Aastra 470, System Manual, Page: 72 / 250

Expansion Stages and System Capacity
72
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
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
)
×
0.8
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.
Tab. 34 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 values 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.
Tab. 34 Average power requirements of terminals
Terminals Connection Output P [mW]
Aastra 5360
1)
DSI-AD2 interface 280
Aastra 5361 DSI-AD2 interface 680
Aastra 5370 DSI-AD2 interface 680
Aastra 5380 DSI-AD2 interface 820
Aastra 5370, Aastra 5380 with power supply unit DSI-AD2 interface 0
Expansion key module Aastra M530 Aastra 5370 110
Expansion key module Aastra M530 Aastra 5380 120
Expansion key module Aastra M535 Aastra 5370, Aastra 5380 0
2)
Dialog 4220 DSI-DASL interface 390
Dialog 4222 DSI-DASL interface 640
Dialog 4223 DSI-DASL interface 660
EKP expansion key module Dialog 4222, Dialog 4223 45
Radio unit without power supply unitSB-4+ DSI-AD2 interface 1500
3)
Radio unit without power supply unitSB-8 2 DSI-AD2 interfaces 1350
4)
Radio unit with power supply unit SB-4+/SB-8 1 or 2 DSI-AD2 interfaces < 100