PoweredUSB, also known as Retail USB, USBÂ PlusPower, USBÂ +Power, and USB Power Plus, is an addition to the Universal Serial Bus standard that allows for higher-power devices to obtain power through their USB host instead of requiring an independent power supply or external AC adapter. It is mostly used in point-of-sale equipment, such as receipt printers and barcode readers. PoweredUSB, as a proprietary variant of USB, was developed and proposed by IBM, Berg Electronics (now a subsidiary of Amphenol), NCR Corporation, and Microsoft between 1998 and 1999, with the last revision (0.8g) issued in 2004. The specification is not endorsed by the USB Implementers Forum (USB-IF). IBM, who owns patents to PoweredUSB, charges a licensing fee to manufacturers for its use. More information...
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