Mitel Aastra 470 System Manual page 136

Installation
• 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 
Fig. 47 indicates:
• Line length: 660 m
• Power available: 2120 mW
Cable Requirements
Tab. 61 Requirements for an DSI bus cable
Core pairs  cores
Stranded
Wire diameter, core
Screening
Characteristic impedance
1)
Note: max. 25 m can be crossed unstranded.
(CH: Applies also to cable type G51)
Installation rules
• If an Aastra DECT radio unit is used, do not connect any other system phone to
the same DSI bus.
• If Interface type is set to DSI-DASL, only connect one system phone or one phone
of the Dialog 4200 series to the 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
• Cabling of AD2 terminals is restricted to pairs of a separate dedicated cable(s).
1)
Applies in Australia only
136
1  2 o 1  4
1)
yes
0.4...0.6 mm
recommended
< 130  (1 MHz)
1)
.
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014