Rack Configuration Considerations - Cisco 3110 Hardware Installation Manual

Rack Configuration Considerations

• 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
• Several styles of AC-input power supply cords are available for the chassis; make sure that you have the
• If you are using dual redundant (1+1) power supplies, we recommend that you use independent electrical
• Install an uninterruptible power source for your site, if possible.
Rack Configuration Considerations
See Rack-Mount the Chassis Using Slide Rails, on page 54
Consider the following when planning a rack configuration:
• Standard 19-inch (48.3 cm) 4-post EIA rack with mounting rails that conform to English universal hole
• The rack-mounting posts need to be 2 to 3.5 mm thick to work with the slide rail rack mounting.
• If you are mounting a chassis in an open rack, make sure that the rack frame does not block the intake
• If your rack includes closing front and rear doors, the doors must have 65 percent open perforated area
• Be sure enclosed racks have adequate ventilation. Make sure that the rack is not overly congested as each
• In an enclosed rack with a ventilation fan in the top, heat generated by equipment near the bottom of the
• Baffles can help to isolate exhaust air from intake air, which also helps to draw cooling air through the
Cisco Secure Firewall 3110, 3120, 3130, and 3140 Hardware Installation Guide
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correct appliance input-power requirement.
correct style for your site.
circuits for each power supply.
spacing according to section 1 of ANSI/EIA-310-D-1992.
or exhaust ports.
evenly distributed from top to bottom to permit adequate airflow.
chassis generates heat. An enclosed rack should have louvered sides and a fan to provide cooling air.
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.
chassis. The best placement of the baffles depends on the airflow patterns in the rack. Experiment with
different arrangements to position the baffles effectively.
Installation Preparation
for the procedure for rack-mounting the chassis.