Port Assignment, Termination, Cable Length
46
Installation
Port Assignment, Termination,
Cable Length
S
0
Ports
All S
0
ports can be externally connected (i. e. on ISDN network terminations).
The S
0
2 port and all S
0
ports on additionally installed interface cards can also
be internally connected. Simultaneous use of one S
0
port as internal and
external port is not possible.
Whether you use switchable S
0
ports for internal or external communication
will depend on your individual communication requirements and the existing
basic connections.
Please note that the S
0
buses each require a terminating resistor of 100 ohms
at each end.
Check: Is the terminating resistor switched on in the NTBA? Forum 523/524’s
software is used to switch on the terminating resistor. You can adjust this
setting when configuring the S
0
ports in the
Configurator
on the Web
console.
Connect S
0
1 externally or S
0
2 externally to the NTBA (the default setting is
S
0
1 connected to multi-terminal access and S
0
2 connected to system access).
Use the ISDN connection cable provided. For the following example, activate
the
Telephony
:
Ports
:
S0(#)
:
Line termination
option in the
Configurator
. In
the NTBA, 100 ohms terminating resistors between 1a and 1b as well as
between 2a and 2b are required. There are no further devices connected to
the NTBA.
