Users Guide

Recognize an Overtemperature Condition
An overtemperature condition occurs, for one of two reasons: the card genuinely is too hot or a sensor has
malfunctioned.
Inspect cards adjacent to the one reporting the condition to discover the cause.
• If directly adjacent cards are not normal temperature, suspect a genuine overheating condition.
• If directly adjacent cards are normal temperature, suspect a faulty sensor.
When the system detects a genuine over-temperature condition, it powers off the card. To recognize this
condition, look for the following system messages:
CHMGR-2-MAJOR_TEMP: Major alarm: chassis temperature high (temperature reaches or
exceeds threshold of
[value]C)
CHMGR-2-TEMP_SHUTDOWN_WARN: WARNING! temperature is [value]C; approaching shutdown
threshold of [value]C
To view the programmed alarm thresholds levels, including the shutdown value, use the show alarms
threshold command.
Example of the show alarms threshold Command
Dell#show alarms threshold
-- Temperature Limits (deg C) --
---------------------------------------------------------------------------
Minor Minor Off Major Major Off Shutdown
Unit0 57 56 62 61 85
Dell#
Troubleshoot an Over-temperature Condition
To troubleshoot an over-temperature condition, use the following information.
1 Use the show environment commands to monitor the temperature levels.
2 Check air flow through the system. Ensure that the air ducts are clean and that all fans are working
correctly.
3 After the software has determined that the temperature levels are within normal limits, you can re-power
the card safely. To bring back the line card online, use the power-on command in EXEC mode.
In addition, Dell Networking requires that you install blanks in all empty slots to control airflow for adequate
system cooling.
Recognize an Under-Voltage Condition
If the system detects an under-voltage condition, it sends an alarm.
To recognize this condition, look for the following system message: %CHMGR-1-CARD_SHUTDOWN: Major
alarm: Line card 2 down - auto-shutdown due to under voltage.
S5000 Debugging and Diagnostics 1239