Preventive Site Configuration: Maintaining Normal Operation - Cisco 7000 Series Hardware Installation And Maintenance Manual

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Site Requirements
If the temperature of the room air drawn into the chassis is higher than desirable, the air temperature
inside the chassis may 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 air flow and create an overtemperature condition.
Because the inlet and exhaust air flows into one side of the chassis and out the other side, other
devices can be rack-mounted with little or no 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 side of
the chassis. When viewing the router chassis from the interface processor end, the inlet air is drawn
in through the right side of the chassis, and the exhaust air is forced out of the left side.
(See Figure 1-6.)
Table 2-12 lists 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 following ranges are 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 2-12
Temperature, ambient operating
Temperature, ambient nonoperating and storage
Humidity (RH), ambient (noncondensing) operating
Humidity (RH), ambient (noncondensing) nonoperating
and storage
Altitude, operating and nonoperating
Vibration, operating
Vibration, nonoperating

Preventive Site Configuration: Maintaining Normal Operation

Planning a proper location for the router and the layout of your equipment rack or wiring closet are
essential for successful system operation. Equipment placed too close together or inadequately
ventilated can cause system overtemperature conditions. In addition, chassis panels made
inaccessible by poor equipment placement can make system maintenance difficult. Following are
precautions that can help avoid problems during installation and ongoing operation.
2-16 Cisco 7010 Hardware Installation and Maintenance
Operating temperature range: 32 through 104°F (0 through 40°C).
Operating humidity range: 10 to 90%, noncondensing.
Air flow: Cooling air is drawn in through the sides of the chassis. Keep both sides of the chassis
clear of obstructions, including dust, and away from the exhaust ports of other equipment.
Specifications for Operating and Nonoperating Environments
Minimum
32°F (0°C)
–4°F (-20°C)
10%
5%
Sea level
5–200 Hz, 0.5 g (1 oct./min.)
5–200 Hz, 1 g (1 oct./min.)
200–500 Hz, 2 g (1 oct./min.)
Maximum
104°F (40°C)
149°F (65°C)
90%
95%
10,000' (3050 m)

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