EST 4 | How to test Phone Lines

Описание: This video will show how to test the phone lines for a EST 4 fire alarm panel

NFPA 72 - 2025 Edition
Table 14.4.3.2, Component 4(2): Digital Alarm Communication Transmitter (DACT) – Annual Testing
(1) Disconnect the telephone line (primary line for DACTs using two telephone lines) from the DACT. Verify indication of the DACT trouble signal occurs at the premises fire alarm control unit (FACU) within 4 minutes of detection of the fault. Verify receipt of the telephone line trouble signal at the supervising station. Restore the telephone line (primary line for DACTs using two telephone lines), reset the FACU, and verify that the telephone line fault trouble signal returns to normal. Verify that the supervising station receives the restoral signal from the DACT.
(2) Disconnect the secondary means of transmission from the DACT. Verify indication of the DACT trouble signal occurs at the premises fire alarm control unit (FACU) within 4 minutes of detection of the fault. Verify receipt of the secondary means trouble signal at the supervising station. Restore the secondary means of transmission, reset the FACU, and verify that the trouble signal returns to normal. Verify that the supervising station receives the restoral signal from the secondary transmitter.