Information Technology Reference
In-Depth Information
FIGURE 8.6
Patch panel marking.
TIA-568-C guidelines (Fig. 8.7). You will recall that the maximum length of hori-
zontal cabling is 90 m (295 ft). An additional length of up to 10 m (33 ft) for each
link is allowed for horizontal cross-connect, jumpers, patch cords, patch panels, and
user/equipment cords. That makes the recommended total length for all of the
wiring in a horizontal link (Channel) 100 m (328 ft).
This is the distance from the workstation, all the way to the final hub or equip-
ment connection in the wiring closet, including the user cords on each end. (The
actual connectors at each end are excluded in the channel measurements.)
The standard also recommends maximum lengths of cable in the work area
and wiring closet, which make up the 10-m (33-ft) allowance. For example, the total
Horizontal
patch or
cross-connect
User
cord
WAO
Horizontal
cable
Equipment
cord
Switch/hub
Jumper
5 m (16 ft)
(maximum)
90 m (295 ft)
(maximum)
5 m (16 ft)
(maximum)
FIGURE 8.7
User and equipment cord distances.
