I don't understand what can happen. If I connect the camera to a POE injector it works and I can see it from a PC directly accessing the IP of the camera. But when I connect it to the DVR, it can't find it. If I connect it to a POE TP-link switch, it can't find it either by accessing the IP of the camera directly.
Is there a difference between the type of POE that an injector offers and the DVR?