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ISDN connectors
ON
48V DC
SYNC
ALARM
RS-232 A
5 4 3 2 1
9 8 7 6
ISDN wall socket
ISDN bus
Ground braided
shield
ISDN wall socket
ISDN
RS-232 B
USB
5 4 3 2 1
9 8 7 6
Connector panel
from
(TX+ TX- RX+ RX-)
4 5 3 6
RJ45 RJ45
8
1
8
ISDN
ISDN
1
8
8
1
ISDN
RS-422
To next ISDN wall socket via
junction box, if required.
Terminal Name
4
a1
5
b1
3
a2
MCU
6
b2
When the distance between the
CU and the last ISDN wall socket
on an ISDN bus exceeds 10 m, the
termination resistors in the last box
must be incorporated by setting
both slide switches to position ON:
The switches in all other boxes
should be OFF (default setting).
The two RJ45 jacks are connected
in parallel.
1
28
ISDN
ISDN
connector
equipment
1
2
a2
RX+
3
a1
TX+
4
b1
TX-
5
b2
RX-
6
7
8
1 2 3 4 5 6 7 8
38VDC Signal
ISDN port
-
TX+
-
TX-
+
RX+
+
RX-
1
2
3
4
5
6
7
8
RJ45
TX+
TX -
RX+
RX -
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