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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 5 Installing the Cisco MGX Switch or Gateway
Installing the MGX 8850 (PXM1E/PXM45) Switch, MGX 8850/B or MGX 8880 Media Gateway
Install the Air Intake Plenum
Complete the following steps to install the air intake plenum.
Tip If a component requires more than two screws for installation in the rack or cabinet, install the two
bottom screws first.
Step 1 If you are installing the system in a 19-inch or 23-inch rack, place the air intake plenum on a flat and
stable surface (for example, a table top). Use mounting screws and a Phillips-head screwdriver to attach
the mid-mounting brackets to the air intake plenum. You need a mounting kit to accommodate a 23-inch
rack (Cisco Part Number MGX-MNT23).
Note If you are installing the air intake plenum in a 19-inch cabinet, it is front-mounted in the rack
with support from rear brackets.
Step 2 Position the air intake plenum, which occupies 3 RUs of space, either at the bottom of the configuration
or rack (for a DC-powered system) or directly above the AC power supply tray (for an AC-powered
system).
Step 3 Use four mounting screws and a Phillips-head screwdriver to bolt the air intake plenum in the rack. See
Figure 5-5 for the correct placement of the air intake plenum.
Step 4 If you are installing the air intake plenum in a 19-inch cabinet, attach the rear-mounting brackets to the
rack and use screws to secure the air intake plenum to the rear-mounting brackets.
Install the Lower Fan Tray
Complete the following steps to install the lower fan tray in an MGX 8850 switch.
Note Skip this section if you are installing an MGX 8880 gateway.
Tip If a component requires more than two screws for installation in the rack or cabinet, install the two
bottom screws first.
Step 1 If you are installing the system in a 19-inch or 23-inch rack, place the lower fan tray on a flat and stable
surface (for example, a table top). Use mounting screws and a Phillips-head screwdriver to attach the
mid-mounting brackets to the lower fan tray. You need a mounting kit to accommodate a 23-inch rack
(Cisco Part Number MGX-MNT23).
Note If you are installing the fan tray in a 19-inch cabinet, it is front-mounted in the rack with support
from rear brackets.
Step 2 Position the lower fan tray, which occupies 1 RU of space, directly above the air intake plenum.