Information Technology Reference
In-Depth Information
the trained one), Category 5e and 6 cable and components look identical, but vary
widely in performance.
In the horizontal wiring structure (Fig 1.4), the station cable is terminated in
the area of each user workstation with an appropriate jack. The jack is typically an
8-pin modular female connector in a flush-mount wall plate that mounts in a sin-
gle-gang utility outlet box or metal attachment ring secured in a hollow Sheetrock
drywall. The 8-pin modular jack is sometimes referred to as an “RJ-45,” because
the connector/jack components are the same. However, RJ-45 actually applies to a
special purpose jack configuration that is not used in LAN or standard telephone
wiring. Several types of 8-pin jacks are available, and may be single (simplex) jacks,
dual (duplex) jacks, or modular snap-in jacks of up to 6 jacks per plate. Solid walls,
plaster walls, or hard-to-reach locations may use a surface mounted jack enclosure
(such as a “biscuit block,” or a flush-mount jack in a surface mount box) and
appropriate surface raceway to reach the user outlet location.
Modular furniture requires special consideration, because the workstation
cable may need to be dropped from the ceiling or run from an adjacent wall into
wire channels within the modular furniture units. Some modular furniture provides
Wiring closet
Work area
Horizontal cable
Cross-connect or patch panels
Cross-connect
jumper or
patch cord
Optional transition
Work area
telecommunications
outlet
Secondary punchdown
block or patch panel
(for equipment connection)
Initial termination
(punchdown block
or patch panel)
FIGURE 1.4
The horizontal wiring includes a telecommunications outlet, an optional transition, the horizon-
tal cable, and alternatively a punchdown block and cross-connect wire, or a patch panel and
patch cord.
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