Doorbird A1072, PoE+ 2-wire Ethernet converter

The DoorBird 2-Wire Ethernet PoE+ Converter is
probably the world's smallest and most powerful
converter, enabling you to transmit network data
(Ethernet) and power (PoE+) over a simple two-wire
cable over long distances.
This allows you to equip existing buildings that only have
a simple two-wire bell wire, for example,
with network technology without having to
retrofit network cabling.

The advantages:

∙ Use of existing cabling
∙ Only one two-wire cable required for both data
transmission and power supply (PoE+)
∙ Compatible with PoE+ and PoE devices
∙ Ultra-compact, robust housing
∙ Quick and easy installation