Interconnection Call Station / Extension; Power Over Ethernet - Bosch PRAESENSA Installation Manual

PRAESENSA
12.5.2

Interconnection call station / extension

Every call station must have at least one PRA-CSE call station extension for zone selection,
with a maximum of four extensions.
A call station (A) will automatically assign a connected extension (B) to itself and number the
extensions in succession. Manual addressing is not needed and not possible. The system will
supervise that a configured extension remains connected to its call station.
Refer to: Extension connected to a call station, page 146.
12.5.3

Power over Ethernet

The call station has two Ethernet connection ports with a built‑in Ethernet switch, supporting
RSTP. The call station is an PoE Powered Device (PD). It provides the correct signature and
classification to power sourcing equipment (PSE), so that a PSE sources the right amount of
power to a PD over the Ethernet cables. Although it is sufficient to provide PoE power to only
one port, both Ethernet ports take PoE power for cable redundancy and supply redundancy.
For best availability it is advised to connect each port to a different, independent PSE, such as
a PRA-MPS3 multifunction power supply (ports 1 and 2) or a PRA-ES8P2S Ethernet switch
(ports 1‑8). In case one of the connections fail, or one of the PSE sources fail, the operation of
the call station is not affected. With both connections to the same PSE, there is still
connection redundancy but no PSE redundancy.
The ports of the call station can be looped through to another PRAESENSA device, but at least
one port must be connected to a PSE to power the call station and its extensions. With only
one port connected to a PSE, there is no connection redundancy.
The call station ports cannot source PoE power to subsequent devices, such as another call
station.
To connect the call station, follow the procedure below:
1.
2.
3.
Bosch Security Systems B.V.
Remove the cable cover at the bottom of the call station using a TX10 screwdriver.
– Get access to the two screws via the holes in the table stand bracket.
Use one or two shielded Gb‑Ethernet cables (preferably CAT6A F/UTP) with RJ45
connectors to connect the call station to a PSE port, with PoE enabled.
Put back the cable cover with the two TX10 screws.
LCD call station | PRA-CSLD, PRA-CSLW | en 135
Installation manual 2019.11 | V1.00 |