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FTTH Conference Milan 2011 Day 2
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Date et page . 1
FTTH deployment acceleration thanks to extraction techniques
Real Helvenstein & Jean Fehlbaum
Seite . 2Nexans – Optical Fibres Cables & Components BG
INTRODUCTION
In western Europe the development of FTTH networks is following several important trends :
1. Mutualisation : from single fibre « Open Access » networks to multi-fibre multi-operator networks
2. Hybridation : combination between P2P interconnections for enterprise networks and GPON for residential customers
3. Extensive reuse of existing ROWs (Right-of-ways) : the most favourable infrastructure for FTTH deployment is chosen for the mutualisation (generally incumbent operators, but sometimes also CATV operators or utilities)
4. Major issue : cost reduction and risk sharing between competitors (legal, technical and commercial issue) => deployment capex reduction
Seite . 3Nexans – Optical Fibres Cables & Components BG
FTTH Pilot project 2010
P2P project 400% / Cooperation ILEC - Utilities
Seite . 4Nexans – Optical Fibres Cables & Components BG
Underground cable laying :
Classical pulling
Classical blowing
Micro-blowing
Micro-bundleextraction
+ +
Innovations in cable laying techniques=> Importance of infrastructure sharing
Micro-cables in power cablesNano-cables in telecom-nano-ducts
Seite . 5Nexans – Optical Fibres Cables & Components BG
Micro-ducts network with duct branching
Classical splicing and branching
Classical midspan technique
Straight midspan technique without extraction
Straight midspan technique with extraction
Straight midspan technique with extraction and repair possibility
Innovations in cable branching techniques
Seite . 6Nexans – Optical Fibres Cables & Components BG
Cable reserve in the branch-off location (6 to 10m).
Optical fibres standard cable
Cable reserve
Building 1Building 2 Building 3
Classical midspan branching technique
Seite . 7Nexans – Optical Fibres Cables & Components BG
Cable reserve in the branch-off location (6 to 10m).
Flexibility point
Branching closure with midspan technique
WCT 1.5
Classical midspan branching technique
Building 1Building 2 Building 3
Conditions :1. Manhole2. Cable reserve3. Splicing
Seite . 8Nexans – Optical Fibres Cables & Components BG
Creating the customer ConnectionsSequence of steps to extract a nano-drop cable at each subscriber site and
create a loop back to utilise all the available nano-drop modules
Cable
Central bundle with distribution fibre
DP loop back splice enclosure
4. Second extraction of the nanodrop cable
3. Extract the nano drop cable for routing
to building entry
2. cut of the extractable nano
drop cable at upstream location
1. Splice fibres from the extracted nano-drop cable to
the fibres in the inner layer tubes
Dry nano-tube containing the extractable nano-drop cable
Fibre splices
New straight midspan branching technique with extraction (spliceless)
Cable Sheath Aperture (protected by
extraction enclosure).
Seite . 9Nexans – Optical Fibres Cables & Components BG
FRANCEISSUE 2 DIFFERENTIATION:
TCO analyse and value transfer
Patent pending~3’000 kilometers already installed
Conditions :1. Handhole2. No cable reserve3. No splicing
Seite . 10Nexans – Optical Fibres Cables & Components BG
OPEX Optimization
New demand from the market : repairability Avoid cumulative transmission degradation caused by multiple repairs All the optical fibres micro and nanocables are movable inside the main
cable structure
Design (2 fibre variant shown)1 : 250um coated fibre2 : Aramid reinforcement yarns3 : LSHF Fire retardant sheathPatent pending
Seite . 11Nexans – Optical Fibres Cables & Components BG
LBC
User 24 User 14 User 13 User 12 User 11
DP
User 1
OSP Pull Back Cable repair.Initial configuration Distribution fibers
nanodrops
User microduct
Branching box
. . . . . .
Seite . 12Nexans – Optical Fibres Cables & Components BG
LBC
User 24 User 14 User 13 User 12 User 11
DP
User 1
User microduct
Branching box
. . .. . .
OSP Pull Back Cable repair.Incident on main cable
Seite . 13Nexans – Optical Fibres Cables & Components BG
LBC
User 24 User 14 User 13 User 12 User 11
DP
User 1
User microduct
Branching box
. . .. . .
OSP Pull Back Cable repair.Incident on main cableRemoval of faultive microcable and nanocables
Seite . 14Nexans – Optical Fibres Cables & Components BG
LBC
User 24 User 14 User 13 User 12 User 11
DP
User 1
User microduct
Branching box
. . .. . .
OSP Pull Back Cable repair.Incident on main cableRemoval of faultive microcable and nanocablesRepair of cable : pneumatic continuity
Seite . 15Nexans – Optical Fibres Cables & Components BG
LBC
User 24 User 14 User 13 User 12 User 11
DP
User 1
User microduct
Branching box
. . .. . .
OSP Pull Back Cable repair.Incident on main cableRemoval of faultive microcable and nanocablesRepair of cable : pneumatic continuityRe-installation of the microcable and nanocables
Seite . 16Nexans – Optical Fibres Cables & Components BG
Cost comparison between all branching techniques
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
Direct Buried µduct/µcable cabling on demand
µduct/µcable all at once
Cable with nanoduct/nanocable
Optical cables Optical components µduct system Field workforce
Seite . 17Nexans – Optical Fibres Cables & Components BG
CONCLUSION
Advantages of extraction techniquesCapex reduction of > 30% in the outside
plant.
Avoids splicing operations in the branching points.
Accelerates deployment in the distribution network.