Installation
Note:
• 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 maximum 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
Power supply critical xy m is generated on the phones connected last (accuracy approx.150 m).
System phones MiVoice 5361, MiVoice 5370, and MiVoice 5380 only:
During start-up, these system phones carry out a detailed measurement of the available power. A warning
is shown on the display if the result is inadequate: Line power too weak: External power supply required!
Note:
• Depending on the power available based on the line length on the DSI-AD2 bus the ringing and
hands-free volume decreases accordingly.
• The backlighting of the MiVoice 5380 display is brighter if the phone is powered by a power supply
unit.
Rating examples
Example 1:
MiVoice 5370 Maximum power requirements as per Maximum power requirements of the system phones
on the DSI bus: 1220 mW
Power available case A on the DSI-AD2 bus indicates:
• Maximum line length for a wire diameter of 0,4 mm: 840 m
• Maximum line length for a wire diameter of 0,5 mm: 1200 m
Release 7.1
System Manual for Mitel SMB Controller 132
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