Wireless Bridges in Visual C#

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ments in 24 GHz client adapters while upgrading to the higher-speed 5 GHz client adapters as the need arises The AP serves as the center point of a standalone wireless network or as the connection point between wireless and wired networks In large installations, wireless users within radio range of an AP can roam throughout a facility while maintaining uninterrupted access to the network Both the APs and clients are available in versions for home and office environments Office APs have more parameters to configure and are manageable via the Simple Network Management Protocol (SNMP) Sometimes the products permit the user to select the environment in which the product will operate The configuration utilities of such products actually have a check box for this purpose, enabling separate profiles to be created so that a client adapter can be easily used in any environment, plus public hot spots, without having to open the configuration utility to change the settings
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The function of a bridge is to extend the range of a wireless link and make multiple local area networks (LANs) at different locations appear to users as a single network Both functions are important, but in Wireless Fidelity (WiFi) networks, bridges are especially valued for their operating range They are used by enterprises to build WiFi networks and by wireless Internet service providers (WISPs) to extend the reach of their services Bridges come in a variety of configurations and price points At the low end, workgroup bridges extend the range of wireless connections within a building At the midrange, bridges provide building-to-building coverage within a campus environment At the high end, bridges extend wireless links across town or even between towns Although access points (APs) provide wireless clients with connections to wired LANs, wireless bridges connect APs to each other, expanding wireless coverage over greater distances Bridges do not normally accept connections from clients, only from other bridges and APs (see Figure 6-1), but they can be modified to serve as APs This has the advantage of greatly extending the range of an AP, enabling clients across town to access the wired LAN while continuing to pass traffic with other bridges Wireless bridges differ in their operating range The actual range depends on many factors, including the data rate (bandwidth) desired, line
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Figure 6-1 The role of a bridge in a wireless network
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of sight, antenna type, antenna cable length, and device receiving the transmission In an optimal installation, the range can be up to 25 miles Ranges up to 50 miles have been reported using various combinations of off-theshelf and custom-built components But with greater distance comes a greater susceptibility to signal interference Police radar and heavy machinery, for example, are intermittent sources of interference Another important consideration is that the bridge s antennas require not only a visual line of sight, but also a radio line of sight, which includes an elliptical region around the visual line of sight called the Fresnel zone (see Figure 6-2) For optimal performance, the Fresnel zone must be clear of all obstructions, including trees, power lines, buildings, and topographic features, such as mountains The bridge comes with its own Media Access Control (MAC) address, and the Internet Protocol (IP) address for a bridge is usually obtained via the Dynamic Host ConfigurationProtocol (DHCP) Alternatively, the network administrator can console in and set a static IP address Bridges also support 40/64-bit and 128-bit Wired Equivalent Privacy (WEP), which encrypts the payload of packets sent across a radio link The WEP key is a userdefined string of characters used to encrypt and decrypt data Since wireless bridges are usually placed outdoors, commercial versions usually come in moisture-proof enclosures and feature built-in lightning protection They support Power over Ethernet (PoE) in which the unused pairs in the Category 5 (CAT 5) cable carry electrical current from an Ethernet switch to power the unit Bridges also can be configured to support the Simple Network Management Protocol (SNMP), making the units easy to monitor
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