1) When a device is in connection state, it is synchronized with the piconet. The device can be in any of the 4 modes:
a. Active mode
b. Hold mode
c. Sniff mode
d. Park mode
2) In active mode, the Bluetooth device, transmits and receive packets. The packet can be data packets or control packets.
3) To differential a Slave device from packed device the Slave device is assigned a bit address till the Slave is a member of this piconet.
4) The hold, park and sniff mode are used for saving power. It is achieved by reducing the duty cycle. They are called low Power states.
5) If a slave desires to remain inactive for sometimes, it enters into the park mode. In this mode the slave device maintain's synchronization with the master, but does not take part in the data traffic.
6) The park mode has time greater than the hold and sniff mode.
7) The hold mode is used for maintaining intermediate power efficiency. It is obtained by inactivating a device for small intervals of time of a timer.
8) For increasing the safeguarding the battery life the sniff mode is useful. It avoids unnecessary transmission of poll pockets. If large amount of data is to be transmitted from the master to the slaves, sniff mode is preferable to be used as the devices have highest duty cycle and least power efficiency in comparison to the other modes.
9) A unique inquiry and page algorithm is used by Bluetooth for connection management.
10) All the devices are assumed to be in stand by(SB) mode during the beginning. Let 'M' be the master terminal that registers are standby terminals. At the inquiry time it becomes a slave terminal.(S)
11) All the slave packets are sent to the master terminals when a "Page" message is sent to the slave terminal.
12) In the hold mode the data transfer restarts. In the sniff mode the slave device listens to the piconet and in the park mode the device will be inactive.
13) Thus, the connection established in Bluetooth is effective.