Environmental Monitoring - Cisco 7000 Hardware Installation And Maintenance

Functional Overview

Environmental Monitoring

The environmental monitoring functions use the following levels of status conditions to monitor the
system. The processor uses the first four levels to monitor the temperature inside the interface
processor compartment, and the power supplies use the Normal and Critical levels to monitor DC
voltages. Table 1-6 lists temperature thresholds for the first four (processor-monitored) levels.
Table 1-7 lists the DC power thresholds for the Normal and Critical (power-supply-monitored)
levels.
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Table 1-6
Parameter
Inlet air
Airflow
1-62 Cisco 7000 Hardware Installation and Maintenance
Normal—All monitored parameters are within normal tolerances.
Warning—The system is approaching an out-of-tolerance condition. The system will continue to
operate, but operator monitoring or action is recommended to bring the system back to a normal
state.
Critical—An out-of-tolerance temperature or voltage condition exists. System may not continue
operation. If a voltage measurement reaches this level, the power supply can shut down the
system. Immediate operator action is required. If the system shuts down, the yellow DC Fail LED
on each power supply lights momentarily as the system ramps down. The +24V DC line remains
enabled to allow the blower to continue operation.
Processor shutdown—The processor has detected a temperature condition which could cause
physical damage to the system and has disabled all DC power except the blower (+24V line).
Immediate operator action is required. The present status of monitored parameters is logged in
NVRAM. The yellow DC Fail LED lights on all installed power supplies as the system ramps
down, then both the DC Fail and AC Power LEDs remain on after power shuts down. The DC
power remains off until the operator toggles the system power switch off and on again.
Power supply shutdown—The power supply has detected an out-of-tolerance voltage, current, or
temperature condition within the power supply and has shut down (or a shutdown is imminent).
The yellow Power Fail and green AC Power LEDs on the power supply stay on as the power
ramps down and, if a second power supply is still providing power, the LEDs remain on after
shutdown. When both power supplies shut down in a system with redundant power, all DC power,
including the blower, is disabled. The DC power remains off until the operator toggles the AC
power and corrects the problem that caused the shutdown (if any). This status condition is
typically due to one of the following:
— Loss of AC power (the operator turned off the system power, or the AC source failed)
— Power supply detected an overvoltage, overcurrent, undervoltage, or overtemperature
condition within the power supply
Processor-Monitored Temperature Thresholds
Warning Normal
< 10°C 10–39°C
< 10°C 10–60°C
Warning Critical Shutdown
39–46°C 46–64°C > 64°C
60–70°C 70–88°C > 88°C