Let us start our study of the Bluetooth system with a quick overview of what
it contains and what it is intended to do. The basic unit of a Bluetooth system is a
piconet, which consists of a master node and up to seven active slave nodes within a distance of 10 meters. Multiple piconets can exist in the same (large) room
and can even be connected via a bridge node that takes part in multiple piconets,
as in Fig. 4-34. An interconnected collection of piconets is called a scatternet.