AT&T System 75, Wiring Diagram

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110-Type Hardware Description
Table 2-A. 25-Pair Cable Termination on a 110-Type Wiring
Block/66-Type Connecting Block (Contd)
25-Pair Cable
110-Type
66-Type
Connector
Wiring/Conn
Block
Pin Pair Color
Terminals
Numbers
46 V-BL
41
21
21 BL-V
42
47
22
V-O
43
22 O-V
44
48
23
V-G
45
23 G-V
46
49
24
V-BR 47
24 BR-V
48
50
25
V-S 49
25 S-V
50
The 110-type hardware consists of 110A- and 110P-type hardware. The
110P-type hardware uses patch cords to make cross-connections. This
allows the customer to make cross-connections. The 110A-type
hardware uses individual jumper wires for cross-connections. For this
reason, the 110A-type hardware is not intended for customer usage
because it requires technically skilled personnel to make
cross-connections. The 110A- and 110P-type hardware should not be
mixed together in the same room.
110A-Type Hardware
The 110A-type hardware consists of a 100- or 300-pair wiring block and
the associated connecting blocks. The 100-pair wiring blocks (Figure
2-4) are arranged for field termination. The 300-pair wiring blocks
(Figure 2-5) come in both field-terminated and connectorized (with
6-foot cable stubs) types.
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