Rear Tray Seventh fan OK 5190 Spinning at normal speed
Rear Tray Bottom fan OK 5190 Spinning at normal speed
For the quiet fan trays, the output for the show chassis fan command is similar to the
following:
user@host> show chassis fan
Item Status RPM Measurement
Top Left Front fan OK 2220 Spinning at normal speed
Top Left Rear fan OK 2190 Spinning at normal speed
Top Right Front fan OK 2220 Spinning at normal speed
Top Right Rear fan OK 2250 Spinning at normal speed
Bottom Left Front fan OK 2220 Spinning at normal speed
Bottom Left Rear fan OK 2220 Spinning at normal speed
Bottom Right Front fan OK 2250 Spinning at normal speed
Bottom Right Rear fan OK 2220 Spinning at normal speed
Rear Tray Top fan OK 5190 Spinning at normal speed
Rear Tray Second fan OK 5190 Spinning at normal speed
Rear Tray Third fan OK 5190 Spinning at normal speed
Rear Tray Fourth fan OK 5190 Spinning at normal speed
Rear Tray Fifth fan OK 5190 Spinning at normal speed
Rear Tray Sixth fan OK 5190 Spinning at normal speed
Rear Tray Seventh fan OK 5190 Spinning at normal speed
Rear Tray Bottom fan OK 5190 Spinning at normal speed
Related
Documentation
T640 Cooling System Description on page 31•
• Troubleshooting the T640 Cooling System on page 469
Maintaining the T640 Host Subsystem
Purpose For optimum router performance, verify the condition of the host subsystem. The host
subsystem comprises a Routing Engine and up to two adjacent control boards functioning
together.
Action On a regular basis:
• Check the host subsystem LEDs (HOST0 and HOST1) on the craft interface. If the red
HOST0 FAIL or HOST1 FAIL LED is lit, look at the LCD to get more information about
the cause of the problem. For more information about the LEDs and the display, see
“T640 Craft Interface Description” on page 22.
During normal operations:
• The green host subsystem OK LED on the craft interface is lit.
• The red host subsystem FAIL LED on the craft interface is not lit.
• Check the LCD on the craft interface to view information about the status of the Routing
Engines and control boards.
447Copyright © 2017, Juniper Networks, Inc.
Chapter 32: Maintaining Components
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