56

Figure B.1 — Central Loose Tube Fibre Optic Cable - Dry Core - Armored - Double Sheath 72

Figure B.2 — Loose Tube Fibre Optic Cable - Armoured - Dry Core - Double Sheath 72

Figure B.3 — Micromodule Optic Cable - Armoured (dielectric)- Dry Core - Double Sheath 72

Figure B.4 — Micromodule Optic Cable - Armoured (metallic)- Dry Core - Double Sheath 73

Figure B.5 — Loose Tube Fibre Optic Cable - Armoured - Dry Core - Double Sheath 73

Figure B.6 — Loose Tube Fibre Optic Cable - Non Armoured - Dielectric - Dry Core 73

Figure B.7 — Micro-module structure - dielectric reinforcement - watertight dry core - single sheath 74

Figure B.8 — Micro-module structure - dry core - stainless steel tape armour - peripheral metallic wires -

single sheath 74

Figure B.9 — Slotted Core Fibre Optic Ribbon Cable - Non Armoured - Dielectric - Dry Core – Single

Sheath 74

Figure B.10 — Loose buffer tube structure - central dielectric reinforcement - single sheath 75

Figure B.11 — Loose buffer tube structure - double sheath 75

Figure B.12 — Unitube structure - central dielectric reinforcement - single sheath 75

Figure B.13 — Micro-module structure - watertight dry core - dielectric reinforcement - single sheath 75

Figure B.14 — Micro-module structure - watertight dry core - dielectric reinforcement - double sheath 75

Figure B.15 — Loose tube structure - watertight dry core - dielectric reinforcement - double sheath 76

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Figure B.16 — Loose tube structure - watertight dry core - dielectric reinforcement - double sheath 76

Figure B.17 — Unitube structure - dielectric reinforcement - single sheath 76

Figure B.18 — Micro-module structure - non-dielectric reinforcement - single sheath – Figure 8 76

Figure B.19 — Loose tube structure - non-dielectric reinforcement - single sheath – Figure 8 77

Figure B.20 — Unitube structure - dielectric reinforcement - single sheath – Figure 8 77

Figure B.21 — Aluminium tube/pipe OPGW 77
Figure B.22 — Strainless steel buffer tube OPGW 78
Figure B.23 — Riser extractable/pull back cable 78
Figure B.24 — Window cut and fibre unit extraction 78
Figure B.25 — Indoor cable with buffered fibre (simplex) 78
Figure B.26 — Indoor cable with buffered fibres (duplex) 79
Figure B.27 — Indoor buffered fibre cable 79
Figure B.28 — Indoor multi-fibre tube cable (micro distribution cable) 79
Figure B.29 — Indoor/outdoor drop cable – mono-sheath structure 79
Figure B.30 — Indoor/outdoor drop cable – double sheath strippable structure 79
Figure D.1 — Top view of roads and high riser buildings 82
Figure D.2 — Example of a high riser optical infrastructure 83
Figure E.1 — Duct preparation through ploughing 86

Figure E.2 — Duct installation with ploughing, milling and mini or micro milling 87

Figure E.3 — Installation of sub-ducts 88
Figure E.4 — Sub-ducts in 100 mm ducts 88
Figure E.5 — Installation with pulling rope 90
Figure E.6 — Installation with pulling rope 90
Figure E.7 — Installation with motor driven cable feeder. 91
Figure E.8 — Blocking coils at the immediate vicinity of the anchor clamps. 92
Figure E.9 — Blocking coils at the immediate vicinity of the anchor clamps. 92
Figure F.1 — Example of marking of fibre installation 97

Figure F.2 — Example of documentation for an FTTX-installation with a principle sketch of wiring 99

Figure F.3 — Example of an installation with physical lines (micro-ducts inserted into existing VP-20-ducts

to power central) 100
Figure F.4 — Example of final documentation for a property 100
Tables
Table 1 — GPON technology 15
Table 2 — XG-PON and XGS-PON technology 15
Table 3 — NGPON2 technology 16
Table 4 — Multi-PON Module cards 17
Table 5 — Single-mode fibre types as defined in ITU and CENELEC/IEC 18
Table 6 — Key features of EN IEC 60793-2-50 B-657 19

Table 7 — Attenuation of respectively 1 m and 2 m of fibres bent in 15 mm radius storage cassette

according to the B-657 fibre type 19
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Table 8 — CPR classes summary 21
Table 9 — Typical micro-duct dimensions 30
Table 10 — Proposed connection requirements for FTTX infrastructures 34
Table C.1 — Examples of bundled micro-ducts 80
Table C.2 — Examples of micro-ducts in combination with HDPE main ducts 80
Table C.3 — Examples of micro- and mini-ducts 81
Table E.1 — Safety aspects 94
Table F.1 — Examples of duct identification 98
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SIST-TP CLC/TR 50510:2021
CLC/TR 50510:2021 (E)
European foreword

This document (CLC/TR 50510:2021) has been prepared by CLC/TC 86A, “Optical fibres and optical fibre

cables”.
This document supersedes CLC/TR 50510:2012.

CLC/TR 50510:2021 includes the following significant technical changes with respect to

CLC/TR 50510:2012:
a) Complete restructuring of the document.

b) Addition of information on new PON systems and on overhead cables installations.

