what is bluetooth and its full information?

Question

development of bluetooth technology , features of bluetooth and its application

Answer 1

Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth 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 (power-class-dependent: 1 metre, 10 metres, 100 m) based on low-cost transceiver microchips in each device.

Bluetooth lets these devices 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.

In order to use Bluetooth, a device must be compatible with certain Bluetooth profiles. These define the possible applications and uses.

List of applications
**********************
More prevalent applications of Bluetooth include:

-Wireless control of and communication between a cell phone and a hands-free headset or car kit. This was one of the earliest applications to become popular.
-Wireless networking between PCs in a confined space and where little bandwidth is required.
-Wireless communications with PC input and output devices, the most common being the mouse, keyboard and printer.
-Transfer of files between devices with OBEX.
-Transfer of contact details, calendar appointments, and reminders between devices with OBEX.
-Replacement of traditional wired serial communications in test equipment, GPS receivers, medical equipment and traffic control devices.
-For controls where infrared was traditionally used.
-Sending small advertisements from Bluetooth enabled advertising hoardings to other, discoverable, Bluetooth devices.
-Seventh-generation game consoles—Nintendo Wii[2], Sony PlayStation 3—use Bluetooth for their respective wireless controllers.

Bluetooth is implemented in a variety of new products such as phones, printers, modems, and headsets. Bluetooth is acceptable for situations when two or more devices are in proximity to each other and don't require high bandwidth. Bluetooth is most commonly used with phones and hand-held computing devices, either using a Bluetooth headset or transferring files from phones/PDAs to computers.

Bluetooth also simplifies the discovery and setup of services. Bluetooth devices advertise all services they provide. This makes the utility of the service that much more accessible, without the need to worry about network addresses, permissions and all the other considerations that go with typical networks.

Bluetooth Development
***************************
The Bluetooth specification was developed in 1994 by Sven Mattisson and Jaap Haartsen, who were working for Ericsson Mobile Platforms in ****, Sweden.The specifications were formalized by the Bluetooth Special Interest Group (SIG). The SIG was formally announced on May 20, 1998. Today it has over 7000 companies worldwide. It was established by Ericsson, Sony Ericsson, IBM, Intel, Toshiba, and Nokia, and later joined by many other companies. Bluetooth is also known as IEEE 802.15.1.

Bluetooth challenges
************************

Bluetooth has several positive features and one
would be extremely hard pressed to find downsides
when given the current competition. The only real
downsides are the data rate and security. Infrared
can have data rates of up to 4 MBps, which provides
very fast rates for data transfer, while Bluetooth
only offers 1 MBps.

For this very reason, infrared has yet to be
dispensed with completely and is considered by
many to be the complimentary technology to that
of Bluetooth. Infrared has inherent security due
to its line of sight.

The greater range and radio frequency (RF) of
Bluetooth make it much more open to interception and
attack. For this reason, security is a very key
aspect to the Bluetooth specification.

For more bluetooth info-
http://www.bluetooth.com/
http://en.wikipedia.org/wiki/Bluetooth
http://electronics.howstuffworks.com/bluetooth.htm
http://www.wirelessdevnet.com/channels/bluetooth/features/bluetooth.html

Answer 2

http://bluetooth.com/Bluetooth/Press/Media/Kit/Technical/

Answer 3

Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth 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.

Connect Wirelessly

At Home
Extend technology outside of the domestic office into other areas of your home. Create a wireless surround sound system, send pictures straight from your Bluetooth mobile device to your Bluetooth printer, or just decrease the clutter of cables in your home office.

At Work
Today, with Bluetooth wireless technology, the office can be a sleek, organized machine, with fewer wires in sight. PDAs sync with computers to share calendars and contact lists, peripherals communicate directly with computers ,and Bluetooth headsets allow phone use throughout an office space, all without connecting a single wire.

In Motion
Bluetooth technology provides the personal connectivity to access important information and communicate while on the move. Continuous access and communication is expected in this fast-paced world. New devices and technologies are coming to market to ensure better mobile connection and Bluetooth wireless technology is often the standard making personal wireless connectivity a reality.

At Play
Bluetooth wireless technology is the best wireless technology that makes wireless fun a reality. Gaming devices with Bluetooth technology built in allow for the spirit of competition to take hold in any location. Because no wires are required, gamers can find each other easily – even anonymously – and strike up a friendly game.

Mobile Device
With Bluetooth technology your mobile device is capable of a lot more than you might realize. We all know you can connect wirelessly to a Bluetooth headset to chat hands free, but did you also know that you can wirelessly print your favorite pictures from your camera phone straight to a Bluetooth enabled printer? No need for any cables or even a PC! But you can also transfer images, contacts and calendar information between your PC and mobile device with ease.

