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Bluetooth wireless technology (named for 9th-century Danish king Harald Bluetooth) is designed to create small wireless personal area networks (PANs) that link PCs to peripheral devices such as PDAs and printers, input
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Mike Meyers A+ Guide to Managing and Troubleshooting PCs
devices such as keyboards and mice, and even consumer electronics such as cell phones, home stereos, televisions, home security systems, and so on Bluetooth is not designed to be a full-function networking solution, nor is it meant to compete with Wi-Fi If anything, Bluetooth is poised to replace infrared as a means to connect PCs to peripherals The IEEE organization has made Bluetooth the basis for its forthcoming 80215 standard for wireless PANs Bluetooth uses the FHSS spreadspectrum broadcasting method, switching between any of the 79 frequencies available in the 245-GHz range Bluetooth hops frequencies some 1600 times per second, making it highly resistant to interference It transfers data from 723 Kbps to 1 count em, 1 Mbps, with a maximum range of 10 meters (just over 30 feet) Some high-powered Bluetooth devices have throughput speed of a whopping 2 Mbps and a maximum range of up to 300 feet, but these are uncommon Bluetooth is not designed to be a full-fledged wireless networking solution Bluetooth is made to replace the snake s nest of cables that currently connects most PCs to their various peripheral devices keyboard, mouse, printer, speakers, scanner, and the like but you won t be swapping out your 80211-based networking devices with Bluetooth-based replacements anytime soon Having said that, Bluetooth-enabled wireless networking is comparable to other wireless technologies in a few ways:
Like infrared, Bluetooth is acceptable for quick file transfers where a wired connection (or a faster wireless connection) is unavailable Bluetooth s speed and range make it a good match for wireless print server solutions
Bluetooth Wireless Networking Hardware Bluetooth hardware comes either integrated into many newer portable electronic gadgets such as PDAs and cell phones or as an adapter added to an internal or external expansion bus Bluetooth networking is enabled through ad-hoc styled PC-to-PC (or PDA, handheld computer, or cell phone to-PC) connections, or in an infrastructurelike mode through Bluetooth access points Bluetooth access points are very similar to 80211-based access points, bridging wireless Bluetooth PAN segments to wired LAN segments
Cellular
Cellular wireless networks enable you to connect to the Internet through a network-aware personal digital assistant (PDA) or cell phone Figure 2177 shows a higher-end cell phone with an Internet connection Using an add-on PC Card, you can connect any laptop to a cellular network as well Figure 2178 shows a Sprint Mobile Broadband Card In areas with broad cell phone coverage, such as big cities, cellular wireless networks offer high-speed access (400 to 700 Kbps download speeds) anywhere you go Just fire up your device or portable and start surfing the Web! In remote areas, the speed drops down to something closer to modem connection speeds (See 22, The Internet, for the scoop on modems)
Figure 2177
Sony Ericsson phone
21: Local Area Networking
Figure 2178
Cellular networks use various protocols to connect, such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), and Code Division Multiple Access (CDMA) These protocols are handled seamlessly by the software and hardware What the end user sees is TCP/IP, just as if he or she connected through a wired network About the only real downside to cellular wireless networks is the price The cell phone companies (notably Sprint and Cingular) are quite proud of their network service As the technology matures, competition among the cellular network providers should bring the price down to something affordable for many people At this point, though, it s usually much more cost-effective to go to a coffee shop or library and connect via Wi-Fi
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