Installation
54
Termination on an ISDN socket
Switchable S
0
port on a pressure terminal
You can add further S
0
ports to the OpenCom 130 / 150 by installing suitable interface
cards in a slot. These S
0
ports can be switched between internal and external oper-
ation.
Annotation concerning an OpenCom 130:
In contrast to the basic module, the expansion module does not provide any addi-
tional RJ45 jacks for external S
0
ports. Therefore you can also use the pressure ter-
minals of the expansion module for an external S
0
port. The port assignment of the
pressure terminals is changed when the switch is made from internal to external oper-
ation. This can be seen in the diagram.
Tip: Let us say you have activated an IAE on an internal S
0
port, for ex-
ample. If you switch this S
0
port to external operation, you re-
quire a crossed ISDN line to connect the IAE to an NTBA. The as-
signment of a crossed line is described in the chapter PBX
Networking under Direct Connection starting on page 160.
U
pn
Ports
Each of the U
pn
ports enable the connection of a RFP 22 / 24 DECT base station, an
Aastra 6771 / 6773 / 6775 (OpenPhone 71 / 73 / 75) or an OpenPhone 61 / 63 / 65 tele-
phone using a twin-wire cable.
1a
1b
2a
2b
TR
TR
S
0
int
2a
2b 1a 1b
12345678
S
0
ext
1a
1b 2a 2b
12345678
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