Figure 5-15 Dc Pems Installed Behind The Air Intake Plenum On Mgx 8850 - Cisco MGX MGX 8800 Hardware Installation Manual

Chapter 5 Installing the Cisco MGX Switch or Gateway
Note
Position the exhaust, which occupies 3 RUs of space, directly above the upper fan tray.
Step 2
Use four mounting screws and a Phillips-head screwdriver to bolt the exhaust plenum in the rack. See
Step 3
Figure 5-5
If you are installing the exhaust plenum in a 19-inch cabinet, attach the rear-mounting brackets to the
Step 4
rack, and use screws to secure the fan tray to the rear-mounting brackets.
Install the DC PEM(s)
Before performing any of the following procedures, ensure that power is removed from the DC
Warning
circuits. To ensure that all power is removed, locate the circuit breakers or fuses on the DC power
lines that service the DC circuits. Turn OFF the DC power line circuit breakers and remove the DC
power line fuses. Statement 322
Before working on a system that has an On/Off switch, turn OFF the power and unplug the power cord.
Warning
Statement 1
Never install an AC power module and a DC power module in the same chassis. Statement 264
Warning
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
Warning
disconnect the power at the circuit breaker on DC units. Statement 12
For a DC-powered system, install the DC PEMs at the back of the air intake plenum. Tighten the captive
screws to attach the DC PEM to the component.
If you install only one DC PEM, install it on the right, as viewed from the rear of the air intake plenum.
(See
Figure 5-15
Secondary
DC PEM
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Installing the MGX 8850 (PXM1E/PXM45) Switch, MGX 8850/B or MGX 8880 Media Gateway
If you are installing the exhaust plenum in a 19-inch cabinet, it is front-mounted in the rack with
support from rear brackets.
for the correct placement of the exhaust plenum.
Figure 5-15 for MGX 8850 and
DC PEMs Installed Behind the Air Intake Plenum on MGX 8850
Figure 5-16 for MGX 8880.)
Primary
DC PEM
Cisco MGX 8800/8900 Series Hardware Installation Guide
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