TDM	FDM
1] Time division multiplexing.	1] Frequency division multiplexing.
2] The signals which are to be multiplexed can occupy the entire band width but they are isolated in the time domain.	2] The signals which are to be multiplexed are added in the time domain but they occupy different slots in the frequency domain.
3] TdM is preferred for the digital signals.	3] FDM is usually preferred for analog signals.
4] Synchronization is required.	4] Synchronization is not required.
5] TDM circuitry is not very complex.	5] The FDM requires a complex circuitry at the transmitter and receiver.
6] Due to only a few TDM channels will be affected.	6] Due to wide hand fading in the transmission medium all the FDM channels are affected.