Final Review

Final Review - EE132B Professor I.Rubin...

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EE132B Professor I. Rubin UCLA ELECTRICAL ENGINEERING DEPARTMENT EE132B - DATA COMMUNICATIONS AND TELECOMMUNICATIONS NETWORKS Final Examination Do all problems Professor Izhak Rubin Winter 2009 Problem 3 (Design Problem 1) (20 points) a. Consider the following operation across the output buffer of a network router that serves to queue messages transmitted across a designated outgoing line to another node in a network. Assume that 20% of the messages arriving to the router are switched to each one of the outgoing buffers. Assume messages arriving to an output buffer to follow a Poisson message arrival point process. The time it takes to transmit a message across an outgoing line is assumed to be random and to follow an exponential distribution. On average, each message contains a total of 6000 bits. The outgoing messages are transmitted across the output channel at a rate of 256 Kbps. Messages arriving to the system are flow controlled. Compute the maximum rate of messages arriving to the input of the router that should be permitted, under the requirement that the average delay (in waiting and in transmission) incurred by a message residing in the output buffer is no higher than 30 msec. b.
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Final Review - EE132B Professor I.Rubin...

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