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66-Type Block (RJ21-type) 25-Line Interface
Line Tip
Ring Phone Number
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
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
To/From
Control
l
Unit
●
1 pr.
1 pr.
1 pr.
RJ21X
Amphonol
Plug
●
●
1 pr.
Line 25
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