134
C
ABLING INTERFACES
CHAPTER 4 INSTALLATION
Cable Requirements
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.
FXS terminal interfaces
The 6 FXS terminal interfaces of the mainboard are permanently routed to the front panel and labelled
accordingly. The 2 remaining not labelled RJ45 sockets are empty and cannot be used. With the appro-
priate interface cards and wiring adapters, additional FXS terminal interfaces can also be made available
at the RJ45 sockets 1.x...4.x. The possible RJ45 sockets are highlighted in colour in the figure below.
Figure 4.41: Connection possibilities for FXS terminal interfaces
Multifunctional FXS interfaces
The analogue interfaces of the FX cards are multifunctional. Depending on the terminal or function they
are configured individually in the Interface configuration using and switched over internally accordingly.
Table 4.27:Requirements for an S bus cable
Core pairs x cores
Stranded
Wire diameter, core
Screening
1 x 4 or 2 x 2
yes
0.4…0.6 mm
recommended
Ohmic resistance
Characteristic impedance
Wave attenuation
Near/crosstalk attenuation
lt; 98 W/km (conductor), lt; 196 W/km (loop)
lt; 125 W (100 kHz), lt; 115 W (1 MHz)
lt; 6 dB/km (100 kHz), lt; 26 dB/km (1 MHz)
> 54 dB/100 m (1 kHz to 1 MHz)
1. Not possible within an AIN
Table 4.28:Mode of the FXS interfaces (Sheet 1 of 2)
FXS mode Socket
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