Maintaining The T640 Fan Trays - Juniper T640 Hardware Manual

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Maintaining the T640 Fan Trays

Purpose
Action
Copyright © 2010, Juniper Networks, Inc.
T640 Cooling System Description on page 61
T640 Clearance Requirements for Airflow and Hardware Maintenance on page 68
Replacing a T640 Air Filter on page 191
For optimum cooling, verify the condition of the fans.
On a regular basis:
Monitor the status of the fans. The fan trays each contain 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 is triggered when a fan tray is removed.
To display the status of the fans, issue the
output is similar to the following:
user@host> show chassis environment
Fans Top Left Front fan
Top Left Middle fan
Top Left Rear fan
Top Right Front fan
Top Right Middle fan
Top Right Rear fan
Bottom Left Front fan
Bottom Left Middle fan
Bottom Left Rear fan
Bottom Right Front fan
Bottom Right Middle fan
Bottom Right Rear fan
Rear Tray Top fan
Rear Tray Second fan
Rear Tray Third fan
Rear Tray Fourth fan
Rear Tray Fifth fan
Rear Tray Sixth fan
Rear Tray Seventh fan
Chapter 15: Maintaining T640 Router Hardware Components
show chassis environment
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
command. The
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