Maintaining The M120 Air Filter; Maintaining The M120 Fan Trays - Juniper M120 Hardware Manual

M120 Multiservice Edge Router Hardware Guide
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Maintaining the M120 Air Filter

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Maintaining the M120 Fan Trays

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Inspect the installation site for moisture, loose wires or cables, and excessive dust.
Make sure that airflow is unobstructed around the router and into the air intake vents.
Check the status-reporting devices on the craft interface—System alarms and LEDs.
Inspect the air filter at the bottom front of the router. Replace 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. For maintenance instructions, see "Maintaining
the M120 Air Filter" on page 102.
M120 Router Chassis Description on page 6
M120 Clearance Requirements for Airflow and Hardware Maintenance on page 41
For optimum cooling, verify the condition of the air filters.
A dirty air filter restricts airflow in the unit, producing a negative effect on the ventilation
of the chassis. The filter elements degrade over time, so the filter elements in use,
should be replaced every 6 months. For procedures to replace the air filter, see
"Replacing an M120 Air Filter" on page 138.
Spare filter elements should be used within one year of manufacture. Check the date
of manufacture printed on the filter. Store spare filter elements in a dark, cool, and dry
place. Storing the filter elements at higher temperatures, or where they can be exposed
to ultraviolet (UV) radiation, hydrocarbon emissions, or vapors from solvents, can
significantly reduce their life.
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.
M120 Cooling System Description on page 32
Replacing an M120 Air Filter on page 138
Troubleshooting the M120 Cooling System on page 120
For optimum cooling, verify the condition of the fans.
Monitor the status of the fans. Each fan tray contains multiple fans that work in unison
to cool the router components. If one fan fails, the host subsystem adjusts the speed
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