There's more to experience with your mobile device and Bluetooth technology.

Laptop and PC
There are more connections that you're not making. With Bluetooth technology your PC and laptop will connect to a number of devices that will help organize and streamline your work space. In addition to a wireless keyboard and mouse, that will decrease the clutter on your desktop, you can also transfer files between two laptops with ease, or click through a presentation without ever walking over to your laptop. Transfer images, contacts and calendar information to your mobile device and never a miss a beat between the office, travel and home.

Experience more with your laptop and PC now.

Car
With the increased amount of time you spend in your car these days, staying connected to your life must be easier. With the many devices to choose from to talk hands free, be it a headset, car kit or speaker phone, keeping your hands on the wheel is easier than ever. But there's more that Bluetooth technology is helping you do while on the move: listen to your iPod through your car stereo, have a GPS send updates to your PDA or laptop, and more.

Learn more about how Bluetooth technology will help you experience more in your car.

There are lots of different ways that electronic devices can connect to one another. For example:

* Component cables
* Electrical wires
* Ethernet cables
* WiFi
* Infrared signals

When you use computers, entertainment systems or telephones, the various pieces and parts of the systems make up a community of electronic devices. These devices communicate with each other using a variety of wires, cables, radio signals and infrared light beams, and an even greater variety of connectors, plugs and protocols.

The art of connecting things is becoming more and more complex every day. In this article, we will look at a method of connecting devices, called Bluetooth, that can streamline the process. A Bluetooth connection is wireless and automatic, and it has a number of interesting features that can simplify our daily lives.
The Problem

When any two devices need to talk to each other, they have to agree on a number of points before the conversation can begin. The first point of agreement is physical: Will they talk over wires, or through some form of wireless signals? If they use wires, how many are required -- one, two, eight, 25? Once the physical attributes are decided, several more questions arise:

* How much data will be sent at a time? For instance, serial ports send data 1 bit at a time, while parallel ports send several bits at once.

* How will they speak to each other? All of the parties in an electronic discussion need to know what the bits mean and whether the message they receive is the same message that was sent. This means developing a set of commands and responses known as a protocol.

Bluetooth offers a solution to the problem.

Why is it called Bluetooth?
Harald Bluetooth was king of Denmark in the late 900s. He managed to unite Denmark and part of Norway into a single kingdom then introduced Christianity into Denmark. He left a large monument, the Jelling rune stone, in memory of his parents. He was killed in 986 during a battle with his son, Svend Forkbeard. Choosing this name for the standard indicates how important companies from the Nordic region (nations including Denmark, Sweden, Norway and Finland) are to the communications industry, even if it says little about the way the technology works.

How Bluetooth Operates
Bluetooth networking transmits data via low-power radio waves. It communicates on a frequency of 2.45 gigahertz (actually between 2.402 GHz and 2.480 GHz, to be exact). This frequency band has been set aside by international agreement for the use of industrial, scientific and medical devices (ISM).

A number of devices that you may already use take advantage of this same radio-frequency band. Baby monitors, garage-door openers and the newest generation of cordless phones all make use of frequencies in the ISM band. Making sure that Bluetooth and these other devices don't interfere with one another has been a crucial part of the design process.

One of the ways Bluetooth devices avoid interfering with other systems is by sending out very weak signals of about 1 milliwatt. By comparison, the most powerful cell phones can transmit a signal of 3 watts. The low power limits the range of a Bluetooth device to about 10 meters (32 feet), cutting the chances of interference between your computer system and your portable telephone or television. Even with the low power, Bluetooth doesn't require line of sight between communicating devices. The walls in your house won't stop a Bluetooth signal, making the standard useful for controlling several devices in different rooms.

Bluetooth can connect up to eight devices simultaneously. With all of those devices in the same 10-meter (32-foot) radius, you might think they'd interfere with one another, but it's unlikely. Bluetooth uses a technique called spread-spectrum frequency hopping that makes it rare for more than one device to be transmitting on the same frequency at the same time. In this technique, a device will use 79 individual, randomly chosen frequencies within a designated range, changing from one to another on a regular basis. In the case of Bluetooth, the transmitters change frequencies 1,600 times every second, meaning that more devices can make full use of a limited slice of the radio spectrum. Since every Bluetooth transmitter uses spread-spectrum transmitting automatically, it’s unlikely that two transmitters will be on the same frequency at the same time. This same technique minimizes the risk that portable phones or baby monitors will disrupt Bluetooth devices, since any interference on a particular frequency will last only a tiny fraction of a second.

