What process is used to combine multiple signals into a single transmission stream at the headend?

What process is used to combine multiple signals into a single transmission stream at the headend?

• A. Multiplexing
• B. Modulation
• C. Demodulation
• D. Filtering

Answer: (A)

Combining several signals into one transmission stream at the headend is multiplexing. This process bundles multiple channels or data streams so they can travel together over a single medium, making efficient use of the available bandwidth. In cable systems, multiplexing is implemented in forms like frequency-division multiplexing, where each signal occupies its own frequency band on the same cable, or time-division multiplexing, where signals share the channel by taking turns in time slots. Modulation shifts a signal onto a carrier for transmission, demodulation extracts the signal from a carrier, and filtering removes unwanted frequencies or shapes the spectrum; none of these combine multiple inputs into a single stream the way multiplexing does.

Combining several signals into one transmission stream at the headend is multiplexing. This process bundles multiple channels or data streams so they can travel together over a single medium, making efficient use of the available bandwidth. In cable systems, multiplexing is implemented in forms like frequency-division multiplexing, where each signal occupies its own frequency band on the same cable, or time-division multiplexing, where signals share the channel by taking turns in time slots. Modulation shifts a signal onto a carrier for transmission, demodulation extracts the signal from a carrier, and filtering removes unwanted frequencies or shapes the spectrum; none of these combine multiple inputs into a single stream the way multiplexing does.