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Rack-Mounting the MGX 8220 Units
Horizontal Positioning
MGX 8220 modules are designed to be mounted to two vertical rack-mounting rails. A front-mounting
rail is used as one mounting point using the flanges provided at the front of each MGX 8220 module.
A second rail, either at the rear of the rack or at an intermediate position, is used for the second
mounting point (mounting brackets are provided for attaching the module to the second rail). The
allowable positions for intermediate rails is shown in Figure 7-1.
Figure 7-1
Front rail
Vertical Positioning
The MGX 8220 units are mounted in a specific order from the bottom to the top.
The AC power module (if used) is mounted first, then the fan cooling assembly is mounted, then the
first shelf is mounted, and then the second shelf (if installed) is mounted.
If a third and fourth shelf is installed, a booster cooling assembly must be mounted immediately above
the second shelf and immediately below the third and fourth shelves. The plenum or spacer unit is
mounted last above the highest shelf. If a cable management kit is used in a two shelf or four shelf rack,
the top unit must be a plenum because cable management hardware is not supported by the spacer unit.
When each module is installed, there should be approximately 1/32 of an inch vertical space between
adjacent modules. This can be achieved by ensuring that each module is installed at the center of each
standard rack increment. This space is important because it allows cards, fan, and power entry modules
to be removed without interference. Hardware is available in the installation kits for this purpose. (See
Figure 7-4.)
Racks with one and two shelves are shown in Figure 7-2. Racks with three and four shelves are shown
in Figure 7-3.
The MGX 8220 shelf and cooling assembly rely on their contact with the rack for grounding. Therefore,
the rack should be properly connected to earth ground.
Cisco MGX 8220 Installation and Configuration
7-6
Mounting Rail Positions
MGX 8220 Depth 21.39"
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y
10.0"
5.0"
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y
y
y
y
y
Allowable intermediate
rail positions
19.86"
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y
y
Module
y
Rear rail
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
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