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B-16
SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS
Table B-3, 15-Pin Connector Arrangement (System 75/85 Perspective), shows the 15-pin connector
arrangement.
TABLE B-3. 15-Pin Connector Arrangement (System 75/85 Perspective)
DS1 OR DMI PINOUT FOR
15-PIN CONNECTOR
PIN NUMBERS
COLOR
FUNCTION
1
9
TRANSMIT
BR
W/BR
3 11
RECEIVE
GR
W/GR
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
5/6
13
SL-?
LOOPBACK
W/SL
OTHERS NOT USED
The loopback (remote test) leads are normally open (NO) between pins 5 and 13, and normally
closed (NC) between pins 6 and 13. There are two types of 8-pin modular jacks. The RJ48X
contains a shorting bar that is disconnected when the jack is inserted into the plug. The RJ48C jack
is identical to the RJ48X except for the shorting bar. This interface has been accepted as the ISDN
basic access connector and is now being recommended as an optional ISDN-PRI connector. Table
B-4, 8-Position Modular Jack Pin Assignments (System 75 and System 85 Perspective), shows the
8-position connector pin assignments.