Besides wireless applications based on WLAN and Bluetooth technologies communication via infrared radiation is on off er for some time. Infrared is light with wavelengths between 7.8×10−7 and 10−3 m corresponding to a frequency range of 3×1011 Hz up to 4×1014 Hz. One advantage of infrared radiation is its marginal harmfulness and susceptibility against electrical interference. One disadvantage is its small reach. Other advantages include:
simple and low cost implementation• low electrical power requirements• directed point-to-point connection• effi cient and reliable data transmission.•
For infrared communication standards have been developed which are oriented to possible applications. In the following these standards will be presented with regard to their architecture including transmission protocols. Th ereaft er possible applications will be considered and potential risks discussed. A small checklist at the end of this section lists key points to be observed when choosing and implementing infrared communication.