Installation
53
Port Assignment, Termination, Cable Lengths
S
0
Ports
Whether you use the switchable S
0
ports for internal or external communication
depends on your communications requirements and the existing basic accesses.
Note that the S
0
bus requires a terminating resistor of 100 ohms at each end.
In the case of the OpenCom 100, the S
0
buses are terminated by software. You make
this setting in the S
0
port configuration in the Configurator on the Web console.
You can connect up to eight terminals on every internal S
0
bus; up to three of the ter-
minals can operate without an external power supply. The length of the four-wire
cable of an internal S
0
bus must not exceed 150 m. The power consumption of each
internal S
0
bus is approx. 2 W.
S
0
Ports on Interface Cards
The S
0
bus is terminated at one end by the OpenCom 100.
IAE = ISDN socket (German: “ISDN Anschluss Einheit”) or an ISDN terminal.
TR = terminating resistor, the S
0
termination. The TR must be at the termination of the line.
This can also be done by an appropriately wired IAE.
The S
0
bus is terminated by the TR at the ends.
OpenCom
R
IAE IAE
TR
OpenCom
R
IAE
TRTR
IAE
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