Few applications of bluetooth :

a.Wireless control of and communication between a cell phone and a hands free headset or car kit. This is the most popular use.

b.Wireless networking between PCs in a confined space and where little bandwidth is required.

c.Wireless communications with PC input devices such as mouses and keyboards and output devices such as printers.

d.Transfer of files between devices via OBEX.

e.Transfer of contact details, calendar appointments, and reminders between devices via OBEX.

f. Replacement of traditional wired serial communications in test equipment, GPS receivers and medical equipment.

g. For remote controls where infrared was traditionally used.

h.Sending small advertisements from Bluetooth enabled advertising hoardings to other, discoverable, Bluetooth devices.

i. Wireless control of a games console, Nintendo’s Wii and Sony’s PlayStation
3 will both use Bluetooth technology for their wireless controllers.

j. Sending commands and software to the upcoming LEGO Mindstorms NXT instead of infra red.

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Why is the technology called bluetooh?

Ans: The heart of the Bluetooth brand identity is the name, which refers to the Danish king Harald “Bluetooth” Blaatand who unified Denmark and Norway. In the beginning of the Bluetooth wireless technology era, Bluetooth was aimed at unifying the telecom and computing industries.

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What is bluetooth?

Ans: Bluetooth is the name for a short-range radio frequency (RF) technology that operates at 2.4 GHz and is capable of transmitting voice and data. The effective range of Bluetooth devices is 32 feet (10 meters). Bluetooth transfers data at the rate of 1 Mbps, which is from three to eight times the average speed of parallel and serial ports, respectively.

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How secure a bluetooth device is?

Bluetooth uses the SAFER+ algorithm for authentication and key generation. The E0 stream cipher is used for encrypting packets. This makes eavesdropping on Bluetooth-enabled devices more difficult.

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How many devices can communicate concurrently?

A Bluetooth device playing the role of the “master” can communicate with up to 7 devices playing the role of the “slave”. This network of “group of up to 8 devices” (1 master + 7 slaves) is called a piconet. A piconet is an ad-hoc computer network of devices using Bluetooth technology protocols to allow one master device to interconnect with up to seven active slave devices (because a three-bit MAC address is used). Up to 255 further slave devices can be inactive, or parked, which the master device can bring into active status at any time.

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Bluetooth dongle :

A device that hangs outside of a computer, or phone to provide Bluetooth connection.

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Range of bluetooth from transmitter/receivers

Bluetooth is designed for very low power use, and the transmission range will only be 10m, about 30ft. High-powered Bluetooth devices will enable ranges up to 100m (300ft). Considering the design philosophy behind Bluetooth, even the 10m range is adequate for the purposes Bluetooth is intended for. Later versions of the Bluetooth spec may allow longer ranges.

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Generic description for Bluetooth:

Bluetooth is a low-cost, short-range (RF) links between mobile PCs, mobile phones and other portable devices. Bluetooth can transmit through solid, non-metal objects

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Blue tooth profiles:

A profile is a description of how to use a specification to implement a particular function. The International Standards Organization (ISO) first came up with the idea of profiles. In Bluetooth, there are several profiles available and they are arranged in a hierarchical fashion. For example, in order to use the headset profile, a device must also include the lower level profiles such as the serial port and general access profiles.

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History of Bluetooth:

Bluetooth was initiated by Ericsson, IBM, Intel, Nokia and Toshiba in early 1998. These companies later formed a special interest group known as the Bluetooth SIG. The Bluetooth 1.0 specifications were released on July 26, 1999, but the technology has only recently become inexpensive enough for widespread use.

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How secure is a Bluetooth network?

Bluetooth is extremely secure in that it employs several layers of data encryption and user authentication measures. Bluetooth devices use a combination of the Personal Identification Number (PIN) and a Bluetooth address to identify other Bluetooth devices. Data encryption (i.e., 128-bit) can be used to further enhance the degree of Bluetooth security. The transmission scheme (FHSS) provides another level of security in itself. Instead of transmitting over one frequency within the 2.4 GHz band, Bluetooth radios use a fast frequency-hopping spread spectrum (FHSS) technique, allowing only synchronized receivers to access the transmitted data

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It is a real brief note on Blue tooth devarajan. It gives every detail about the product and it surely is helpful to everyone who isn't familiar with this product.

Some of the uses of Bluetooth:
Depending on the Bluetooth profiles included on the device, Bluetooth technology has the capability to wirelessly synchronize and transfer data among devices. The Bluetooth audio capabilities can be used for headset and hands free applications. The exact functionality provided by a Bluetooth enabled device depends on the Bluetooth profiles included.

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How is Bluetooth used?

A: Bluetooth can be used to wirelessly synchronize and transfer data among devices. Bluetooth can be thought of as a cable replacement technology. Typical uses include automatically synchronizing contact and calendar information among desktop, notebook and palmtop computers without connecting cables. Bluetooth can also be used to access a network or the Internet with a notebook computer by connecting wirelessly to a cellular phone.

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What is the future direction of the Bluetooth standard?

A: At this time, we anticipate the Bluetooth SIG to evolve the Bluetooth technology to provide greater bandwidth and distances, thus increasing the potential platforms and applications used in the emerging personal area networking marketplace

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What is Frequency-Hopping Spread Spectrum (FHSS)?

A: Frequency-Hopping Spread-Spectrum (FHSS) is a spread spectrum modulation scheme that uses a narrowband carrier that changes frequency in a pattern known to both transmitter and receiver. Properly synchronized, they maintain a single logical channel. To an unintended receiver, FHSS appears as short-duration impulse noise. More simply, the data is broken down into packets and transmitted to the receiver of other devices over numerous "hop frequencies" (79 total) in a pseudo random pattern. Only transmitters and receivers that are synchronized on the same hop frequency pattern will have access to the transmitted data. The transmitter switches hop frequencies 1,600 times per second to assure a high degree of data security.

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Bluetooth wireless technology :

Bluetooth wireless technology is a short-range radio technology. Bluetooth wireless technology makes it possible to transmit signals over short distances between telephones, computers and other devices and thereby simplify communication and synchronization between devices. It is a global standard that:

*eliminates wires and cables between both stationary and mobile devices;
*facilitates both data and voice communication;
*offers the possibility of ad hoc networks and delivers the ultimate synchronicity between all your personal devices.

Bluetooth radio uses a fast acknowledgment and frequency-hopping scheme to make the link robust, even in noisy radio environments.

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Will other RF (Radio Frequency) devices interfere with Bluetooth Devices?

A: No. Bluetooth radios operate on the unlicensed 2.4 GHz (Industrial, Scientific and Medical) frequency band that is shared among other devices (microwave ovens, cordless phones, garage door openers, etc. ). Bluetooth radios switch frequencies at such a rapid pace (1,600 times per second) and the data packets are so small that interference from other RF sources is highly unlikely. Bluetooth is a robust communication system

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Will Bluetooth and Wireless LAN (WLAN) interfere with each other?

A: No, both Bluetooth and WLAN can co-exist. Since Bluetooth devices use Frequency Hopping and most WLANs use Direct Sequence Spreading techniques they each appear as background noise to the other and should not cause any perceivable performance issues.

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What is the data throughput speed of a Bluetooth connection?

A: Bluetooth transfers data at a rate of 721 Kbps, which is from three to eight times the average speed of parallel and serial ports, respectively. This bandwidth is capable of transmitting voice, data, video and still images.

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devarajan