Coded alarm systems must repeat the code signal at least ____ times.

Coded alarm systems must repeat the code signal at least ____ times.

• A. 2
• B. 3
• C. 4
• D. 1

Answer: (B)

Redundancy in coded alarm signaling helps ensure reliable recognition. Repeating the code signal multiple times gives the receiver a clear chance to confirm the message isn’t just a bit of noise or a rare disturbance. If the code were sent only once, momentary interference could be mistaken for the code or a legitimate signal could be missed. A second transmission helps, but in noisy conditions it might still be ambiguous. A third identical transmission provides a solid confirmation that the same sequence was received, greatly reducing the chance of misinterpretation and ensuring the alarm is correctly activated. This is why the standard practice is to repeat the code signal at least three times.

Redundancy in coded alarm signaling helps ensure reliable recognition. Repeating the code signal multiple times gives the receiver a clear chance to confirm the message isn’t just a bit of noise or a rare disturbance. If the code were sent only once, momentary interference could be mistaken for the code or a legitimate signal could be missed. A second transmission helps, but in noisy conditions it might still be ambiguous. A third identical transmission provides a solid confirmation that the same sequence was received, greatly reducing the chance of misinterpretation and ensuring the alarm is correctly activated. This is why the standard practice is to repeat the code signal at least three times.