sol1 - 0.0016 ii. Two telephone lines are enough because...

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EE3015 Tutorial 1 (Solution) Question 1 Circuit-switched network is more appropriate. Since data is transmitted in a steady rate, using circuit-switching method can simplify resource allocation. Since the application continues running for a relatively long period of time, it justifies the cost of setting up a circuit before sending actual data. Question 2 a) Four telephone lines are needed. b) i. n n n 4 8 . 0 2 . 0 4 N 0 1 2 3 4 Probability 0.4096 0.4096 0.1536 0.0256
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Unformatted text preview: 0.0016 ii. Two telephone lines are enough because the probability that more than two users want to use the telephone at the same time is 0.0256 + 0.0016 = 0.0272 < 0.3. c) Statistical multiplexing Question 3 a) 500 kbps (The first link is the bottleneck.) b) 4 MB / 500 kbps = 4 * 1024 * 1024 * 8 / (500 * 1000) = 67.1 sec. c) The throughput reduces to 100 kbps. Transmission delay = 4 MB/ 100 kbps = 4 * 1024 * 1024 * 8 / (100 * 1000) = 335.6 sec....
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