19 (ii)
Coded signals can also be sent using electrical pulses. Explain one advantage of using light signals rather than electrical pulses in modern cable communication systems. ........................................................................................................................................... ...................................................................................................................................... [1]
(d) Light signals can be transmitted using an optical fibre link. optical fibre link signal 1 signal 2
de-multiplexer
signal 3 signal 4
multiplexer Describe the job of the de-multiplexer. ................................................................................................................................................... .............................................................................................................................................. [1] [Total: 8]
Š OCR 2013
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