L3Harris NARDA AMS-8061, User Manual

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7-4 Troubleshooting
Take this example:
In this case the control unit remains ON for 1 hour (4 quarters of an hour)
every 24 hours starting at 12:05 every day
The area monitor is switched ON at 11:30.
In this case, at exactly 12:30, the control unit modem will be forced to shut
down.
If you try to contact her at 13:00 you would not be able to, because the area
monitor has turned OFF the modem (60 minutes have passed since it was
switched on) and will turn it back ON only the following day at 12:05, and
then perform the same operation every day.
Instead, if the same unit had been turned ON at 10:50 there would be no
problems. Because the forced shutdown would occur at 11:50 and the next
programming cycle requires that it be turned back on at 12:05. Then
contacting her from 12:05 to 13:05, even the same day, you would find the
modem ON and ready for communication.
All this is correct if the control unit is not faulty, there is a good GSM
coverage, the SIM you are using is enabled to send and receive DATA and
you do not have any PIN enabled.