Telecommunication Room Terminations - LAN Wiring - page 157

FIGURE 7.2
The 110C connecting block is a small, waferlike plastic housing containing metal contact clips
at opposite edges. (Courtesy of The Siemon Company.)
wires are punched onto the top of the block. The action mechanically holds the con-
ductors in place and makes electrical contact between the cross-connect wires and
the underlying station cable wires that were previously terminated at the back of the
block.
The routing of wires in and around the wiring block is one of the advantages
of the 110 system. Station cables are routed to the wiring block from the rear of the
wiring block. They are terminated on the back edge of the connecting blocks and
are out of the way during the cross-connect operation. Cross-connects are made
with unjacketed paired wire that passes in the troughs between horizontal index
strips to reach the front edge of the appropriate 110 block. The positions on the
wiring block may be easily identified by labels that attach to the block, unlike 66
blocks that have only a very small plastic surface for circuit marking. The labels fit
into clear plastic label holders that snap onto the wiring block between the rows of
the horizontal index strips. The labels are typically marked with thin vertical lines
between station positions. Thus, a label for 4-pair cable will have the lines every
eight index positions. The labels do not interfere with the routing or tracking of
cross-connect wires.
The 110 system is designed for AWG 22 to 26 plastic insulated wires. The 110
connectors are designed for solid wire only. Never use stranded-conductor wire with