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USB "On-The-Go" (OTG)
There is also a supplement to USB 2.0 called USB "On-The-Go" (OTG) which supports point-to-point peer style hookups for USB devices that are often used without a PC host. Few end-user OTG products exist yet; newer embedded Linux systems can be used to implement them. OTG relies heavily on those new USB "Mini" connectors, and supports low power operation (battery friendly).
The key change in OTG is defining a new "Dual-Role" type of peripheral, which can become a low-power USB host when you connect it to another peripheral. Most OTG-capable peripherals will have special Mini-AB sockets (new in OTG). Because of how the USB "mini" plugs and jacks work, Mini-AB sockets accept either the Mini-B peripheral jack at one end of a USB cable or the (new in OTG) Mini-A host jack at its other end. Use the peripheral end, and they start out as a peripheral. Use the host end, and they start out like a USB host ... so that you could print directly from your camera or phone, hook a keyboard up to your PDA, or swap songs with your friend's MP3 player. If you connect two different dual-role devices, the "wrong" one may be initialized as the host. In that case, the optional OTG Host Negotiation Protocol (HNP) lets devices switch roles between "host" and "device" instead of forcing users to switch the cable around.
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