So I was thinking of doing a PoE setup. However, some things are unclear to me and I'm hoping that you guys can help clarify for me.
So from my understanding, the injector connects to a wall outlet, which is then connected to the router. Then, the splitter is plugged in to a different wall outlet in a different room, which is then connected to a computer via ethernet. This will provide the copmuter with internet through ethernet cable right?
Since my router is upstairs, and my computer downstairs, I'm hoping to have a stable connection through ethernet rather than through wifi
You must be speaking of Powerline networking.
Using the house wiring to carry the networking signal.
Powerline networking should work for you.
PoE as I know it, is supplying the electricity a device needs
through the Ethernet cable.
We sometimes do this to power video surveillance cameras.
There are network switches available that supply the power.
Check out the Powerline networking components at Newegg.