In contrast to common-frequency networks, multi-frequency networks (MFN) operate with different transmission frequencies. The technology of multi-frequency networks is known from terrestrialbroadcasting, in which all neighbouring transmitters transmit on different carrier frequencies
. Each transmitter of a multi-frequency network irradiates its own transmission area, which represents a separate radio cell. One of the main advantages of multi-frequency networks is that there is no interference
between adjacent channels. The frequencies used in multi-frequency networks can only be used again by another transmitter at a certain distance. The distance must be large enough so that the different transmission frequencies do not interfere with each other.