A coded supervisory signal must consist of not less than how many rounds of the number transmitted for supervision and how many for restoration to normal?

A coded supervisory signal must consist of not less than how many rounds of the number transmitted for supervision and how many for restoration to normal?

• A. 3 and 2
• B. 2 and 2
• C. 2 and 1
• D. 1 and 2

Answer: (C)

The key idea is how coded supervisory signaling ensures a monitored device truly remains in a supervisory state and isn’t mistaken for a transient glitch. To make supervision reliable, the supervisory code is transmitted in repeated rounds so the receiving equipment can confirm the condition despite line noise or brief disturbances. The standard requires not less than two rounds of the supervisory number, providing sufficient redundancy to recognize a genuine supervisory signal. When the device returns to normal, the system uses a restoration-to-normal signal, and it only needs to be sent in a single round to clearly indicate the normal condition without prolonging the outage. So the minimum is two rounds for supervision and one round for restoration to normal. Fewer rounds for supervision could increase the risk of misinterpretation, while more rounds for restoration aren’t necessary once normality is established.

The key idea is how coded supervisory signaling ensures a monitored device truly remains in a supervisory state and isn’t mistaken for a transient glitch. To make supervision reliable, the supervisory code is transmitted in repeated rounds so the receiving equipment can confirm the condition despite line noise or brief disturbances. The standard requires not less than two rounds of the supervisory number, providing sufficient redundancy to recognize a genuine supervisory signal.

When the device returns to normal, the system uses a restoration-to-normal signal, and it only needs to be sent in a single round to clearly indicate the normal condition without prolonging the outage. So the minimum is two rounds for supervision and one round for restoration to normal.

Fewer rounds for supervision could increase the risk of misinterpretation, while more rounds for restoration aren’t necessary once normality is established.