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Chapter 2
Preparing for Installation
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Rack Installation Safety Guidelines
The Cisco NAC Appliance CAM/CAS can be mounted in most four-post telephone company
(telco-type), 19-inch equipment racks that comply with the Electronics Industries Association (EIA)
standard for equipment racks (EIA-310-D). The distance between the center lines of the mounting holes
on the two mounting posts must be 18.31 inches +/- 0.06 inch (46.50 cm +/- 0.15 cm). The
rack-mounting hardware included with the appliance is suitable for most 19-inch equipment racks or
telco-type frames.
Cisco strongly recommends using four-post racks whenever possible, but your rack must have at least
Note
two posts that provide mounting flanges for mounting an appliance.
Figure 2-1
Figure 2-1
1
Four-Post (Partially-Enclosed) Rack
Image "1" in
front and two more at the rear. The Cisco NAC Appliance CAM/CAS may be installed in this type of
enclosed rack, because the appliance only requires an unobstructed flow of cooling air into the front of
the chassis and pushed out of the rear to maintain acceptable operating temperatures for its internal
components.
Four-Post (Open) Rack
Image "2" in
two mounting posts at the back. The mounting posts in this type of rack are often adjustable so that you
can position the rack-mounted unit within the depth of the rack rather than flush-mount it with the front
of the rack.
OL-20326-01
Power Considerations, page 2-9
Method of Procedure, page 2-10
shows a couple of common examples of four-post equipment racks.
Four-Post Equipment Rack Types
Figure 2-1
shows a freestanding, partially-enclosed rack with two mounting posts in the
Figure 2-1
shows a freestanding, four-post open rack with two mounting posts in front and
2
Cisco NAC Appliance Hardware Installation Guide
Preparing Your Site for Installation
2-7
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