AT&T System 75, Wiring Diagram

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66-Type Hardware Description
CLEAR PLASTIC
DESIGNATION
STRIP
Figure 2-11. Designation Strip
66-Type Hardware Description
The 66-type hardware consists of non-connectorized or connectorized
connecting blocks. The connecting blocks can be mounted individually
or in multiple arrangements. All 66-type hardware uses the same basic
connecting block, a 66M1-50.
66M1-50 Connecting Block
The 66M1-50 (Figure 2-12) connecting block is a plastic connecting
block containing quick connect terminals sized to terminate 20 to 24
gauge wire. It has 50 rows of terminals with four terminals in each row.
The first two and last two terminals of each row are connected together
and each row is split between the second and third terminals (Figure
2-12). These terminals provide space to terminate one 25-pair cable and
the associated jumpers. The terminals slice the insulation of the wires
when the wires are punched onto the terminals. The standard
termination for a 25-pair cable on a 66M1-50 connecting block is shown
in Table 2-A. The 66M1-50 connecting block can be mounted directly on
2-23