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Preparing for Installation
• To ensure normal operation, maintain ambient airflow. If the airflow is blocked or restricted, or if the
• Multiple switches can be rack mounted with little or no clearance above and below the chassis. However,
Temperature
Temperature extremes may cause a system to operate at reduced efficiency and cause a variety of problems,
including premature aging and failure of chips, and failure of mechanical devices. Extreme temperature
fluctuations may also cause chips to become loose in their sockets. Observe the following guidelines:
• Ensure that the chassis has adequate ventilation.
• Do not place the chassis within a closed-in wall unit or on top of cloth, which can act as thermal insulation.
• Do not place the chassis where it will receive direct sunlight, particularly in the afternoon.
• Do not place the chassis next to a heat source of any kind, including heating vents.
• Adequate ventilation is particularly important at high altitudes. Make sure that all the slots and openings
• Clean the installation site at regular intervals to avoid buildup of dust and debris, which may cause a
• If system is exposed to abnormally low temperatures, allow a two hour warm up period, in ambient
Failure to observe these guidelines may damage the chassis' internal components.
Air Flow
The switch is designed to be installed in an environment where there is a sufficient volume of air available to
cool the supervisor engines, modules, and power supplies. If there are any constraints with regard to the free
flow of air through the chassis, or if the ambient air temperature is elevated, the switch environmental monitor
may then shut down the system to protect the system components.
To maintain proper air circulation through the switch chassis, we recommend that you maintain a minimum
space of 6 inches (15 cm) between a wall and the chassis and power supply unit air intakes or a wall and the
chassis and power supply unit hot air exhausts. In situations where the switch chassis are installed in adjacent
racks, you should allow a minimum space of 12 inches (30.5 cm) between the air intake of one chassis and
the hot air exhaust of another chassis. Failure to maintain adequate spacing between chassis may cause the
switch chassis that is drawing in the hot exhaust air to overheat and fail.
If you are installing your switch in an enclosed or partially enclosed rack, we strongly recommend that you
verify that your site meets the following guidelines:
• Verify that the ambient air temperature within the enclosed or partially enclosed rack is within the chassis
intake air is too warm, an over-temperature condition may occur. The switch environmental monitor may
then shut down the system to protect the system components.
when mounting a switch in a rack with other equipment, or when placing it on the floor near other
equipment, ensure that the exhaust from other equipment does not blow into the air intake vent of the
switch chassis.
on the system remain unobstructed, especially the fan vent on the chassis.
system to overheat.
temperature no lower than 32°F (0 °C) before turning on.
operating temperature limits. After installing the chassis in the rack, power up the chassis and allow the
chassis temperature to stabilize (approximately 2 hours).
Cisco Catalyst 9300 Series Switches Hardware Installation Guide
Temperature
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