Mitel 430 System Manual page 120

Installation
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
Power supply critical xy m
prox.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 availa-
ble power. A warning is shown on the display if the result is inadequate:
weak: External power supply required!
Notes
– 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 Tab. 52: 1220 mW
Fig. 43 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
• Maximum line length for a wire diameter of 0,6 mm: 1200 m
Example 2:
An MiVoice 5380 with 2 MiVoice M530 expansion key modules
Power requirements as per Tab. 52: 1340 + 300 + 300 = 1940 mW.
Fig. 43 indicates:
• Maximum line length for a wire diameter of 0,4 mm: 520 m
• Maximum line length for a wire diameter of 0,5 mm: 820 m
• Maximum line length for a wire diameter of 0,6 mm: 1170 m
Example 3:
120
is generated on the phones connected last (accuracy ap-
Line power too
Mitel 415/430 as of R4.1
syd-0580/1.2 – R4.1 – 08.2016