The transfer is always transparent in the USB 2.0 High Speed mode. If you want to connect mass storage devices at the remote part, the USB 2.0 memory option has to be activated. The remote unit use a internal USB 2.0 HUB, each of the 4 USB ports delivers 500mA.
Restrictions:
The local part must be connected to a root hub on the PC. USB devices on the remote part must be directly connected without use of a hub. The achievable transmission rate is approximately 64 Mbit / sec.