Maintaining the Power Supplies

To maintain the power supplies, follow these guidelines:

• To check the status of the power supplies, issue the show chassis environment pem command. The output is similar to the following:
  
  

  user@host> show chassis environment pem

   PEM 0 status:   State                           Online   Temperature                     OK   DC output                       OK PEM 1 status:   State                           Online   Temperature                     OK   DC output                       OK 

• Make sure that the power and grounding cables are arranged so that they do not obstruct access to other services gateway components.
• Routinely check the status LEDs on the power supply faceplates and the craft interface to determine if the power supplies are functioning normally. For more information about the power supply LEDs, see Power Supply LEDs and AC Power Supply LEDs or DC Power Supply LEDs.
• Check the red and yellow alarm LEDs on the craft interface. 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 command:
  
  

  user@host> show chassis alarms

  For a list of possible alarm messages, see Chassis and Interface Alarm Messages.

• Periodically inspect the site to ensure that the grounding and power cables connected to the device are securely in place and that there is no moisture accumulating near the device. To review grounding and site wiring requirements for the device, see Preparing the Site for Services Gateway Installation.