1. Abdul Rahman Al-Refai Zavnura Pingkan

2. Introduction Bluetooth is a wireless technology for short range data and/ or voice communication The communication range is 10 meters, with a 100 meter version planned The bandwidth is 1MBit/ s, with a maximum user data speed of 723 KBit/ s Can be operated in point- to- point or networked mode

3. Goals How Bluetooth works? Why do we need it ?

4. Characteristics Bluetooth operates in the free 2.4GHz ISM (Industrial,Scientific, Medical) microwave band The radio frequency is changed 1600 times/ second (frequency hopping) over 79 channels The frequency hopping algorithm is ”random”, based on the master address and the current time All 79 channels (which are 1MHz apart) are visited before a channel is re- used

5. Topology a) Point- to- point: 2 Bluetooth devices communicate directly b) Pico- net: 8 Bluetooth devices can communicate in a small network c) Scatternet: Piconets can be connected to form larger networks

6. Piconets A Piconet has one master (M) and maximum 7 active slaves (S) A Piconet can have up to 255 inactive parked (P) slaves that belong to the network but are idle All slaves in the network follow the frequency hopping algorithm defined by the master

7. Scatternets Piconets can be connected to form a larger network (a scatter- net) Scatter- nets can be connected by having: Several masters connected to the same slave A master being slave in another network

8. System Architecture

9. Bluetooth Protocol Stack

10. Applications Get rid messy wires Connecting easily Efficient

11. Conclusion  Plug n Play  Robustness  Low complexity  Low power: battery powered  Low cost: about $5

12. Questions?