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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 store-and-forward 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