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A system uses the stop-and-wait arq protocolif each packet carries 1000 bits of data determine the time taken to send 1 million bits of data if the distnce between te sender and receiver is 5000 km?
Wilcross
The first answer is this:
"We require to send 1000 frames. We ignore the overhead due to the header and trailer.
Data frame Transmission time = 1000 bits / 1,000,000 bits ( 1 Mbps = 1,000,000 bps)
= 1 ms
The distance between the sender and receiver is 5000 km.
Data frame trip time = 5000 km / 200,000 km
= 25 ms
ACK transmission time = 0
ACK trip time = 5000 km / 200,000 km
= 25 ms
Delay for 1 frame = 1 + data frame trip time + ACK trip time
= 1 + 25 + 25
= 51 ms.
Total delay = 1000 51ms
= 1000bits 51 10-3
= 51s"
The second answer is this:
"The propagation delay is given by tp = d/c
Where d = distance between transmitter and receiver, c = speed of light, d = 5000 and c =3000000
So, tp = 5000/300,000 = 0.02
Transmission delay tt = L/λ
Where L = number of bits in the frame and λ = transmission rate in bits per sec.
Here L = 1000 and λ = 200000000
So, tt = 1000/200000000 = 0.000005
Total time taken T = tt + 2tp
T = 0.000005+0.02
T = 0.020005"
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∙ 11y ago
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