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Troubleshooting the T1600 Power System

To verify that a power supply is functioning normally:

  • Check the LEDs on each 3-input 240-A DC or 4-input 240-A DC power supply faceplate.

    • The blue DC OK LEDs light the power supplies are functioning normally.
    • Each green INPUT PRESENT LED lights when the input is receiving source DC power.
    • Each CB ON LED on the power supply lights when the circuit breaker is on.
    • The blue DC OK LED blinks when the power supply detects a fault (the power supply fails, does not have sufficient airflow, is going through a startup test, or is not properly inserted).
    • The yellow OVER TEMP LED lights when the power supply is not receiving enough airflow to maintain proper temperature.
  • Check the display on the craft interface. The JUNOS software constantly updates the screen with status information for each component. For more information about the display, see T1600 Craft Interface Description.

    Note: On the display and in the CLI, the power supplies are referred to as PEM0 and PEM1, from top to bottom.

If a power supply is not functioning normally, perform the following steps to diagnose and correct the problem:

  • If all power supplies have failed, the system temperature might have exceeded the threshold, causing the system to shut down.
  • If the DC OK power supply LED is blinking, check the red alarm LED on the craft interface.
  • If a red alarm condition occurs, check the display on the craft interface to determine the source of the problem.

    Note: If the system temperature exceeds the threshold, the JUNOS software shuts down all power supplies so that no status is displayed.

    The JUNOS software also can shut down one of the power supplies for other reasons. In that case, the remaining power supply assumes the load, and you can still view the system status through the CLI or display.

  • If the DC OK power supply LED is off and no red alarm condition exists, check that the circuit breakers are switched to the ON position (|).
  • If the DC OK LED on one or both of the power supplies is not lit, check the power supply fans to see if they are operating.
  • Verify that the source circuit breaker has the proper current rating. Each input on each power supply must be connected to a separate power source.
  • Verify that the power cables from the power source to the router are not damaged. If the insulation is cracked or broken, immediately replace the cable.
  • Connect the power supply to a different power source with a new power cable. If the power supply DC OK LED still does not light, the power supply is the source of the problem. Replace the power supply with a spare, as described in Replacing T1600 Power System Components .
  • If the DC OK LED on the installed spare does not light, the replaced power supply might be faulty. To return it for replacement, see Contacting Customer Support.
  • If the OVER TEMP LED on one of the power supplies lights, check the fans and air filters to be sure they are functioning and providing sufficient airflow through the chassis.
  • If you cannot determine the cause of the problem or need additional assistance, see Contacting Customer Support.

Published: 2009-09-30

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