Patent ID: 9558435
Date: 2017-01-31
CPC Classifications: G06K,H04M

Claim:
1. A communication apparatus comprising: a network connector connectable to a telephone network; a communication circuit electrically connected to the network connector, the communication circuit configured to perform transmission and reception of signals with the telephone network through the network connector; a main power supply configured to supply a supply target including the communication circuit with power for allowing the supply target to operate, the communication circuit being configured to operate by using power supplied from the main power supply; a network-event detector electrically connected to the network connector, the network-event detector configured to detect an electrical change in the telephone network as a network event; a backup power supply provided separately from the main power supply and configured to be charged with power supplied from the main power supply during operation of the main power supply, the backup power supply having a backup voltage; a backup-voltage detector configured to operate by using power supplied from the backup power supply in a state where an operational mode of the communication apparatus is set to a stopped mode, and to detect occurrence of a voltage reduction state in the backup voltage; a power-supply controller configured to operate by using power supplied from the backup power supply in the stopped mode, and to output a signal for starting operation of the main power supply and to set the operational mode to a normal mode in response to an occurrence of the voltage reduction state detected by the backup-voltage detector, the stopped mode being a mode in which the main power supply stops supply of power to the communication circuit and to the backup power supply, the normal mode being a mode in which the main power supply supplies the supply target with power; a discharging path connected to the backup power supply; and a main switch configured to: