Power over Ethernet - What is it and How does it work?
RS232/485/422 TO POE ETH (B) - Waveshare Wiki
Inside of an ethernet cable, what are the wires specifically used for? I know that the orange and green pair are used for pins 1,2,3,6 sending/receiving but what about pins 4,5,7,8 blue,
Gigabit Ethernet - Wikipedia
Power over Ethernet (POE) Explained - Understanding and using POE