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ISDN bus termination
When longer than 10 meters, the end of the ISDN bus must be terminated by two resistors
as shown below. Only one bus/termination per CU.
Be aware that only one ISDN cable is permitted to be longer than 10 meters.
PC - asynchronous data communication
RS-232 A
5 4 3 2 1
9 8 7 6
PC serial port
The driver used with the RS-232 B (DATA) port can
be switched to be used with the RS-422 (DATA) port
instead, see the Operator's Manual.
RX+
100 ohm
TX+
TX -
100 ohm
RX -
ON
48V DC
SYNC
ISDN
ALARM
RS-232 B
USB
5 4 3 2 1
9 8 7 6
USB port
PC serial port
29
Alternative termination:
ISDN bus end plug
ISDN
1
8
8
1
ISDN
RS-422
DTE
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