External Auxiliary Power Supply Unit - Mitel Aastra 470 System Manual

Installation
4. 4. 2

External auxiliary power supply unit

The use of the external auxiliary power supply unit APS2 is necessary to increase
the operating reliability (redundancy operation) or if the internal power supply unit
is no longer sufficient based on the power requirement calculations or any event
messages generated (power supply overload). It is also connected directly to the
230 VAC or 115 VAC mains. However, unlike the internal power supply unit it does
not have a voltage converter. The voltage automatically adapts to the mains volt-
age.
Fig. 24 Power supply to the communication server
Note
For an external power supply use the optional auxiliary power supply unit
APS2 exclusively.
Tip
In redundancy operation, connect the communication server power sup-
ply and the APS2 auxiliary power supply unit to separately protected
mains power. This will further enhance the system's operating reliability.
102
+ –
24 VDC
Auxiliary power suply
unit (APS2)
Voltage selector
Mains power
115/230 V
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014