This part is a kind of semiconductor called AR8030.

Function of this product has Integrated 10/100/1000 Mbps Ethernet Transceiver.

Manufacturers : Atheros Communications

Image and pinout :

Some of the text within the PDF file :

Data Sheet March 2012 Ver. 2.1 AR8035 Integrated 10/100/1000 Mbps Ethernet Transceiver General Description The AR8035 is part of the Arctic family of devices - which includes the AR8031, AR8033, and the AR8035. It is Atheros’ 4th generation, single port 10/100/1000 Mbps Tri-speed Ethernet PHY. It supports RGMII interface to the MAC.™ The AR8035 provides a low power, low BOM (Bill of Materials) cost solution for comprehensive applications including consumer, enterprise, carrier and home networks such as PC, HDTV, Gaming machines, Blue-ray players, IPTV STB, Media Players, IP Cameras, NAS, Printers, Digital Photo Frames, MoCA/Homeplug (Powerline)/EoC/ adapters and Home Router & Gateways, etc. The AR8035 integrates Atheros latest Green Ethos® power saving technologies and significantly [ ... ]

AR8030 PDF Datasheet Download