P1 commuicating with light (3)

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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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