It is connected via magnetics to outside world. The magnetics we use is embedded in to the RJ45 plug we use. The part number for the plug is 08B0-1X1T-06-F from Bell Fuse.
We have several RS232/422 serial ports also used from this chip along with some LEDs. The chip seems to run well as all other serial ports and LEDs working ok. Only Ethernet stops working. We have about 10% failures so far.
