Airflow Guidelines; Temperature And Humidity Guidelines - Cisco 1120 Installation Manual

Preparing Your Site for Installation
The following precautions will help you plan an acceptable operating environment for your appliance
and will help you avoid environmentally caused equipment failures:
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Note
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Airflow Guidelines

To ensure adequate airflow through the equipment rack, it is recommended that you maintain a clearance
of at least 6 inches (15.24 cm) at the front and the rear of the rack. If airflow through the equipment rack
and the appliances that occupy it is blocked or restricted, or if the ambient air being drawn into the rack
is too warm, an overtemperature condition within the rack and the appliances that occupy it can occur.
The site should also be as dust-free as possible. Dust tends to clog the appliance fans, reducing the flow
of cooling air through the equipment rack and the appliances that occupy it. This reduction increases the
risk of an overtemperature condition.
Additionally, the following guidelines will help you plan your equipment rack configuration:
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Temperature and Humidity Guidelines

Table 2-1
Series appliance. The appliance normally operates within the ranges listed; however, a temperature
measurement approaching a minimum or maximum parameter indicates a potential problem. Maintain
normal operation by anticipating and correcting environmental anomalies before they approach critical
values by properly planning and preparing your site before you install the appliance.
Installation Guide for the Cisco 1120 Secure Access Control Server 4.2
2-8
Ensure that the room where your appliance operates has adequate circulation. Electrical equipment
generates heat. Without adequate circulation, ambient air temperature may not cool equipment to
acceptable operating temperatures. For more information, see
Ensure that the site of the rack includes provisions for source AC power, grounding, and
network cables.
Allow sufficient space to work around the rack during the installation. You need:
At least 3 feet (9.14 m) adjacent to the rack to move, align, and insert the appliance.
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At least 24 inches (61 cm) of clearance in front of and behind the appliance for maintenance
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after installation.
To mount the appliance between two posts or rails, the usable aperture (the width between the inner
edges of the two mounting flanges) must be at least 17.7 inches (45.0 cm).
The rack-mount kit does not include a 2-post equipment rack.
Use appropriate strain-relief methods to protect cables and equipment connections.
To avoid noise interference in network interface cables, do not route them directly across or along
power cables.
Always follow ESD-prevention procedures as described in
Damage, page 2-5 to avoid damage to equipment. Damage from static discharge can cause
immediate or intermittent equipment failure.
Besides airflow, you must allow clearance around the rack for maintenance.
When mounting an appliance in an open rack, ensure that the rack frame does not block the front
intakes or the rear exhausts.
lists the operating and non-operating environmental site requirements for the CSACS 1120
Chapter 2 Preparing for Installation
Airflow Guidelines, page
Preventing Electrostatic Discharge
2-8.
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