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Unformatted text preview: B A The transmission speed of each link is 20 Mbps. The propagation delay on each link can be neglected. The routers are storeandforward devices. The four packets are sent one right after the other. a) (5%) What is the time required to send one packet from A to the first router? b) (15%) What is the total time required to send the file from A to B? 8. (20%) Suppose that there are a very large number of users sharing N communication lines. The probability that there are i active users at a particular time is given by the following formula: , ! 1 i e − i = 0, 1, 2, … a) (12%) Determine the smallest possible value for N if the probability of blocking some users is required to be less than 2%. Show your calculation. b) (8%) Using this example to explain the concept of statistical multiplexing. Is it an efficient way to allocate resources?  END ...
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This note was uploaded on 05/01/2011 for the course ELECTRICAL EE3015 taught by Professor Albertsun during the Spring '11 term at City University of Hong Kong.
 Spring '11
 AlbertSun

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