- Powered USB
Powered USB, also known as "Retail USB", "USB Plus Power", and "USB + Power", 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.The standard was developed by
IBM , NCR, and FCI/Berg [ [http://www.poweredusb.org/whatispusb.html What is Powered USB?] ] but is not endorsed by theUSB Implementers Forum (USB-IF) [ [http://www.poweredusb.org/usbstandards.html Powered USB in Retail] ] .IBM, who own the intellectual rights to Powered USB, charges a one-time licensing fee of $5,000 for its use. [cite web|title=PoweredUSB - FAQs and Answers|url=http://www.poweredusb.org/faqs.html 070727 poweredusb.org]Powered USB uses a different type of connector than standard USB, though it maintains the standard USB interface for data communications and adds a second connector for power.
The standard allows for three different voltages, providing power at 5 V (30 W), 12 V (72 W), and 24 V (144 W). The three voltages are able to operate at up to 6 A (traditional USB operates at 5 V and up to 0.5 A) [ [http://www.poweredusb.org/pdf/PoweredUSB_v08g.pdf Powered USB Electro-Mechanical Specification v0.8g] ] .
As each Powered USB plug provides one of three voltages, the plugs come keyed in three versions so they will only accept connections from devices requiring that version’s voltage [ [http://www.poweredusb.org/usbstandards.html Powered USB in Retail] ] .
References
External links
* http://www.poweredusb.org — "An informational website"
* http://www.usbpluspower.org — "Another informational website"
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