This part is a kind of semiconductor called PM48-2064K.

Function of this product has 10/100Base-T Dual port Magnetics.

Manufacturers : PPT

Image and pinout :

Some of the text within the PDF file :

PPT 10/100Base-T Dual port Magnetics Features: “Meet The Isolation,Insertion Loss and Return Loss Requirements of IEEE802.3 “Available Industry Standard and Low Profile Packages “Isolation Modules are Available for Most LAN IC Manufacture’s Products “Contact PPT For Further Requirements Electrical specifications@25 Part Number PM48-2064K PM48-2030K Turns Ratio TX 1CT:1CT 1CT:1CT RX 1CT:1CT 1CT:1CT OCL -operating temperature: 0 Cw/w to70 60~80MHz -12dB Min -10dB Min H MIN 100KHz 350 350 (pF) 20 20 DCR ( MAX) 0.9 0.9 1~30MHz -18dB Min -15.5dB Min Return Loss 30-60MHz -14dB Min -13.6dB Min Part Number PM48-2064K PM48-2030K Isolation Voltage (Vrms) 1500 1500 Leakage Inductance ( H MAX) 1MHz 0.4 0.4 CMR (dB TYP) 0.1~100MHz -40 -40 Cross Talk 0.1~100MHz -38 -38 Insertion Lo [ ... ]

PM48-2064K PDF Datasheet Download