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Bluetooth capability in one form or another is already
in billions of electronic devices in everyday use.
a separate radio transmitter licence.
The ISM band is used by a range of
electronic devices operating with a
variety of protocols. Another of the
conditions of use is that services must
accept any harmful interference that
may be caused by other nearby ISM
applications.
Bluetooth makes use of frequency
hopping spread spectrum technology.
This was designed to minimise the
effects of harmful interference from
nearby devices, particularly those
operating in the same band. By and
large, it works very well.
A basic Bluetooth network (known
as a piconet) is a decentralised type
of wireless computer-to-computer
network commonly referred to as an ad
hoc network. It employs a master/slave
configuration, and the master is able
to communicate with up to seven slave
devices on the same piconet.
Bluetooth network devices are smart,
and by suitable negotiation, the role of
master can be passed from one device
to another in the same piconet. One
example of a piconet is the hands-free
operation of a mobile phone through
the entertainment device in a vehicle.
Piconets can connect to and
communicate with other piconets to
form what is known as a scatternet.
In all wireless devices, the range is
governed by several factors, including
output power of the transmitter,
distance between transmitter and
receiver, antenna type, obstructions
along the path, background
interference, and so forth.
The output power of a Bluetooth
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