Bluetooth is a wireless technology standard for short-distance data exchange (using short wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz) of fixed and mobile devices and the creation of personal area networks. Invented by telecommunications provider Ericsson in 1994, it was originally conceived as a wireless alternative to RS-232 data cables. It can connect up to seven devices, overcoming the problems older technologies had when trying to connect to each other.
A Bluetooth device uses radio waves instead of cables or cables to connect to a phone or computer. A Bluetooth product, such as a headset or watch, contains a tiny computer chip with a Bluetooth radio and software that makes it easy to connect. When two Bluetooth devices want to talk to each other, they need to be paired. Communication between Bluetooth devices occurs through short-range ad hoc networks known as piconets. A piconet is a network of devices connected by Bluetooth technology. When a network is established, one device takes on the role of master while all other devices act as slaves. Piconets are dynamically and automatically set as Bluetooth devices enter and leave the vicinity of the radio. Bluetooth Networking
As mentioned earlier, Bluetooth works on radio frequency signals. An international agreement has been established for the use of industrial, scientific and medical devices (ISM), to set aside a frequency band between 2.402 GHz and 2.480 GHz for Bluetooth. But the same frequency has been used by many other types of equipment. Therefore, special ideas have been implemented to avoid interference between them.
To avoid interference, low power signals are propagated from the device (10mW). This is why the Bluetooth device's range is limited to a maximum of 10 meters. This will prevent interference between your PC and your mobile phone. Even if 8 devices are used within 10 meters, they will not interfere. The possibility of more than one device transmitting the same frequency at the same time will be neglected. The method is called "Spread Spectrum Frequency Hopping," whereby a device will use nearly 79 randomly selected individual frequencies that are intended for a particular range. The rate of change of these frequencies will change from one to another on a regular basis.
In bluetooth, the Hopping method of Scattered Spectrum Frequency has the frequencies changing almost 1600 times / second. This means that a large number of devices can use a portion of the frequency spectrum. Either device does not have the same frequency at any given time. Therefore, this method ensures that there will be no interference from Bluetooth devices with other devices. As time goes on, it restricts the interference to a fraction of a second.
Bluetooth is a specification of the telecommunication industry that describe how mobile devices, computers and other devices can easily communicate with each other through a short-range wireless connection. Bluetooth versions allow users of cell phones, pagers and personal digital assistants Buy a three-inch phone - a phone that could double as a portable phone at home or in the office, get quickly synchronized with information on a desktop or laptop computer, start sending or receiving a fax, start an impression.All the mobiles and the fixed devices of the computer are fully coordinated over a short distance. The latest Bluetooth versions allow the user to make hands-free calls through a mobile phone or connect wireless headsets to the music playlist of a smartphone, for example. Bluetooth technology can simplify tasks that previously involved copious cables between peripheral devices. For example, with a Bluetooth-enabled printer, you can wirelessly connect to a desktop, laptop, or mobile device and print documents. It is also possible to sync a wireless keyboard with a tablet style device, such as an Apple iPad or Kindle Fire, or even a DVD player with a TV.