The Recommendation considering that geostationary-satellite networks in the fixed-satellite service operate in the same frequency bands; that it is necessary to limit interference to other users of the frequency spectrum; that VSAT earth stations will in general be unattended.
ITU-R S.729 SPANISH-1992 history
1992ITU-R S.729 SPANISH-1992 Control and monitoring function of very small aperture terminals (VSATs)