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Cisco 7204 Installation and Configuration Guide
OL-5101-02
Chapter1 Product Overview
Functional Overview
When you remove or insert a port or service adapter in a Cisco 7204 router, the midplane pins send
signals to notify the system, which then performs as follows:
1. Rapidly scans the midplane for configuration changes.
2. Initializes all newly inserted port and service adapters, noting any removed port adapter interfaces
and placing them in the administratively shut down state.
3. 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 shut down state, as if they were present (but not configured) a t boot time. If
a similar port adapter type is reinserted into a slot, its ports are configured and brought on line up to
the port count of the original port adapter.
Environmental Monitoring and Reporting Functions
Environmental monitoring and reporting functions are controlled by the network proce ssing 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 c an r etrieve 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 -8 lists the temperature thresholds for the processor-monitored levels of a Cisco72 04 router that
has an installed NPE-100, NPE-150, or NPE-200.
Note Refer to the Cisco 7200 VXR Installation and Configuration Guide publication for the temperature
thresholds and processor-monitored levels of a Cisco 7200 VXR router that has a n instal le d NPE -3 00.
The Cisco 7204 does not support the NPE-300.
Table1-8 Typical Processor-Monitored Temperature Thresholds (NPE-100, NPE-150, and NPE-200)
Parameter High Warning High Critical Shutdown
NPE-100 or NPE-200
Chassis inlet 104°F (40°C) 122°F (50°C) –
Chassis outlet 1 109°F (43°C) 127°F (53°C) 136°F (58°C)
Chassis outlet 2 167°F (75°C) 167°F (75°C) –
Chassis outlet 3 122°F (50°C) 140°F (60°C) 149°F (65°C)
NPE-150
Chassis inlet 104°F (40°C) 122°F (50°C) –