Cisco Systems 7500 Series manual Airflow Temperature Measured

Chapter 2 Preparing for Installation

Environmental Monitoring and Reporting Overview for the Cisco 7500 Series

+24 volts measured at 23.70(V)
Airflow	temperature	measured	at 35(C)
Inlet	temperature	measured	at	26(C)

When the system power is on, all six fans in the fan array must be operational. If the system detects a failed or failing fan, it will display a warning message on the console screen. If the condition is not corrected within 2 minutes, the entire system will shut down to avoid an overtemperature condition and possible damage.

The system uses a Hall Effect signal to monitor the six fans in the array. The current to the fans and the magnetic field generated by the fans’ rotation generate a voltage, which the system monitors to determine if all of the fans are operating. If the monitored voltage signal drops below a specified value, the system assumes a fan failure and initiates a system shutdown.

In the following example, the system has detected an out-of-tolerance fan, which it interprets as a fan failure. The failure message is displayed for 2 minutes before the system shuts down.

%ENVM-2-FAN: Fan array has failed, shutdown in 2 minutes

If the system does shut down because of a fan failure, the system will display the following message on the console screen and in the environment display and in the show environment command display when the system restarts:

Queued messages:

%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown

Cisco 7507 and Cisco 7507-MX Environmental show Command Examples

In the Cisco 7507 and Cisco 7507-MX, the show environment command display reports the current environmental status of the system. The report displays parameters that are out of the normal values. No parameters are displayed if the system status is normal. The example that follows shows the display for a system in which all monitored parameters are within normal status range.

Router# show env

All measured values are normal

If the environmental status is not normal, the system reports the worst-case status level in the last line of the display.

In the Cisco 7507 and Cisco 7507-MX, the show environment last command retrieves and displays the NVRAM log showing the reason for the last shutdown (if the shutdown was related to voltage or temperature) and the environmental status at that time. Air temperature is measured and displayed, and the DC voltages supplied by the power supply are also displayed.

Following is sample output of the show env last command:

Router# show env last

RSP(2) Inlet		previously measured at 27C/80F
RSP(2) Hotpoint		previously measured at 38C/100F
RSP(2) Exhaust		previously measured at 31C/87F
+12	Voltage	previously measured at 12.17
+5 Voltage		previously measured at 5.19
-12	Voltage	previously measured at -12.17
+24	Voltage	previously measured at 23.40

In the Cisco 7507 and Cisco 7507-MX, the show environment table command displays the temperature and voltage thresholds for each of the three RSP temperature sensors for each monitored status level: low critical, low warning, high warning, and high critical, which are the same as those listed in Table 2-4

	Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0		2-29