Bluetooth

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History:
- The name Bluetooth is borrowed from Harald Bluetooth, a king in Denmark more than 1,000 years ago.
- a long time ago (historians differ on the exact dates, but it was sometime in the 10th Century C.E.) in a country far, far away, (which was mostly Denmark, with a little bit of Norway added in for flavor,) there lived a Viking king who was principally noted for converting to a foreign religion called Christianity. He was known as Harald Bluetooth, son of Gorm the Old, and he united most of Denmark before his estranged son, Sven Forkbeard, sent him to Valhalla and took over the family business. A little more than 1000 years later, succumbing to an attack of Scandinavian pride, the giant Swedish telecom manufacturer Ericsson decided to honor old, weird Harald by naming its new wireless networking standard after him. It convinced founding Special Interest Group co-partners Nokia, Toshiba, IBM and Intel that Bluetooth was the right name for the thing and, together, they set off to conquer the air.


Introduction:
- Bluetooth uses a radio technology called frequency-hopping spread spectrum, which chops up the data being sent and transmits chunks of it on up to 79 bands (1 MHz each) in the range 2402-2480 MHz. This range is in the globally unlicensed Industrial, Scientific and Medical (ISM) 2.4 GHz short-range radio frequency band.
- Bluetooth provides a secure way to connect and exchange information between devices such as faxes, mobile phones, telephones, laptops, personal computers, printers, Global Positioning System (GPS) receivers, digital cameras, and video game consoles.
- The Bluetooth specifications are developed and licensed by the Bluetooth Special Interest Group (SIG). The Bluetooth SIG consists of more than 13,000 companies in the areas of telecommunication, computing, networking, and consumer electronics.


What is Bluetooth?
Developed by engineers at Ericsson in the late 1990s, Bluetooth is an increasingly popular technology that enables short-range wireless communication between a variety of electronic devices. Its most significant feature is that it allows devices to "talk" (transfer and synchronize data) wirelessly with one another, eliminating the need for the seemingly endless tangle of cords, cables, and adapters necessary for a lot of today's technology.
The Bluetooth Special Interest Group (SIG) was founded in 1998 to oversee the development and introduction of Bluetooth technology. Intel, IBM, Nokia, and Toshiba joined Ericsson as the founding members of the SIG, and more than 8,000 companies have signed on since.
In order to sell products with the Bluetooth specification and logo, manufacturers must be members of the SIG and the devices must meet well-outlined qualifications. These guidelines ensure that Bluetooth wireless devices worldwide can communicate with one another, regardless of manufacturer or country of origin.



Bluetooth vs. Wi-Fi IEEE 802.11 in networking
Bluetooth and Wi-Fi have many applications: setting up networks, printing, or transferring files.
Wi-Fi is intended for resident equipment and its applications. The category of applications is outlined as WLAN, the wireless local area networks. Wi-Fi is intended as a replacement for cabling for general local area network access in work areas.
Bluetooth is intended for non-resident equipment and its applications. The category of applications is outlined as the wireless personal area network (WPAN). Bluetooth is a replacement for cabling in a variety of personally carried applications in any ambience and can also support fixed location applications such as smart energy functionality in the home (thermostats, etc.).