In the license-free, globally available ISM radio band is where Bluetooth devices will normally operate at 2.4 GHZ. Considered as an advantage to this band would be worldwide availability and compatibility. But the devices must share this band with other RF emitters and that would be a disadvantage. This includes automobile security systems, other wireless devices, and other noise sources, such as microwaves.
To overcome this challenge, Bluetooth employs a fast frequency hopping scheme and therefore uses shorter packets than other standards within the ISM band. This scheme helps to make Bluetooth communication more robust and more secure.
Learn about frequency hopping
Basically, frequency hopping is all about jumping form one frequency to the other within the ISM radio band. The device or devices that it is communicating with can hop to another frequency before the next packet is sent after a Bluetooth device sends or receives a packet.
This offers three advantages:
Allows Bluetooth devices to use the entirety of the available ISM band, while never transmitting from a fixed frequency for more than a short period of time. Bluetooth conforms to the ISM restrictions on the transmission quantity per frequency because of this very reason.
Ensures that any interference won't last long. You can resent any packet that doesn't arrive safely to its destination to the next frequency.
Since it is very hard for an eavesdropping device to predict which frequency the Bluetooth devices will use next, a base level security is also provided.
But the frequency that they will use next is what the connected devices must agree upon. There are two ways in which the specification in Bluetooth can ensure this. Defining a master and slave type relationship between Bluetooth devices is the first thing that it does. Next, an algorithm that uses device specific information when calculating the frequency of hop sequences will be specified.
If a Bluetooth device operates in master mode, it will be able to communicate with up to seven devices that are in slave mode. To each of the slaves, the master Bluetooth device will send its own unique address and the value of its own internal clock. You can then use the information sent in order to calculate the frequency hop sequences.
The connected devices will always arrive together at the next frequency that they have agreed upon because each of the slave devices and the master device use the same algorithm with the same initial input.
A range of around 5-10 meters is what Bluetooth devices usually have. This range is far enough for wireless communication but close enough to avoid drawing too much power from the power source of the device.
Enabling devices to communicate with each other is what Bluetooth does and this includes hands-free car kits as well as laptops.
To overcome this challenge, Bluetooth employs a fast frequency hopping scheme and therefore uses shorter packets than other standards within the ISM band. This scheme helps to make Bluetooth communication more robust and more secure.
Learn about frequency hopping
Basically, frequency hopping is all about jumping form one frequency to the other within the ISM radio band. The device or devices that it is communicating with can hop to another frequency before the next packet is sent after a Bluetooth device sends or receives a packet.
This offers three advantages:
Allows Bluetooth devices to use the entirety of the available ISM band, while never transmitting from a fixed frequency for more than a short period of time. Bluetooth conforms to the ISM restrictions on the transmission quantity per frequency because of this very reason.
Ensures that any interference won't last long. You can resent any packet that doesn't arrive safely to its destination to the next frequency.
Since it is very hard for an eavesdropping device to predict which frequency the Bluetooth devices will use next, a base level security is also provided.
But the frequency that they will use next is what the connected devices must agree upon. There are two ways in which the specification in Bluetooth can ensure this. Defining a master and slave type relationship between Bluetooth devices is the first thing that it does. Next, an algorithm that uses device specific information when calculating the frequency of hop sequences will be specified.
If a Bluetooth device operates in master mode, it will be able to communicate with up to seven devices that are in slave mode. To each of the slaves, the master Bluetooth device will send its own unique address and the value of its own internal clock. You can then use the information sent in order to calculate the frequency hop sequences.
The connected devices will always arrive together at the next frequency that they have agreed upon because each of the slave devices and the master device use the same algorithm with the same initial input.
A range of around 5-10 meters is what Bluetooth devices usually have. This range is far enough for wireless communication but close enough to avoid drawing too much power from the power source of the device.
Enabling devices to communicate with each other is what Bluetooth does and this includes hands-free car kits as well as laptops.
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