Mitel Aastra 470 System Manual page 134

Installation
Power available B:
Applies to the SB-4+/SB-8 DECT radio units with hardware version "-2" and system
phones of the Dialog 4200 series.
3600
3500
3400
3300
3200
3100
3000
2900
2800
2700
Pmax [mW]
2600
2500
2400
2300
2200
2100
2000
1900
1800
1700
1600
1500
1400
1300
1200
R [Ohm]
1100
1000
900
800
700
600
500
Fig. 48 Power available B on the DSI-AD2 bus
Notes
– If another system phone is operated on the DSI-AD2 bus in addition to
an Aastra 5361, Aastra 5370 or Aastra 5380, at least one phone must be
powered by a local power supply unit.
– An Aastra 5370 or Aastra 5380 with an Aastra M535 expansion key
module always requires a power supply unit.
– An Aastra 5380 with 3 Aastra M530 expansion key modules always
requires a power supply unit. With 2 expansion key modules the use of
power supply unit depends on the line length and the line cross-sec-
tion.
134
d=0.6mm
d=0.5mm
d=0.4mm
d=0.4mm
d=0.5mm
d=0.6mm
Line length L [m]
620
600
d: Wire diameter
580
d = 0.6 mm
560
d = 0.5 mm
540
d = 0.4 mm
520
500
480
460
440
420
400
380
360
340
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014