Fire alarm systems that communicate via telephone lines are required to monitor those lines for disconnection. If theprimary line fails, it must be reported as asupervisory condition, and the system will attempt communication via thesecondary line.
NFPA 72 (2022), Section 26.6.4.4.4.1:
"A single communications technology shall be monitored for integrity. Loss of the supervising line shall result in a supervisory signal..."
So, if theprimary phone line is disconnected, the correct system response is to issue asupervisory signal, not a general alarm or just a local alert.
Correct answer: D. Supervisory condition
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