Troubleshooting The T4000 Power System - Juniper T4000 Hardware Manual

T4000 Router Hardware Guide
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Troubleshooting the T4000 Power System

Problem
Solution
204
PMB 3.3v
Bus Revision
T4000 Craft Interface LEDs on page 25
T4000 FPC Description on page 30
Maintaining T4000 FPCs on page 184
Replacing a T4000 FPC on page 242
The following alarms, LEDs, and other conditions indicate a problem with the power
system:
If all power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down.
Table 36 on page 206 lists alarms for the power system, including the solution.
Table 37 on page 207 lists abnormal LED states for the power supplies, including the
solution.
Check the display on the craft interface to determine the source of a yellow or red
1.
alarm (see Table 36 on page
information for each component.
NOTE: On the display and in the CLI, the power supplies are referred to
as PEM0 and
If the system temperature exceeds the threshold, Junos OS shuts down
all power supplies so that no status is displayed.
Junos OS also can shut down one of the power supplies for other reasons.
In that case, the remaining power supply assumes the load, and you can
still view the system status through the CLI or display.
Issue the
show chassis alarms
2.
Table 36 on page 206.
Check the LEDs on each six-input DC power supply faceplate. See
3.
Use the
show chassis environment pem
4.
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC Input:
INPUT 0
INPUT 1
3300 mV
80
206). Junos OS constantly updates the screen with status
PEM1 , from top to bottom.
command to check for power system alarms. See
command.
Online
34 degrees C / 93 degrees F
OK
Voltage(V) Current(A)
53.500 7.437
53.750 10.812
Table 37 on page
Power(W) Load(%)
397 52
581 77
Copyright © 2013, Juniper Networks, Inc.
207.