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# S1 - Cmpen/EE 362 Asst 1 Solution Spring 2009 Problem 1...

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Cmpen/EE 362 Asst. 1 Solution Spring 2009 Problem 1. Text, Chapter1, problem 5. A factor in delay of store-and-forward packet switching is how long it takes to store-and-forward through a switch. Switching time is 10 microseconds. Is this likely to be a factor in response of a client-server system if New York to California? Solution. 2/3 the speed of light is approx. 200,000 km/sec. The distance from New York to California is about 4800 km, which is traversed in .024 seconds or 24000 microseconds. The problem soesn’t state how many switching points, but even if there were 100 store-and-forward switching points of 10 microseconds each, this factor would change the delay by only about 4%. Since there is not likely to be as many as 100 switching points, the 10 microsecond delay per switch would not be a major factor in end-to-end delay. Problem 2. Text, Chapter1, problem 6. A client-server system uses a satellite network, with the satellite at a height of 40,000 kilometers. What is the best-case delay in response to a request?

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S1 - Cmpen/EE 362 Asst 1 Solution Spring 2009 Problem 1...

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