April
1999 QUESTION 3 Total Marks: 20 Marks |
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| (a) | What is multiplexing? Does multiplexing
typically apply to point-to-point or to broadcast communication? Explain your answer.
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[4] |
| (b) | Explain the operation of synchronous
Time-Division Multiplexing (TDM).
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[4] |
| (c) | Statistical TDM usually performs better than
synchronous TDM. Explain why this is so, and under what circumstances it will not
be the case.
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[5] |
| (d) | Polling is sometimes used in broadcast type of network. Why is it inappropriate for general-purpose computer communications? Explain the difference between the balanced and unbalanced approaches to polling. | [7] |