Interface "Bluetooth" today has becomequite widespread in different types of devices, in particular personal computers, mobile phones, tablets and others. Of course, users are not insured against various problems. Most often it is easy to understand the causes of problems, it is enough to be familiar with the basic principles of the operation of the specified interface. "Bluetooth" - what is it? How to use it?
Technology features
"Bluetooth" is a wirelessan interface characterized by a small radius of action, which was created in 1994 by engineers at Ericsson, located in Sweden. In 1998, a number of companies created a special organization Bluetooth Special Interest Group (Bluetooth SIG), which is still working in the development, promotion and implementation of this technology. At the moment, the number of companies that have become members of the association has exceeded 13 thousand.
The main advantage of this technology isThe fact that the Bluetooth connection does not require large resources in terms of energy consumption, and the cost of transceivers is relatively low compared to other wireless transmission technologies. All this allows the use of such a technical solution, even in small-sized devices with miniature batteries. For the use of the described interface, equipment manufacturers are not required to pay anything to the creators of the technology. This fact played a significant role in the wide distribution of this interface in a variety of devices.
What is it for?
In short, we looked at what "Bluetooth" is.That this useful thing is already clear. And with how to use it, you should still understand. The main purpose of this technology is to create personal networks that provide opportunities for data exchange between gadgets in the vicinity. These can be laptops, desktops, mobile and peripheral devices, and more, belonging to this category.
Application
Для различных целей можно использовать "Блютуз".We have already learned that this is a device that allows you to combine several devices into a network. But how is the connection? In the case of two gadgets, the connection is carried out according to the “point-to-point” scheme, and in the case of a large number of devices, this will already be the “point-to-multipoint” scheme. Regardless of the scheme used, the master and slaves are allocated.
The master device sets the pattern usedall slaves, as well as assigned to him the task of synchronizing all devices. Through such a compound, a piconet is formed. Within one such decision, it is allowed to merge one master and seven slave devices. In addition, it is possible to add several more devices to the piconet, which will be slaves, but only in the status of temporarily blocked. They do not participate in the information exchange, however, they synchronize with the master using the Bluetooth interface. What it is, it becomes clear, if we imagine how data from the one source comes to everyone else in real time. This is convenient and opens up a lot of opportunities for organizing work.
Maximum number of devices
Another level of pairing is association.several piconets in a single distribution network. For this, a device that is slave in one piconet assumes the task of leading to another. In this case, the peculiarity is that piconet belonging to the same distribution network use different patterns and are not synchronized with each other. The structure of one distribution network can not include more than 10 piconets. It turns out that by organizing a distribution network, including Bluetooth devices, it is possible to unite up to 71 devices in total.
Features of data transmission
For data transmission, a radio channel is used inthe frequency range 2.4-2.4835 GHz, supplemented by the method of pseudo-random tuning of the operating frequency. The indicated range is divided into 79 channels, for each of which a 1 MHz wide band is allocated. The upper and lower part of the range contains unused bands that are considered protective. Data transmission is carried out using Gaussian phase modulation, which implies a change in the carrier frequency with time, respectively, with a Gaussian curve, and this significantly limits the spectrum of the emitted signal.
Bluetooth adapter performs data exchange insidetime intervals whose length is 625 μs. The transfer of each slot ends with the transition to a new frequency channel. The link layer assumes that data is exchanging packets, each of which has a length of one to five slots. A certain part of them can be reserved for synchronous channels intended for broadcasting streaming data. It turns out that the transfer can be carried out not only synchronous data, but asynchronous.
The specification of the device "Bluetooth" is providedthe ability to use two types of communication: synchronous with the establishment of the connection, and asynchronous, in which the connection is not established. The application of the first option is relevant when creating point-to-point channels between the master and slave devices. The purpose of the second one is to organize a point-to-multipoint pairing between the piconet master and all slaves.
Bluetooth device classes
Depending on how powerful andthe effectiveness of the range is characterized by "Bluetooth" adapter, there are three classes of transceivers. The most common option that is relevant for use in most computers and mobile devices manufactured by modern industry are second-class transceivers. Medical equipment is equipped with low-power transmitters of class 3, and the most long-range modules belonging to class 1 are used in control systems and monitoring of industrial equipment.
Customization Features
If you want to install Bluetooth on your computer,and then use it to pair with any devices, you should be guided in the features of its settings. Using this technology, you can use short-range radio waves to connect to wireless networks, as well as access peripheral devices that are compatible with the technology version: printer, mouse, mobile phone, as well as other computers and communicators.
Since this is a wireless connection,is carried out by radio waves, then any peripheral device is allowed to move in space, and the connection will not be lost if it does not leave the “visibility” zone. If you want to connect the "Bluetooth" to the computer, you should know that this is done automatically when the device falls within the transmitter's coverage area. It is enough to make all the necessary settings once. In most notebook models, the transmitters are built in initially, you only need to configure them correctly, so that everything will work without interruption.
Setting up the device "Bluetooth" for "Windows"
For the implementation of this operation is requiredperform very specific actions. First you need to make sure that this adapter is in the laptop. After that you need to download all the necessary drivers. After activating the driver installer and launching the Add Device Wizard, everything will be determined automatically.
When the device is detected, it is necessarywill add. If the system was unable to find it, then you should make sure that the device is fully charged and that it receives power, that it is turned on and located in the coverage area. Information about the range of any device can be found in the accompanying documentation. After the detailed component check is completed, you need to restart the Add Device Wizard.
Problems that may arise
If you are confused about how to turn on Bluetooth, thenYou may note that in the absence of the component itself on the laptop's taskbar, the corresponding icon may be present. It is required to hide it. To do this, click on the icon, and then on the item "Customize".
Когда устройства "Блютуз" включены, на дисплее displays a list of all paired devices that are available in the working range. In this case, each, as already mentioned earlier, has its own range, which is required to be considered when pairing.
Features of work
All the latest phones, tablets andlaptops receive as a mandatory component of the module "Bluetooth", the presence of which is confirmed by the logo-icon on the screen or the device. When the connection is established, the corresponding logo will appear on the screen, and the data exchange is accompanied by an additional display. Now manufacturers are embedding the device "Bluetooth" on the tablet, phone and computer.
In addition to mobile devices, this technologyapplicable for desktop computers, to provide communication between mice, keyboards, digital cameras, scanners, printers, headphones and a variety of headsets. This equipment supports data exchange at a distance of up to 100 meters. Sometimes support for wireless communication is possible even when using devices located in different rooms.
Pairing different devices
If you use "Bluetooth" for phone or otherdevices when connected to a PC, it is necessary to install a port-connector on the computer, in form resembling a regular USB flash drive. Drivers and the necessary programs are usually supplied with the equipment, but if they are not there, you can always use the help of the official website to get the necessary applications.
If we consider the device "Bluetooth" forthe phone, the most interesting invention became wireless headphones using this technology. With their help, you can talk on the phone even when your hands are busy: when playing sports, driving a car, etc. If you know how to turn on Bluetooth to activate the headset, you can always free your hands while you are talking. by phone. The device itself may at this time be in a bag or pocket.
