Patent ID: 7498692

Claim:
A method for providing distributed uninterrupted DC power supply to an Ethernet power distribution system, the method comprising: receiving an AC power at an input of an AC to DC converter connected to a DC power output port and outputting 48V nominal DC power to the DC power output port; providing backup DC power to the DC power output port from a 48V rechargeable battery pack connected to the DC power output port; outputting 48V nominal DC power from the DC power output port to a power over Ethernet circuitry within one or more power over Ethernet power sourcing devices; regulating a battery voltage from the rechargeable battery pack to a constant DC voltage by a DC to DC converter, the DC to DC converter connecting the rechargeable battery pack to the DC power output port; disconnecting the rechargeable battery pack when the battery voltage reaches a specified level by a low voltage disconnect unit connecting the rechargeable battery pack to the DC power output port; and monitoring and sending control signals to the AC to DC converter, the low voltage disconnect unit, the DC to DC converter, and the power over Ethernet circuitry from a network interface connected to the AC to DC converter and the power over Ethernet circuitry.