Step 4: Check the Router Cooling System

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Step 4: Check the Router Cooling System
The power supplies require an unobstructed airflow.

If the NO AIRFLOW LED on one of the power supplies lights, check that the airflow around the power supply is sufficient.

Action

To check the airflow, use the following CLI command:
user@host> show chassis environment 
Sample Output
user@m40-host> show chassis environment 
Class Item                   Status     Measurement
Power Power Supply A         OK
      Power Supply B         Absent
[...Output truncated...]
Fans  Top Impeller           OK         Spinning at normal speed
      Bottom Impeller        OK         Spinning at normal speed
      Rear Fan 1             OK         Spinning at normal speed
      Rear Fan 2             OK         Spinning at normal speed
      Rear Fan 3             OK         Spinning at normal speed
[...Output truncated...]
What It Means

The command output displays the power supply status and the cooling system status. When monitoring the power supplies, look at both the power supply status and the cooling system status. If the cooling system temperature is above a certain level, the power supplies are automatically cut off.

Alternative Action

To check the power supply temperature on M40e and M160 routers, use the following CLI command:
user@host> show chassis environment pem 
user@host> show chassis environment pem
PEM 0 status:
  State                       Online
  Temperature                 OK
  DC input                    OK
  DC output                   OK
  Load                        Less than 20 percent
  Voltage:
    48.0 V input        69028 mV
    48.0 V fan supply   48839 mV
    5.0 V bias           5013 mV
    8.0 V bias           8253 mV
PEM 1 status:
  State                       Online
  Temperature                 OK
  DC input                    OK
  DC output                   OK
  Load                        Less than 20 percent
  Voltage:
    48.0 V input        69307 mV
    48.0 V fan supply   49170 mV
    5.0 V bias           4991 mV
    8.0 V bias           8263 mV
The command output displays the temperature of the air flowing past the power supplies (PEMs). The status is either OK or Failed.

To check the status of a specific power supply, indicate the slot number. For example, type show chassis environment pem slot, where slot can be either 0 or 1.

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