Grace Internet Radio to Mac

I am trying to connect my Grace Ditigital Internet Radio to my Mac - OS X (10.7.3). The Grace Radio has a USB input, but it doesn’t see the Ethernet connection. It does connect to my Mac using WiFi. I have down loaded and installed the drivers for the Mac. Any ideas of what I might be missing.

For the benefit of others: Mike contacted Grace Digital, and their devices do not have a driver for the ASIX AX88772 chip. Grace Digital sells its own branded USB Ethernet adapter, and they recommend that. Thanks Mike for letting us know!