20
Rack Installation Guide
Installation Tasks
Installing a two-post rack kit includes performing the following tasks in order:
1
Marking the rack
•
Universal-hole spacing rack
•
Wide-hole spacing rack
2
Installing the mounting rails in the rack
•
Center-mount installation
•
Flush-mount installation
3
Installing the system in the rack
4
Routing cables
Marking the Rack
You must allow 1 U (44 mm, or 1.75 inch) of vertical space for each system that you install
in the two-post rack.
Universal-Hole Spacing Racks
Racks with universal-hole spacing have an alternating pattern of three holes per rack unit with
center-to-center hole spacing (beginning at the top hole of a 1-U space) of 15.9 mm, 15.9 mm,
and 12.7 mm (0.625 inch, 0.625 inch, and 0.5 inch) for the front and back vertical column of holes
(see Figure 1-11).
Figure 1-11.
Two-Post, Open-Frame Relay Rack Universal-Hole Spacing
12.7 mm (0.5 inch)
15.9 mm (0.625 inch)
15.9 mm (0.625 inch)
1 U (44 mm or 1.75 inches)
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