bluetooth technology new
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Bluetooth Technology
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Introduction
Bluetooth is a wireless technology for creating personal
networks operating in the 2.4 GHz unlicensed band, with
a range of 10 meters.
Bluetooth is a high
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speed, low
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power microwave wirelesslink technology.
Designed to connect phones, laptops, PDAs and other
portable equipment together with little or no work by the
user.
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History
Started in 1994 by Ericsson Mobile
Communication.
Low-power radio interface.
1998, the Bluetooth SIG was formed.
1999, companies like Microsoft, 3 Com,
Motorola and Lucent joined the SIG.
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Name
The heart of the Bluetooth brand identity is the
name
Which refers to the Danish king Harald
Bluetooth
In the beginning of the Bluetooth wireless
technology era, Bluetooth was aimed at unifying
the telecom and computing industries.
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Logo
A Scandinavian firm originally designed the logo.
The logo unites the Runic alphabetic characters
"H", which looks similar to an asterisk.
"B", which are the initials for Harald Bluetooth.
If you look close enough you can see both
embodied in the logo.
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Users
Bluetooth is a standard and a communicationsprotocol primarily designed for low power
consumption, with a short range.
Readily available in most modern mobile phonesand laptop computers.
Also used with accessories such as wireless
headphones and gaming controllers, etc.
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Bluetooth Protocol
Extends upto 10 metres.
Uses globally available 2.4GHz ISM band.
79 channels of 1MHz each.
Hop frequency is 1600 hops/second.
Uses ARQ, CRC, FEH for reliability.
Each device identified with 48bit unique address(IEEE 802)
Follows a strict master-slave scheme Master can have up to 7 active slaves connected
in a piconet
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Bluetooth devices
Bluetooth Dongle
Bluetooth Headset
Bluetooth mouse Key board
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1999 - Bluetooth 1.0 Specification is introduced.
2003 Version 2.1.
2004 Bluetooth Version 2.0 + EDR (Enhanced Data Rate)
2005 Devices using Version 2.0 + EDR
2007 Bluetooth Core Specification Version 2.1 + EDR
2009 Bluetooth Core Specification Version 3.0 + HS (High Speed)
Bluetooth versions
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Security Overview
In Bluetooth, key generation is generally basedon a Bluetooth PIN, which must be entered into
both devices.
This procedure might be modified if one of thedevices has a fixed PIN
During pairing, an initialization key or master key
is generated, using the E22 algorithm
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Health concerns
Bluetooth uses the microwave radio frequencyspectrum in the 2.4 GHz to 2.4835 GHz range.
Maximum power output from a Bluetooth radio is
100 mW, 2.5 mW, and 1 mW for Class 1, Class 2,and Class 3.
Accordingly, Class 2 and Class 3 Bluetooth devices
are considered less of a potential hazard thanmobile phones.
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Advantages
No line of site restrictions as with IrDA.Low power consumption makes integrated inbattery powered devices very practical.
2.4 GHz radio frequency ensures worldwideoperability.
Qualification program ensures that productsdisplaying the Bluetooth logo have been tested to
meet stringent expectations for ease of use.Tremendous momentum not only within thecomputer industry but other industries like cellular
telephones and transportation.
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Disadvantages
Early stages of development make Bluetooth an
immature technology that will need to prove itself
Bluetooth shares the same frequency range as
802.11b Wireless LAN products (i.e. 2.4GHz)
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Problems
Vulnerable to Bluesnarfing, Blue jacking,
Wireless networks open pathways for security
breaches.
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