US Patent 7627709 Computer bus power consuming device

A power-using device for drawing power over a communication and power bus is provided. The power-using device is adapted to draw only power from the communication and power bus, the bus being connected to a power supply and host computer. The power-using device is further capable of communicating with the bus via a host bus adapter through a communication link not comprised by the bus. The host bus adapter is capable of receiving power and communication from the bus.