Juniper Networks Hardware Manual page 144

M120 Multiservice Edge Router Hardware Guide
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Documentation
116
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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 and the
OK
the craft interface. If these output status LEDs are lit, the power supplies are functioning
normally. For more information about the power supply LEDs, see "M120 AC Power
Supply LEDs" on page 30 and "M120 DC Power Supply LEDs" on page 32.
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 CLI command:
user@host> show chassis alarms
For a list of possible alarm messages, see "Troubleshooting Using the Chassis and
Interface Alarm Messages" on page 118.
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. To review grounding and site wiring requirements for the router, see"DC Power
Electrical Safety Guidelines for the M120" on page 217 and "Site Electrical Wiring
Guidelines for M Series, MX Series, and T Series Routers" on page 237.
M120 Power Supplies Description on page 29
Replacing an M120 AC Power Supply on page 173
Replacing an M120 DC Power Supply on page 177
Troubleshooting the M120 Power System on page 124
Online
OK
OK
Online
OK
OK
LEDs on the power supply faceplates and
STATUS OK
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