On Sunday, April 17, 2011 01:37:23 am Alan Stern wrote: > On Sat, 16 Apr 2011, Marcel wrote: > > I hooked up the analyzer between the G45 and HUB. While not > > communnicating with the devices, the HUB disconnects and the analyzer > > shows one bad Frame Length error. > > What direction is the packet that gets the error? Is it OUT from the > G45 to the hub? According to my analyzer (lecroy USB advisor) it is OUT from host (G45) to HUB. > > This is all I see. After this the HUB reconnects. Everytime this > > > > happens I see a bad frame length error. > > This doesn't really sound very hopeful to me :-( > > The reconnect is more or less, once a disconnect occurs. The reason > for the disconnect isn't clear. The upstream port on a high-speed link > tells when the downstream port has disconnected by monitoring the > signal amplitudes on the data lines; the change in impedance when the > downstream port's high-speed terminations are removed causes them to > change. This is explained in detail in section 7.1.7.3 of the USB-2.0 > specification. OK. I fear that can only happen when the HUB chokes on something, like the bad frame and since this seem to come from the G45 I guess a hardware bug is really a possibility. Best regards, Marcel -- 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
