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Bluetooth operates in the 2.45 GHz wireless spectrum band. This range is called the ISM (Industrial,Scientific and Medical) band.World-wide this spectrum range does not require the consumer to get a license and is shared by many cordless telephones and wireless LAN products.
Bluetooth uses the radio waves located in the frequency band of 2.4 GHz. In this band, Bluetooth transmits voice and data at flows lower than 1mbps.Bluetooth devices can function in following two modes:
Circuit switched : Mode for voice communications on land and wireless digital networks and the connection is asynchronous with flow of 57.6 to 721 kbps.
Packet switched : Mode for internet data ,as well as for higher bandwidth mobile communication systems on the horizon ,like GPRS and the connection is synchronous with flow of 64 kbps.
Frequency hopping is the jumping from frequency to frequency within the ISM band.After a Bluetooth device sends or receives a packet, it communicates with “hop” to another frequency before the next packet is sent. This scheme has the following advantages :
It allows Bluetooth devices to use the entirely of the available ISM band.
It ensures that any interference will be a short-lived.
Any packet that doesn’t arrive safely at the destination can be re-sent at the next frequency.
Bluetooth wireless technology is the simple choice for convenient, wire-free, short-range communication between devices. It is a globally available standard that wirelessly connects mobile phones, portable computers, cars, stereo headsets, MP3 players, and more. Bluetooth enabled products do not need to install driver software. The technology is now available in its fourth version of the specification and continues to develop, building on its inherent strengths — small-form factor radio, low power, low cost, built-in security, robustness, ease-of-use, and ad hoc networking abilities.
Bluetooth wireless technology is the leading and only proven short-range wireless technology on the market today shipping over five million units every week .