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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
© British Telecommunications plc
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