DoorBird D21 Série Manuel D'installation page 15

STEP 5: ASSEMBLING THE MOUNTING HOUSING
Assemble the mounting housing (backbox) to the wall. You can find detailed
drawings and measurements of the device in the corresponding datasheet of
the device.
If you must drill holes in a wall, insert screws into a wall or lever up a
wall, ensure that no cables or mains (gas, water, etc.) are to be found
in the wall.
STEP 6: POWER SUPPLY OPTIONS
The device can be powered using the power-supply unit (mains adaptor)
supplied with it (Option 1) or via PoE (Power over Ethernet) using a network
cable (Option 2). The device can be alternatively also be supplied with power
using a DIN-rail power supply unit that you can obtain direclty from us.
The device does not use battery power.
Option 1: Power supply using the power-supply unit (mains adaptor)
The power supply unit (mains adaptor) supplied with the device has a 300 cm
long cable with two insulated wires.
Do not plug the power supply unit into the wall socket yet. Only use
NOT I C E
the power supply unit provided along with the device, or a DIN-rail
power supply unit that you can obtain from us separately, since this
has been specially stabilized electrically and is equipped with an
integrated audio interference reduction device. Other power supply
units may destroy the device or cause poor transmission quality.
The warranty expires automatically if you use a different power
supply unit.
Option 2: Power supply via PoE
To power the device via a PoE-Switch (e.g. D-Link DGS-1008P) or PoE-Injector
(e.g. DoorBird Gigabit PoE Injector A1091) in accordance with the PoE standard
IEEE 802.3af Mode A, the four wires bearing the numbers 1, 2, 3 and 6 of a
Cat.5 cable or better are to be used. A Cat.5 cable or better must be used as
network signals can only be transmitted over completely insulated, shielded
and twisted cables. If you use PoE as a source of power the four wires for PoE
then simultaneously form the data link. The device won't start if your PoE-
Switch/PoE-Injector does not support the PoE Standard IEEE 802.3af Mode A
(see Diagnostic-LED and Diagnostic-Sounds).
1. Disconnect the PoE-Switch or PoE-Injector from the power grid.
2. Run the network cable to the installation location of the device.
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