Cisco NAC3350-PROF-K9 Hardware Installation Guide - Page 51

Chapter 2 Preparing for Installation Preparing Your Site for Installation 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: • 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. Temperature and Humidity Guidelines Table 2-1 lists the operating and non-operating environmental site requirements for the Cisco NAC Appliance CAM/CAS. 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. Table 2-1 Operating and Nonoperating Environmental Specifications Specification Temperature, ambient operating Temperature, ambient nonoperating and storage Humidity, ambient (noncondensing) operating Humidity, ambient (noncondensing) nonoperating and storage Vibration, operating Minimum 50°F (10°C) -40°F (°C) 10% 5% 5-500 Hz, 2.20 g RMS random Maximum 95°F (35°C) 158°F (70°C) 90% 95% - Power Considerations You configure the Cisco NAC Appliance CAM/CAS with AC-input power only. Ensure that all power connections conform to the rules and regulations in the National Electrical Codes (NECs), as well as local codes. When planning power connections to your appliance, the following precautions and recommendations must be followed: • Check the power at your site before installation and periodically after installation to ensure that you are receiving clean power (free of spikes and noise). Install a power conditioner if necessary. • The AC power supply includes the following features: - Autoselect feature for 110-V or 220-V operation. - An electrical cord for all appliances. (A label near the power cord indicates the correct voltage, frequency, current draw, and power dissipation for the appliance.) OL-20326-01 Cisco NAC Appliance Hardware Installation Guide 2-9