# A system uses the Go back N ARQ protocol with a window size of 7 If

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A system uses the Go-back-N ARQ protocol with a window
size of 7. If each packet carries 1000 bits of data, how long
does it take to send 1 million bits of data if the distance
between the sender and receiver is 5000 Km and the
propagation speed of the signal is 2x10^8 meters per
second? Ignore transmission, waiting, and processing
delays. Assume no errors in the link
Solution
Ans-
In the worst case, we send a full window of size 7 and then
wait for the acknowledgment of the whole window. We
need to send 1000/7 143 windows. We ignore the
Data frame trip time = 5000 km / 200,000 km = 25 ms
ACK transmission time = 0 (It is usually negligible)
ACK trip time = 5000 km / 200,000 km = 25 ms
Delay for 1 window = 25 + 25 = 50 ms.
Total delay = 143 × 50 ms = 7.150 s

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A system uses the Go-back-N ARQ protocol with a window size of 7. If each packet carries 1000 bits of data, how long does it take to send 1 million bits of data if the distance between the sender and receiver is 5000 Km and the propagation speed of the signal is 2x10^8 meters per second? Ignore transmission, waiting, and processing delays. Assume no errors in the link Solution AnsIn the worst case, we send a full window of size 7 and then wait for the acknowledgment of the whole window. We need to send 1000/7 143 windows. We ignore the overhead due to the header and trailer. Data frame trip ...
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