DoorBird D21 Série Manuel D'installation page 17

Only related for devices with call button(s)
Each Premium Soft-Touch
call button is equipped with
two jacks.
PORT
LAN/POE
REL1 REL2 BELL
LAN/POE
es es es es wi wi wi with th th th
DESCRIPTION
RJ45 jack to connect a standard Network cable Cat.5
or better, coming from the Internet Router/PoE-Switch/
PoE-Injector.
Do not power the device simultaneously via
N OTI CE
the power supply from the power supply unit
(mains adaptor) and the power supply via PoE.
EXT
call b cal cal cal l l b l b butt utt utt utton( on( on( on( ( s) s) s) s) )
4 Pin 2 Pin
15VDC
17