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Bluetooth

Bluetooth is used to connect and exchange information between digital devices like personal digital assistant (PDA), mobile phones, laptops, computers, printers, digital cameras via a secure and low-cost globally available short range radio-frequency. Bluetooth is used in wireless personal area network (PAN). Bluetooth connection and information exchange can only occur if the two devices can be brought in range to each other.

A Bluetooth device can have two roles while communication takes place, master and slave. A Bluetooth device playing the role of master can communicate up to seven devices playing the role of slave. At any time, data can be transferred from master device to one slave at a time. Communicating with multiple slave devices, a master device switches from slave to slave in a technique called round-robin. This group of eight devices in communication is then called as piconets. The Bluetooth specification also permits connectivity between two or more piconets referred to as scatternet. In scatternet, some devices perform as bridge between piconets by playing a role of master in one piconet and a role of slave in another piconet simultaneously.  However, scatternet devices are not available in the market yet.


Pairs of devices may establish a trusted relationship by learning (by user input) a shared secret known as a passkey. A device that wants to communicate only with a trusted device can cryptographically authenticate the identity of the other device. Trusted devices may also encrypt the data that they exchange over the air so that no one can listen in.

 A bluetooth device must interpret certain possible applications called profiles. Profiles defined by Bluetooth SIG are: Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP), Basic Imaging Profile (BIP), Basic Printing Profile (BPP), Common ISDN Access Profile (CIP), Cordless Telephony Profile (CTP), Dial-up Networking Profile (DUN), Fax Profile (FAX), File Transfer Profile (FTP), General Audio/Video Distribution Profile (GAVDP), Generic Access Profile (GAP), Generic Object Exchange Profile (GOEP), Hands Free Profile (HFP), Hard Copy Cable Replacement Profile (HCRP), Headset Profile (HSP), Human Interface Device Profile (HID), Intercom Profile (ICP), Object Push Profile (OPP), Personal Area Networking Profile (PAN), Serial Port Profile (SPP), Service Discovery Application Profile (SDAP), SIM Access Profile (SAP), Synchronisation Profile (SYNCH) and Video Distribution Profile (VDP).

 

 

 

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