USB 2.0 Hub testing

The USB 2.0 Device is covered in the USB 2.0 Spec

The USB-IF Compliance program prohibited Full Speed Hubs and are only allowed if they have compound devices.
Compound devices that have no downstream ports accessible are also considered to be a Hub.

For the USB-IF Compliance program the Device should under go the following test:

USB 2.0 Hub  HS UP HS DOWN FS UP FS DOWN LS DOWN Inrush Drop Droop Back Voltage IOP USBCV Power consumption BC CDP
High Speed    High Speed Y A Y A A Y A M Y Y Y Y F
Full Speed  Basic Speed Y A A Y A M Y Y Y Y F

Y = Always required
A = Test required to all accessible downstream ports 
M = Required if there are multiple downstream ports
F = Required if battery charging is supported

When submitting for USB-IF Compliance also take care of the following:
  • Check that the product complies with the USB-IF requirements of the USB-IF Compliance website
  • Complete the Hub Checklists
  • When applicable complete the Hub Silicon Checklist
  • When product complete the Peripheral Checklist of the optional compound devices
  • Make sure that the used cables and connectors are USB-IF certified !!! (check the Integrators List - USB-IF members only-)

NON USB-IF certified Hub silicon

When the USB 2.0 High Speed Hub Silicon is not certified the vendor must also go through the USBHTT.
This can be done by Testroniclabs or by the vendor them self via the USB-IF USBHTT Manufacturer Self-Testing Programa.  In order to run the USBHTT test you will need the Low, Full and High Speed Compliance Tes device from the USB-IF eStore


In addition of the USB-IF Compliance program it's advisable to also perform following test.
  • Test the Checklist items
  • Intens Interoperability test
  • TDR Impedance
  • Real time EYE diagram
  • Testing under different temperatures conditions