NFPA 72 – 2013 introduced changes from the previous code requirements for supervising phone lines.
Proper phone line supervision is accomplished with 4 schedules with one every 6 hours each day. This provides annunciation at the monitoring station within 6 hours of a failure on either phone line.
The below example describes using 4 schedules, 6 hours apart at 01:00, 07:00, 13:00 and 20:00.
Create 4 skeds 6 hours apart (see figure 2), each configured with Function= Send Test Report. Select the following options In the Function area of each Sked (see figure 3).