44
Installation
Port Assignment, Termination, Cable Length
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? Comfort Pro S’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.
Connecting to the network (NTBA)
You can connect up to 8 terminals (ISDN telephones, ISDN fax machines, ISDN base stations and ISDN
terminals, ISDN cards for PCs etc.) to each internal S
0
bus. The power for three of these terminals can be
supplied by the bus. Where more devices are used, they will need their own power supply. The length of the
four-wire cable of an internal S
0
bus must not exceed 130 m. Each internal S
0
bus has a capacity of about
3 W. The internal S
0
buses enable point-to-multi-point calls using the DSS1 protocol (Euro ISDN) and support
the same features as Deutsche Telekom ISDN.
NTBA
S01 external S02 external
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