Installation
121
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
Installation rules
Always terminate the bus extremity with 2
×
100
Ω
(0.25 W, 5%)!
Note
Circuit type as per EN/IEC 60950: SELV
Cable Requirements
Tab. 61
Requirements for an S bus cable
Terminals
The ETSI protocol must be set in the interface configuration.
Up to 8 terminals of different types can be connected to one S bus.
• Standard ISDN terminals
• ISDN Terminal Adapter
• PC with ISDN card
• Group 4 fax machines
1)
, etc.
Two call connections are possible simultaneously for each S bus.
Core pairs
×
cores
Stranded
Wire diameter, core
Screening
1
×
4 or 2
×
2
yes
0.4…0.6 mm
recommended
Ohmic resistance
Characteristic impedance
Wave attenuation
Near / crosstalk attenuation
< 98
Ω
/km (conductor), < 196
Ω
/km (loop)
< 125
Ω
(100 kHz), < 115
Ω
(1 MHz)
< 6 dB/km (100 kHz), < 26 dB/km (1 MHz)
> 54 dB/100 m (1 kHz to 1 MHz)
1)
Not possible within an AIN