Time-Division Multiplexing (TDM) signaling technology in which two or more signals can be transmitted over the same path by using different time slots or intervals for each signal; in telecommunications, this is done with digital signals so that packets from two or more lower-speed digital signals are interleaved into time slots on a higherspeed multiplexed signal; in TDM fiber optic systems, the digital signals are multiplexed electronically so that resulting aggregated or multiplexed high-bit-rate signal is transmitted over fiber as a single high-speed signal; after it is received and converted to an electronic signal, it is demultiplexed electronically into the two (or more) original signals.