Test 6. Rekayasa Jaringan Akses

Soal:

Wireless Network Access

There is a mobile transceiver which have capacity = 56 Mbps internet channel.

Calculate:

1. Maximum Revenue per day if operated for Voip use 10 Kbps voice codec, with GOS at busy hours = 2% ; total trafic perday (24 Hours) = 16 times the traffic at busy hour. Average tariff per minute = 1000 rupiah.

jawab:

Voip menggunakan 10 Kbps Voice Codec, sedangkan mobile transceiver memiliki kapasitas 56 Mbps.

Sehingga dapat dihitung jumlah kanal = 56Mbps / 10 Kbps = 5600 kanal

Kemudian dicari Intensitas trafik (Erlang), dikarenakan jumlah kanal yang besar maka menggunakan kalkulator erlang, tersedia Online di situs http://www.site2241.net/erlang.htm

memasukkan parameter kanal = 5600 dan GOS 2%

Gambar

akan keluar hasil:

Desired Grade of Service (GOS) = 0.02
Number of Available Channels (C) = 5600
Offered Load for Erlang-B Blocking Probability = 5674.394157421462 Erlang

1 Erlang = 60 menit

Total trafic perday (24 hour) = 16 x 5674.394157421462 x 60 menit = 5447418,391

Maximum revenue per day = Total Trafic perday x Rp. 1000,-

= 5447418,391 x 1000,- =  Rp. 5.447.418.391,- / hari

2. Using the concept of OEC (Operational Effective Capacity). Calculate the maximum revenue per day if operated for internet service only. Volume based tarrif 5 rupiahs per kbyte and OEC = 25% !

Jawab.

Traffic Internet = 

56 Mbps x 25% = 14 Mbps

Traffic perday = 14 Mbit/s x 3600 sec x 24 hour = 1209600 Mbit / 8 = 151200 MB

Total Revenue = 151200MB x Rp. 5/KB = Rp. 756.000.000 / hari

 

3. Using OSF Concept, (Over Subscription Factor)

a) Calculate the maximum number of subscriber, if OSF = 12 (the average number of customers on line and active = 12 % ) and minimum rate = 64 Kbps.

Jawab.

56 Mbps/128 Kbps = 437,5 bps x12 = 5250 subscriber

b. Calculate unlimited tariff per customer per day if customer = maximum number of customer, and revenue = answer question number 2

jawab

Total Revenue per hari =  Rp. 756.000.000 / hari / 5250 customer = Rp. 144000,-

 

–koreksi klo salah yuaa–

 

 

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