Technical data

Hub Hi-Speed Tests 4
Notes on USB Electrical Compliance Testing 93
4 Using the oscilloscope, verify the SOFs (Start Of Frame) packets are
being transmitted on the port under test. You may need to lower the
trigger level to somewhat below 400 mV.
5 Click OK to close the Test Instructions dialog.
Test Instructions, Part 2
The USB automated test application will prompt you to perform these
steps:
1 In the Device Test menu of the HS Electrical Test Tool, ensure that the
hub under test is selected.
2 Select SINGLE STEP SET FEATURE from the Device Command
window. Click [EXECUTE] once.