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Efficiency, Throughput Calculations - Theoretical

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Hi everyone:

I have a class assignment concerning computing throughput, efficiency, propagation delay, etc. I scoured all the material made available to the class and did research online, to little avail. All the formulae I found do not take one or another of the variables given into account. Can anyone help? I'm not really interested in the answer; I want to understand -- in clear and simple terms -- how this works and how to do it.

These are the tasks:

1. We send data in 1 MB packets using the GBN protocol (window size = 4) from Armidale to Sydney (terrestrial line: 500 km). What are the conditions on the transmission speed for the efficiency to be 90%?
2. We send data packets using the GBN protocol (window size = 128) using a satellite link (transmission speed: 0.1 Mbps, total propagation delay: 280 msec). What are the conditions on the packet size for the efficiency to be 100%?

Thanks so much,

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