Juniper M40E Hardware Manual page 171

Copyright © 2010, Juniper Networks, Inc.
If these LEDs are blinking or other LEDs are lit, there could be an error condition. For a
summary of LED states, see "M40e Power System Description" on page 42.
Issue the following CLI command to check the status of the power supplies. The
following example specifies a slot number (
sample output, the value Online
is operating normally:
user@host> show chassis environment pem 0
PEM 0 status:
State
Temperature
DC input
DC Output
Load
Voltage:
48.0 V input
48.0 V fan supply
5.0 V bias
8.0 V bias
NOTE: The messages in the craft interface LCD and the output from CLI
commands refer to the power supply on the right as
show
power supply on the left as
For further description of the output from the command, see the Junos OS System
Basics and Services Command Reference.
Check the red and yellow alarm LEDs and the LCD on the craft interface. Power supply
failure or removal triggers an alarm that causes one or both of the LEDs to light and
an error message to appear on the LCD. You can display the associated error messages
by issuing the CLI command:
user@host> show chassis alarms
For a list of possible alarm messages, see "M40e Chassis and Interface Alarm Messages"
on page 147.
Verify that the power source has the proper current rating and that each power supply
is connected to a separate power source.
Verify that the cable or cord connecting the power supply to the external power source
is securely in place and that there is no moisture accumulating near the router.
Verify that the cable or cord from the power source to the router is not damaged. If the
insulation is cracked or broken, replace the cable or cord immediately.
Verify that the power cables or cord do not touch or obstruct access to other router
components, and that they do not drape where people could trip on them.
Verify that the air flow in and out of cooling system components is not obstructed.
Chapter 14: Maintaining M40e Router Hardware Components
), which is optional. As shown in the
0
in the State column indicates that the power supply
Online
OK
OK
OK
Less than 40 percent
55059 mV
50181 mV
5032 mV
8224 mV
.
PEM 1
and the
PEM 0
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