Installation
102
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
Fig. 23 Tree structure principle
4. 4 Powering the communication server
The communications server is powered as standard with 230 VAC or 115 VAC directly
from the mains. The internal power supply unit (PSU2U) is rated for the power require-
ments of a typical system expansion. The external auxiliary power supply unit APS2
can be used to increase the power supply available or to increase operating reliability
(redundancy in the event of a failure on the part of one of the two power supplies). The
communication server can also be operated with the external auxiliary power supply
unit only. To ensure that its operation is maintained even in the event of a mains out-
age, an external uninterruptible power supply (UPS) must be used.
Hazard:
Hazard due to heat generation in the event of short-circuits. The mains power supply connec-
tion must be protected with 16 A maximum in countries with 230 V mains power (for instance in
Europe), and with 20 A maximum in countries with 115 V mains power (e.g. in North America).
The overview table below lists the four different types of power supply with the availa-
ble power outputs:
X
No earth
loops
Communica-
tion server
Socket-outlets
(Main) distribution
board
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