Friday, April 19, 2013

What is Bluetooth


Bluetooth is the name of a wireless technology that is standard for connecting devices
without cables. Bluetooth works by using radio signals to transmit information over short distances
that are generally 33 feet or less. Thus Bluetooth is a technology that allows for short distance
wireless data transmission. It is used most commonly in phones for peripheral devices like
headsets.
Created by telecoms vendor Ericsson in 1994,[1] it was originally conceived as a wireless
alternative to RS-232 data cables. It can connect several devices, overcoming problems of
synchronization.
Bluetooth provides a secure way to connect and exchange information between devices
such as faxes, mobile phones, telephones, laptops, personal computers, printers, Global Positioning
System (GPS) receivers, digital cameras, and video game consoles.
List of applications (Uses)
A typical Bluetooth mobile phone headset.
 Wireless control of and communication between a mobile phone and a hands free headset.
This was one of the earliest applications to become popular.
 Wireless control of and communication between a mobile phone and a Bluetooth compatible
car stereo system
 Wireless Bluetooth headset and Intercom.
 Wireless networking between PCs in a confined space and where little bandwidth is
required.
 Wireless communication with PC input and output devices, the most common being the
mouse, keyboard and printer.
 Transfer of files, contact details, calendar appointments, and reminders between devices
with OBEX.
 Replacement of previous wired RS-232 serial communications in test equipment, GPS
receivers, medical equipment, bar code scanners, and traffic control devices.
 For controls where infrared was often used.
 For low bandwidth applications where higher USB bandwidth is not required and
cable-free connection desired.

 Sending small advertisements from Bluetooth-enabled advertising hoardings to other,
discoverable, Bluetooth devices.
 Wireless bridge between two Industrial Ethernet (e.g., PROFINET) networks.
 Three seventh-generation game consoles, Nintendo's Wii and Sony's PlayStation 3 and PSP
Go, use Bluetooth for their respective wireless controllers.
 Dial-up internet access on personal computers or PDAs(Personal Digital Assistants) using
a data-capable mobile phone as a wireless modem.
 Short range transmission of health sensor data from medical devices to mobile phone,
set-top box or dedicated tele-health devices.
 Allowing a DECT phone to ring and answer calls on behalf of a nearby mobile phone
 Real-time location systems (RTLS), are used to track and identify the location of objects in
real-time using “Nodes” or “tags” attached to, or embedded in the objects tracked, and
“Readers” that receive and process the wireless signals from these tags to determine their
locations.
 Personal security application on mobile phones for prevention of theft or loss of items. The
protected item has a Bluetooth marker (e.g. a tag) that is in constant communication with
the phone. If the connection is broken (the marker is out of range of the phone) then an
alarm is raised. This can also be used as a man overboard alarm. A product using this
technology has been available since 2009.
Bluetooth exists in many products, such as the iPod Touch, Lego Mindstorms NXT, Play
Station 3, PSP Go, telephones, the Nintendo Wii, and some high definition headsets, modems, and
watches. The technology is useful when transferring information between two or more devices that
are near each other in low-bandwidth situations. Bluetooth is commonly used to transfer sound
data with telephones (i.e., with a Bluetooth headset) or byte data with hand-held computers
(transferring files).

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