Control Panels Telephone communications | en 31
Bosch Security Systems, Inc. Installation Manual 2018.07 | 16 | F.01U.287.180
firmware allows for “called party disconnect” by adding a 35-seconds “on hook” interval to the
dial tone detect function. If the control panel does not detect a dial tone in 7 seconds, it puts
the telephone line on hook for 35 seconds to activate “called party disconnect,” goes off hook,
and begins a seven-seconds dial tone detect. If no dial tone is detected, the control panel
dials the number anyway. Each time the control panel dials the number, the control panel
records this as an attempt.
7.5 Communication failure
If the control panel has a backup route configured and the first two attempts to reach the
receiver over the primary phone line fail, the system switches to the backup route. When it
switches to the backup route, it sends a trouble event, and the event that triggered the
telephone call to the central station follows.
After ten unsuccessful attempts to reach the receiver, the control panel enters communication
failure. The control panel clears any reports queued for the failed route and generates a
COMM FAIL event that shows on the keypads. A trouble sounder can be programmed to
annunciate at the keypads.
One hour after a COMM FAIL event, the control panel attempts to send a COMM RSTL event.
If a communication failure still occurs, the keypad trouble sounds again.
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