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Introduction to Bluetooth Technology

Introduction to Bluetooth Technology Presented by: Sachin Garg Table of Contents Introduction What is Bluetooth? Bluetooth basics Specifications Other Technology References Introduction

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Introduction to Bluetooth Technology

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  1. Introduction to Bluetooth Technology Presented by: Sachin Garg

  2. Table of Contents • Introduction • What is Bluetooth? • Bluetooth basics • Specifications • Other Technology • References

  3. Introduction • With IT boom, mobility among people has grown and technologies for voice and data communication evolved. • Countless electronic devices in market. • No widespread technology for connecting personal devices. • Demand for such a system. • Answer - Bluetooth wireless technology.

  4. What is Bluetooth • Bluetooth - standard developed by a group of electronics manufacturers - allows electronic equipments to make their own connections. • Standard at two levels: - Physical

  5. Bluetooth contd…. - Networking • Bluetooth Special Interest Group (SIG) - More than 1,000 companies - Aim to replace cables with Bluetooth's radio communications

  6. Bluetooth basics • Problems with current technologies • Infrared • Line of sight communication • One to one technology (no broadcasting) • Cable synchronizing • Correct cable or cradle needed • Bluetooth – solves these problems • Wireless • Inexpensive • Automatic - devices find each other • Operates at 2.45 GHz in the ISM band

  7. Basics continued…………… • Problem - avoid interference • Solution – • Transmitting weak signals of about 1 mW • Spread spectrum frequency hopping

  8. Specifications • Specification defines the requirements. • Requirements defined for two reasons: • Provide compatibility • Define Quality

  9. Specifications contd… • Specs • Devices in a piconet share a common communication data channel. Channel capacity is 1 Mbps. Headers and handshaking information consume 20 percent of this capacity. • United States and Europe: frequency range is 2.4- 2.483 GHz, with 79 1-MHz radio frequency (RF) channels. In practice, the range is 2,402 MHz to 2,480 MHz. Japan: frequency range is 2.472 – 2.497 GHz with 23 1-MHz RF channels. A data channel hops randomly 1,600 times per second between the 79 (or 23) RF channels. • Each channel is divided into time slots 625 microseconds long.

  10. Specs continued…….. • A piconet has a master and up to seven slaves. The master transmits in even time slots, slaves in odd time slots. • Packets can be up to five time slots wide. Data in a packet can be up to 2,745 bits in length. • Currently two types of data transfer between devices: SCO and ACL. • In a piconet, there can be up to three SCO links of 64 Kbps each. To avoid timing and collision problems, the SCO links use reserved slots set up by the master.

  11. Specs continued…….. • Masters support up to three SCO links with one, two or three slaves. • Slots not reserved for SCO links used for ACL links. • One master and slave can have a single ACL link. • ACL either point-to-point (master to one slave) or broadcast to all the slaves. • ACL slaves transmit only when requested by the master.

  12. Other Technology • Bluetooth Vs non line-of-sight technology

  13. Other Technology • Bluetooth Vs line-of-sight technology (IrDA) • IrDA is a point-to-point data transfer technology. • Ad-hoc data transmission standard designed to operate in a range of 0 to 1 meter and at speeds of 9600 bps to 16 Mbps. • No options for link level security implementations. • Widely available on laptop computers, embedded systems, peripherals etc.

  14. References • www.bluetooth.com • www.howstuffworks.com • www.123wapinfo.com • www.bluetoothcentral.com/faq_plain.html • www.irda.org/use/faq.asp

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