Most common USB issues

Electrical

• Device Back Voltage
• Device Power Consumption
• Device or Hub Inrush
• Device, Host, Hub Full/Low Speed Signal Eye
• Device, Host, Hub High Speed Signal Eye
• Device or Hub High Speed Receiver Sensitivity
• Hub or Host Drop, Droop

Framework Protocol

• USBCV Failures
• Ch8ck Failures 

Interoperability

• IMPORTANT THINGS TO KNOW
• Device Functionality Test
• Embedded Host Functionality Test