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Bluetooth Wireless Technologies Essay

2752 words - 11 pages

I. INTRODUCTIONBluetooth is an open wireless protocol for exchanging data over short distances from fixed and mobile devices, creating personal area networks (PANs). It was originally conceived as a wireless alternative to RS232 data cables. It can connect several devices, overcoming problems of synchronization. The Bluetooth wireless technology provides the means for the replacement of cables and infrared links that connect one device to another with a universal short-range radio link. Although this technology was initially developed for replacing cables, it has now evolved into a way to create small radio LANs.II. HISTORYThe Bluetooth SIG The name "Bluetooth" and its logo are trademarked by the privately held trade association named the Bluetooth Special Interest Group (SIG). [pic][pic][pic][pic][pic]Founded in September 1998, the Bluetooth SIG is a unification of leaders in the telecommunications, computing, network, industrial automation, and Automotive industries. Today, the Bluetooth SIG is responsible for encouraging and supporting research and development in Bluetooth technology. The Bluetooth SIG includes promoter member companies Microsoft, Ericsson, IBM, Intel, Agere, Motorola, Nokia, and Toshiba, plus thousands of Associate and Adopter member companies (BlueTomorrow.com's parent company, SP Commerce LLC, is a licensed and certified Adopter member of the Bluetooth SIG). A Scandinavian firm originally designed the logo at the time the SIG was formally introduced to the public. Keeping to the same origin as the Bluetooth name, the logo unites the Runic alphabetic characters "H", which looks similar to an asterisk, and a "B", which are the initials for Harald Bluetooth. If you look close enough you can see both embodied in the logo. The word Bluetooth is an anglicized version of Old Norse Blátönn or Danish Blåtand, the name of the tenth-century king Harald I of Denmark and Norway, who united dissonant Scandinavian tribes into a single kingdom. The implication is that Bluetooth does the same with communications protocols, uniting them into one universal standard. It is possible that the name may have been inspired less by the historical Harald, than by the loose interpretation of him in The Long Ships by Frans Gunnar Bengtsson, a Swedish Viking-inspired novel.III. USESBluetooth is a standard and communications protocol primarily designed for low power consumption, with a short range (power-class-dependent: 1 meter, 10 meters, 100 meters) based on low-cost transceiver microchips in each device. Bluetooth makes it possible for these devices to communicate with each other when they are in range. Because the devices use a radio (broadcast) communications system, they do not have to be in line of sight of each other.|Class |Maximum Permitted Power |Range || |mW (dBm) |(approximate) ||Class 1 |100 mW (20 dBm) |~100 meters ||Class 2 |2.5 mW (4 dBm) |~10 meters ||Class 3 |1 mW (0 dBm) |~1 meter |In most cases the effective range...

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