Abstract: A main power supply supplies a supply target including a network connector with power for allowing the supply target to operate. The network connector operates by using power supplied from the main power supply. A network-event detector detects an electrical change in the telephone network as a network event. A backup power supply is provided separately from the main power supply and is charged with power supplied from the main power supply during operation of the main power supply. A normal-mode setter operates by using power supplied from the backup power supply in a stopped mode, and to set an operational mode to a normal mode in response to occurrence of a voltage reduction state in a backup voltage. A forcing discharger discharges charged power of the backup power supply in response to the network-event detector detecting the network event in the stopped mode, thereby generating the voltage reduction state.

Abstract: A network connecting section is configured to operate by using operational power and connected to the telephone network to perform transmission and reception of signals with the telephone network. A main power supply is configured to supply a supply target including the network connecting section with the operational power. A network-event detector is configured to detect an electrical change in the telephone network as a network event. A normal-mode setter is configured to set an operational mode to a normal mode when the network-event detector detects the network event in a state where the operational mode is in a stopped mode. The normal mode is the operational mode in which the operational power is supplied from the main power supply to the network connecting section. The stopped mode is the operational mode in which supply of the operational power to the network connecting section is stopped.

Abstract: A main power supply supplies a supply target including a network connector with power for allowing the supply target to operate. The network connector operates by using power supplied from the main power supply. A network-event detector detects an electrical change in the telephone network as a network event. A backup power supply is provided separately from the main power supply and is charged with power supplied from the main power supply during operation of the main power supply. A normal-mode setter operates by using power supplied from the backup power supply in a stopped mode, and to set an operational mode to a normal mode in response to occurrence of a voltage reduction state in a backup voltage. A forcing discharger discharges charged power of the backup power supply in response to the network-event detector detecting the network event in the stopped mode, thereby generating the voltage reduction state.

Abstract: A network connecting section is configured to operate by using operational power and connected to the telephone network to perform transmission and reception of signals with the telephone network. A main power supply is configured to supply a supply target including the network connecting section with the operational power. A network-event detector is configured to detect an electrical change in the telephone network as a network event. A normal-mode setter is configured to set an operational mode to a normal mode when the network-event detector detects the network event in a state where the operational mode is in a stopped mode. The normal mode is the operational mode in which the operational power is supplied from the main power supply to the network connecting section. The stopped mode is the operational mode in which supply of the operational power to the network connecting section is stopped.