110-Type Hardware Description; 110-Type Wiring Blocks; Index Strips And Connecting Blocks - AT&T 75 Wiring Manual

110-TYPE HARDWARE
The 110-type hardware consists of connectorized or field-terminated terminal blocks
available in 100-, 300-, and 900-pair sizes. The 110-type terminal blocks consist of the
following parts:

110-Type Wiring Blocks

Index Strips
3-, 4-, and 5-Pair Connecting Blocks.
110-Type Wiring Blocks
The 110-type wiring block is a plastic wiring block equipped with permanently attached
index strips. A 110-type wiring block is shown in Figure 3-2.

Index Strips and Connecting Blocks

The index strips (Figure 3-3) are slotted rows for 25-pair cable termination. The wires are
placed in the slots to allow the connecting blocks to make connection with the wires. The
standard termination for a 25-pair cable is shown in Table 3-A.
The connecting blocks (Figure 3-3) are equipped with clips that slice the insulation of the
wires when the connecting block is pushed onto the index strip. The top of the connecting
blocks are used for cross-connections. When a wire is punched onto the top of the
connecting block, it makes connection, through the connecting block, with the wire in the
index strip.
3-2

110-TYPE HARDWARE DESCRIPTION

Figure 3-2. 110-Type Wiring Block