August
1997 QUESTION 2 Total Marks: 20 Marks |
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| 2. | (a) A number of different transmission media can be used to implement a network. | [2] | |
| (i) A twisted pair of wires is the simplest form. What data rate can typically be achieved over such a connection when it is used in a LAN? | [2] | ||
| (ii) Alternative cable connections are co-axial cable and fibre optic. Write down one advantage and one disadvantage which twisted pair wire has over these other media | [6] | ||
| (iii) List two wireless transmission media, giving a data rate for each. Which of these would be ideal for providing data communications between two offices of a company within one city? What condition must apply for this choice of medium to be suitable? Explain your answers. | [3] | ||
| (b) | (i) Explain the difference between digital and analog signals, giving examples of how each arises. | [3] | |
| (ii) What is a modem? | [2] | ||
| (iii) Describe, with the aid of diagrams, two methods of analog modulation. | [5] | ||