A multiplexer divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.
<u>Explanation:
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The operation carried out using a single high-speed communication circuit costs way more than the operation carried out using multiple lower speed circuits.
The multiplexer enables the breaking of the circuit efficiently in order to split the signals to travel through multiple lower speed circuits.
Though the use of a multiplexer reduces the efficiency of the operation, it also helps in cutting the operation costs substantially.
