Juniper PTX Series - Maintaining the PTX5000 Fan Trays

Action On a regular basis:
• Check the air filters for dust and debris. Replace the filter elements . The filter elements
degrade over time, so the filter elements in use, as well as spares, must be replaced
every 6 months.
• Use spare filter elements within 1 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 filters in place while the packet transport
switch is operating. The fans are very powerful, and could pull small bits of
wire or other materials into the packettransport switchthrough the unfiltered
air intake. This could damage the packet transport switch components.
Related
Documentation
PTX5000 Cooling System Description on page 18•
• Maintaining the PTX5000 Fan Trays on page 110
• Troubleshooting the PTX5000 Cooling System on page 122
Maintaining the PTX5000 Fan Trays
Purpose For optimum cooling, verify the condition of the fan trays.
Action On a regular basis:
• Check the fan tray LEDs on the craft interface. During normal operation, the LEDs are
lit green to indicate that the cooling system is functioning normally.
• Monitor the status of the fans. During normal operation, the fans in each fan tray are
functioning at less than full speed.
The fan trays each contain multiple fans that work in unison to cool the packet transport
switch 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 is triggered when a fan tray is removed.
To display the status of the fans, issue the show chassis environment command.
Related
Documentation
PTX5000 Cooling System Description on page 18•
• Maintaining the PTX5000 Air Filters on page 109
• Troubleshooting the PTX5000 Cooling System on page 122
Copyright © 2012, Juniper Networks, Inc.110
PTX5000 Packet Transport Switch Hardware Guide