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Preventing Electrostatic Discharge Damage
Locating for Easy Maintenance
Keep at least 3 feet of clear space in front of and behind the rack. This space ensures that you can remove the
controller components and perform routine maintenance and upgrades easily.
Avoid installing the controller in a congested rack and consider how the routing of cables from other pieces
of equipment in the same rack might affect access to the controller's cards.
The front and top of the chassis must remain unobstructed to ensure adequate airflow and prevent overheating
inside the chassis.
Allow the following clearances for normal system maintenance:
• At the top of the chassis—At least 3 in. (7.6 cm)
• In front of the chassis—3 to 4 ft (91.44 cm to 121.92 cm)
To avoid problems during installation and ongoing operation, follow these general precautions when you plan
the equipment locations and connections:
• Use the show environment all and the show facility-alarm status commands regularly to check the
• Keep the controller off the floor and out of the areas that collect dust.
• Follow ESD-prevention procedures to avoid damage to equipment. Damage from static discharge can
Locating for Proper Airflow
Ensure that the location of the controller has enough airflow to keep the system operating within the
environmental characteristics, and the air temperature is sufficient to compensate for the heat dissipated by
the system.
Avoid locating the controller in a location in which the chassis air intake vents could draw in the exhaust air
from adjacent equipment. Consider how the air flows through the controller. The airflow direction is front to
back with ambient air drawn in from the venting located on the chassis' front sides.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage occurs when electronic cards or components are improperly handled
resulting in complete or intermittent failures. Static electricity can harm delicate components inside your
system. To prevent static damage, discharge static electricity from your body before you touch any of your
system components, such as a microprocessor. As you continue to work on your system, periodically touch
an unpainted metal surface on the computer chassis.
The following are guidelines for preventing ESD damage:
• Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact. Before
Cisco Catalyst CW9800H1 and CW9800H2 Wireless Controllers Hardware Installation Guide
42
internal system status. The environmental monitor continually checks the interior chassis environment;
it provides warnings for high temperature and creates reports on any occurrences. If warning messages
are displayed, take immediate action to identify the cause and correct the problem. For more information
on these commands, see the Environmental Monitoring and Reporting Functions section.
cause immediate or intermittent equipment failure.
removing a card from the chassis, connect the equipment end of the strap to the ESD plug at the bottom
of the chassis below the power entry modules.
Preparing Your Site for Installation
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