Power over Ethernet (PoE)
You can also power the DoorBird via the integrated network interface using a Power over Ethernet Switch or Injector (PoE 802.3af Mode-A).
PoE 802.3af Mode-A requires four network wires only. We have made the decision to use only four network wires in order to make the on-site installation as easy as possible. The fewer the wires, the easier the installation is. Many other networking products work with only four network wires as well, as this is the most advantageous method.
A small number of PoE Switches and Injectors do not in fact support working with only four network wires and disregard the PoE 802.3af Mode-A standard even if the vendors mention it on their product datasheets.
Most PoE Switches and Injectors support PoE 802.3af Mode-A, as it is an industry standard. We have successfully tested e.g.