Discussion
Consider the following statements about time division multiplexing.
1. Only one channel occupies the path at any instant
2. Crosstalk arises chiefly from limited channel bandwidth
3. It demands better amplifier linearity than frequency division
Which of the statements given above is or are correct?
Answer: B
The first two are correct and the third is the reverse of the truth: because the channels take turns rather than coexisting, non-linearity has nothing to mix and the linearity requirement is relaxed. It is frequency division that needs excellent linearity, because intermodulation there puts every channel into every other. The two schemes trade linearity against timing accuracy, and knowing which way round that trade runs is the practical consequence.
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