JPHX JP1081B

Overview
The chipset is specified as RD9700. Googlery indicates Corechip Semiconductor (whatever that group is) may be related to this term...

"GS20209" and "JP108-9700" is silkscreened on the bottom of the board.

A 00:E0:4C (Realtek) OUI has been assigned to the device by the manufacturer..