Environmental Monitoring - Cisco CISCO7201 Installation And Configuration Manual

Chapter 3 Starting and Configuring the Router

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:
•
•
•
•
•
Table 3-1
power thresholds for the normal, warning, and critical (power supply-monitored) levels.
Table 3-1
Parameter
Sensor 1: Inlet (U12, at the front edge
of the board, top of the system board)
Sensor 2: Outlet (U20, near the fans,
top of system board)
CPU die
Table 3-2
Table 3-2
Parameter
+12.15V
OL-11364-04
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.
lists the typical temperature thresholds for the Cisco 7201 router, and
Typical Processor-Monitored Temperature Thresholds
shows typical power supply-monitored DC-voltage thresholds.
Typical Power Supply-Monitored DC-Voltage Thresholds
Low Critical
+11.39V
High Warning High Critical
o o o
111 F (44 C) 138 F (59
o o o
120 F (49 C) 147 F (64
o o o
194 F (90 C) 221 F (105
Low Warning High Warning
+11.67V +12.62V
Cisco 7201 Installation and Configuration Guide
Functional Overview
Table 3-2 lists the DC
Shutdown
o o o
C) 176 F (80 C)
o o o
C) 183 F (84 C)
o o o
C) 230 F (110 C)
High Critical
+12.91V
3-5