The end user may have a requirement to have more than one identical device attached to the system. Verify that the device application and device driver operate with multiple identical devices attached to the system.
Using the same hub tree as the Fifth Tier Operation - UHCI test, add the second Device Under Test using a five metre cable to a spare port on the tier five hub. If applicable, add the "similar device" to a spare port on the tier five hub.
Ensure all three devices are fully functional:
Hot attach - no installation is required.
Application installation - if required to show functionality
Warm boot - system remains functional
Cold boot - system remains functional
Asynchronous detach and reattach
USB topology change - no driver modification required
Suspend / Resume - functional after resume
Suspend / Remote-wake (if applicable) - functional after wake-up