The process of combining
multiple messages simultaneously on the
same physical or logical transmission medium. There are two main types: time
division multiplexing (TDM) and frequency division multiplexing (FDM). In TDM a
device is allocated specific time slots in which to use the transmission medium.
FDM divides the transmission medium into channels of smaller bandwidth to which
the user has exclusive rights. FDM and TDM can be combined to provide devices
with time slots of logical channels.