Hello,

This is my first time designing a PoE+ circuit, and I was wondering if anyone here could point me in the right direction to debug the issue. I am not getting any link, or power when I plug in PoE RJ45 cable. It does have a separate optional power supply source through USB-C, and when I plug that in, power goes through the board and ethernet was able to establish link and RJ45 LEDs are blinking. I did verify the PoE cable on another device and it was working. This is for a carrier board for a compute module (raspberry pi).

Here's what my schematic looks like:




Any advice would be greatly appreciated!

 

I am having a difficulty tracing the power flow thru your circuit. Would yo please provide us with an explanation of the intended power path so that we can better analyze where the problem could be.