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
26
Line 1
1
27
Line 2
2

Line Top Ring Phone Number

1 26 1 555-3827

2 27 2 555-3828

3 28 3 555-3829

● ● ● ● ● ●
● ● ● ● ● ●

25 50 25 555-3851

Line 3 28
3
29
Line 4
4
30
Line 5
5
31
Line 6
6
●
●
●
●
●
●
●
●
●
●
●
TO BE OPENED
BY AUTHORIZED
TELEPHONE CO.
PERSONNEL ONLY
50
Line 25
25

RJ21X

USOC
CUSTOMER
JACJ NO.
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