Watchdog Functionality; Push Button - Bausch Datacom DinBox Reference Manual

7.

Watchdog functionality

To prevent a "total lock-up" of the DinBox GSM/GPRS a long term watchdog is
implemented. This function is created with a separate RISC micro controller. The micro
controller itself is guarded with it's own internal watchdog (+/- 1 second refresh / WD
LED flash).
The power supply to the "Communication Control" processor and the modem module
will be disconnected for a few seconds after +/- 24 hour IF the modem is NOT
connected (inactive DCD signal).
If the reset period is ended and the modem is connected to a remote host (active DCD
signal) the reset will not be conducted.
If the reset period is ended and the watchdog already past a reset, because of an active
DCD signal, the reset will be conducted after +/- 10 minutes !
Otherwise, if the DinBox GSM/GPRS is "locked-up" with an active DCD signal the
watchdog will never be able to reset the WAN module.
8.

Push button

The DinBox GSM/GPRS modem has a simple push button (switch) onto the PCB.
This switch can be used to start-up the DinBox GSM/GPRS without the "Communication
Control" processor. This function is necessary during first-time configuration of the
DinBox GSM/GPRS or for manual communication tests and debugging purposes.
Bausch Datacom NV
DinBox GSM/GPRS Reference manual – V1.0
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