Cisco AIR-AP1220B-A-K9 Hardware Installation Guide - Page 30

Unpacking the Access Point Chapter 2 Installation Because of the redundancy in coverage overlap, network access is not lost if an access point fails. Upon failure of the access point, the station automatically roams to an operational access point. With this architecture, each device in the RF network must be configured with the same SSID to provide the roaming capability. Site Surveys Because of differences in component configuration, placement, and physical environment, every network application is a unique installation. Before installing multiple access points, you should perform a site survey to determine the optimum utilization of networking components and to maximize range, coverage, and network performance. When supporting dual mode 2.4-GHz and 5-GHz operation, you may have to perform a site survey for each of the operating frequencies. Consider the following operating and environmental conditions when performing a site survey: • Frequency-The radio coverage area for the 5-GHz radio is less than the coverage area for the 2.4-GHz radio. • Single- and dual-band operation-When supporting both single- and dual-band access points, you should perform a site survey for each of the operating frequencies. • Data rates-Sensitivity and range are inversely proportional to data bit rates. The maximum radio range is achieved at the lowest workable data rate. A decrease in receiver threshold sensitivity occurs as the radio data increases. • Antenna type and placement-Proper antenna configuration is a critical factor in maximizing radio range. As a general rule, range increases in proportion to antenna height. • Physical environment-Clear or open areas provide better radio range than closed or filled areas. Also, the less cluttered the work environment, the greater the range. • Obstructions-A physical obstruction such as metal shelving or a steel pillar can hinder performance of wireless devices. Avoid locating the devices in a location where there is a metal barrier between the sending and receiving antennas. • Building materials-Radio penetration is greatly influenced by the building material used in construction. For example, drywall construction allows greater range than concrete blocks. Metal or steel construction is a barrier to radio signals. Unpacking the Access Point Follow these steps to unpack the access point: Step 1 Step 2 Step 3 Open the shipping container and carefully remove the contents. Return all packing materials to the shipping container and save it. Ensure that all items listed in the "Package Contents" section are included in the shipment. Check each item for damage. If any item is damaged or missing, notify your authorized Cisco sales representative. Cisco Aironet 1200 Series Access Point Hardware Installation Guide 2-6 OL-2155-02