Power Supply Per Interface - Mitel Aastra 470 System Manual

Expansion Stages and System Capacity
Overload shutdown
If 80% of the available power output is exceeded, the event message
power supply overload
If 100% of the available power output is exceeded, the event message
power supply shutdown
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 shut down in groups 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. 35). 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.
3. 4. 5. 2

Power supply per interface

DSI interface card
The maximal available power supply on the DSI ports per interface is limited. In cer-
tain cases (e.g. 32 connected SB-4+ radio units with HW version " - 2" at a 32DSI in-
terface during simultaneously high traffic load) this value can be exceeded and the
the overload shutdown is triggered. To provide remedy individual terminals must
either be powered locally or spread out on several DSI interface cards.
Tab. 38 Maximal power supply per interface card
Maximal power supply per interface card
DSI interface card
88
is generated.
is generated. The power supply is then shut down step by
Output P [W]
41.5
syd-0337/1.6 – R3.2 – 09.2014
Terminal
Terminal
Aastra 470 as of R3.2