Difference b/w Frequency & Time Division Multiplexing

What is the difference between Frequency Division Multiplexing and Time Division Multiplexing.

The total bandwidth present in communication medium are divided. These are divided in series of non-overlapping (guard band provided) frequency called sub-bands. Where they are carrying separate signals. That is allow single transmission mediums such as radio spectrum, a cable or optical fiber to be shared by multiple separate signals.

1. FDM- Frequency division multiplexing where as TDM mean Time division Multiplexing.
2. In FDM spectrum is divided into frequency whereas in TDM divided into time slot.
3. FDM is used in 1st generation analog system whereas TDM is used in 2nd generation analog system.

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