What is Bluetooth?
Bluetooth™ refers to
an open specification for a technology to enable short-range wireless
voice and data communications anywhere in the world. The Bluetooth SIG
(Special Interest Group) is an industry group, driving the development
of the technology and bringing it to market. The founding SIG members
are Ericsson, Intel, IBM, Nokia, and Toshiba.
Bluetooth uses the
2.40 to 2.48 GHz ISM (Industrial, Scientific, Medical) band, which provides
unlicensed radio frequencies. As the frequencies are unlicensed and are
available in most areas of the world, virtually anyone can set up Bluetooth
coverage in almost any area. Bluetooth uses spread spectrum, frequency hopping,
full-duplex signal at a rate of 1600 hops/sec with the range of about 10 meters
to around 100 meters radio link which can transmit a maximum capacity of 720
kilobits per second per channel.
The signal hops among
79 frequencies at 1 MHz intervals to give a high degree of
interference immunity. The RF output of a Bluetooth device is
specified as 0 dBm (1 mW) in the 10m-range version and -30 to +20 dBm
(100 mW) in the longer range version.
Bluetooth is designed
to operate in an environment of many users. Up to eight Bluetooth
devices can communicate in a small network called a piconet. Multiple
piconets can coexist in the same coverage range of the Bluetooth
radio. To provide security, each link is encoded and protected against
eavesdropping and interference.
support for three general application areas using short-range wireless
Bluetooth facilitates real-time voice and data transmissions by
providing effortless wireless connection of portable and stationary
A device equipped with a Bluetooth radio can
establish instant connection to another Bluetooth radio as soon as
it comes into range.
Bluetooth eliminates wires and cables between
both stationary and mobile devices.
information refer to