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Which multiplexing technique transmits digital signals?

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Which multiplexing technique transmits digital signals?

(a) FDM

(b) TDM

(c) WDM

(d) Both FDM and TDM

I got this question in quiz.

I'm obligated to ask this question of FDM System in chapter Amplitude Modulation of Analog Communications

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Correct choice is (b) TDM

The best explanation: Time Division Multiplexing is used to transmit digital signals. FDM and WDM techniques are used to transfer analog signals. WDM (Wave Division Multiplexing) is partly similar to FDM (Frequency Division Multiplexing). FDM is used for signal transmission through a twisted-pair cable while WDM is used to transmit signals through optical fiber cables.

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