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Preface
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Ethernet-based workgroups For the first time, wireless LANs (WLANs) became truly usable for most work environments and office applications Multiple vendors quickly came to support the 80211b standard, which drove down costs and increased demand, fueling even greater vendor support In addition, the 80211b standard assured users of device interoperability The WECA was formed to certify the interoperability of WLAN products based on the IEEE 80211b specification and to promote the use of the standard across all market segments With the rapid adoption of the 80211b standard, users began to have a choice in the selection of interoperable, high-performance wireless equipment at an affordable price Over 500 vendors now offer WiFi products Many types of organizations today see a tremendous value in adding wireless links to the corporate LAN For years, notebook computers have held out the promise of anytime, anywhere computing, but with access to the LAN and the Internet becoming such an integral part of business, a wireless connection is needed to make the promise of anytime, anywhere computing become a reality Wireless devices enable users to be constantly connected from virtually anywhere: a desk, a conference room, the coffee shop, or another building on a corporate or academic campus In addition to job autonomy, wireless provides users with maximum flexibility, productivity, and efficiency, while facilitating collaboration and cooperation with colleagues, business partners, and customers In addition, wireless can bring LAN access to locations where laying cable is difficult or expensive As with any technology, wireless is continually evolving, offering advancements in speed, bandwidth, security, and more As noted, the 80211b standard, the most widely deployed wireless standard, operates in the 24 GHz unlicensed radio band, delivering a maximum data rate of 11 Mbps For some organizations, this performance is sufficient for their current needs, but others are clamoring for a new generation of devices that will deliver even greater throughput, access, and functionality for their rapidly growing numbers of wireless users Wireless vendors are responding Currently, the IEEE is focusing on two higher-performance standards: 80211a and 80211g The IEEE ratified the 80211a standard in 1999, but the first 80211a-compliant products did not begin appearing on the market until December 2001 The 80211a standard delivers a maximum data rate of 54 Mbps and 8 nonoverlapping frequency channels, resulting in increased network capacity, improved scalability, and the capability to create microcellular deployments without interference from adjacent cells Operating in the unlicensed portion of the 5 GHz radio band, 80211a is also immune to interference from devices that operate in
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Preface
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the 24 GHz band, such as microwave ovens, cordless phones, and Bluetooth (a short-range, low-speed, point-to-point, personal area network [PAN]wireless standard) The 80211a standard is not, however, compatible with existing 80211bcompliant wireless devices, but the two technologies can operate in the same vicinity without interfering with each other Dual-band APs can support both technologies at the same time with separate radio cards This allows different classes of users to be supported; power users can transfer large files over a high-capacity 5 GHz link, while users of routine office applications can use the 24 GHz link Each class of user will have the bandwidth it needs without causing throughput problems for the other A barrier to the widespread adoption of 80211a has been the lack of interoperability certification This changed in late 2002, when the WiFi Alliance announced WiFi interoperability certification testing for 5 GHz 80211a-based products The 80211a interoperability testing had been delayed until a basic requirement of the WiFi Alliance had been met: the availability of multiple products based on a second IEEE 80211a chipset The announcement of a second chipset was made in April 2002 and products were available for testing two months later The availability of products allowed the WiFi Alliance to develop the interoperability benchmark against which all products are tested As with 80211b products, 80211a products that pass the certification will be granted the WiFi seal of interoperability Another standard, 80211g, delivers the same 54 Mbps maximum data rate as 80211a, but with an additional and compelling advantage: backward compatibility with 80211b equipment This means that 80211b client cards will work with 80211g APs and 80211g client cards will work with 80211b APs Because 80211g and 80211b operate in the same 24 GHz unlicensed band, migrating to 80211g will be an affordable choice for organizations with existing 80211b wireless infrastructures Much like Ethernet at 10 Mbps and Fast Ethernet at 100 Mbps, 80211g products can be mixed and matched with 80211b products on the same network The wireless wave is just beginning The new emphasis on worker mobility will drive the unprecedented growth of WLANs worldwide Organizations of all types and sizes, therefore, must begin planning their wireless strategies today Wireless technologies and services have become so popular worldwide, as well as sufficiently sophisticated and complex, as to merit dozens of books on the topic being published every year This book clearly explains the essential concepts of wireless, including services, applications, protocols, administration and management, security, and deployment issues
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Bar Code Recognizer In VS .NET
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Universal Product Code Version A Scanner In .NET Framework
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