Mitel SMB Controller User Manual

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C
ABLING INTERFACES
CHAPTER 4 INSTALLATION
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 5370Maximum 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
• Maximum line length for a wire diameter of 0,6 mm: 1200 m
Example 2:
An MiVoice 5380 with 2 MiVoice M530 expansion key modulesPower requirements as per Maximum
power requirements of the system phones on the DSI bus: 1340 + 300 + 300 = 1940 mW.
Power available case A on the DSI-AD2 bus
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:
Evaluation of an existing line installationLine diameter: 0.5 mmLoop resistance: 120 W
Power available case A on the DSI-AD2 bus
indicates:
• Line length: 660 m
• Power available: 2120 mW
Cable Requirements
Table 4.23:Requirements for an DSI bus cable
Core pairs x cores 1 x 2 o 1 x 4
Stranded
yes
1
1. Note: max. 25 m can be crossed unstranded. (CH: Applies also to cable type G51)
Wire diameter, core 0.4…0.6 mm
Screening recommended
Characteristic impedance lt; 130 W (1 MHz)

Mitel SMB Controller Specifications

General

Brand	Mitel
Model	SMB Controller
Category	Controller
Language	English