A digital multiplexer is a device for converting lower-order group input signals, which are asynchronous digital signals, on a plurality of channels to a higher-order group signal by time-division multiplexing. Digital multiplex systems are also known as subscriber loop multiplexers, remote subscriber multiplex terminals or remote line switches. These systems provide carrier communication service between a central office and a group of subscribers associated with one or more remote terminals, the central office being coupled to the terminals over a multiple channel line. Digital multiplexers are very common within integrated circuits such as microprocessors and digital signal processors. Essentially, a multiplexer is a circuit that outputs one of several received data signals in response to received selection signals. Digital multiplexers used in time division multiplexing systems typically include a logic circuit with components such as gates and flip-flops. A high speed digital multiplexer accepts digital data from the lines of a plurality of buses. Each line in each bus provides digital data of an individual binary significance.
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