describe asynchronous transmission with the aid of a sketch

(a) Compare optical fibre and microwave link in terms of
• Transmission speed
• Security of data
• Bandwidth
• Electromagnetic interference (4 Marks)
(b) Distinguish between DCE and DTE as applied in data communication with the aid of a diagram (4 Marks)
(c) Determine the channel capacity given a frequency range of 100 Hzs to 3400 Hertzs, if a 16 level MODEM is used (5 Marks)
(d) (i) describe asynchronous transmission with the aid of a sketch
(ii) Outline TWO advantages of asynchronous transmission
(iii) Outline TWO disadvantages of asynchronous transmission (7Mark




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