Thank you Alan, I am still working through understanding the usbmon and this is a helpful hint. I will contact the device manufacturer and see if there is some alternative method they recommend for testing. >Most of the usbmon output shows that a device was attached to port 3 of hub 2 and enumerated as usual over the course of about half a second. > >The very last two lines show the computer sending the hub a Set-Port-Test request on port 3 for test mode 4, which is Test Packet. >The hub's response is a STALL, indicating that the hub doesn't understand or doesn't implement this request. > >Alan Stern >
