This part is a kind of semiconductor called RTL8111B.

Function of this product has Integrated Gigabit Ethernet Controller.

Manufacturers : Realtek Microelectronics

Image and pinout :

Some of the text within the PDF file :

RTL8111B INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS™ APPLICATIONS DataShee DATASHEET Rev. 1.1 24 March 2005 Track ID: JATR-1076-21 DataSheet 4 U .com RTL8111B Datasheet COPYRIGHT ©2005 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 produ [ ... ]

RTL8111B PDF Datasheet Download