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.
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SIST-TP CLC/TR 50510:2021
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1 Scope

This document is a revision of CLC/TR 50510 Ed2 published in 2012. At the time that Ed2 was published,

no comprehensive document on fibre access networks was available, and few FTTX networks had been

deployed. Since then, massive deployments have occurred in most European countries, even if a lot more

remains to be rolled out, and guides are now available from organizations such as FTTH council Europe.

This new edition of CLC/TR 50510 takes lessons from the experience gained all along those deployments

and, and refers to existing documents where relevant. It addresses the impacts of the new generation of

communication systems on the access networks and components. More specifically, it provides guidelines

towards the IEC and CLC standards relating to the access networks and their technologies.

Like the first and second edition, this one addresses FTTX networks in general and includes:

— FTTC = Fibre to the Curb, meaning to the street (to a cabinet);
— FTTB = Fibre to the Building, normally into the basement;

— FTTH/P = Fibre to the Home/Premise, meaning to a building in a residential area.

It is as well of relevance for:
— FTTE = Fibre to the Enterprise,
— FTTA = Fibre to the Antenna.
This document is subdivided into five main clauses:

— Network Structure and Nodes: introduces the telecommunications infrastructures and provides an

overview of the basic structure for the FTTX network

— FTTX Communication System: introduces the next generation communication systems that will be run

on the FTTX networks

— FTTX passive network products and system solutions: describes system implementations for FTTX

including requirements on products and installation techniques

— Network design: provides guidance on how to create a network and gives an overview of applicable

network topologies.

— Planning: provides basic information in relation to various installation practises and the planning

relevant to those practises
Valuable information is also available in the annexes.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviations
3.1 Terms and definitions
No terms and definitions are listed in this document.
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3.2 Abbreviations
AAL Ambient Assisted Living, also known as Active Assisted Living
ADSL Asymmetric Digital Subscriber Line
APC Angled Physical Contact
APON Asynchronous transfer mode Passive Optical Network (ITU-T G.983)
ATM Asynchronous Transfer Mode
BPON Broadband Passive Optical Network (ITU-T G.983)
CAPEX CApital EXpenditures (investments)
CATV CAble TeleVision
CE Commission Européenne
CENELEC Comité Européen de Normalization en Electronique et en éLECtrotechnique
CEN Comité Européen de Normalization
CLC CENELEC
CPD Construction Product Directive
CPR Construction Product Regulation
CWDM Coarse Wavelength Division Multiplexing
DOCSIS Data Over Cable Service Interface Specification
DP Distribution Point
DWDM Dense Wavelength DIvision Multiplexing
EQF Equipment Frame (for transmission equipment)
EPON Ethernet Passive Optical Network (IEEE 802.3ah)
ETSI European Telecommunications Standards Institute
EU European Union
FCCN Fibre Cross Connect Node
FCP Fibre concentration point
FDF Fibre Distribution Field
FMS Fibre Management System
FMSC Fibre Management System Closure
FTTB Fibre To The Building
FTTC Fibre To The Curb
FTTH Fibre To The Home
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FTTX FTT(X stands for B, C, H, etc.): Generic term for FTTB, FTTC, FTTH, etc.
FRNC Flame Retardant Non Chloric (halogen free)
FWA Fixed Wireless Access
GB Giga Byte
Gbit/s Giga bits per second
GPON Gigabit capable Passive Optical Network (ITU-T G.984)
HDPE High Density PolyEthylene
HFFR-LS Halogen Free Flame Retardant Low Smoke
IEEE Institute of Electrical and Electronics Engineers
IL Insertion Loss
IP Internet Protocol
ISO International Organization for Standardization
ITU International Telecommunication Union
ITU-R International Telecommunication Union - Radio-communications
ITU-T International Telecommunication Union - Telecommunications
LC Little Connector
LFH Low Fire Hazard
LI Local Interface
LSZH Low Smoke Zero Halogen
Mbit/s Mega bits per second
MDU Multi Dwelling Unit
MMF Multimode Fibre
NG-PON Next-Generation Passive Optical Network
ODF Optical Distribution Frame
OLT Optical Line Terminal
ONT Optical Network Terminal
OPGW Optical Ground Wire
OTDR Optical Time Domain Reflectometry
P2P Point to Point
P2MP Point to Multiple Points
PE PolyEthylene
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Plenum Horizontal cabling (system)
PMD Polarization Mode Dispersion
PMF Patch cable Management Frame
PON Passive Optical Network
POP Point of Presence
PPF Patch Panel Frame
PtP Point to Point
PVC Polyvinylchloride
Riser Vertical cabling (system)
RL Return Loss
RoW Right of Way
SC Standard Connector
SDP Small Distribution Point
SDU Single Dwelling Unit
SMF Single Mode Fibre
S/N Signal to Noise
TC Technical Committee
TR Technical Report
UPS Uninterruptible Power System
VDSL Very high bitrate Digital Subscriber Line
WDM Wavelength Division Multiplexing
WLAN Wireless local area network
XG-PON 10 (X stands 10) Gigabit Passive Optical Network
XGS-PON 10 (X stands 10) Gigabit Symmetrical Passive Optical Network
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