120 en | Multifunction power supply, large | PRA-MPS3 PRAESENSA
2019.11 | V1.00 | Installation manual Bosch Security Systems B.V.
11.5.7 Power over Ethernet
The multifunction power supply has an integrated Ethernet switch with 6 external ports. Ports
1 and 2 provide Power over Ethernet (PoE), next to OMNEO and other Ethernet data, present
on the network. These ports can be used to connect one or two call stations, or other devices
that are powered via PoE. Each port is capable of providing enough power for a call station
with four extensions, which is the maximum. A PRAESENSA call station has two Ethernet ports
and can be connected with two cables for fail safe cable redundancy. It is also possible to
connect a call station to two separate multifunction power supplies for additional protection
against failure of its Ethernet switch. Ports3 to 5 cannot be used for PoE powering.
PoE devices can simply be connected using shielded Gb‑Ethernet cables (preferably CAT6A F/
UTP) with RJ45 connectors. All PRAESENSA devices support Rapid Spanning Tree Protocol
(RSTP) to enable the use of multiple connections simultaneously for cable redundancy, e.g. to
daisy‑chain devices in a loop, with a maximum of 21 devices in a loop.
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