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Installing Cisco Intrusion Prevention System Appliances and Modules 5.0
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Chapter 4 Installing IDS-4235 and IDS-4250
Installing the Accessories
Marking the Rack
You must allow 1 RU (44 mm or 1.75 inches) of vertical space for each appliance you install in the
two-post rack.
To mark the rack, follow these steps:
Step 1
Place a mark on the rack’s front vertical rails where you want to locate the bottom of the appliance that
you are installing in the two-post rack.
Note
The bottom of each 1-RU space is at the middle of the narrowest metal area between holes.
Step 2
Place a mark 44 mm (1.75 inches) above the original mark you made.
Note
Each 1 RU (44 mm, or 1.75 inches) of vertical space on a rack with universal-hole spacing has
three holes with center-to-center spacing between the holes (beginning at the top of a 1-RU
space) of 15.9 mm, 15.9 mm, and 12.7 mm (0.625 inches, 0.625 inches, and 0.5 inches).
Installing the Slide Assemblies in the Rack
You can install the slide assemblies in a two-post, open-frame relay rack having either universal-hole
spacing or wide-hole spacing. You can install the 1-RU slide assemblies in either a flush-mount or
center-mount configuration.
This section contains these topics:
•
Center-Mount Installation, page 4-28
•
Flush-Mount Installation, page 4-29
Center-Mount Installation
The two-post rack kit is shipped with brackets configured for center-mount installation.
To install the center-mount brackets, follow these steps:
Step 1
Locate the right slide assembly and push the back bracket toward the back of the slide assembly (see
Figure 4-12 on page 4-29
).
Step 2
Position the right slide assembly in the two-post rack at the location you marked, push the back bracket
forward against the vertical two-post rack, and secure the front and rear center-mounting brackets to the
rack with two 12-24 x 0.5-inch pan-head Phillips screws (
Figure 4-12 on page 4-29
).
Step 3
Repeat Steps 1 and 2 to install the left side assembly in the rack.