The presentation will now take a look at an example of an application where there is a set of sensor nodes that are required to take measurements and transmit the data to the control panel when asked. In many networks the control panel will send out a beacon frame to notify the node to send whatever data it may have collected. Each sensor node has its own time frame in which it looks for the beacon packet and transmits the data. This type of system requires the sensor to wake-up and listen for the beacon packet. It then has to respond and send the stored data to the control panel.