By: Trevor Parker, Minh-Tri Le

Bluetooth is a wireless technology that is a low-cost, low-power, short-range radio for ad-hoc wireless communication, were data or voice can be transmitted from a Master to slave module.

Bluetooth is named after a 10 th century Danish King Harald Blatand, who unified Denmark and Norway. In 1994 – Ericssons worked with the concept while studying wireless technology to link mobile phones In 1998 Bluetooth Special Interest Group (SIG) was formed Ericsson, Intel, IBM, Nokia, Toshiba In 1999 the First Specifications were released In 2001 the first retail products were sold

3 classes Class 3 – range: 1-3m Max power of 1mW Class 2 – range: 10-30m Max power of 2.5mW Class 1 – range: m Max power of 100mW Versions Version 1- Data rate: 1Mbit/s Newest version 4 – Data rate: +24Mbit/s Includes Bluetooth low energy(BLE) and highspeed

Several Bluetooth devices joined are called a piconet, normally up to a maximum of 8 devices. The main device acts as the master and every other device turns into a slave to it. Though in turn any of those devise could be the master to another set of slaves. This is called a scatternet.

PiconetScatternet

Longer encryption keys (128 bit key) Application encryptions Link authentication Personal Identification numbers Frequency hopping

Bluetooth uses Frequency Hopping, which reduces interference from things like microwaves and baby monitors The frequency hopping occurs 1600 times per sec TECHNOLOGY-ppt #

Channel is divided into consecutive slots (each 625 us) One packet can be transmitted per slot Subsequent slots are alternatively used for transmitting and receiving Master can send packets to a slave only in EVEN slots Slave can send packets to the master only in the ODD slots

LMP: control the radio link between two devices L2CAP: link the controller and allows interoperability between Bluetooth devices SDP: allows automatic detection of Bluetooth devices without affecting the other service discovery protocols RFCOMM: serial data transfer TCS: set up and control speech and data calls between Bluetooth devices

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