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Bluetooth
Unlike many other wireless standards, the Bluetooth wireless specification
includes both link layer and application layer definitions for product
developers which supports data, voice, and content-centric applications.
Radios that comply with the Bluetooth wireless specification operate
in the unlicensed, 2.4 GHz radio spectrum ensuring communication
compatibility worldwide. These radios use a spread spectrum, frequency
hopping, full-duplex signal at up to 1600 hops/sec. The signal hops
among 79 frequencies at 1 MHz intervals to give a high degree of
interference immunity. The Bluetooth network consists of two types
of devices, a master and a slave, whereby the communications between
devices can only be initiated by a master. There after both devices
can talk freely to each other until they disconnect. Up to seven
simultaneous connections can be established and maintained.
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