Cisco Systems 7500 Series manual Minimum Maximum

Chapter 2 Preparing for Installation

Site Environment, Chassis Temperature, and Airflow Guidelines

specifications for the electrical interfaces supported by the Cisco 7500 series routers, refer to the

companion publication Interface Processor Installation and Configuration Guide.

Site Environment, Chassis Temperature, and Airflow Guidelines

Cisco 7500 series routers can operate as standalone systems placed on a table or as rack-mounted systems in a data processing or lab environment. (We recommend rack-mounting for all Cisco 7500 series routers.)

The internal fan or blower operates so that it maintains an acceptable operating temperature inside the chassis. The router requires a dry, clean, well-ventilated, and air-conditioned environment. The internal blower pulls ambient air through the chassis to cool the internal components. To allow sufficient airflow, maintain a minimum of 2 inches (5.08 cm) of clearance at both the inlet and exhaust openings on the chassis. If the airflow is blocked or restricted, or if the inlet air is too warm, an overtemperature condition can occur. Under extreme conditions, the environmental monitoring system will shut down the power to protect the system components.

To help maintain normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site before installation. After installation, make sure that the site maintains an ambient temperature of 32 through 104°F (0 through 40°C), and keep the area around the chassis as free from dust as is practical. For a description of the environmental monitor and status levels, see the “Environmental Monitoring and Reporting Overview for the Cisco 7500 Series” section on page 2-22.

If the temperature of the air drawn into the chassis is higher than desirable, the air temperature inside the chassis might also be too high. This condition can occur when the wiring closet or rack in which the chassis is mounted is not ventilated properly, when the exhaust of one device is placed so it enters the air inlet vent of the chassis, or when the chassis is the top unit in an unventilated rack. Any of these conditions can inhibit airflow and create an overtemperature condition.

Because the inlet air flows into one part of the chassis and out another, other devices can be rack-mounted with as little as 1 inch (2.54 cm) of clearance above and below the chassis. However, when mounting a router in a rack with other equipment, or when placing it on a table with other equipment located close by, ensure that the exhaust from other equipment does not blow into the inlet of the chassis. The inlet air is drawn in and exhausted as shown in Figure 2-7(for the Cisco 7505), Figure 2-8(for the Cisco 7507 and Cisco 7507-MX), and Figure 2-9(for the Cisco 7513, Cisco 7513-MX, and Cisco 7576).

Table 2-1lists the operating and nonoperating environmental site requirements. To maintain normal operation and ensure high system availability, maintain an ambient temperature and clean power at your site.

The ranges in Table 2-1are those within which the router will continue to operate; however, a measurement that is approaching the minimum or maximum of a range indicates a potential problem. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach the maximum operating range.

		Table 2-1	Environmental Specifications for the Cisco 7500 Series Routers
		Specifications		Minimum	Maximum
		Temperature, ambient operating		32°F (0°C)	104°F (40°C)
		Temperature, ambient nonoperating and		–4°F (–20°C)	149°F (65°C)
		storage
		Humidity, ambient (noncondensing)		10%	90%
		operating
	Cisco 7500 Series Installation and Configuration Guide
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