Mitel Aastra 470 System Manual page 86

Expansion Stages and System Capacity
Designation
Interface card 32DSI
DSP module SM-DSPX1, SM-DSP1
DSP module SM-DSPX2, SM-DSP2
IP Media module EIP1-8
IP Media module EIP1-32
4TAX, 8TAX, 16TAX call charge module
Applications card CPU2
Redundant fan unit RFU
1)
Up to 9 W more if the front-side USB interfaces are connected.
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 P
= (
terminals total
The total power requirements of all connected terminals must not exceed the value
P .
terminals
The number of permissible terminals per system depends on the power require-
ments of the individual terminals.
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.
86
)  0.8
P
-
hw
Tab. 37
Output P [W]
4
0.75
1.5
2
2.5
0.1
1)
21
3.5
provides details of the average power re-
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014