Expansion Stages and System Capacity
89
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
The basic system and the interface cards generate their own local power supply
with an 80% efficiency. The calculated value must therefore be multiplied by a fac-
tor of 0.8 at the end. The calculation formula is therefore as follows:
P terminals = (P total - P hw) ï‚´ 0.8
The total power requirements of all connected terminals must not exceed the value
Pterminals.
The number of permissible terminals per system depends on the power require-
ments of the individual terminals. Tab. 35 provides details of the average power re-
quirements of the terminals.
Note
The actually required power supply depends strongly on the call traffic,
the wire diameter and the line length to the connected terminals. The val-
ues in the following table are average values under the following
assumption:
– Phones traffic volume: Call Connection 38%, Ringing 2%
– SB-4+ radio unit: Active call connection on 2 channels
– SB-8 radio unit: Active call connection on 4 channels
– Background lighting Aastra 5380: 30% active
– LEDs on terminals and expansion key modules: 20% active.
– Wire diameter: 0.5 mm
– Line length: 200 m
The table below shows the average power requirements of the terminals for a line
length of approx. 200 m and a wire diameter of 0.5 mm.
Interface card 32DSI 4
DSP module SM-DSPX1, SM-DSP1 0.75
DSP module SM-DSPX2, SM-DSP2 1.5
IP Media module EIP1-8 2
IP Media module EIP1-32 2.5
4TAX, 8TAX, 16TAX call charge module 0.1
Application card CPU2 21
1)
Redundant fan unit RFU 3.5
1)
Up to 9 W more if the front-side USB interfaces are connected.
Designation Output P [W]
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