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    Maintaining the MX104 Power System

    Purpose

    For optimum performance, verify the condition of the power supplies and grounding.

    Action

    On a regular basis:

    • Inspect the site to ensure that the grounding and power cables connected to the router are securely in place and that no moisture is accumulating near the router. To review grounding and site wiring requirements for the packet transport router, see MX104 Router Grounding Specifications.
    • Check the status of the power supplies by issuing the show chassis environment pem command.
      user@host> show chassis environment pem
      PEM 0 status:
        State                      Online
        Temperature                OK
        DC Input:                  OK
        DC Output:                 OK
        Voltage:
          12.0 V output            12351 mV
          3.3 V output              3343 mV
      PEM 1 status:
        State                      Present
      
    • Make sure that the DC power cables or AC power cords are arranged so that they do not obstruct access to other packet transport router components.
    • Check the status LEDs on the PSM faceplates to verify that the power supplies are functioning normally. During normal operation, the PS STATUS LED lights green to indicate that the power supply is functioning normally.

      For more information about the power supply LEDs, see MX104 Power Overview.

    • Check the red and yellow alarm LEDs on the front panel. 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
    • The power supplies require an unobstructed airflow at both the front and rear of the chassis. Check the site to ensure that both the air intake at the side of the chassis and the exhaust from the power supplies are unobstructed.
     

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    Published: 2014-02-13