What is the last processing step applied to signals before they are transmitted out of the headend?

What is the last processing step applied to signals before they are transmitted out of the headend?

• A. Multiplexed
• B. Encoded
• C. Filtered
• D. Demodulated

Answer: (A)

In a cable headend, you bring together multiple program streams into one signal for transmission. Encoding and filtering happen earlier in the process to prepare and condition each stream, but the step that finalizes what will be sent out is multiplexing—packing all the individual channels into a single transport stream so it can be carried over the network. Demodulation is done at the customer end to recover the original signals, not in the headend before transmission. After multiplexing, the transport stream is then prepared for transmission via modulation onto the network, but the last headend processing step before leaving is the combination of all streams into one multiplexed flow.

In a cable headend, you bring together multiple program streams into one signal for transmission. Encoding and filtering happen earlier in the process to prepare and condition each stream, but the step that finalizes what will be sent out is multiplexing—packing all the individual channels into a single transport stream so it can be carried over the network. Demodulation is done at the customer end to recover the original signals, not in the headend before transmission. After multiplexing, the transport stream is then prepared for transmission via modulation onto the network, but the last headend processing step before leaving is the combination of all streams into one multiplexed flow.