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v6.3
Bluetooth Pro
Figure: Start topology
Bluetooth uses 79 channels with a bandwidth of 1MHz per channel. In addition, Adaptive Frequency Hopping (AFH) is used to
enhance the transmissions.
Figure: Frequency channels in the 2.4GHz band
Bluetooth modules have some important parameters for their configuration:
•
MAC address:
It is the unique identification number of the Bluetooth device. It has 12 hexadecimal digits separated by
“:”. One example could be “12:34:56:aa:bb”.
•
Public Name:
It is the name that appears when a scan is performed in order to find new devices.
•
Class of Device (CoD):
Bluetooth devices are classified according to the device which they are integrated. Therefore a ve-
hicle hands free device will belong to a different class than a pedestrian mobile phone. This parameter has 6 hexadecimal
digit and it allows distinguish if the detected Bluetooth device is a vehicle, a pedestrian, and so on.
•
RSSI (Received Signal Strength Indicator):
This parameters shows quality of the radio link. It can be used to know the
distance between the Bluetooth module and the inquired device. It is shown as a negative value between -40 dBm (close
devices) and -90 dBm (far devices).
