Additional Troubleshooting Reference Information
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
5-20
+3.3VDC and +5 VDC from the DC-DC converter, the +5.2VDC for the MBus
module, and the operating voltage for the fan trays. Each command also displays the
temperature measurements made by two sensors on each card (one for inlet air
temperature and one for the card’s hot-spot temperature), as well as a temperature
measurement made by a sensor in the power supply(ies).
If an environmental shutdown results from an out-of-tolerance power condition, the
OUTPUT FAIL LED on the power supply goes on before the system shuts do wn. In this
case, refer to the section entitled “Troubleshooting the Power Subsystem.”
—Although an overtemperature condition is unlikely at initial system startup, ensure
that heated exhaust air from other equipment in the immediate environment is not
entering the air filter assembly; in addition, ensure sufficient clearance — at least
12 inches (30.5 cm) — in the lower front and top rear of the chassis to enable
cooling air to freely enter and be expelled from the chassis.
—Check the condition of the air filter. If it appears dirty, remove the filter and clean
it, or replace it altogether.
There are no field-replaceable components in the fan trays. If a fan tray is faulty, you must
replace the entire unit.
If you are still unable to resolve a problem with the router’s cooling subsystem, contact a
Cisco service representative for assistance.
Additional Troubleshooting Reference Information
The following additional reference materials are available for troubleshooting your
Cisco12008 installation:
•The various configuration notes for the system’s major components
•Troubleshooting Internetworking Systems
•Debug Command Reference
•System Error Messages