by R. K. Bloom

Wireless Bluetooth technology

Wireless Bluetooth technology


Bluetooth. This is a short word in recent years more and more read on the news feeds. All have heard that this technology is wireless network. However, these technologies have existed before, but none of them did not have and does not have such a powerful and comprehensive support, and neither one of them about so much was said. What is so special about Bluetooth?

Bluetooth word can be translated as “blue tooth”, or “blue jaw,” which, of course, does not describe the nature of any technology or anything else. Bluetooth – this was the nickname of the Danish king Haralda BlEtanda, which is very harsh Viking long united Denmark and Norway. This name was chosen as the name of technology because it was originally conceived as a means of Bluetooth for easy connection of computers and telecommunications devices such as mobile phones.

As seen in todays card, the kingdom was first Bluetooth is not eternal, but today it is Bluetooth developers do not seem scary. And, as the current situation, they have every reason to it. The developed technology was so successful that it seems that a few years it will be everywhere, from computers and mobile phones (as originally anticipated), to refrigerators and microwave ovens (which were not originally intended). In general, giving the Internet in the kitchen!

It all began with the fact that at the beginning of 1998 the company Nokia, Ericsson, IBM, Intel and Toshiba have formed a consortium, which is engaged in the development of wireless technology, which is called Bluetooth. Initially, the consortium was open to cooperation, and now the Bluetooth SIG (Special Interest Group) Promoters, which develops standards include 3Com, Ericsson, IBM, Intel, Lucent, Microsoft, Motorola, Nokia, and Toshiba. Currently a version 1.0.B specification, released December 1, 1999. At the time of release of the specification was announced that she is not final and the final specification to be released three years later. A

These three years have to go to the “run-in combat.” In addition to these companies, a group of Bluetooth can be absolutely free to enter any company that plans to produce or develop devices and software specifications, based on Bluetooth. At present, this group has already logged about 2,000 companies in different fields, so that the prospects for Bluetooth is really good.

Physically, a typical Bluetooth device is a radio receiver and transmitter, operating at frequencies 2400-2483.5 MHz. These frequencies are chosen not by chance, they are open and free of any licensing in most countries. The exceptions are Spain and France. Until recently, the company has been present, and Japan, but in October 1999 where the problem is partially solved, and now the Bluetooth device and Japan may use the full range of radio frequencies provided by the specifications of Bluetooth. Although some restrictions in Japan still remain. In Spain, the radio spectrum allowed for the use of Bluetooth devices is limited to 2445-2475 MHz, in France, this spectrum is restricted to 2446.5-2483.5 MHz. Therefore, Bluetooth devices designed specifically for France, Spain or Japan will not work with devices designed for the rest of the world. Accordingly, the converse is also true. Currently, members of the Bluetooth consortium working with the authorities of these countries, and there is reason to believe that this situation will not last long.

Determine the frequencies used by Bluetooth capabilities for data transfer. The width of the channel for Bluetooth devices is 723.2 kb / s in asynchronous mode (though even in this mode still remains up to 57.6 kb / s for simultaneous transmission in the opposite direction), or 433.9 KB / s in the fully synchronous mode. If no data is transmitted, then via a Bluetooth connection can transmit up to three audio channels. Each of the audio channels supported by 64 kb / s synchronous audio channel in each direction. In addition, it is possible, and a combined transmission, voice and data.

The distance to the that can be installed Bluetooth connection is small, ranging from 10 to 30 meters. Currently, work is underway to increase this distance, at least up to 100 meters. But even now, the Bluetooth does not require line of sight, or any directional antenna, the connection can be established even through a wall (of course, if the wall is not screened).

The main feature of Bluetooth is that the various Bluetooth devices are connected to each other automatically, once they come within reach. The user does not have a headache about cables, drivers, or anything else, all that was required of him is make sure that Bluetooth devices would be located close enough to each other, everything else should take care of themselves Bluetooth devices and software.