Info

108 kHz

Modulator

Modulator

Modulator

Demod

Demod

Demod

Filter 60-64 kHz

Filter 60-68 kHz

Filter 104-108 kHz

Medium

64 kHz

68 kHz

108 kHz

Filter 60-64 kHz

Filter 60-68 kHz

Filter 104-108 kHz

Carrier frequency generator

Recovery of signals

Single channel

Fig. 3.22. Principle of operation of FDM. 3.6.3. Time Division Multiplexing (TDM)

In 1970's TDM was introduced and now favored over FDM. TDM is the sharing of a common transmission medium in time. In TDM, the time available is divided into small slots, and each of them occupied by a piece of one of the signals to be sent. Thus the multiplexing device should scan the input signal in round-robin fashion. TDM is a base band technology in which individual channels of data or voice are interleaved into a stream of framed bits across a communication channel. Fig. 3.23 shows the Principle of TDM.

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