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Time Division Multiplexing (TDM)

In Time-Division Multiplexing (TDM), multiple channels can be transmitted over a single transmission line by subdividing the data in small segments and sending these portions interleaved in time slots.

Two different types of TDM are used:
  • synchronous TDM: exactly the same time slot is allocated to each channel at all times, whether or not a channel has anything to transmit. In synchronous TDM, a frame consists of one complete cycle of time slots.
  • asynchronous TDM: time slots are allocated on demand. Medium capacity is shared on a packet-by-packet basis only among those channels that have data to be transmitted.
In this animation you can see the differences between these two TDM types. Just click on the stations to send data.