Which of the following pairs does not match?
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Modem - converts digital signals into analog and analog signals to digital
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Twisted pair cable - consists of two insulted copper wires
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Message switch - used to store and forward data to large number of terminals over a single communication channel
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Multiplexer - used to send only one signal over a multi communication channel
The multiplexer, shortened to “MUX” or “MPX”, is a combinational logic circuit designed to switch one of several input lines to a single common output line by the application of a control signal. Multiplexing (or muxing) is a way of sending multiple signals or streams of information over a communications link at the same time in the form of a single, complex signal; the receiver recovers the separate signals, a process called demultiplexing (or demuxing).