Kansainvälisen televiestintäliiton (International Telecommunications Union ITU) julkaisemia radiotietoliikennealan standardeja. Nykyiset ja korvatut standardit vapaasti luettavissa pdf-muodossa.
Standards on radiocommunication by International Telecommunication Union, ITU. The ITU-R Recommendations constitute a set of international technical standards developed by the Radiocommunication Sector (formerly CCIR) of the ITU. In-force and superseded recommendations can be freely accessed.