Appeal 2007-0642
Application 10/267,877
BACKGROUND
Appellants’ invention relates to a telephone apparatus for stabilizing a
call in a no power operation mode and method for controlling the same.
(Specification 1). An understanding of the invention can be derived from a
reading of exemplary claim 1, which is reproduced below.
1. A telephone apparatus which has at least two processors and
stabilizes a call in a no power operation (NPO) mode, said telephone
apparatus comprising:
a power-on detector for detecting a power-on state of an external
supply voltage to generate a power-on detection signal when said
telephone apparatus is operating in said no power operation mode;
a power switch receiving a central office telephone line loop voltage
outputted from a telephone circuit in a hook-off state and the external
supply voltage, said power switch selectively outputting at least one of
the received voltages as an operating voltage to the telephone circuit;
said telephone circuit being connected to a central office telephone
line, said telephone circuit being operated in response to said loop
voltage on said telephone line during said no power operation mode and
being operated in response to said external supply voltage when said
external supply voltage is received by said power switch; and
a main controller having an operation control port, said main
controller performing a power-on reset operation to boot an internal
system program when said external supply voltage is received by said
main controller during said no power operation mode;
a sub-controller included in said telephone circuit, said sub-controller
outputting a booting prevention signal to said operation control port of
said main controller in response to said power-on detection signal to
prevent said main controller from performing the power-on reset
operation.
2
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