Facility Cooling Requirements - Cisco 6000 Series Site Planning Manual

Chapter 2 Power and Cooling
The airflow volumes for a fully loaded Cisco NCS 6008 chassis are as follows:
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A replaceable air filter is located on the front of the chassis. We recommend that you check the air filter
once a month. How often you should replace the air filter depends on the facility environment. In a dirty
environment, or when you start getting frequent temperature alarms, you should always check the intake
grills for debris, and then check the air filter to see if it needs to be replaced.

Facility Cooling Requirements

The Cisco NCS 6008 chassis consumes considerable power, which dissipates much heat.
When there is one or more fan failures, the system monitors the temperature sensors mounted on the
critical components within the various boards and increases fan throughput to hold temperatures below
their critical threshold. The system does this monitoring even when all the fans are operating correctly
(so that it protects the components if the air intake is blocked for example). If temperatures exceed the
critical threshold, the associated cards are shut down to avoid permanent damage.
If either fan tray is removed from the chassis, the other fan tray will immediately spin up to maximum
speed in order to provide sufficient cooling performance. Although the system can operate indefinitely
at full capacity with just one operational fan tray up to an ambient room temperature of 104°F (40°C)
without overheating, there is no longer any redundancy offered, so immediate replacement of the missing
fan tray is advised.
When both fan trays are removed, a critical alarm is generated along with a system message warning you
to install a fan tray or the entire chassis will shutdown in approximately 45 seconds.
To ensure that the site provides the proper air circulation for the system:
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OL-29236-02
Chassis airflow: Up to 2500 cubic feet (70,792 liters) per minute
DC power system airflow: Up to 240 cubic feet (6796 liters) per minute
AC power system airflow: Up to 180 cubic feet (5097 liters) per minute
Make certain that the site is as dust free as possible. Dusty environments can clog the air filter or
power supply intake vents, reducing the cooling airflow through the system.
Allow sufficient airflow by maintaining a minimum of 6 inches (15.2 cm) of clearance at both the
inlet and exhaust openings on the chassis and PMs. If airflow is blocked or restricted, or if inlet air
is too warm, an over-temperature condition can occur. Under extreme conditions, the environmental
monitoring system shuts down the power to protect the routing system components.
Cisco Network Convergence System 6000 Series Routers Site Planning Guide
Facility Cooling Requirements
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