I have a Arduino Yun with PoE with LininoOS version
Linux arduino 3.3.8 #1 Thu Jun 2 12:28:33 CEST 2016 mips GNU/Linux
I have the Version 4.0 of the module.
I often notice that when I connect the module via a USB cable and login via Serial the WAN and WLAN LEDs blink and I can SSH via both the mediums.
However I cannot do the same when the Yun is completely powered via an Ethernet Cable and the I see the Yun frequently restarting and becoming inaccessible via SSH.
I cannot troubleshoot this problem via software as whenever I connect the USB cable along with the Ethernet Cable the power supply switches completely to the USB and the PoE stops and everything suddenly works well again.
Has someone faced the same issue? Is it because of the High Frequency Whistle problem where I need to solder a 100µF Electrolytic Capacitor to the PoE adapter?
I measured the 5 V and 3.3 V pins on the Yun they provide their respective voltages via a multimeter.
I have a Microsens fast ethernet switch with PoE which provides standard (minimum 44V DC)
Apparently, the WAN LED blinks indicating the Ethernet Connection is available however everytime I ping the Yun it goes down.