Transcript EPSRC_200911.ppt

Techno-Economic Comparison of
GPONs and Long-reach PONs
Farsheed Farjady
Dr Marco Ruffini, Professor David Payne, Professor Nick Doran
Overview
1.0
2.0
3.0
4.0
Intro to LR-PON and GPON
Advantages of LR-PON
Results
Summary
GPON Architecture with 21CN backhaul
32-64
Customers
Local
Exchange
Backhaul
to metro nodes
2.5 Gbit/s
downstream
(1495 nm)
ONU
GPON
ONU
OLT
1.25 Gbit/s
upstream
(1310 nm)
20 km max
ONU
LONG-REACH PONs (LR-PONs)
10.0 Gbit/s downstream
Flat Core
Network
10.0 Gbit/s upstream
Metro
Node
LOCAL EXCHANGE
(by passed)
100 km
OPTICAL
AMPLIFIERS
512 to1024
total split
Advantages of LR-PON
• Large split 512 to 1024 instead of 32 to 64
• Greater statistical multiplexing advantage.
• Reduction in Electronic nodes and sub-systems
–
Lower cost, lower power consumption - greener network
• Optical networks more reliable than copper.
–
Lower operating costs
• 10Gb/s peak rate to customers (~10,000 times DSL rates).
–
10 to 20 Mb/s sustained bandwidth (~200 times DSL rates).
• Future bandwidth can be ~ 100 times greater via WDM
• 5600 Local Exchanges in UK can be reduced to ~100!
Techno-Economic Software Model
Fibre cost data to create cash flows curves from Analysys Mason for BSG, 2008: “The costs of
deploying fibre-based next-generation broadband Infrastructure”.
Techno-Economic Software Model
Cost breakdown
Exchange Population
LR-PON Cost Savings
Reducing Take-up rate to 40%
LR-PON Cost Saving
Max bandwidth 1 Mb/s
LR-PON Cost saving
Max bandwidth 100 Mb/s
LR-PON Cost Saving
Effect of Take-up rate
Effect of variable take-up rate
population sizes
100 Mb/s maximum bandwidth
Effect of variable take-up rate and
Cash Flow Curves
Time to Positive Cash flow vs.
Take-up rate
Effect of Initial revenue
High and Low Exchange Population
Exchange Population= 24645
e.g. Swansea Main, Wales
Exchange Population= 5164
e.g. Glantawe, Wales
Comparison of Total Costs vs.
Exchange Population
LR-PON Cost Advantage
Comparison of Total cost vs.
Take-up Rate
LR-PON Cost Advantage
Summary I
• The model is a flexible analysis tool for
comparing alternative architectures
Current version includes:
– LR-PON plus flat optical core
– Standard GPON with 21cn type backhaul
• The model predicts lower cost for LRPON as well
as faster time to positive cash flow.
• These advantages will be greater when power
consumption models are added later in the
project.
Summary II
•
The model can produce:
–
–
–
–
•
Cash flow analysis
Component and sub-system costs.
Inventory analysis
Cost by region/geography, geotype or
exchange area etc.
It is developed as a strategic analysis tool but could be
developed for business case support in the future, if
required.
Acknowledgment
We wish to thank Welsh Assembly
Government for funding this
project.
Thank you