Bausch Datacom – InduBox PSTN III – Reference Manual V1.0c
2. Block Diagram
The block diagram below details the location and interconnection of the different
functional units within the modem. The most important units are briefly described.
AC/DC power supply
The mains supply (ac) must be connected to the InduBox PSTN III modem via a 2 pin
terminal block with screw contacts. Make sure the voltage supplied to the modem is in
the range of the InduBox PSTN III input voltage (see specifications for details on voltage
range).
Long Term Watchdog
A long term watchdog circuit is implemented. The modem will perform a reset each 1 to
168 hour (configurable) and/or if necessary via the external '+V'-connection to prevent a
lock-up. The power supply of the PSTN socket modem module will be disconnected for
a few seconds after the reset period. A ‘heartbeat’-LED (green) is implemented to check
the long term watchdog.
Switched regulator
To create the necessary dc-voltage to power the modem module a 0.5A step down
switching regulator is implemented.
2013 / 04 / 02
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InduBox PSTN III V1.0c E
Summary of Contents for InduBox PSTN III
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