Installation
126
Mitel SMB Controller
syd-0657/2.0 – R6.0 – 09.2018
Fig. 43
Power available case 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:
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
d = 0.6 mm
d = 0.5 mm
d = 0.4 mm
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d=0.6mm
d=0.5mm
d=0.4mm
Pmax [mW]
R [Ohm]
d=0.4mm
d=0.5mm
d=0.6mm
Power available B on the DSI-AD2 bus Pmax [mW]
Loop resistance R [Ohm]
Line length L [m]
d: Wire diameter
