What is Synchronous Time Division Multiplexing? What are the features of it?

The features of synchronous Time division multiplexing (STDM):

(i) Data rate of medium exceeds data rate of digital signal to be transmitted.

(ii) Multiple digital signals interleaved in time.

(iii) May be at bit level of blocks.

(iv) Time slots pre-assigned to sources and fixed.

(v) Time slots allocated even if no data.

(vi) Time slots do not have to be evenly distributed amongst sources.

(vii) Synchronous time division multiplexing can be used for both analog and digital signals.

(viii) In synchronous TDM, the connection of input is connected to a frame.

(ix) In synchronous TDM, the multiplexer allocates the same slot to each device at all times.

Synchronous time division multiplexing:

In synchronous TDM, each device is given same time slot to transmit the data over the link, irrespective of the fact that the device has any data to transmit or not. Hence the name synchronous TDM, Synchronous TDM requires that the total speed of various input lines should not exceed the capacity of path, synchronous time division multiplexing can be used for both analog and digital signals.