December
1998 QUESTION 4 Total Marks: 20 Marks |
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| (a) | Data transmission may be serial or parallel,
and simplex, half-duplex, or full-duplex. Explain three of these terms,
and illustrate each with an example.
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[6] |
| (b) | What is a multiplexer? Explain the main
purpose of using it during the transmission of data.
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[3] |
| (c) | Explain the following terms: | [6] |
| (i) Frequency-division Multiplexing (FDM); | ||
| (ii) Statistical time-division Multiplexing
(STDM).
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| (d) | For each of the following, suggest a suitable multiplexing technique, giving reasons for the answer. | [5] |
| (i) to enable several telephone connectilons to share one trunk route; | ||
| (ii) to enable several interactive terminals to be connected to a remote mainframe. |