This part is a kind of semiconductor called RTL8306.

Function of this product has (RTL8306 / RTL8308) 8/6-Port 10/100 Mbps Ethernet Switch Controller.

Manufacturers : Realtek

Image and pinout :

Some of the text within the PDF file :

8308/8306 Preliminary Product Specification Subject to change Realtek 8/6-Port 10/100 Mbps Ethernet Switch Controller with Embedded memory The RTL8308/8306 chip is a 128-pin low cost and ultra low power consumption 8/6-port 10/100M Ethernet switch controller integrated both with a 2M bits embedded DRAM as packet buffer and a 16K entries of address table. The RTL8308 supports reduced MII (RMII) interface. Only single 50MHz oscillator is needed in a switch system to save your Bill Of Material. In addition, the RTL8308/8306 provides a LED display specially to indicate a network loop existence. www.DataSheet.co.kr 1. Features n n n Support eight/six 10/100Mbps Ethernet ports with RMII interface Provided non-blocking and non-head-of-lineblocking forwarding 50MHz 2M bits DRAM is built in as pa [ ... ]

RTL8306 PDF Datasheet Download