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Access network architecture
to be deployed at target area
24th June 2008
NTT Access Network Service System Laboratories
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Concept of Demand Forecast
Case StudySun City BuildingCiputra area
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Concept of Demand Forecast
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Why is design techniques necessary
Design method enable subscribers to be accommodate efficiently and economically in central office.
Low penetration of optical service High penetration of optical service
Efficient constructionof facilities
Underground cable
Facility managementunits
Fibers are distributed from underground cable to every area.
Central
office
facilities are complexmanagement is difficult
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Underground cable
Optical Demand Forecast
optical user
not need
current 10%
30%
current 30%
50%
Optical demand depends on each area. If you estimate the demand same in all area , it causeswaste or lack of facilities.Efficient construction of facilities are needed the optical demand management in every area.
current 10%
20%
a few years later
a few years latera few years later
potentialoptical-user
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River
Station
How to divide the unit
Railway
field
Rice field
Park
bridge
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River
StationRailway
How to divide the unit
field
Rice field
Park
bridge
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River
StationRailway
How to forecast the demand
field
Rice field
Park
Now
bridge
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River
StationRailway
Park
field
Rice field
How to forecast the demand
bridge
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River
StationRailway
field
Rice field
10 years later
Park
How to forecast the demand
bridge
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Use both single star and PON as the situation
demands
Topology
Access sectionCustomerpremises
Optical access networks
Centraloffice
Splitter ONU
OLT
Optical cable
ONUOptical cable
Splitter Optical cable
MC MCMC MC
OLT
ONU
ONU
ONU
ONU
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Users requiring Single Star circuit
Internet cafe Big company
Bank
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Example : Estimate the number of fibers
User target rate PON(4user/1SP) SS(depends on areaenvironment)
Unit 1 600business area
360 user 90 fiber 100 fiberuser 30% fiber
Unit 2 500business
/residential
300 user 75 fiber 60 fiberuser 20% fiber
Unit 3 400residential
240 user 60 fiber 30 fiberuser 10% fiber
about
about
about
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River
StationRailway
field
Rice field
Park
How to distribute the optical fiber
Required fibers
bridge
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IDMOLT
AURORA
OLT ONU
4 branch Splitter
Premise
8 branch Splitter
Configuration of optical access network topologyConfiguration of optical access network topology
DistributionPoint
Aerial optical accessline section
- About 0.7km -
Customerinstallations
section
Underground optical accessline section
- About 1.5 km -
FeederPoint
Configuration of optical access network topology
1 2cores
Mono coatedoptical fibers
24- 200 cores
optical
fiber cable1000 cores
8 cores
Drop Point
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River
StationRailway
How to distribute the optical fiber
field
Rice field
Park
Unit1 Unit2 Unit3 reserved
Feeder point
bridge
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River
StationRailway
field
Rice field
Park
How to distribute the optical fiber
bridge
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Example 1
we had designed with Low demand.10 years ago
Lay the minimum fibers.
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Example 1
residential houses increase!
What can I do?We need to lay additional cable!
Now
Shortage
we had designed with Low demand.10 years ago
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Example 2
we had designed with High demand.10 years ago
Lay a lot of fibers.
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Example 2
Customers dont want new services
What can I do?Sale the new service! (to market division)
Now
Many unused optical fibers remain!
we had designed with High demand.10 years ago
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Demand forecast
Demandforecast
Shortage
Too much
adequate
More Sales
Additional facilities
OK!
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Summary