The question is somewhat unclear, but I think I understand what you're going for.
--------- --------
|Basebox|-----|Switch|-----Internet
--------- --------
The answer is that it's basically plug and play. If the switch supports passive PoE around 12-24 volts, then simply enable that and plug an Ethernet cable between the two. If it does not support passive, then you either have to use a separate PoE injector, use a different switch, or use an 802.3af to passive converter such as this one.
Then you just need to configure the router to your specifications.
I solved my issue myself but your answer has good info too – Hamid – 2017-09-27T08:43:45.317