/dev/usb/ehc
Description
Appears to be a way to address usb devices via EHCI (USB 2.0) - unsure if this works for both oh0 and oh1 or just oh0.
Devices
/dev/usb/ehc/0b95/7720
ASIX AX88772 USB2.0 to Fast Ethernet Adapter (referenced in IOS eth driver)