TRIBAN Workshop CNET BERN 17-19 November 1998 1 From the device to the outside plant installation practice Daniel Lecrosnier France Telecom /CNET CH :

BERN 17-19 November 1998 1

TRIBAN Workshop

CNET

From the device to the outside plant installation practice

Daniel Lecrosnier

France Telecom /CNET

CH : L. Budry, C. Zimmer

DT : B. Jacobs

FT : F. Bourgart, D. Jugan, C. Kazmierski, A. Madani, S. Mottet

HT : G. Gerdai, P. Jeszenoi, K. Szomolanyi

PT : M. Pousa, Ana Cristina

TE : D. Collins

TI : P. Bradley, N. Caponio, G. Ciochetto, G. Destefanis, A. Gnazzo

Sonera Ltd : A. Immonen

The role of technology

daniel. [email protected]


TRIBAN Workshop

CNET

Presentation outline

• P614 Task 4 : broadband access enabling technologies

• FTTx infrastructures : requirements & challenges

• xDSL: hardware analysis

• Power Lines communications

• Conclusions


TRIBAN Workshop

CNET

Task4 : addressing basic technologies

State of the art and evolutions

Cost figures & standardisation issues

FTTx: Optoelectronic modules

Optical cabling technologies

Point to point / point to multipoint links

Measurements and maintenance of the hardware

Opportunities for WDM technologies in access

Powering

Civil work

Installation techniques

Copper: xDSL techniques Power lines communications

ANCIT workshop Torino March 98


TRIBAN Workshop

CNET

FTTx infrastructure : hardware & civil work

FTTC/Cab

FTTB

FTTH

FTTF /O

Manhole

Duct Duct / direct buried

LEX

O

L

T

MDFOM

Cables : Connectors :

Splices in enclosure : Splitter :

MDF : main distribution fram e OM : optical monitoring

ONU

ONU

ONUONU

ONU

ONU

(HFC)

(HFR)


TRIBAN Workshop

CNET

Optical access network : specific requirements

1. Reduce the costs: O/E conversion

hardware, installation, civil works

2. Overcome many environmental constraints:

. aerial cables (humidity, temperature variations, UV, wind, frost, snow, shots) :

special fibre/cable design, robust connecting technologies

. cable installation using copper civil work (overlay deployment) :

low diameter, high density fibre cables

. many branching points : easy splicing, fast connector mounting

. indoor cabling : low curvature radius fibre/cable

. customer installation : hardware must be secure, robust and friendly to handle


TRIBAN Workshop

CNET

ATM/PON standard from FSAN

Optical Transmission 2 fibres 1fibre 1fibre WDM WDM

1.3µm 1.3 1.5 1.3+ 1.3-

Bit rate (Mbit/s) between Downstream UpstreamOLT and ONUSymmetric 155 155.52 155.52Asymmetric 622 622.08 155.52

Optical path loss 10 - 25 dB (G.982 Class B)15 - 30 dB (G.982 Class C)

Differential path loss 15 dB

Overall reflectance at S/R points 32 dB

Temperature FTTH ONU 0 to 60°C (case temperature)- 40 to +85°C (storage)


TRIBAN Workshop

CNET

O/E module road map

Integrated optical module

1990

Hybrid optical module

1

2

1, 2

Fibre

InP

(Planar Lightwave Circuit)

Evolution ofTechnologies

Waveguide Photodiode

Laser with spot size converterWDM mux/dmux

PLC Si platform

Years2000

Micro-optics


TRIBAN Workshop

CNET

Basic cost of O/E modules

Data rate 155 Mbit/s

1996FSAN data

100

200

300

400

500

102 103 104 105 106

Micro-optics trend

PLC Hybrid Integration

PR

ICE

(U

S $

)

PRODUCTION VOLUME/YEAR

40 dollars

1998 micro-optic


TRIBAN Workshop

CNET

Cabling technologies : feeder section

Low diameter, low weight, high density optical cables are available

62 mm

5500 kg/km

21mm

363 kg/km

448 copper pairs 648 optical fibres

Cost of standard G652 fibre in cable is about 2 times the copper pair’s


TRIBAN Workshop

CNET

Cabling technologies : drop & CPN

Need for cables with few single mode fibres

- hard environment- today G652 fibre diameter bend : 60 to 40 mm - improved fibre : less sensitive to strain, new coatings

20 mm target Alternative fibres :

- Multimode silica fibre- Plastic clad silica fibre

- Plastic fibre easy to connect (indoor use) - fibre still at evaluation stage

- cost?

easy to connect


TRIBAN Workshop

CNET

Cabling technologies

Com pressed air

Pushing and blow ing head

M ic ro du c tCab le

Air tight pistonJo in t b o x

E ne rgy

Cab le

trans p08.ds 4

Installation with blowing techniques (ANCIT workshop)

First patents from BT :blowing of optical fibre unit- up to 6 fibres- range: up to 800 meters

Extended to cables pulling/blowing - range : up to 2400 meters


TRIBAN Workshop

CNET


Micro cable micro civil work

Micro Cabling System from Siemens(ANCIT workshop)


TRIBAN Workshop

CNET


Connectors : field mounting is recognised as a critical issue

Innovations are expected :

- simplified mounting procedure - ceramic ferrule replaced by glass, plastic - ferrule-less connector - multi-fibre connectors, miniaturisation - easy fibre preparation, polishing (?)

