701 B
701 B
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Bluetooth frequency hopping
Bluetooth transmits on the 2.5GHz frequency band. As this is an unlicenced band there can be interference to the signal and interception.
To get around this, bluetooth engages in frequency hopping. It rapidly switches its channel of transmission between 79 distinct frequences within the 2.5GHz band where each channel occupies a bandwidth of 1MHz.
Each available band is divided into time slots. This allows multiple devices to communicate simultaneously without interfering with each other (that much). The master device controls the sequencing and synchronisation of the time slots.