Standard for short range radio communication

Akronim: Bluetooth

Bluetooth
An industrial standard for low power, short range, radio communication
between devices. Bluetooth is used to allow mobile phones, computers,
PDAs and the like to communicate across short distances, i.e. providing
a personal area network (PAN).
Bluetooth operates in the 2.4 GHz band (2.4GHz to 2.4835GHz in US and
Europe or 2.472GHz to 2.497GHz in Japan). Cordless phones and Wi-Fi
devices also operate in this band, so there is potential for
interference. Bluetooth uses Adaptive Frequency Hopping (AFH) to reduce
interference by hopping through the available frequencies to minimize
the effects of interference.
The Bluetooth specification allows for thee classes of device, each
with difference power requirements and maximum ranges. These classes
are:


Class
Power
Approximate Range


Class 1
100mW
20 dBm
100 meters


Class 2
2.5mW
4dBm
10 meters


Class 3
1 mW
0dBm
1 meter


Bluetooth allows data to be transmitted at up to 1mbps,
or up to 3mbps with EDR (Enhanced Data Rate - available from November
2004). Each Bluetooth device is uniquely identified by a unique 48-bit
identifier (similar in concept to a MAC
address, but not to be confused as the same).
Relevant links:

www.bluetooth.com - The
official Bluetooth Wireless information site.
www.tech-faq.com/bluetooth.shtml
- Details on Bluetooth including a good overview of the security
and weaknesses inherent in bluetooth.
www.wi-fiplanet.com/tutorials/article.php/1379911
- reasons for Bluetooth interference with WiFi and steps to
minimize such interference.

www.geekzone.co.nz/content.asp?contentid=108 - What is
Bluetooth?

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