Technical data

214 Notes on USB Electrical Compliance Testing
7 Low and Full Speed Tests
Test Instructions
The USB automated test application will prompt you to perform these
steps:
1 Invoke the HS Electrical Test Tool software on the Hi- Speed Electrical
Test Bed computer. Select Device and click the [TEST] button to enter
the Device Test menu.
2 On the Device Test Menu of the HS Electrical Test Tool software, click
[Enumerate Bus] once. All devices attached to the host controller
should appear in the device enumeration list.
3 Highlight the device under test and select LOOP DEVICE
DESCRIPTOR from the Device Command drop down menu. Click
EXECUTE once.
4 If you do not know which VID/PID belongs to the device under test,
unattach the device under test and enumerate the bus once. Then
reattach the device under test and enumerate again, this time paying
attention to the new device attached.