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Gate2017 cs Q58

0. The values of parameters for the Stop-and – Wait ARQ protocol are as given below:
Bit rate of the transmission channel = 1 Mbps
Propagation delay from sender to receiver = 0.75 ms
Time to process a frame = 0.25 ms
Number of bytes in the information frame = 1980
Number of bytes in the acknowledge frame = 20
Number of overhead bytes in the information frame = 20
Assume that there are no transmission errors. Then the transmission efficiency (expressed in percentage) of the Stop-and – Wait ARQ protocol for the above parameters is _____.

  • Option : A
  • Explanation :
    Given Data:
    B = 1Mbps
    Tproc = 0.25ms
    Tp = 0.75ms
    L = 1980 Bytes
    LOH = 20 Bytes
    LA = 20 Bytes
    Efficiency (η) = ?
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