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Computer Science · Oct / Nov 2023 · Paper 11 · Question 4

0478

As printed in the paper

The question as text

Data is transmitted between a computer and a printer.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 4(a)[2]

    One mark for each correct transmission method:

    Serial half-duplex
    Serial full-duplex

  • 4(b)[4]

    Any four from:

    The number of 1 s/0 s are counted
    A parity bit is added to each byte/7 bits before transmission
    … to make the sum of the bits/1 or 0 s in each byte odd
    After transmission, if the number is odd no error is detected
    After transmission, if the number is even an error is detected

  • 4(c)[1]

    Echo (check)
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