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24
Switch Termination Resistors
The termination resistors for the internal and external S
switched on or off with help of the DIL switch on the circuit board (see
Pic.
23). The external S
port „S
0
If the corresponding S
port of the PBX is at the beginning/end of sev-
0
eral units or if there is only one connection between two units, the
appropriate termination resistors need to be activated.
This is the case e.g. if the PBX is connected directly to the NTBA as a
single device which is always the case with a PTP connection. (Excep-
tion: An ISDN connection box with integrated terminal resistors was
switched in between).
The termination resistors needs to be activated e.g. if you lay an internal
S
bus to two directions starting at the corresponding internal S
0
But you also have to deactivate the termination resistors if you con-
nected an external S
bus directly to the NT with termination resistors
0
in the last connection box and if you connect the PBX to one of these
connection boxes.
In the individual installation chapters the different possibilities will be
explained in detail again. (see
nal S0 Port) on page 21
and
Bus) on page
20).
Pic. 23: Termination resistors
on / off
switched on
Switch Termination Resistors
ports are to be
0
1" is not terminated.
0
chapter Installation of Wall Jacks (inter-
chapter Install Wall Jacks (External S0
on / off
switched off
port.
0
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