Bluetooth technology

  • The bluetooth is a wireless technology used for transferring the data from one device to other device 
  • The distance between the 2 devices is very short from the fixed mobile device and building personal area network. 
  • The bluetooth technology is developed by the bluetooth special interest group and its physical range is from 10m to 100m.
  • The bluetooth device can connect up to seven devices and it is used in the industry like smart phones, personal computers  and gaming consoles etc.
  • The IEEE standardized bluetooth as IEEE 802.15.1 But the standards are maintained for short periods. 
  • working of Bluetooth 
  • the bluetooth network has a personal area network or pinconet which contains 2-8 bluetooth per devices generally a single master and up to 7 slaves.
  • A single master is a bluetooth device it communicated with other devices. 
  • It has governed the communication link and traffic between itself and slave devices are associated with it.
  • The slave device is also a device and it is responded to the master devices. 
  • Slave devices are required to synchronize their transmit or receive timing with that of the masters.
  • In addition transmission by slave devices are governed by the master device. 
  • Specifically a slave may only begin its transmission in a time slot immediately following the time slot in which it was addressed by the master or in a time slot explicitly reserved for use by the slave device 
  • The frequency hopping sequence is defined by the bluetooth device  address of the master device. 
  • The master device first sends a radio signal asking for a response from the particular slave devices within the range of addresses. 
  • The slaves respond and synchronize their hop frequency as well as the clock with that of the master device.
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