Splices- fusion : preferred by most operators but high cost (40$)- mechanical : under field test

Advanced solutions :

- MT - RJ system - VF- 45 - SC Light Crimp - Optoclip


TRIBAN Workshop

CNET

Cabling technologies : splitters

PLANAR GLASS

PLANAR GLASS

FIBRE

FIBRE

FIBRE

PLC

PLC

3 technologies : - fibre - planar glass - PLC

- High cost : 50 EURO per port

- Location is still an open question - in the field (near customer premises) - at local exchange

QUANTITIES

CO

ST

(E

UR

O)


TRIBAN Workshop

CNET

A comparison study: P to P / P to MP

OLTONU

ONU

Point to Multipoint

Point to Multipoint

OLT

Splitter in the exchange

ONU

ONUOLT

Point to PointONU

ONUOLT

Splitter in the outside plant

NOC’98 (Manchester, UK)


TRIBAN Workshop

CNET

Functional comparison

Optoelectronic systems

Fibre infrastructure

Installation techniques

Initial cost estimated case 3 cheaper

O&M

Service Provision

Network Upgrading

Cost evaluation difficult strategic functionalities

Case 2 P to MPSplitter in LEX

Case 3 P to MPSplitter outside

0.00

20.00

40.00

60.00

80.00

100.00

120.00

Case 1 P to P

Eva

luat

ion

fac

tor

(arb

itr.

un

its)


TRIBAN Workshop

CNET

Hardware monitoring based on OTDR

OLT

ONU

OTDR

Control

WDM

OS

s

m

OS : Optical selector

Filter to stop m

To other PONs

Rm F

F

s

m

Rm Reference reflection

m ( 1600-1650 nm window )

Local exchange Outside plant


TRIBAN Workshop

CNET

WDM opportunities in access

WDM is booming in trunk networks.

What’s about in access?

• Where WDM could be used in the access network?

• What are the drivers for WDM?

• How WDM could be implemented in the access network?

• Is WDM technology ready for access application ? (WDM lite)

• What economical advantages could be foreseen using WDM?

• What could be suggested to Network Operators today?


TRIBAN Workshop

CNET

WDM in access : where? why? when?

subscribers

< 5

0 k

m<

10

km

< 1

km

LEX LEX

FTTB/F/O HFCFTTCabFTTB/H Radio HFR

CC

100.000

10.000

200

CustomerPremises

LAN

level 1

level2

level 3

level 4

Capacity upgradeShort term

Dedicated Short/mid term

Capacity upgradeService separation Long term


TRIBAN Workshop

CNET

ADSL : hardware analysis

• Modems are mainly based on silicon technology– Basic functions :

• analogue/digital converter, DSP, interfaces

==> 3 to 5 chips, ~3 million transistors, CMOS 0.5- 0.35µm, < 100$

• splitter, protection (passive components)

Today

value


TRIBAN Workshop

CNET

ADSL : hardware analysis

• Copper network ability to support ADSL depends on historical practices – most European networks length fits quite well – uncertainties rely on :

• cable gauge, insulation, design, bridged taps• installation in duct, buried, aerial

Testing quality & performance is becoming a critical issue

• Indoor cabling – first trials lesson is : ‘‘to be drastically simplified’’...– ‘low disturbance’ solutions recommended


TRIBAN Workshop

CNET

Power Lines communications

Outdoor Indoor

Transmission of data on low voltage electricity distribution network

Foreseen domains of applications :

TRANSFORMERMV/LV

POWER LINE CABLES

ADAPTORS

TOWARD

CORE NETWORK

METERCOAX or FIBRE

COAX

BASESTATION


TRIBAN Workshop

CNET

PLC: first view, open questions

• Outdoor : could be an alternative but...

– technical feasibility announced, but not clearly demonstrated– limited bandwidth : ~1Mbit/s shared with (200-250) customers

connected to the same MV/LV transformer – many noise sources: household appliances, radio-amateur– variable cable impedance– EMC, standardisation & cost issues to be addressed – field trials need co-operation with electricity suppliers

A Wooden Horse among Telcos?

• Indoor : products are available for low data rate applications


TRIBAN Workshop

CNET

Conclusions

Which broadband technologies for access ?

• ADSL : ready now for large scale deployment

• Fibre based solutions for :– customers whose demand can’t be satisfied with ADSL

• business : FTTB/F/O • SOHO & residential : FTTCab/H - HFC, HFR

– green field areas, infrastructure renewal

• PLC : immature with today knowledge

Documents

TRIBAN Workshop CNET BERN 17-19 November 1998 1 From the device to the outside plant installation practice Daniel Lecrosnier France Telecom /CNET CH :