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BlueTooth

Bluetooth is a radio standard and communications protocol primarily designed for low power consumption, with a short range based on low-cost transceiver microchips in each device.

Tracy Pettigrue
Tracy Pettigrue
Sep 28, 2009
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Bluetooth is an industrial specification for wireless personal area networks. It provides a way to connect and exchange information between devices such as mobile phones, laptops, PCs, printers, digital cameras, and video game consoles over a secure, globally unlicensed short-range radio frequency. The Bluetooth specifications are developed and licensed by the Bluetooth Special Interest Group.

 
Bluetooth is a radio standard and communications protocol primarily designed for low power consumption, with a short range based on low-cost transceiver microchips in each device. Bluetooth enables these devices to communicate with each other when they are in range. The devices use a radio communications system, so they do not have to be in line of sight of each other, and can even be in other rooms, as long as the received transmission is powerful enough.
 
 

Version
Data Rate
Version 1.2
1 Mbit/s
Version 2.0 + EDR
3 Mbit/s
WiMedia Alliance
(proposed)
53 - 480 Mbit/s

Class
Maximum Permitted Power
(mW/dBm)
Range
(approximate)
Class 1
100 mW (20 dBm)
~100 meters
Class 2
2.5 mW (4 dBm)
~10 meters
Class 3
1 mW (0 dBm)
~1 meter

 

 

 

 
 
Technical Info:
A master Bluetooth device can communicate with up to seven devices. This network group of up to eight devices is called a piconet. A piconet is an ad-hoc computer network, using Bluetooth technology protocols to allow one master device to interconnect with up to seven active devices. Up to 255 further devices can be inactive, or parked, which the master device can bring into active status at any time.
At any given time, data can be transferred between the master and one other device, however, the devices can switch roles and the slave can become the master at any time. The master switches rapidly from one device to another in a round-robin fashion. Simultaneous transmission from the master to multiple other devices is possible, but not used much.
Bluetooth specification allows connecting two or more piconets together to form a scatternet, with some devices acting as a bridge by simultaneously playing the master role and the slave role in one piconet.
Any Bluetooth device will transmit the following sets of information on demand:
  • Device name.
  • Device class.
  • List of services.
  • Technical information, for example, device features, manufacturer, Bluetooth specification, clock offset.
Every device has a unique 48-bit address. However these addresses are generally not shown in inquiries. Instead, friendly Bluetooth names are used, which can be set by the user. This name appears when another user scans for devices and in lists of paired devices.
Author's note: Blue Tooth
Keywords: Bluetooth is a radio standard and communications protocol primarily designed for low power consumption, with a short range based on low-cost transceiver microchips in each device.



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