| The networking standards of Bluetooth will | | | | with each other, although it's very unlikely. |
| transmit data via low power radio frequency. | | | | Bluetooth utilizes a technique known as low |
| Bluetooth communicates on a 2.45 GHz | | | | frequency hopping, which makes it harder for |
| frequency. This very band of frequency has | | | | more than one device to transmit on the same |
| been set aside by international agreement for | | | | frequency at the same time. |
| the use of industrial and medical devices. | | | | |
| | | | With this technique, a device will use 79 |
| Many devices that you already known and use | | | | individual, randomly chosen frequencies |
| take advantage of this frequency band. Garage | | | | within a designated range, which change from |
| door openers, baby monitors, and the next | | | | one another on a regular basis. |
| generation of mobile phones all use this | | | | |
| frequency within the ISM band. Ensuring that | | | | In the case of Bluetooth, the transmitters |
| Bluetooth and the other devices don't | | | | will change frequency 1,600 times or more |
| interfere with each other is a crucial part | | | | every second, meaning that more devices can |
| of the design process. | | | | make full use of the radio spectrum. Since |
| | | | every transmitter of Bluetooth will use |
| One of the ways Bluetooth will avoid | | | | spread spectrum automatically, it's very |
| interfering with other electronic devices is | | | | unlikely that two transmitters will be on the |
| by sending out weak signals of around 1 mw. | | | | same frequency at the exact same time. |
| In comparison, even the most powerful of cell | | | | |
| phones can transmit a signal of 3 watts. | | | | When the Bluetooth devices come within close |
| | | | range of each other, an electronic |
| The low power signals will limit the range of | | | | conversation will occur to determine whether |
| a Bluetooth device to around 32 feet, which | | | | or not they have data to share or whether one |
| cut the chances of interference between your | | | | needs to take total control. The user doesn't |
| computer and other electronic devices. Even | | | | have any buttons to press or commands to give |
| though it has low power, Bluetooth doesn't | | | | - as the conversation will occur |
| require a line of sight between the | | | | automatically. |
| communicating devices. The walls in your home | | | | |
| won't stop the signal, making it great for | | | | Once the conversation has occured, the |
| rooms throughout the house. | | | | devices will form a network. Bluetooth |
| | | | devices will create a PAN (Personal Area |
| Bluetooth can connect 8 devices at the same | | | | Network) or piconet that may fill a room. |
| time. With each of those devices on the same | | | | Once the piconet has been established, the |
| radius, you may think they would interfere | | | | devices will randomly hop in frequencies. |