<P>A single power supply is standard equipment in the Cisco 7513 - a second power supply, if installed, provides redundant power. In systems with redundant power, the power supplies are load sharing and fully hot swappable. You can remove and replace one power supply, while the remaining power supply immediately powers up to provide full power and to maintain uninterrupted system operation. The DC-input power supply is a modular power supply for the Cisco 7513 multiprotocol, multimedia routers. Power supplies reside in power supply bays (labled Power A and Power B) in the rear of the router chassis. </P>