On Thu, 9 Feb 2012, Greg KH wrote: > On Thu, Feb 09, 2012 at 09:15:25PM +0100, Olivier DOLE wrote: > > Hello, > > > > I have a question about USB 3.0 and host to host communication through a > > "standard A" to "standard A" cable. > > Not possible at all, on a pure electrical basis. Please read the USB > specification at www.usb.org for why. Actually it _is_ possible in USB-3. That's because unlike USB-2, USB-3 cables use separate wires for TX+, TX-, RX+, and RX-. An A-to-A cable simply has the TX+/TX- pair on each side connected to the RX+/RX- pair on the other side. Nevertheless, although such connections are possible, they require special software to drive them. They are intended for debugging and other specialized uses; the Linux kernel does not currently support them. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
