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Project
• Subject:
– Planning, Designing and dimensioning of PSTN &
NGN networks with DSL simulation for the country
described below. The country consists of 6 big
cities and 26 small cities and villages (Map in next
slide).

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• Inhabitants
• Big cities




A
B
C

220000
80000
140000

Project
D
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100000
75000
60000

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6000
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7000
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2000

• Small cities















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5000
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9000
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9000
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Network Assumptions















Originating traffic for residential subscribers: 300 kBHCC
Terminating traffic for residential subscribers is 60% of originating one.
Originating traffic for Business subscribers: 200 kBHCC
Terminating traffic for Business subscribers is 60% of originating one.
Portion of internal calls Pint= 15%
Mean holding time (residential)=90seconds
Mean holding time (business)=120seconds
Big cities Subscribers are considered to be 70% residential and 30%
business, while small cities and villages subscribers are 90% residential
and 10% business.(the total number of companies is about 2500).
20% of residential subscribers and 40% of business subscribers (in big
cities) are internet subscribers as well. (1 Mbps and 4 Mbps respectively)
Central processor (CP)-Execution time:
Internal
6.9ms
Outgoing
12.5ms
Incoming
10ms

Network Assumptions











Maximum CP load: 85%
Congestion:1%
Capacity of Transit Exchange: 10000 Erlangs
Maximum capacity of RSU: 2048 Lines
50% of traffic is interzone traffic.
Links between LE and RSU: 3E1/1000lines
Softswitches capacity:850000 subscribers
MGW capacity: 30000 subscribers
MSAN capacity: 100 slots: (144 ports per card (POTS & xDSL))
Codec: G.711 (PCM)

Project Phases
1. Teletraffic study and dimensioning of the desired
network (loss System).
(15 pts)
2. Design of Switching system:
(15 pts)
Architecture, exchanges, type, capacity,…
3. Design of Transmission system:
(15 pts)
Architecture, nodes, type, capacity,…
4. Financial study of the network knowing that:(25pts)
• Equipments prices:
– Transit Exchange: 400 MU/Erlang
– Local Exchange: 20 MU/ligne (RSU included)
– SDH STM-4: 120000 MU/unit
– SDH STM-1: 40000 MU/unit
– PDH: 100 MU/E1

Project Phases
4. Financial study of the network knowing that:(25pts)





+40% of transmission price for FO and MW.
+40% of total price for local loop.
+10% for O&M per year.
Mean holding time per subscriber per day:
– 15 minutes (residential)
– 25 minutes (business)

• +10% of total revenues added as income from international
calls.

Project Phases
4. Financial study of the network knowing that:(25pts)
• Three years network dumping.
• 60% of lines are installed during the first year, 30% during the
second year and 10% during the third year.
You have to find out firstly the total network cost and define
then the appropriate tariffs (installation fees, monthly
subscription and call tariff) to cover the network cost within
three years.

Project Phases
5. Propose a solution to migrate the PSTN network to
NGN network (Architecture, Migration procedure,
Softswitches, MGW and MSAN dimensioning,
required transmission capacity (estimation), cost
and financial study) (15 pts)
– Softswitch: 4 MU/Line
– MGW: 2 MU/Line
– MSAN:25 MU/Port

6. Simulate DSL bitrate versus local loop length in
noisy environment using MATLAB code simulator(15
pts)

Report
• Soft copies reports (on CD) should be
submitted by January 9, 2015.

• Reports shall include two students
per team.

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