Next Generation Access

Ivan Boyd

BT Research and Venturing

© British Telecommunications plc

NGA - The Barriers

Barriers:

• High upfront capital investment

• Large civil infrastructure costs and effort

• Uncertain Operational Cost

• Uncertain take-up rates

• Uncertain revenues from new broadband services

• Regulatory Uncertainty

© British Telecommunications plc

BT Current Position on FTTP

• BT infrastructure operations in separate unit called Openreach

• Openreach will own infrastructure of future Optical Access/Metro Network

• Openreach provides equal access for all Communications Providers (CPs) - Equivalence of Input (EOI)

• FTTP viable in Greenfield sites with ~>20 premises– (actual number depends on detailed economics)

• GPON preferred FTTP solution

• No commitment at this point to mass market roll out of FTTP.

© British Telecommunications plc

Research to address the Challenges

Capital Cost

- New architecture to eliminate equipment

- Improved and more efficient deployment processes

- Maximise the lifetime of infrastructure (plan day 1 for evolution)

Operation Cost

- Simplify the network

- Consolidate nodes

© British Telecommunications plc

Research Network Vision

100km

1000-waysplit 10Gbit/s

10Gbit/s

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Steeping stones to the Vision 1. Extended Reach GPON (60km reach, 128-way split, 2.5/1.25Gbit/s)

ONU

ONU

ONU

ONU

4x32-waySplit

4X4

60km

128-way total split

Local Exchange

OLT S

OLT W

2. Asymmetrical Long Reach (100km reach, 512-way split, 10/2.5Gbit/s)

CORE NODE

CORE NODE

CORE NODE

METRO NODE

METRO NODE

ACCESS/BACKHAULCUSTOMER

LR-PON Services

Jack PCServer

VideoServer

HD CCTV

Xbox 360

HD CCTV

Media PC

Jack PCClientVideoClient

Demo 1:

Demo 3:

Demo 2:

Demo 3:

Demo 3:

100km

GPONClient OLTONT

ONT

ONT

ONT

hiD 6630

IP/MPLSPCisco CRS

Super Metro Node

Super Metro Node

Optical CoreDWDM

P

GMPLS control

hiD 6670

Core EthernetCore Ethernet

PBT/PBB-TEhiD 6670

Core Ethernet

OLTSwitch

PEPE

Aggregator

© British Telecommunications plc

Capex savings: Conventional FTTH vs Long reach PON

FSAN PON 1:1

Duct Build

Fibre Enclosures

Fibre Cable

Splitters

SDH Backhaul

Exchange

Electronics

50% Penetration, No Duct Build

PO

N –

b

ac

kh

au

l

Cos

t pe

r C

usto

mer

ONU's

Fibre Enclosures

Fibre Cable

Splitters

Backhaul

Exchange

Electronics

Urban

Rural

Lo

ng

Re

ac

h P

ON

PO

N –

b

ac

kh

au

l

Lo

ng

Re

ac

h P

ON

© British Telecommunications plc

7%

16%

23%34%

8%

3%

5%4%

E-side Duct

D-side infrastructure

On-site DiG duct

Drop

Fibre

Enclosures

Splitters

BF Tube

2%12%

31%

25%

11%

5%

8%6%

E-side Duct

D-side infrastructure

On-site DiG duct

Drop

Fibre

Enclosures

Splitters

BF Tube

Infrastructure Research – Deployment Cost savings

Cost reducedby ~1/3

• Single man blown fibre

• Overhead Blown fibre

• Duct congestion relief

© British Telecommunications plc

backhaul

Evolution to Future networks-extending the infrastructure lifeDay 1 Greenfield GPON deployment

Fibre lean cable back towards Exchange

Local Exchange

to metro node

Cable chamber

GPON-ONU

GPON-ONU

GPON-ONU

GPON-ONU

GPON-ONU

LR-ONU

LR-ONU

At day one install WDM couplers in local exchange

GPONGPONGPON

LR-ONU

GPON

GPON –ONUs with blocking filters

Optical NTE to simplify ONU upgrade

© British Telecommunications plc

backhaul

Upgrade to Long Reach PON

Fibre lean cable back towards Exchange

Local Exchange

to metro node

Cable chamber

GPON-ONU

GPON-ONU

GPON-ONU

GPON-ONU

GPON-ONU

LR-ONU

LR-ONU

GPONGPONGPON

LR-ONU

GPON

LR-ONU

GPON OLT removed from local exchange

LR-ONU

LR-ONU

© British Telecommunications plc

Capex savings: Long reach PON + Optical NTE deployed with infrastructure

FSAN PON 1:1

Duct Build

Fibre Enclosures

Fibre Cable

Splitters

SDH Backhaul

Exchange

Electronics

50% Penetration, No Duct Build

PO

N –

b

ac

kh

au

l

Cos

t pe

r C

usto

mer

ONU's

Fibre Enclosures

Fibre Cable

Splitters

Backhaul

Exchange

Electronics

Urban

Rural

PO

N –

b

ac

kh

au

l

ONU

Long Reach PON

Long Reach PON

Optical NTE

© British Telecommunications plc

Operational CostHigh Density Pop, Head End Consolidation

OpEx Drivers as Fraction of Opex Costs

$0

$10

$20

$30

$40

$50

$60

$70

$80

$90

Case 3 Case 4 Case 5

Annual Cost

per

Sub

CO Related

Fiber Related

Hardware Related

5km 20km 20km

1x4,1x8 1x4,1x8 1x4,1x32

OpEx

51% OpEx Savings

59% OpEx Savings

© British Telecommunications plc

Fiber-Related OpEx High Density Pop, Head End Consolidation

$0

$2

$4

$6

$8

Case 3 Case 4 Case 5

An

nu

al

Co

st

pe

r S

ub

Fiber Related OpEx

5km 20km 20km

1x4,1x8 1x4,1x8 1x4,1x32

8.8% Savings/Sub/yr

47% Savings/Sub/yr

Even greater savings to be expected with LR-PON

© British Telecommunications plc

CO-Related OpEx High Density Pop, Head End Consolidation

$0

$10

$20

$30

$40

$50

$60

$70

$80

Case 3 Case 4 Case 5

An

nu

al

Co

st

pe

r S

ub

CO Related

5km 20km 20km

1x4,1x8 1x4,1x8 1x4,1x32

75% Savings/Sub/yr 75% Savings/Sub/yr4 COs

1 CO1 CO

Greater CO consolidation with LR-PON . Therefore much greater savings anticipated.

© British Telecommunications plc

Conclusions

• There is no economic case for large scale FTTP roll out in the UK based on existing solutions

• Research team investigating a radical “Long Reach PON” solution that changes the economic structure of networks:– Longer reach access to eliminate metro networks– Higher capacity – 10GBit/s symmetrical– Greater split/sharing to improve economics– Network simplification and node consolidation to reduce opex– Optical NTE and Self-install ONU to reduce capital cost of the

infrastructure provider and simplify upgrades

• An intermediate step could be extended reach GPON

• There is an on-going need for infrastructure research that addresses more efficient fibre deployment