ADTRAN ESU 120e Base D rop PBX, Table B-8. Adapter Cable D B25 to X.21, D B15 Connector

A ppendix B. Connector Pinouts

Table B-8. Adapter Cable D B25 to X.21, D B15 Connector

Name	DB25Pin	DA15S Pin
Protective GND (Shield)	1	1
Signal GND	7	8
Control A	4	3
Control B	19	10
Indication A	8	5
Indication B	10	12
Transmit A	2	2
Transmit B	14	9
R eceive A	3	4
R eceive B	16	11
Signal Timing A	15/17	6
Signal Timing B	9/12	13

Base D rop (PBX)

The Drop has a DB-15 female connector as defined in Table B-9.

Table B-9. Pinout Connectors for Terminal Interface

Pin	Name
1	R x Data (output)
2	Frame Ground
3	Tx data (input)
4	Frame Ground
9	R x data (output)
11	Tx data (input)
5,6,7,8,10, 12, 13, 14,15	Not used

B-8 ESU 120e User Manual 61200420L1-1