When Bluetooth-capable devices come within range of one another, an electronic conversation takes place to determine whether they have data to share or whether one needs to control the other. The user doesn't have to press a button or give a command -- the electronic conversation happens automatically. Once the conversation has occurred, the devices -- whether they're part of a computer system or a stereo -- form a network. Bluetooth systems create a personal-area network (PAN), or piconet, that may fill a room or may encompass no more distance than that between the cell phone on a belt-clip and the headset on your head. Once a piconet is established, the members randomly hop frequencies in unison so they stay in touch with one another and avoid other piconets that may be operating in the same room. Let's check out an example of a Bluetooth-connected system.

Bluetooth profiles

Main article: Bluetooth profile

In order to use Bluetooth, a device must be compatible with certain Bluetooth profiles. These define the possible applications and uses.

[edit] List of applications

More prevalent applications of Bluetooth include:

* Wireless control of and communication between a cell phone and a hands-free headset or car kit. This was one of the earliest applications to become popular.
* Wireless networking between PCs in a confined space and where little bandwidth is required.
* Wireless communications with PC input and output devices, the most common being the mouse, keyboard and printer.
* Transfer of files between devices with OBEX.
* Transfer of contact details, calendar appointments, and reminders between devices with OBEX.
* Replacement of traditional wired serial communications in test equipment, GPS receivers, medical equipment and traffic control devices.
* For controls where infrared was traditionally used.
* Sending small advertisements from Bluetooth enabled advertising hoardings to other, discoverable, Bluetooth devices.
* Seventh-generation game consoles—Nintendo Wii[2], Sony PlayStation 3—use Bluetooth for their respective wireless controllers.
* Remote management of sex toys (see Bluedildonics, Teledildonics, Related articles [3][4][5][6])

[edit] Bluetooth vs. Wi-Fi in networking

Bluetooth and Wi-Fi both have their places in today's offices, homes, and on the move: setting up networks, printing, or transferring presentations and files from PDAs to computers.

[edit] Bluetooth

Bluetooth is implemented in a variety of new products such as phones, printers, modems, and headsets. Bluetooth is acceptable for situations when two or more devices are in proximity to each other and don't require high bandwidth. Bluetooth is most commonly used with phones and hand-held computing devices, either using a Bluetooth headset or transferring files from phones/PDAs to computers.

Bluetooth also simplifies the discovery and setup of services. Bluetooth devices advertise all services they provide. This makes the utility of the service that much more accessible, without the need to worry about network addresses, permissions and all the other considerations that go with typical networks.

[edit] Wi-Fi

Wi-Fi is more analogous to the traditional Ethernet network and requires configuration to set up shared resources, transmit files, set up audio links (for example, headsets and hands-free devices). It uses the same radio frequencies as Bluetooth, but with higher power output resulting in a stronger connection. Wi-Fi is sometimes called "wireless Ethernet." Although this description is inaccurate, it provides an indication of its relative strengths and weaknesses. Wi-Fi requires more setup, but is better suited for operating full-scale networks because it enables a faster connection, better range from the base station, and better security than Bluetooth.

One method for comparing the efficiency of wireless transmission protocols such as Bluetooth and Wi-Fi is spatial capacity, or bits per second per square meter.

Uses
A typical Bluetooth mobile phone headset
A typical Bluetooth mobile phone headset

Bluetooth is a radio standard and communications protocol primarily designed for low power consumption, with a short range (power-class-dependent: 1 metre, 10 metres, 100 m)[1] based on low-cost transceiver microchips in each device.

Bluetooth lets these devices 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.
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

Bluetooth Basics

Bluetooth wireless technology is a short-range communications technology intended to replace the cables connecting portable and/or fixed devices while maintaining high levels of security. The key features of Bluetooth technology are robustness, low power, and low cost. The Bluetooth specification defines a uniform structure for a wide range of devices to connect and communicate with each other.

Bluetooth technology has achieved global acceptance such that any Bluetooth enabled device, almost everywhere in the world, can connect to other Bluetooth enabled devices in proximity. Bluetooth enabled electronic devices connect and communicate wirelessly through short-range, ad hoc networks known as piconets. Each device can simultaneously communicate with up to seven other devices within a single piconet. Each device can also belong to several piconets simultaneously. Piconets are established dynamically and automatically as Bluetooth enabled devices enter and leave radio proximity.

A fundamental Bluetooth wireless technology strength is the ability to simultaneously handle both data and voice transmissions. This enables users to enjoy variety of innovative solutions such as a hands-free headset for voice calls, printing and fax capabilities, and synchronizing PDA, laptop, and mobile phone applications to name a few.