AT&T DS1/DMi/ISDN-PRI manual 16SAMPLE Installation and Maintenance Problems

B-16SAMPLE 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			FUNCTION
	COLOR
	.
1	.	9
	.		TRANSMIT
	.	W/BR
BR .
3	.	11
	.		RECEIVE
	.
	.	W/GR
GR .
	.
5 / 6 .		13
	.		LOOPBACK
SL-?	.	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.