Mitel 470 System Manual page 133

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 MiVoice 5361,
MiVoice 5370 or MiVoice 5380, at least one phone must be powered by a local power supply
unit.
– An MiVoice 5370 or MiVoice 5380 with an MiVoice M535 expansion key module always
requires a power supply unit.
– An MiVoice 5380 with 3 MiVoice 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-section.
Automatic detection of critical power supply situations
Only MiVoice 5360, and phones of the Office series:
When a system phone (or a second such phone) is connected to the DSI bus, the max-
imum power input is automatically determined; all the system phones (incl. expansion
key module and alphanumerical keyboard) connected to the interface are taken into
account. The maximum power available is also determined based on the calculated
line length (assumption: Diameter = 0.5 mm). If the calculated power available is below
the maximum possible power input of the connected system phones, the message
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
d=0.6mm
d=0.5mm
d=0.4mm
d=0.4mm
d=0.5mm
d=0.6mm
Line length L [m]
Installation
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
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0
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