We can divide the multiplex in different categorize, for example:
FREQUENCY DIVISION MULTIPLEXERS (FDM)
TIME DIVISION MULTIPLEXERS (TDM)
STATISTICAL TIME DIVISION MULTIPLEXERS (STDM).
But in this case, we're going to explain about the time and frequency, because the time division multiplex differ to frequency, because the circuit is divided horizontally, and the time is vertically
b. splits the communication circuit vertically (with time slots) instead of horizontally
