File transfer
How are files transferred through blue tooth device?
S. M. AFINS
Marthadam, Tamil Nadu
The Bluetooth system is built around an RF transceiver, a base band and a protocol implementer. Under this protocol, transmission of data takes place through low power radio waves on a frequency band between 2.4 GHz and 2.48 GHz.
There are three power levels, 100mW-2.5mW-1mW, for three classes of blue tooth devices called Class 1, Class 2 and Class 3 respectively meant for data transmission over up to 100metres, 10 metres or 1metre. The Bluetooth computer keyboards and pointing devices like mice setup a class 3 net work.
Transferring data from digital cameras and picture phones fall into the Class 2 devices and the modems work in the extended Class 1 network. When Bluetooth- devices come within the range of one another, an electronic conversation takes place in order to determine whether they have data to share or whether one needs to control the other.
This sets up a PAN where the member devices randomly hop frequencies and stay in touch with one another while avoiding other PANs even if they are operating in the physical vicinity.
Dr. H. K. SAHU
Scientific Officer, IGCAR
Kalpakkam, Tamil Nadu
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