Technical data

138 Notes on USB Electrical Compliance Testing
4 Hub Hi-Speed Tests
EL_9 SE0_NAK Test
The USB automated test application will prompt you to perform these
steps:
1 On the Hub Test menu of the HS Electrical Test Tool, click [Enumerate
Bus] once.
2 Select TEST_SE0_NAK from the Port Control drop down menu. Enter
port number and click [EXECUTE] once to place the port under test
into TEST_SE0_NAK test mode.
3 Click OK to close the Test Instructions dialog.
The USB automated test application will prompt you for the following
voltage measurements: