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Frames of 1000 bits are sent over a 1-Mbps channel using a geostationary satellite whose propagation time from the earth is 270 msec?
Wiki User
∙ 10y ago
Let t=0 denote the start of transmission. At t=1 msec, the first frame has been fully
transmitted. At t=271 msec, the first frame has fully arrived. At t=272 msec, the frame
acknowledging the first one has been fully sent. At t=542 msec, the acknowledementbearing frame has fully arrived. Thus, the cycle is 542 msec. A total of k frames are sent
in 542 msec, for an efficiency of k/542. Hence
a) k=1, efficiency=1/542=0,18%
b) k=7, efficiency=7/542=1,29%
c) k=4, efficiency=4/542=0,74%
Wiki User
∙ 10y ago
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Frames of 1000 bits are sent over a 1-Mbps channel using a geostationary satellite whose propagation time from the earth is 270 msec Acknowledgements are always piggybacked onto data frames The head?
Let t=0 denote the start of transmission.At t=1 msec,the first frame has been fullytransmitted.At t=271 msec,the first frame has fully arrived.At t=272 msec,the frameacknowledging the first one has been fully sent.At t=542 msec,the acknowledgement-bearingframe has fully arrived.Thus, the cycle is 542 msec.A total of k frames are sent in 542 msec,for anefficiency of k/542.Hence(a)k=1,efficiency=1/542=0.18%(b)k=7,efficiency=7/542=1.29%(c)k=4,efficiency=4/542=0.74%
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