What component is responsible for combining data signals into one channel for transmission?

The component responsible for combining data signals into one channel for transmission is a multiplexer. A multiplexer functions by taking multiple input signals and consolidating them into a single output signal. This process allows efficient use of bandwidth and makes it easier to transmit data over communication lines. By enabling several signals to share the same medium, multiplexers improve the overall efficiency of communication systems.

In contrast, a demultiplexer serves the opposite function of a multiplexer: it takes a single input signal and separates it into multiple output signals. A repeater is used to extend the range of transmission by amplifying signals but does not combine signals. An intermediate signal processor typically modifies or processes signals rather than combining them for transmission. Thus, the multiplexer is the correct choice for the function of combining data signals into one channel.