AT&T Release 2.0 manual RJ21X Interface, RJ21X Network Interface Connector

Connecting the Control Unit to the Network Interface

RJ21X Interface

The RJ21X network interface has a female 50-pin (25-pair) amphenol connector. See Figure 4-1:

66-Type Block (RJ21-type) 25-Line Interface

Line

Top

Ring

Phone Number

Line 1

26

1

26

1

555-3827

1

2

27

2

555-3828

27

Line 2

3

28

3

555-3829

2

Line 3

28

●

●

●

●

●

●

3

●

●

●

●

●

●

29

Line 4

25

50

25

555-3851

4

Line 5

30

RJ21X

5

Line 6

31

U S O C

6

CUSTOMER

●

JACJ NO.

●

●

●

●

●

●

●

●

●

TO BE OPENED

●

BY AUTHORIZED

TELEPHONE

CO.

Line 25

50

PERSONNEL

ONLY

25

PROTO-TEL

BOULDER, CO.

Figure 4-1. RJ21X Network Interface Connector

To connect the RJ21X interface to the control unit, you must build a wiring field between the RJ21X interface and the control unit. This field, in effect, converts the female amphenol connector to 8-wire modular jacks.

Wiring 4-5