A coded supervisory signal must consist of not less than how many rounds of the transmitted number for fault indication?

A coded supervisory signal must consist of not less than how many rounds of the transmitted number for fault indication?

• A. 2 rounds
• B. 3 rounds
• C. 4 rounds
• D. 1 round

Answer: (A)

Coded supervisory signaling relies on repeating a specific transmitted number to clearly indicate a fault condition and to guard against misreading transient noise. Requiring not less than two rounds means the same code is sent twice in succession, giving the receiving control panel a reliable pattern to recognize as a supervisory fault rather than a momentary glitch. If only one round were used, a single faulty read or line noise could falsely appear as a fault or be missed altogether. Two rounds provide a simple, dependable redundancy that the panel can confirm as fault indication, while still keeping signaling efficient.

Coded supervisory signaling relies on repeating a specific transmitted number to clearly indicate a fault condition and to guard against misreading transient noise. Requiring not less than two rounds means the same code is sent twice in succession, giving the receiving control panel a reliable pattern to recognize as a supervisory fault rather than a momentary glitch. If only one round were used, a single faulty read or line noise could falsely appear as a fault or be missed altogether. Two rounds provide a simple, dependable redundancy that the panel can confirm as fault indication, while still keeping signaling efficient.