1. Calculate the sender utilization of a satellite link that connects two device

Question

1. Calculate the sender utilization of a satellite link that connects two devices at 100 Mbps, in which the length of the link is 500 km and the frame size is 1Kilobytes. Assume Stop-andwait protocol for the reliable data transfer protocol (i.e. rdt 3.0). You may ignore the transmission time for the ACK frame in Stop-and-wait. Assume that the speed of light in the medium is 2x108 m/sec.

2. In question (1), what should the window size be to achieve maximum sender utilization?

I just need someone to check my answer. I do not think the window size is correct.

Thank you for your help.

Explanation / Answer

The window size is the maximum number of bytes of data that can be transmitted in one segment without acknowledgement.
for a 100 Mbps link with RTT of .005 , windows size of at least

We can calculate the potential amount of data in transit in one direction at one point in time as bandwidth * delay:

100Mbps * 0.005 = 100 * 106 / 8 * 0.005 (divided by 8 bits per byte )
                            = 0.0625 * 106
                            = 62500 bytes

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