Open the following link --speedstream 5200
Download the manual from the link and review page 7 for ethernet connection.
Notice particularly the back of the device. There are four connection points to plug things in the one on the left with DSL is where cable with the phone connectors connects the phone jack to the speedstream 5200. On the right the round connector with the pin is where the power goes. Next to the power connector to the left is a USB connector. In between usb connector and the DSL port is an ethernet connector. One way to avoid the need for the USB software os to use the ethernet connector bu connecting an ethenet cable (wider connector that fits snugly in both ports one on the Speadstream 5200 and the other probably present on your computer.
USB driver including VISTA (if you prefer)USB driver link