How a Bluetooth Work – Bluetooth devices will normally operate at 2.4 GHZ in the license-free, globally available ISM radio band. The advantage to the present band includes worldwide availability and compatibility. an obstacle to this, however, is that the devices must share this band with other RF emitters. This includes automobile security systems, other wireless devices, and other noise sources, like microwaves.
To overcome this challenge, Bluetooth employs a fast frequency hopping scheme and thus uses shorter packets than other standards within the ISM band. This scheme helps to form Bluetooth communication more robust and safer.
Frequency hopping is essentially jumping from frequency to frequency within the ISM radio band. After a Bluetooth device sends or receives a packet, it and the device (or devices) it’s communicating with a hop to a different frequency before the subsequent packet is sent. This scheme offers three advantages:
- Allows Bluetooth devices to use the entirety of the available ISM band, while never transmitting from a hard and fast frequency for quite a short period of your time . This helps ensure that Bluetooth conforms to the ISM restrictions on the transmission quantity per frequency.
Ensures that any interference won’t last long. Any packet that does not arrive safely to its destination is often resent to subsequent frequency.
Provides a base level of security as it’s very hard for an eavesdropping device to predict which frequency the Bluetooth devices will use next.
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The connected devices, however, must agree upon the frequency they’re going to use next. The specification in Bluetooth ensures this in two ways. First, it defines a master and slave type relationship between Bluetooth devices. Next, it specifies an algorithm that uses device-specific information when calculating the frequency hop sequences. How a Bluetooth Work.
A Bluetooth device that operates in master mode can communicate with up to seven devices that are set in slave mode. to every one of the slaves, the master Bluetooth device will send its own unique address and the value of its own internal clock. The information sent is then wont to calculate the frequency hop sequences.
Because the master device and every of the slave devices uses an equivalent algorithm with an equivalent initial input, the connected devices will always arrive together at a subsequent frequency that needs to be agreed upon.
As a replacement for cable technology, it’s no wonder that Bluetooth devices are usually battery-powered, like wireless mice and battery-powered cell phones. To conserve the facility, most devices operate in low power. This helps to offer Bluetooth devices a variety of around 5 – 10 meters.
This range is way enough for wireless communication but close enough to avoid drawing an excessive amount of power from the facility source of the device. That’s some explanation about How a Bluetooth Work.