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Definition: PoweredUSB

(1) (powered USB) A USB port on a computer that can charge a portable device even when the computer is turned off, as long as it is plugged into the wall.

The Yellow USB
The yellow USB port is live for charging even when the computer is turned off.

(2) (PoweredUSB) A high-power USB interface from IBM that provides six amps at 5, 12 and 24-volts. Used for peripherals that need more than the standard USB maximum 500 milliamps, power is transferred in separate wires within the cable. See USB.

Sockets on the Host Side
The power socket is stacked above the standard USB socket, and PoweredUSB plugs insert into both cavities. Notice how sockets are keyed differently depending on voltage. The other side of the cable is typically permanently attached to the peripheral device.