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Bluetooth - General Questions / FAQs
Bluetooth - General Questions / FAQs.
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Bluetooth Implementation
Discussions related to Bluetooth Implementation. 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 frequencies. In its basic mode, the modulation is Gaussian frequency-shift keying (GFSK).
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Bluetooth Uses
Discussions related to Bluetooth Uses. Bluetooth 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.
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Bluetooth Applications
Discussions related to Bluetooth Applications. More prevalent applications of Bluetooth include:
Wireless control of and communication between a mobile phone and a hands-free headset. This was one of the earliest applications to become popular. Wireless networking between PCs in a confined space and where little bandwidth is required.
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Bluetooth Technology & Features
Discussions related to Bluetooth Technology & Features. The Bluetooth specification was developed in 1994 by Jaap Haartsen and Sven Mattisson, who were working for Ericsson Mobile Platforms in Lund, Sweden. The specification is based on frequency-hopping spread spectrum technology.
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Bluetooth Security
Bluetooth implements confidentiality, authentication and key derivation with custom algorithms based on the SAFER+ block cipher. In Bluetooth, key generation is generally based on a Bluetooth PIN, which must be entered into both devices.
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Bluetooth Health Concerns
Bluetooth uses the microwave radio frequency spectrum in the 2.4 GHz to 2.4835 GHz range. Maximum power output from a Bluetooth radio is 100 mW, 2.5 mW, and 1 mW for Class 1, Class 2, and Class 3 devices respectively, which puts Class 1 at roughly the same level as mobile phones, and the other two classes much lower.
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