Installation
• Maximum line length for a wire diameter of 0,6 mm: 1200 m
Example 2:
A MiVoice 5380 with 2 MiVoice M530 expansion key modules power 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 installation Line diameter: 0.5 mm Loop resistance: 120 W
Power available case A on the DSI-AD2 bus indicates:
• Line length: 660 m
• Power available: 2120 mW
4.7.3.1.1.1 Cable Requirements
Table 50: Requirements for a DSI bus cable
Core pairs x cores 1 x 2 o 1 x 4
Stranded
yes
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Wire diameter, core 0.4…0.6 mm
Screening recommended
Characteristic impedance lt; 130 W (1 MHz)
4.7.3.1.2 Installation rules
• If a Mitel DECT radio unit is used, do not connect any other system phone to the same DSI bus.
• Do not use any terminating resistors at the bus extremity.
• Avoid using different cable cross-sections on the same bus
• Use the supplied cables for connecting the system phones
54
Note: max. 25 m can be crossed unstranded. (CH: Applies also to cable type G51)
Release 7.1
133 System Manual for Mitel SMB Controller
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