This part is a kind of semiconductor called RTL8309N.

Function of this product has SINGLE-CHIP 8-PORT 10/100MBPS ETHERNET SWITCH CONTROLLER.

Manufacturers : Realtek Microelectronics

Image and pinout :

Some of the text within the PDF file :

RTL8309N SINGLE-CHIP 8-PORT 10/100MBPS ETHERNET SWITCH CONTROLLER DATASHEET Draft Rev. 1.0 10 January 2012 Track ID: 9-Port 10/100Mbps Ethernet Switch Controller i Track ID: Rev. 1.0 RTL8309N Datasheet COPYRIGHT ©2012 Realtek Semiconductor Corp. All rights reserved. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means without the written permission of Realtek Semiconductor Corp. DISCLAIMER Realtek provides this document “as is”, without warranty of any kind, neither expressed nor implied, including, but not limited to, the particular purpose. Realtek may make improvements and/or changes in this document or in the product described in this document at any time. This document [ ... ]

RTL8309N PDF Datasheet Download