August
1997 QUESTION 4 Total Marks: 20 Marks |
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| 4. | (a) What is the difference between baud rate and bits per second? Under what circumstances will they both be the same? | [4] |
| (b) Explain the concept of modulation, including the different modulation techniques available for digital signals. You should describe (if applicable) how each can be used to achieve a variation between baud rate and bits per second. | [5] | |
| (c) What factors limit the transmission rates possible over twisted pair cables? | [4] | |
| (d) What is pass band? As a result of the factors in part (c) (and others), what is the available pass band for a normal telephone line? Assuming that in ideal conditions, two samples are possible per cycle, what is the theoretical maximum baud rate for a telephone line? | [4] | |
| (e) The V.32 modem standard actually uses 2400 baud transmission, and achieves 9600 bits per second. How many distinct modulation patterns per baud must V.32 modems generate? Explain your answer. | [3] |