A DC backup power supply system having a battery (5); a charge-discharge circuit (6) for charging and discharging a power between the battery and a DC line; and a control circuit (7) for controlling the charge-discharge circuit, wherein the battery has a n...

A technique is provided for applying secondary or backup power (22) to a networked device (18) in the event of a loss or malfunction of network power. In a control and monitoring network (10). Various devices may receive both power and data signals from a ...