October 31, 2016
Categorised in: Data Communicaiton & Wireless Sensor Networks
Bluetooth is a standard developed by a group of electronics manufacturers that will allow any sort of electronic equipment — from computers and cell phones to keyboards and headphones — to make its own connections, without wires, cables or any direct action from a user.
A key difference with other existing wireless technologies is that bluetooth enables combined usability models based on functions provided by different devices.
The Bluetooth Special Interest Group comprises more than 1000 companies.The major companies who created the technology include
- 3 com
The Name – Bluetooth?
The name is attributed to Harald Bluetooth was king of Denmark around the turn of the last millennium.
Choosing this name for the standard indicates how important companies from the Baltic region (nations including Denmark, Sweden, Norway and Finland) are to the communications industry
More on Bluetooth
Present wireless technology like infra red data communication has two problems –1)Line of Sight 2) One to One
Using data synchronizing– e.g. hot syn on a PDA — problem of using the right support and cable.
BLUETOOTH OVERCOMES THESE PROBLEMS
It provides agreement at the physical level —
Bluetooth is a radio-frequency standard.
Provides agreement at the data link level where products have to agree on
- when bits are sent
- how many will be sent at a time
- how the parties in a conversation can be sure that the message received is the same as the
Bluetooth is a standard for a small , cheap radio chip to be plugged into computers, printers, mobile phones, etc
Bluetooth chip is designed to replace cables.Information normally carried by the cable, is transmitted at a special frequency to a receiver Bluetooth chip.
These devices can form a quick ad-hoc secure
“piconet” and start communication.
Connections in the “piconets” can occur even when mobile.
A collection of devices connected via Bluetooth
technology in an ad hoc fashion.
A piconet starts with two connected devices, and may grow to eight connected devices.
All Bluetooth devices are peer units and have identical implementations. However, when establishing a piconet, one unit will act as a Master and the other(s) as slave(s) for the duration of the piconet connection.
Low cost as cables – chip $5
Secure as cables – must support authentication and encryption
Must support both data and voice.
Must connect to a variety of devices.
Must be able to function in a noisy environment.
Data rates – 721kbps , using the 2.45Ghz radio frequency
band –I.S.M (Industrial, scientific and medical)
Must support many simultaneous and private “piconets”.
Must be low power, compact and global.