Cisco Systems CISCO7201 Environmental Monitoring, Parameter High Warning High Critical Shutdown

Chapter 3 Starting and Configuring the Router

Functional Overview

Environmental Monitoring

The environmental monitoring functions use two sensors, Sensor 1 (U12) on the underneath front edge of the system board, and Sensor 2 (U20), near the fans. If the air temperature exceeds a defined threshold, the system controller displays warning messages on the console terminal, and if the temperature exceeds the shutdown threshold, the system controller shuts down the system. The system stores the present parameter measurements for both temperature and DC voltage in NVRAM so you can retrieve them later as a report of the last shutdown parameters.

If an internal power supply temperature or voltage reaches a critical level, the power supply shuts down without any interaction with the system processor.

The environmental monitoring functions use the following levels of status conditions to monitor the system:

•Normal—All monitored parameters are within normal tolerances.

•Warning—The system has exceeded a specified threshold. The system continues to operate, but operator action is recommended to bring the system back to a normal state.

•Critical—An out-of-tolerance temperature or voltage condition exists. The system continues to operate; however, the system is approaching shutdown. Immediate operator action is required.

•Shutdown—The processor has detected a temperature condition that could result in physical damage to system components and has disabled DC power to all internal components. This condition requires immediate operator action. All DC power remains disabled until you toggle the power switch. Before any shutdown, the system logs the status of monitored parameters in NVRAM so you can retrieve it later to help determine the cause of the problem.

•Power supply shutdown—The power supply detected an internal out-of-tolerance overvoltage, overcurrent, or temperature condition and shut itself down. All DC power remains disabled until you toggle the power switch.

Table 3-1lists the typical temperature thresholds for the Cisco 7201 router, and Table 3-2lists the DC power thresholds for the normal, warning, and critical (power supply-monitored) levels.

Table 3-1	Typical Processor-Monitored Temperature Thresholds
Parameter		High Warning	High Critical	Shutdown
Sensor 1: Inlet (U12, at the front edge		111oF (44oC)	138oF (59oC)	176oF (80oC)
of the board, top of the system board)
Sensor 2: Outlet (U20, near the fans,		120oF (49oC)	147oF (64oC)	183oF (84oC)
top of system board)
CPU die		194oF (90oC)	221oF (105oC)	230oF (110oC)

Table 3-2shows typical power supply-monitored DC-voltage thresholds.

Table 3-2	Typical Power Supply-Monitored DC-Voltage Thresholds
Parameter		Low Critical	Low Warning	High Warning	High Critical
+12.15V		+11.39V	+11.67V	+12.62V	+12.91V

Cisco 7201 Installation and Configuration Guide

OL-11364-04 3-5