Juniper MX960 Hardware Manual page 635

For optimum router performance, verify the condition of the power supplies.
Action
On a regular basis:
Check the status of the power supplies by issuing the show chassis environment pem command. The
output is similar to the following:
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC output
PEM 1 status:
State
Temperature
DC output
Make sure that the power and grounding cables are arranged so that they do not obstruct access to
other router components.
Routinely check the status LEDs on the power supply faceplates and the craft interface to determine if
the power supplies are functioning normally.
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
Periodically inspect the site to ensure that the grounding and power cables connected to the router are
securely in place and that there is no moisture accumulating near the router.
RELATED DOCUMENTATION
MX960 Power Supply LEDs on the Craft Interface | 20
MX960 AC Power Supply Description | 130
MX960 DC Power Supply | 140
Troubleshooting Resources for MX960 Routers | 653
MX960 Site Preparation Checklist | 181
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