Aastra 470, Системное руководство, Страница: 116 / 250

Installation
116
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
• 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
Ω
Fig. 47, page 113 indicates:
• Line length: 660 m
• Power available: 2120 mW
Cable Requirements
Tab. 57 Requirements for an DSI bus cable
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 configured 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)
.
Core pairs
×
cores 1
×
2 or 1
×
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 < 130
Ω
(1 MHz)
1)
Applies in Australia only