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Environmental Monitoring Functions
Catalyst 8540 Chassis Installation Guide
2-2
Warning This unit is intended for installation in restricted access areas. A
restricted access area is where access can only be gained by service personnel
through the use of a special tool, lock and key, or other means of security, and is
controlled by the authority responsible for the location.
Environmental Monitoring Functions
You can maintain normal system operation by identifying and resolving adverse conditions
before the system fails by using environmental monitoring and reporting functions.
Environmental monitoring functions constantly monitor the internal air temperature of the
chassis. Each power supply monitors its own voltage and shuts down if it detects a critical
condition within the power supply. The reporting functions retrieve and display the present
values of measured parameters. If any of the monitored parameters exceed defined
thresholds, the reporting functions display alarms on the console.
The environmental monitoring functions use two levels of status conditions to monitor the
system: normal and alarm. The processor monitors the temperature inside the module
compartment, and the power supplies use the normal and alarm levels to monitor voltages.
Table 2-1 lists temperature thresholds for the processor-monitored levels:
• Normal—All monitored parameters are within normal tolerances.
• Alarm—An out-of-tolerance temperature or voltage condition exists. The system might
not continue operation. If a voltage measurement reaches this level, the power supply
can shut down the system. Immediate action is required.
Table 2-1 Processor-Monitored Temperature Thresholds
The power supply monitors its own internal temperature and voltages. The power supply is
either within tolerance (normal) or out of tolerance (alarm). If an internal power supply
temperature or voltage reaches the alarm level, the output fail LED may be unreliable and
the power supply can shut down the system.
Parameter Normal Alarm
Temperature 0–55°C> 55°C