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Transmission Delay

Consider sending N packets each of length L bits from Host A to Host B, as shown in the figure below. Assume that the links between Host A and the Router and between the Router and Host B each has a transmission rate of R bits per second. Assume all buffers are of infinite capacity. Ignore all processing and propagation delays.

Router Host A Host B

a) Express the delay it takes to send 2 packets from A to B as a function of L and R.

b) Express the delay it takes to send N packets from A to B as a function of L, N, and R.

c) Suppose the transmission rate from Router to Host B R/2 instead of R. Express the delay it takes to send N packets from A to B as a function of L, N, and R.

d) Suppose the transmission rate from Host A to Router is R/2 instead of R. Express the delay it takes to send N packets from A to B as a function of L, N, and R.

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