An alarm system has an alarm unit in combination with a line seize module. The
alarm unit includes a transmitter/receiver, a control panel function, a key pad,
an input/output port connected to a telephone line and an auto dialer for normally
communicating with a remote monitoring station over the public switched telephone
network. The line seize module includes an input communication port connected to
the telephone line, a signal transmitter and receiver for communication over telephone
wiring with the alarm unit, control logic, a line seize arrangement and an automatic
dialer. Control logic processing signals are received by the input port. The line
seize module, upon receiving an alarm signal from the alarm unit, reports the signal
to a remote monitoring station using the automatic dialer and the public switched
telephone network.
