Juniper MX480, Hardware Manual

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Figure 91: Installing the Air Filter
See Also Preventing Electrostatic Discharge Damage to an MX480 Router on page 388
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MX480 Cooling System Description on page 41
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Troubleshooting the MX480 Cooling System on page 355
Maintaining the MX480 Fan Tray
Purpose For optimum cooling, verify the condition of the fans.
Action Monitor the status of the fans. A fan tray contains multiple fans that work in unison to
cool the router components. If one fan fails, the host subsystem adjusts the speed of
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the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails,
and a yellow alarm and red alarm is triggered when a fan tray is removed.
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To display the status of the cooling system, issue the show chassis environment
command. The output is similar to the following:
user@host> show chassis environment
Class Item Status Measurement
Temp PEM 0 OK 40 degrees C / 104 degrees F
PEM 1 Absent
PEM 2 Absent
PEM 3 OK 40 degrees C / 104 degrees F
Routing Engine 0 OK 39 degrees C / 102 degrees F
Routing Engine 1 OK 42 degrees C / 107 degrees F
CB 0 Intake OK 26 degrees C / 78 degrees F
CB 0 Exhaust A OK 27 degrees C / 80 degrees F
CB 0 Exhaust B OK 27 degrees C / 80 degrees F
CB 0 ACBC OK 26 degrees C / 78 degrees F
CB 0 SF A OK 37 degrees C / 98 degrees F
CB 0 SF B OK 35 degrees C / 95 degrees F
CB 1 Intake OK 27 degrees C / 80 degrees F
CB 1 Exhaust A OK 30 degrees C / 86 degrees F
Copyright © 2019, Juniper Networks, Inc. 236
MX480 Universal Routing Platform Hardware Guide