Site Environment
When planning the site layout and equipment locations, consider the information in the next section to help
avoid equipment failures and reduce the possibility of environmentally caused shutdowns. If you are currently
experiencing shutdowns or unusually high error rates with your existing equipment, these considerations may
help you isolate the cause of failures and prevent future problems.
Power Supply Considerations
See
Power Supply Modules, on page 18
for more detailed information about the power supply modules in
the security appliance.
When installing the chassis, consider the following:
•
Check the power at the site before installing the chassis to ensure that it is
“
clean
”
(free of spikes and
noise). Install a power conditioner, if necessary, to ensure proper voltages and power levels in the
appliance input voltage.
•
Install proper grounding for the site to avoid damage from lightning and power surges.
•
The chassis does not have a user-selectable operating range. Refer to the label on the chassis for the
correct appliance input-power requirement.
•
Install an uninterruptible power source for your site, if possible.
•
If you are using dual redundant (1+1) power supplies, we recommend that you use independent electrical
circuits for each power supply.
Equipment Rack Configuration Considerations
Consider the following when planning an equipment-rack configuration:
•
If you are mounting a chassis in an open rack, make sure that the rack frame does not block the intake
or exhaust ports.
•
Standard 19-inch (48.3 cm) four-post EIA rack with mounting rails that conform to English universal
hole spacing per section 1 of ANSI/EIA-310-D-1992.
•
Front and rear doors
—
If your rack includes closing front and rear doors, the doors must have 65 percent
open perforated area evenly distributed from top to bottom to permit adequate airflow.
•
Be sure enclosed racks have adequate ventilation. Make sure that the rack is not overly congested as
each chassis generates heat. An enclosed rack should have louvered sides and a fan to provide cooling
air.
•
In an enclosed rack with a ventilation fan in the top, heat generated by equipment near the bottom of
the rack can be drawn upward and into the intake ports of the equipment above it in the rack. Ensure
that you provide adequate ventilation for equipment at the bottom of the rack.
•
Baffles can help to isolate exhaust air from intake air, which also helps to draw cooling air through the
chassis. The best placement of the baffles depends on the airflow patterns in the rack. Experiment with
different arrangements to position the baffles effectively.
Cisco Firepower 4100 Series Hardware Installation Guide
41
Prepare for Installation
Site Environment
