Datasheet

CFEB Intake OK 27 degrees C / 80 degrees F
CFEB Exhaust OK 33 degrees C / 91 degrees F
Routing Engine OK 26 degrees C / 78 degrees F
Fans Left Fan Tray Present
Left Tray front fan OK Spinning at normal speed
Left Tray second fan OK Spinning at normal speed
Left Tray third fan OK Spinning at normal speed
Left Tray fourth fan OK Spinning at normal speed
For further description of the output from the command, see the Junos OS System Basics
and Services Command Reference.
• Check the red and yellow alarm LEDs on the FIC. Power supply failure or removal
triggers an alarm that causes one or both of the LEDs to light. You can display the
associated error messages by issuing the following CLI command:
user@host> show chassis alarms
For a list of possible alarm messages, see “Hardware and Interface Alarm Messages”
on page 80.
• Verify that the power source has the proper current rating and that each power supply
is connected to a separate power source.
• Verify that the cable or cord connecting the power supply to the external power source
is securely in place and that there is no moisture accumulating near the router.
• Verify that the cable or cord from the power source to the router is not damaged. If the
insulation is cracked or broken, replace the cable or cord immediately.
• Verify that the power cables or cord do not touch or obstruct access to other router
components, and that they do not drape where people could trip on them.
• Verify that the air flow in and out of cooling system components is not obstructed.
Related
Documentation
M7i Power System Description on page 23•
• M7i Router Power Requirements on page 167
• Troubleshooting the M7i Power System When the LED on One M7i Power Supply Is Off
on page 85
• Troubleshooting the M7i Power System When the LEDs on All M7i Power Supplies Are
Blinking or Off on page 85
Maintaining the M7i Cooling System
Purpose For optimum cooling, verify the condition of the fans.
Action The router has a single fan tray that installs into the back of the chassis, as shown in
Figure 2 on page 6.
To check the status of the fans in the fan tray, issue the show chassis environment
command. The output includes an entry for each fan in the fan tray:
user@host> show chassis environment
Class Item Status Measurement
Power Power Supply 0 OK
77Copyright © 2012, Juniper Networks, Inc.
Chapter 13: Maintaining M7i Router Hardware Components