28-07-2012, 11:57 AM
BLUETOOTH
BLUETOOTH.ppt (Size: 308.5 KB / Downloads: 137)
WHAT IS BLUETOOTH
Bluetooth is a new 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
Intel
3 com
Ericcson
IBM
Motorola
Nokia
Toshiba
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
The Basic Idea
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.
“Piconet”
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.
Spread-Spectrum frequency hopping
A device will use 79 individual randomly chosen frequencies within a designated range, changing from one to another on a regular basis.
The designated range is from 2.402GHz to 2.480GHz, in steps of 1MHz.
The frequency hopping is done at a rate of 1600 times a second.
This allows more devices to use the limited time slice and secondly reduces the chance of two transmitters being on the same frequency at the same time.
Bluetooth Frame
Each frame consists of a transmit packet and a receive packet.
Each packet may have either 1, 3 or 5 slots of 625ùs.
Single slot packet – max data rate of 172Kbps
Multislot frames support higher rates– 721Kbps or a max. of 3 voice channels.
BLUETOOTH.ppt (Size: 308.5 KB / Downloads: 137)
WHAT IS BLUETOOTH
Bluetooth is a new 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
Intel
3 com
Ericcson
IBM
Motorola
Nokia
Toshiba
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
The Basic Idea
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.
“Piconet”
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.
Spread-Spectrum frequency hopping
A device will use 79 individual randomly chosen frequencies within a designated range, changing from one to another on a regular basis.
The designated range is from 2.402GHz to 2.480GHz, in steps of 1MHz.
The frequency hopping is done at a rate of 1600 times a second.
This allows more devices to use the limited time slice and secondly reduces the chance of two transmitters being on the same frequency at the same time.
Bluetooth Frame
Each frame consists of a transmit packet and a receive packet.
Each packet may have either 1, 3 or 5 slots of 625ùs.
Single slot packet – max data rate of 172Kbps
Multislot frames support higher rates– 721Kbps or a max. of 3 voice channels.