Bluetooth is a mechanism used for the interconnection of computing and communication devices and accessories. The technology was first developed by Ericsson in the year 1994. The fundamental unit of a Bluetooth system is called piconet. Piconet consists of a master node and some active slave nodes within a distance of 5-10 meters. There can be upto seven active slave nodes. Scatternet is a system of interconnected piconets. A piconet contains upto seven active slave nodes and upto 255 parked nodes. These parked nodes have to switch to low-power state for reducing the drain on batteries. The master block of piconet system controls the clock and determines the device for communication and time slot. Only master-slave communication is possible here and the slave-slave communication is forbidden. Blouetooth profiles or applications are generic access, LAN access, intercom, FAX, dial-up networking, file transfer, synchronization, service discovery, cordless telephony, serial port, generic object exchange, headset and object push.
