techno-economic comparison of gpons and long-reach pons farsheed farjady dr marco ruffini, professor...

Techno-Economic Comparison of GPONs and Long-reach PONs

Farsheed Farjady

Dr Marco Ruffini, Professor David Payne, Professor Nick Doran

Overview

1.0 Intro to LR-PON and GPON2.0 Advantages of LR-PON3.0 Results4.0 Summary

ONU

ONU

ONU

Local Exchange

20 km max

2.5 Gbit/s downstream (1495 nm)

1.25 Gbit/s upstream

(1310 nm)

GPON Architecture with 21CN backhaul

GPON

OLT

Backhaulto metro nodes

32-64 Customers

Flat Core Network Metro

Node

LONG-REACH PONs (LR-PONs)

100 km

LOCAL EXCHANGE(by passed)

OPTICAL AMPLIFIERS

512 to1024 total split

10.0 Gbit/s downstream

10.0 Gbit/s upstream

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 ModelFibre 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= 24645e.g. Swansea Main, Wales

Exchange Population= 5164e.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 architecturesCurrent 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