Expansion Stages and System Capacity
91
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
Overload shutdown
If 80% of the available power output is exceeded, the event message Terminal
power supply overload is generated.
If 100% of the available power output is exceeded, the event message Terminal
power supply switch off is generated. The power supply is then shut down step by
step, starting with the expansion slots with the highest numbers and, within the
cards, with the ports with the highest numbers. The terminal ports (FXS, DSI, BRI-S)
are switched off in group of 4 ports. The exchange ports (PRI, BRI-T, FXO) are never
shut down.
Once the power required drops below 100% as a result of the shutdowns, the dis-
connected ports are reconnected after approx. 10 seconds. If the limit of 100% is
again exceeded, the overload shutdown is triggered once again.
The overload shutdown works in principle for all three types of power supply (see
Tab. 33). However it triggers particularly in cases where only the internal power
supply unit is available and a large number of terminals are operated without their
own power supply.
If an overload occurs, either reduce the required supply power (e.g. by powering
DECT radio units and or system phones locally) or use the external auxiliary power
supply unit for terminals.
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