Frequency Division Multiplexing (FDM) is a technique that transmits multiple signals over a single communication channel by assigning each signal its own frequency band. In VoIP and telecom systems, FDM is used to allow multiple voice or data streams to share the same medium without interfering with one another. Each signal operates on a different frequency, ensuring that they remain distinct during transmission. While less common in modern VoIP systems (which often use Time Division Multiplexing or IP-based protocols), FDM is still relevant in certain analog communication environments and legacy systems. It plays a foundational role in enabling the simultaneous transmission of multiple conversations or data streams across a single physical medium.
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