In wireless communications, instead of moving data over physical wires, it is transmitted across the air as RF energy. There are a large number of factors that can influence what happens in this channel. Here are some simple examples:
■ Attenuation due to range
■ Attenuation due to passing through objects such as product enclosures or walls
■ Multi-path effects from reflections off walls, floors, or other objects
■ Interference from other signals
All of these things impact the successful transmission of the signal from its source to its destination, and have it properly received.