Juniper MX240 Hardware Manual page 163

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Copyright © 2013, Juniper Networks, Inc.
On a regular basis:
Check the status of the power supplies by issuing the
command. The output is similar to the following:
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC output
PEM 2 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.
Power Supply LEDs on the MX240 Craft Interface on page 40
MX240 AC Power Supply Description on page 43
MX240 DC Power Supply Description on page 45
MX240 Site Preparation Checklist on page 55
Troubleshooting Resources for MX240 Routers on page 141
Chapter 12: Maintaining MX240 Router Hardware Components
show chassis environment pem
Online
OK
OK
Online
OK
OK
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