T-Comfort 930 DSL, User Manual

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34
Installation Port Assignment, Termination, Cable Lengths
Port Assignment, Termination,
Cable Lengths
S
0
Ports
Whether you use the switchable S
0
ports for internal or external communication depends on your communi-
cations 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 T-Comfort 930 DSL, 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 terminals 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.
The S
0
bus is terminated at one end by the T-Comfort 930 DSL.
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.
T-Comfort 930 DSL
IAE IAE
TR