BLUETOOTH ARCHITECTURE

                             Bluetooth defines two types of network:

                                    a) Piconet

                                    b) Scatternet

•  Bluetooth is a packet-based protocol with a master-slave structure. One master may communicate with up to 7 slaves in a piconet, all devices share the master's clock.
• Whenever there is a connection between two Bluetooth devices, a piconet is formed . Any Bluetooth device can be either a master or a slave. All devices have the same timing and frequency hopping sequence.
• A Bluetooth  network is called a PICONET or a slave. All devices have the stations, one of which is called PRIMARY and the rest are called SECONDRIES .
• The communication between  the primary and the secondary can be one- to -one or one-to-many. 
  

• A piconet can have maximum of 7 secondaries must be active state an additional 8 secondary's can be in the parked state.
• A secondary in a parked state is synchronized with the primary but cannot take part in communication until it is moved from the parked state means that an active station must go to the parked state.
• Multiple piconets can exist in the large room and can even be connected via a bridge node.

• The master chooses which slave device to address , it switches rapidly from one device to another in a round-robin fashion. Since it is the master that chooses which slave to address , whereas a slave is supposed to listen in each receive slot.
• Being a master of seven slaves is possible; being a slave of more than one master is difficult.

SCATTER NET:-

• An interconnected collection of piconets is called a SCATTERNET .
• A secondary station in one piconet can be the primary in another piconet . This station can receive messages from the primary in the piconet and acting as a primary , delivery them to secondaries in the second piconet.
• A station can be a member of two piconets.