Protection ratio
Protection ratio ( English protection ratio (RF | RF) ) is defined in Article 1170 of the ITU Radio Regulations of the (Radio Regulations) International Telecommunication Union (ITU) is defined as " usually in decibels expressed minimum value of the ratio between useful signal and interfering signal at the receiver input (a receiving radio station) , which is determined under certain conditions so that a certain reception quality of the useful signal is achieved at the receiver input . "
Frequency management
However, this is also a term of frequency management that is defined in a binding manner in the ITU languages, was published in the Radio Regulations and is used specifically in connection with the shared use of frequencies .