Which term describes sending several signals simultaneously over a single channel using tone-frequency methods?

Which term describes sending several signals simultaneously over a single channel using tone-frequency methods?

• A. Tone-frequency multiplexing
• B. Polling
• C. Scanning
• D. Multiplexing

Answer: (A)

Sending several signals at once over one channel using distinct tones means each signal is carried on its own frequency and all tones travel together through the same medium. This approach is a specific type of multiplexing that relies on separating signals by frequency, so each signal can be separated and recovered at the receiving end by filtering or tone demodulation. Although multiplexing in general covers multiple schemes, the question points to the tone-based method, making tone-frequency multiplexing the best fit. Polling and scanning describe different data-collection or monitoring techniques and aren’t about transmitting multiple signals simultaneously on a single channel with tones.

Sending several signals at once over one channel using distinct tones means each signal is carried on its own frequency and all tones travel together through the same medium. This approach is a specific type of multiplexing that relies on separating signals by frequency, so each signal can be separated and recovered at the receiving end by filtering or tone demodulation. Although multiplexing in general covers multiple schemes, the question points to the tone-based method, making tone-frequency multiplexing the best fit. Polling and scanning describe different data-collection or monitoring techniques and aren’t about transmitting multiple signals simultaneously on a single channel with tones.