Juniper Power Supply Commands

Most Juniper equipment supports the ‘show chassis power’ command to give detailed input about the power supplies. The MX204 uses ‘show chassis environment pem’ instead, where ‘pem’ is an acryonym for ‘power entry module’.

In this example, PEM 0 either has failed, or is not installed. PEM 1 is operating normally.

james@mx204> show chassis environment pem
PEM 0 status:
  State                      Empty
  Health check Information:
      Status:                    Unsupported
PEM 1 status:
  State                      Online
  Airflow                    Front to Back
  Temp Sensor 0                           OK   31 degrees C / 87 degrees F

  Temp Sensor 1                           OK   33 degrees C / 91 degrees F 

  Firmware version           00.05
  Fan Sensor                 6030 RPM
  DC Output           Voltage(V) Current(A)  Power(W)  Load(%)
                        11.00       8             88       13
  Health check Information:
      Status:                    Unsupported

In this example, PEM 1 is installed but not connected to input power.

root> show chassis environment pem
PEM 0 status:
  State                      Online
  Airflow                    Front to Back
  Temp Sensor 0                           OK   28 degrees C / 82 degrees F

  Temp Sensor 1                           OK   28 degrees C / 82 degrees F

  Firmware version           00.06
  Fan Sensor                 6000 RPM
  DC Output           Voltage(V) Current(A)  Power(W)  Load(%)
                         11.00       14            154      23
  Health check Information:
      Status:                    Unsupported
PEM 1 status:
  State                      Present
  Health check Information:
      Status:                    Unsupported