This part is a kind of semiconductor called IP175B.

Function of this product has 5 Port 10/100 Ethernet Integrated Switch.

Manufacturers : IC Plus

Image and pinout :

Some of the text within the PDF file :

IP175B Preliminary Data Sheet 5 Port 10/100 Ethernet Integrated Switch Features General Description IP175A PCB compatible (pins compatible) IP175B integrates a 6-port switch controller, SSRAM, and 5 10/100 Ethernet transceivers. Built in 6 MAC and 5 PHY Each of the transceivers complies with the Each port can be configured to be 10Base-T, IEEE802.3, IEEE802.3u, and IEEE802.3x 100Base-TX 2k MAC address specifications. The DSP approach is utilized for Support auto-polarity for 10Mbps designing transceivers with 0.18um technology; they have high noise immunity and robust Filter/ forward reserved address option Broadcast storm protection performance. Auto MDI-MDIX IP175B operates in store and forward mode. It Support three MII/RMII ports Support SMI with MDC up to 12.5 Mh [ ... ]

IP175B PDF Datasheet Download