Wireless Armenia

Bluetooth-network transmits data via in low power of radio waves. He communicates at a frequency of 2.45 gigahertz (actually between 2.402 GHz and 2.480 GHz, to be exact). This frequency band was set aside by international agreement for the use of industrial, scientific and medical destination (ISM).
The number of devices which you can use already is using the same radio frequency. Baby monitors, garage-door openers, and a new generation of wireless phones all use frequencies in the ISM. Make sure that Bluetooth and these other devices do not interfere with each other, was an essential part of the design process.
One of the ways, Bluetooth devices do not interfere with other systems, sending a very weak signal of about 1 m W. For comparison, the most powerful mobile phones can transmit a signal to 3 Watts. Low-power Bluetooth device within the range of about 10 meters (32 feet), cutting the chances of interference between your computer and a portable telephone or television. Even at low power, Bluetooth does not require line of sight between the communicating devices. The walls in your house will not stop Bluetooth signal, making the standard useful for controlling several devices in different rooms.
Simultaneously Bluetooth can connect up to eight devices. With all of these devices in the same 10-meters (32 feet) radius, you would think they interfere with each other, but this is unlikely. Bluetooth uses a technique called spread-spectrum frequency hopping, which makes it rare for more than one device to transmit on one frequency at the same time. In this technique, the device will use 79 individual, randomly chosen frequencies within a specified range, going from one to another on a regular basis. In the case of Bluetooth, the transmitters change frequencies 1,600 times per second, meaning that more devices can make full use of the limited slice of spectrum. Since each transmitter uses Bluetooth spread spectrum transmission automatically, it is unlikely that two transmitters will be on the same frequency at the same time. The same method makes less the risk that portable phones or baby monitors will disrupt Bluetooth devices, since any intervention at a particular frequency will last only a fraction of a second.