On Tuesday 21 March 2006 8:57 am, Alan Stern wrote: > On Mon, 20 Mar 2006, Steve Calfee wrote: > > > There is nothing illegal > > about having multiple usb bus connections on one device. They could even be > > plugged into the same bus, but they would be enumerated seperately and > > given > > different USB addresses. > > Technically you're correct. Legally I'm not sure. My understanding was > that the USB spec prohibited attaching a USB device to more than one bus.
ISTR it's a branding issue ... except for the bridging devices (which Linux supports as network links) exception you noted. With two upstream devices, I don't think the USB 2.0 brand could be applied. Having two upstream links would certainly be contrary to the ease-of-use goals for USB, and the adoption of physical keying on connectors to ensure that there's no way to mis-connect USB componentry. - Dave > However I can't find any place in the spec where it says that. Instead, > section 6.4.4 (Prohibited Cable Assemblies) says: > > ... > > Note: This prohibition does not prevent using a USB device to > provide a bridge between two USB buses. ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
