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Blue tooth


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Blue tooth

  2. 2. WHAT IS BLUETOOTH? Bluetooth is an open wireless protocol for exchanging data over short distance using short length radio waves from fixed and mobile devices creating a personal area network. It can connect several devices overcoming problems of synchronization. It is high speed ,low power microwave wireless link technology.
  3. 3. WHY THIS NAME? Danish Harald Blåtand was the King of Denmark between 940 and 985 AD. He united Denmark and Norway, so same way Bluetooth of today will unite the worlds of computers and telecom.
  4. 4. IMPLEMENTATION Bluetooth uses a radio technology called frequency hopping spread spectrum, which chops up data being sent and transmits it. It operates at 2.4 Ghz and is capable of transmitting voice and data. The effective range of bluetooth device is 32 feet(10 mts). It transfers at the rate of 1 Mbps which is 3 to 8 times the avg speed of parallel and serial ports. It is also known as IEEE 802.15 standards.
  5. 5. FREQUENCY HOPPING SPREADSPECTRUM In this modulation technique frequencies are switched repeatedly during radio transmission. It reduces interference with other devices 1600 hops/sec- time slot is defined as 625 microseconds Pseudorandom hopping
  6. 6.  Bluetooth is a packet based protocol with master slave structure One master may communicate with upto 7 slaves in a piconet All devices share the masters clock The master clock ticks at312.5micro sec intervals Two clock ticks make up a slot of 625 micro sec
  7. 7. CNTD. The master transmits in even slots and receives in odd slots Where as the slave receives in even slots and transmits in odd slots Packets may be 1,3 or 5 slots long
  8. 8. CLASSIFICATION Classification of devices on the basis of Power dissipated & corresponding maximum Range. Class Max Power Range permitted( (dbm) (approx) mw) Class 1 100 20 ~100mts Class 2 2.5 4 ~10mts Class 3 1 0 ~1mt
  9. 9. TECHNICAL FEATURES Spread Spectrum (Frequency Hopping) &Connection Type Time Division Duplex (1600 hops/sec) 2.4 GHz ISM Open Band (79 MHz ofSpectrum spectrum = 79 channels)Modulation Gaussian Frequency Shift KeyingTransmission Power 1 mw – 100 mwData Rate 1 MbpsRange 30 ftSupported Stations 8 devicesData Security –Authentication Key 128 bit keyData Security –Encryption Key 8-128 bits (configurable)Module size 9 x 9 mm
  10. 10. TYPICAL BLUETOOTH SCENARIO• Bluetooth will support wireless point-to-point and point-to-multipoint (broadcast) between devices in a piconet.• Point to Point Link m s — Master - slave relationship — Bluetooth devices can function as masters or slaves• Piconet — It is the network formed by a Master and one or m more slaves (max 7) — Each piconet is defined by a different hopping channel to which users synchronize to s s s — Each piconet has max capacity (1 Mbps)
  11. 11. AD-HOC NETWORK• Inter-piconet communication• Up to 10 piconets in a scatternet• Multiple piconets can operate within same physical space• This is an ad-hoc, peer to peer (P2P) network
  12. 12. PACKET STRUCTURE 72 bits 54 bits 0 - 2744 bits Access Header Payload Code Voice header Data CRC
  13. 13. CHANNEL ESTABLISHMENT• There are two managed situations — A device knows the parameters of the other – It follows paging process — No knowledge about the other – Then it follows inquiring & paging process• Two main states and sub-states — Standby (no interaction) — Connection (working) — Seven more sub-states for attaching slaves & connection establishment
  14. 14. CHANNEL ESTABLISHMENT (CONTD.) • Seven sub-states — Inquiry — Inquiry scan — Inquiry response — Page — Page scan — Master response — Slave response
  15. 15. USES Bluetooth is a standard communication protocol primarily designed for low power consumption Short range wireless solutions World wide usability Transfer of data as well as voice Wireless networking between PCs in a confined space and where little bandwidth is require
  18. 18. CORE BLUETOOTH PRODUCTS• Notebook PCs & • CD Player Desktop computers • TV/VCR/DVD• Printers• PDAs • Access Points• Other handheld • Telephone Answering devices Devices• Cell phones • Cordless Phones• Wireless peripherals: • Cars • Headsets • Cameras
  19. 19. SUMMARY• A new global standard for data and voice• Eliminate Cables• Low Power, Low range, Low Cost network devices• Future Improvements — Master-Slave relationship can be adjusted dynamically for optimal resource allocation and utilization. — Adaptive, closed loop transmit power control can be implemented to further reduce unnecessary power usage.