This part is a kind of semiconductor called 12PS6121C.

Function of this product has Single 10/100 Base-TX Lan Magnetic.

Manufacturers : Bothhand

Image and pinout :

Some of the text within the PDF file :

Bothhand USA email:sales@bothhandusa.com SINGLE 10/100 BASE-TX LAN MAGNETIC P/N: 12PS6121C DATA SHEET Feature z z http://www.bothhandusa.com Page : 1/1 Operating temperature range: 0°C to +70°C. Storage temperature range: -25°C to +125°C. Electrical Specifications @ 25°C Part Number TX 12PS6121C 1CT:1CT Turns Ratio (±3%) RX 1CT:1CT OCL (uH Min) @100KHz/0.1V with 8mA DC Bias 350 Insertion Loss (dB Max) 1-100MHz -1.2 1500 HI-POT (Vrms) Continue Part Number 1-30MHz 12PS6121C -15 Return Loss (dB Min) 50MHz -13 60-80MHz -11 Cross talk (dB Min) 1-60MHz -40 60-100MHz -35 DCMR (dB Min) 1-100MHz -35 Schematic Mechanical 462 Boston St - Topsfield, MA 01983 - Phone: 978-887-8050 - Fax: 978-887-5434 [ ... ]

12PS6121C PDF Datasheet Download