1. Techno-Economic Comparison of GPONs and Long-reach PONs
Farsheed Farjady
Dr Marco Ruffini, Professor David Payne, Professor Nick Doran

2. Overview
1.0 Intro to LR-PON and GPON 2.0 Advantages of LR-PON 3.0 Results 4.0 Summary

3. GPON Architecture with 21CN backhaul
32-64 Customers
2.5 Gbit/s downstream (1495 nm)
Local Exchange
ONU
Backhaul
to metro nodes
GPON
OLT
ONU
1.25 Gbit/s upstream
(1310 nm)
ONU
20 km max

4. LONG-REACH PONs (LR-PONs)
10.0 Gbit/s downstream
512 to1024 total split
10.0 Gbit/s upstream
Flat Core Network
Metro Node
LOCAL EXCHANGE
(by passed)
100 km
OPTICAL AMPLIFIERS 4

5. 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!

6. 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”.

7. Techno-Economic Software Model

8. Cost breakdown

9. Exchange Population

10. LR-PON Cost Savings

11. Reducing Take-up rate to 40%

12. LR-PON Cost Saving

13. Max bandwidth 1 Mb/s

14. LR-PON Cost saving

15. Max bandwidth 100 Mb/s

16. LR-PON Cost Saving

17. Effect of Take-up rate

18. Effect of variable take-up rate population sizes

19. 100 Mb/s maximum bandwidth Effect of variable take-up rate and

20. Cash Flow Curves

21. Time to Positive Cash flow vs. Take-up rate

22. Effect of Initial revenue

23. High and Low Exchange Population
e.g. Swansea Main, Wales
Exchange Population= 5164
e.g. Glantawe, Wales

24. Comparison of Total Costs vs. Exchange Population

25. LR-PON Cost Advantage

26. Comparison of Total cost vs. Take-up Rate

27. LR-PON Cost Advantage

28. 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.

29. Summary II Cash flow analysis Component and sub-system costs.
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.

30. Acknowledgment
We wish to thank Welsh Assembly Government for funding this project.

31. Thank you