Sensor Stack & Channel
Sensor stack is a signal sink that is responsible for triggering the application layer every time a sensing event occurs
Simple sensing scheme to elaborate signal processing can be implemented on sensor stack
Sensor stack acts as a signal source in Target Node and contains signatures unique to the model
Sensor channel model the medium of signal transmission (e.g. ground to carry seismic events).
A good simulation tool should model varieties of mediums and type of sensors ( acoustic, infra red, ultrasonic)