Juniper Networks MX480 - Manual (Page 148)

• Inspect the air filter at the left rear of the router, replacing it every 6 months for optimum
cooling system performance. Do not run the router for more than a few minutes without
the air filter in place.
Related
Documentation
Maintaining the MX480 Air Filter on page 124 •
Maintaining the MX480 Cooling System Components
• Maintaining the MX480 Air Filter on page 124
• Maintaining the MX480 Fan Tray on page 124
Maintaining the MX480 Air Filter
Purpose For optimum cooling, verify the condition of the air filters.
Action Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a
negative effect on the ventilation of the chassis. The filter degrades over time. You
must replace the filter every 6 months. •
CAUTION: Always keep the air filter in place while the router is operating.
Because the fans are very powerful, they could pull small bits of wire or
other materials into the router through the unfiltered air intake. This could
damage the router components.
• Use spare filters within 1 year of manufacture. Check the date of manufacture printed
on the filter. Store spare air filters in a dark, cool, and dry place. Storing air filters at
higher temperatures, or where they can be exposed to ultraviolet (UV) radiation,
hydrocarbon emissions, or vapors from solvents, can significantly reduce their life.
Related
Documentation
Replacing the MX480 Air Filter on page 163 •
• Routine Maintenance Procedures for the MX480 Router on page 123
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 •
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.
• 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
Copyright © 2013, Juniper Networks, Inc. 124
MX480 3D Universal Edge Router Hardware Guide