A telephone modem is used to connect a personal computer to a host computer. The speed of the modem is 56 kbps, the one-way propagation delay is 100 ms, the packet size is 256 bytes, and the...

A telephone modem is used to connect a personal computer to a host computer. The speed of the modem is 56 kbps, the one-way propagation delay is 100 ms, the packet size is 256 bytes, and the probability of an error in a packet is 10^-4.

Find the efficiency of stop-and-wait ARQ.

What window size N is needed to keep the channel busy when there are no transmission errors. For this window size finds the efficiency of the go-back-N and selective repeat protocols.

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