Expansion Stages and System Capacity
46
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
3. 2. 2 Power supply
Internal power supply unit PSU2U
The Aastra 470 communication server is powered as standard directly with a mains
cable. The voltage converter needs to be set to the correct position to match the
mains power (230 VAC or 115 VAC) (see also "Powering the communication server",
page 103). The internal power supply unit PSU2U powers all the system compo-
nents and a limited number of connected terminals.
External auxiliary power supply APS2
The external auxiliary power supply APS2 is used for the following purposes:
• Increasing the supply power available. This is required only for systems which
are to operate a large number of terminals without their own power supply.
• As a redundancy for the internal power supply unit PSU2U. If either the internal
or the external power supply unit fails, the system switches over to the intact
power supply, without interruption.
The external auxiliary power supply APS2 is also powered by the 115/230 V mains.
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