Motorola 5440AP User Manual - Page 8
Applications, Configuration Options - Rf, Ip, Dfs
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Canopy 400 Series OFDM AP and SM User Guide Figure 3: LOS, nLOS, and NLOS Whereas multipathing degrades a link in some technologies, like FSK, OFDM can often use multipathing to advantage to overcome nLOS and NLOS, especially in cases where the Fresnel zone is only partially blocked by buildings, "urban canyons", or foliage. OFDM tends to help especially when obstacles are near the middle of the link, and less so when the obstacles are very near the SM or AP. However, attenuation through walls and trees is substantial for any use of the 5.4 GHz frequency band. Even with OFDM, 5.4 GHz products should not be expected to penetrate walls or extensive trees and foliage. 2.2 APPLICATIONS Applications for the Canopy 400 Series system include • NLOS/nLOS video surveillance in metro areas • High throughput enterprise applications • Extend networks into urban areas • Extend networks into areas with foliage 2.3 CONFIGURATION OPTIONS - RF, IP, DFS The Canopy 400 Series product uses the Canopy Media Access Controller (MAC) layer. This means that settings like Downlink Data %, Range, and Control Slots will look very familiar to operators, and an AP can communicate to over 200 SMs, just as Canopy does. The GUI (Graphical User Interface) is almost identical to Canopy's, with a few additions to support OFDM-specific features. Canopy network features like High Priority using DiffServ, MIR, CIR, NAT, DHCP and VLAN are all available for the Canopy 400 Series OFDM radios, and are configured in the same way. DFS (Dynamic Frequency Selection) is provided for regulatory compliant operation in the 5.4 GHz band, and is activated using the "Region Code" feature, the same as in Canopy Release 8.2. Two alternate frequencies can be configured to provide service in the unlikely case a module detects radar and triggers DFS, the same as standard Canopy. "External Antenna Gain" may need to be configured consistent with any antennas used, to avoid making the system overly sensitive to Version 1, April 2008 Page 8 of 40