• Supported Platforms
• M7i Routers

• Related Topics
• M7i Power System Description
• M7i Router Power Requirements
• Troubleshooting the M7i Power System When the LED on One M7i Power Supply Is Off
• Troubleshooting the M7i Power System When the LEDs on All M7i Power Supplies Are Blinking or Off

Maintaining the M7i Power Supplies

Purpose

For optimum router performance, verify the condition of the power supplies.

Action

• Check that the green OUTPUT OK LED is lit on the faceplate of both power supplies. For more information about the LED, see M7i Power Supply LEDs.
• Issue the following CLI command to check the status of the power supplies. As shown in the sample output, the value OK in the Status column indicates that the power supply is operating normally:
  
  

  user@host> show chassis environment

  Class Item                   Status     Measurement
  Power Power Supply 0         OK        
        Power Supply 1         OK        
  Temp  Intake                 OK         24 degrees C / 75 degrees F
        PICs                   OK         27 degrees C / 80 degrees F
        Power Supplies         OK         27 degrees C / 80 degrees F
        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 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 Overview of Troubleshooting Resources for the M7i Router.

• 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.