ITU-R F.390-4-1982 Definitions of Terms and References Concerning Hypothetical Reference Circuits and Hypothetical Reference Digital Paths for Radio-Relay Systems - Section 9A - Performance Objectives, Propagation and Interference Effects
that the following definitions be used for defining the nature and properties of hypothetical reference
circuits and hypothetical reference digital paths
ITU-R F.390-4-1982 history
1982ITU-R F.390-4-1982 Definitions of Terms and References Concerning Hypothetical Reference Circuits and Hypothetical Reference Digital Paths for Radio-Relay Systems - Section 9A - Performance Objectives, Propagation and Interference Effects