Communications engineering. CSS is applied for the automation in buildings, RFIDs and wireless multimedia techniques as a method with strong interference safety which requires only a small amount of power emitting therefore only a weak electromagnetic field. It works in the 2.4 GHz band with a data rate of 2 MBit/s and a range of 900 m outdoors, in buildings the data rate is 1 MBit/s and the range 60 m.
As a simplified variation of MDMA (Multi Dimensional Multiple Access) it represents a combination of amplitude-, frequency- and phase modulation. With the amplitude modulation the transmission power can be regulated to meet the requirements (speech transmission = low energy, data energy = higher energy), the frequency modulation is applied to gain a frequency spread over the whole available bandwidth which results in strong interference safety, the phase modulation is used to transmit the actual information.