Time division multiplexer (TDM)
A time division multiplexer is an apparatus which combines (multiplexes) and separates (demultiplexes) high speed digital data being transferred between numerous data terminals and a digital transmission line. In a digital transmission system, time-division multiplexing (TDM) technology has been widely used for transmitting a plurality of digital signals. A typical time division multiplexer combines (serializes) a set of parallel signals into a single bit stream while the corresponding time division demultiplexer decombines (deserializes) the single bit stream back into the set of parallel signals. The time-division multiplexer multiplexes input digital signals, each having the same transmission rate. The time-division demultiplexer, on the other hand, demultiplexes the received multiplexed signal to restore the original digital signals. In time division multiplexing (TDM) each of two or more signals are allocated or associated with a set of recurring time periods or time slots. The time slots are configured such that the time slots associated with one signal do not overlap the time slots associated with another signal. A typical TDM transmitter samples pulse signals of relatively low pulse repetition frequency from various data sources or channels and interleaves them with one another to form an aggregate data stream that is transmitted by a high speed aggregate channel to a remote receiver.
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