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Computer Science · Oct / Nov 2021 · Paper 12 · Question 3

0478

As printed in the paper

Show the answer and mark scheme

  • 3(a)[6]

    One mark per each correct row.

    Parallel

    Parallel

    Serial

    Serial

    Statement

    simplex

    half-duplex

    duplex

    simplex (✓)

    (✓)

    (✓)

    (✓)

    bits are transmitted along a single wire

    data is transmitted in both directions
    it is only suitable for distances less than 5
    metres

    Bits from the same byte are transmitted one

    after the other

    data may not arrive in the correct sequence

    data is transmitted in both directions, but
    only one direction at a time

  • 3(b)[3]

    Any three from:

    Can charge/power the mobile device (at the same time)
    (Uses serial transmission so) data less likely to be skewed / corrupted
    Universal / industry standard / connection
    Cable can only be plugged in one way // Cannot be inserted incorrectly
    Fast transmission speed
    Backward compatible
    Supports different transmission speeds
    Automatically detects device // Automatically downloads drivers
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