AT&T 3.0 manual RJ21X Network Interface Connector

Wiring

66-Type Block (RJ21-type) 25-Line Interface Line 1

Line 2

Line 3

Line 4

Line 5

Line 6

To/From

Control l

Unit ●

●

●

Line 25

Line	Tip	Ring		Phone Number
1	26	1	,	555-3827
2	27	2		555-3828
3	28	3		555-3829
25	50	25		555-3851

USOC
CUSTOMER
JACJ NO.
4 Jacks
1 pr.
RJ21X	Amphonol
1 pr.	Plug
1 pr.
1 pr.

TO BE OPENED

BY AUTHORIZED

TELEPHONE CO.

PERSONNEL ONLY

PROTO-TEL ●

BOULDER, CO

From C.O.

Figure 4-1. RJ21X Network Interface Connector

Connecting the Control Unit to the Network Interface 4-5