<s>
A	O
piconet	B-General_Concept
is	O
an	O
ad	B-Protocol
hoc	I-Protocol
network	I-Protocol
that	O
links	O
a	O
wireless	O
user	O
group	O
of	O
devices	O
using	O
Bluetooth	B-Protocol
technology	I-Protocol
protocols	O
.	O
</s>
<s>
A	O
piconet	B-General_Concept
consists	O
of	O
two	O
or	O
more	O
devices	O
occupying	O
the	O
same	O
physical	O
channel	O
(	O
synchronized	O
to	O
a	O
common	O
clock	O
and	O
hopping	O
sequence	O
)	O
.	O
</s>
<s>
Some	O
examples	O
of	O
piconets	B-General_Concept
include	O
a	O
cell	O
phone	O
connected	O
to	O
a	O
computer	O
,	O
a	O
laptop	O
and	O
a	O
Bluetooth-enabled	O
digital	B-Device
camera	I-Device
,	O
or	O
several	O
PDAs	B-Application
that	O
are	O
connected	O
to	O
each	O
other	O
.	O
</s>
<s>
A	O
group	O
of	O
devices	O
are	O
connected	O
via	O
Bluetooth	B-Protocol
technology	I-Protocol
in	O
an	O
ad	O
hoc	O
fashion	O
.	O
</s>
<s>
A	O
piconet	B-General_Concept
starts	O
with	O
two	O
connected	O
devices	O
,	O
and	O
may	O
grow	O
to	O
eight	O
connected	O
devices	O
.	O
</s>
<s>
Bluetooth	B-Protocol
communication	O
always	O
designates	O
one	O
of	O
the	O
Bluetooth	B-Protocol
devices	O
as	O
a	O
main	O
controlling	O
unit	O
or	O
master	O
unit	O
.	O
</s>
<s>
This	O
allows	O
the	O
Bluetooth	B-Protocol
system	O
to	O
be	O
non-contention	O
based	O
(	O
no	O
collisions	O
)	O
.	O
</s>
<s>
This	O
means	O
that	O
after	O
a	O
Bluetooth	B-Protocol
device	O
has	O
been	O
added	O
to	O
the	O
piconet	B-General_Concept
,	O
each	O
device	O
is	O
assigned	O
a	O
specific	O
time	O
period	O
to	O
transmit	O
and	O
they	O
do	O
not	O
collide	O
or	O
overlap	O
with	O
other	O
units	O
operating	O
within	O
the	O
same	O
piconet	B-General_Concept
.	O
</s>
<s>
Piconet	B-General_Concept
range	O
varies	O
according	O
to	O
the	O
class	O
of	O
the	O
Bluetooth	B-Protocol
device	O
.	O
</s>
<s>
Because	O
the	O
Bluetooth	B-Protocol
system	O
hops	O
over	O
79	O
channels	O
,	O
the	O
probability	O
of	O
interfering	O
with	O
another	O
Bluetooth	B-Protocol
system	O
is	O
less	O
than	O
1.5	O
%	O
.	O
</s>
<s>
This	O
allows	O
several	O
Bluetooth	B-General_Concept
piconets	I-General_Concept
to	O
operate	O
in	O
the	O
same	O
area	O
at	O
the	O
same	O
time	O
with	O
minimal	O
interference	O
.	O
</s>
