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Cisco 7206 Installation and Configuration Guide

OL-5102-02

Chapter 1 Product Overview

Functional Overview

When you remove or insert a port adapter or service adapter in a Cisco 7206 router, the midplane pins
send signals to notify the system, which then performs as follows:

Rapidly scans the midplane for configuration changes.

Initializes all newly inserted port adapters and service adapters, noting any removed port adapter
interfaces and placing them in the administratively shutdown state.

Brings all previously configured interfaces on the port adapter back to the state they were in when
they were removed (service adapters do not have interfaces). Any newly inserted interfaces are put
in the administratively shutdown state, as if they were present (but not configured) at boot time. If
a similar port adapter type is reinserted into a slot, its ports are configured and brought online up to
the port count of the original port adapter. (A service adapter has no configurable ports.)

Environmental Monitoring and Reporting Functions

Environmental monitoring and reporting functions are controlled by the network processing engine and
allow you to maintain normal system operation by identifying and resolving adverse conditions prior to
loss of operation. The environmental monitoring functions constantly monitor the internal chassis air
temperature and DC supply voltages and currents. Each power supply monitors its own voltage and
temperature and shuts itself down if it detects a critical condition within the power supply. If conditions
reach shutdown thresholds, the system shuts down to avoid equipment damage from excessive heat. The
reporting functions periodically log the values of measured parameters so that you can retrieve them for
analysis later, and the reporting functions display warnings on the console if any of the monitored
parameters exceed defined thresholds.

Environmental Monitoring

The environmental monitoring functions use four sensors, two on the network processing engine and two
on the I/O controller, to monitor the temperature of the cooling air as it moves through the chassis.

Table 1-10

lists the temperature thresholds for each network processing engine type.

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 that you can retrieve them later as a report of the last shutdown parameters.

The power supplies monitor internal power supply temperature and voltages. A power supply is either
within tolerance (normal) or out of tolerance (critical). If an internal power supply temperature or
voltage reaches a critical level, the power supply shuts down without any interaction with the system
processor.

Table 1-10

Typical Processor-Monitored Temperature Thresholds

Parameter

High Warning

High Critical

Shutdown

NPE-100 or NPE-200

Chassis inlet

104°F (40°C)

122°F (50°C)

–

Chassis outlet 1