Downstream broadband RF signals traveling inside the coax cable start at what frequency in the United States?

Downstream broadband RF signals traveling inside the coax cable start at what frequency in the United States?

• A. 54 MHz
• B. 12 MHz
• C. 110 MHz
• D. 250 MHz

Answer: (A)

Downstream signals travel on the forward path of the coax spectrum, and in the United States that path starts at the 54 MHz mark. The lower end of the spectrum is reserved for upstream and other control signals, so the first usable downstream frequency is 54 MHz, with channels then stepping higher from there. So 54 MHz is the starting point for downstream in typical US cable systems.

Downstream signals travel on the forward path of the coax spectrum, and in the United States that path starts at the 54 MHz mark. The lower end of the spectrum is reserved for upstream and other control signals, so the first usable downstream frequency is 54 MHz, with channels then stepping higher from there. So 54 MHz is the starting point for downstream in typical US cable systems.