第二題
512 byte frame (4096 bits) takes 4096/64000 sec -- 64 msec
Roundtrip propagaton is 540 msec. This plus the time for one frame
to be read.(i.e. 64 msec) to give 540+64=604 msec
We need a window of 604/64 that is 10 frames to fully use the channel.
with window size 1, we can send 4096 bits/ 604 msec giving thruput of 6781 bps.
For window size 7, it is 47.47 kbps.
For window size 10 or more, the full 64kbps is used.
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