Information Technology Reference
In-Depth Information
FIGURE 7.3
The station wires are inserted into the 110 wiring block and trimmed by using a 788-type
impact tool. Cross-connect wires are punched down using a 110 blade (see Fig. 7.4).
(Courtesy of The Siemon Company.)
these connectors. The incoming station wires are inserted and trimmed using a 788-
type impact tool, shown in Fig. 7.3.
This tool can insert and trim up to five pairs (10 wires) at a time on the wiring
block. It also seats the 110C connecting block onto a wiring block position. Cross-
connect wires are terminated and trimmed one at a time with a punchdown tool that
has a 110-type blade.
A 110-block system is used to terminate multipair station cables and allow the
cross-connection to other punchdown locations. A typical LAN installation might
have an appropriate number of wall-mounted or rack-mounted 110 blocks with
cross-connect jumpers to a patch panel.
Distribution frame assemblies are available that have preterminated 25-pair
multiconductor cables connected to the back positions of the connecting blocks. The
multiconductor cables terminate in 50-pin telco connectors that may provide mass
connections to hub, telephone, or other equipment.
As stated before, each horizontal strip of the wiring block unit contains posi-
tions for 50 wires, or 25 pairs. This strip, in many ways, corresponds one side of the
66 block. Using the same math we did for 66 blocks, the 110 strip can accommo-
date six individual 4-pair station cables (or eight each 3-pair cables, or 12 each 2-
pair cables). It can also terminate one 25-pair cable. As with the other type of block,
