B-14SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS

To fix these problems and establish compatibility across several products, new cable groups were developed. These cable groups specify a standard set of pin assignments for four different connector types. The connector and connection types are the:

●25-pair flat ribbon connector (manufactured by Amphenol Products)

●15-pin D-type connector

●Wire-lugs for screw terminal connections

●8-pin modular jack

Table B-1, 50-Pin(25-Pair) Connector Configurations, shows the 25-pair connector pin assignments. Table B-2,System 75 Versus System 85 Cable Comparisons, shows the various types of permitted cables.

TABLE B-1.50-Pin (25-Pair) Connector Configurations

(INITIAL) SYSTEM 85 DS1 OR DMI

PINOUT FOR 50-PIN CONNECTOR

PIN NUMBERS

FUNCTION

 

 

 

 

 

 

 

 

 

.

 

 

1

.

26

RECEIVE

.

 

.

 

 

 

.

 

 

4

.

 

TRANSMIT

.

5

 

.

 

 

.

 

 

 

.

 

 

 

.

 

LOOPBACK

6

.

31

.

 

 

.

 

 

 

.

 

 

 

 

OTHERS NOT USED

(PDS COMPATIBLE) SYSTEM 75/85

PINOUT FOR 50-PIN CONNECTOR

PIN NUMBERS

FUNCTION

 

 

 

22

47

RECEIVE

 

 

 

 

23

48

TRANSMIT

 

 

 

 

24

49

LOOPBACK

 

 

 

 

OTHERS NOT USED

Page 317 Page 319
Page 318
Image 318
AT&T DS1/DMi/ISDN-PRI manual 14SAMPLE Installation and Maintenance Problems
Page 317 Page 319
Top Page Image Contents