Hey  @Ricardo603 - Thanks for stopping by!

The outdoor deco can be given both data and power via one ethernet cable and you are on the right track, just missing one key piece - a method of providing PoE power, whether a PoE switch, or PoE Injector. Unfortunately, I do not see PoE functionality on the overview page of your current switch.

This is the 5 Port PoE Switch that our team members use for their Deco X50-Indoor: TL-SG1005P | 5-Port Gigabit Desktop Switch with 4-Port PoE+ | TP-Link

If you only have the one PoE device, you can use a PoE Injector - which essentially is Ethernet and Power in, with only PoE Ethernet out. This is likely the 12V adapter that Google was referencing. We have quite a few ourselves and there are plenty on the market, but take this one as an example

TL-PI30G | PoE+ Injector | TP-Link