According to Recommendation ITU-R SNG.770, SNG is defined as "Temporary and occasional transmission with short notice of television or sound for broadcasting purposes, using highly portable or transportable uplink earth stations…". The equipment should be capable of uplinking the video programme (or programmes) with its associated sound or sounds programme signals.
ITU-R SNG.770 Uniform operational procedures for digital satellite news gathering (DSNG)*, 2012-01-01 Update
ITU-T H.222 Frame Structure for 384-1920 kbit/s Channels in Audiovisual Teleservices - Transmission of Non-Telephone Signals - Transmission of Sound-Programme and Television Signals (Study Group XV) 2 pp
ITU-R SNG.1421 SPANISH-1999 history
1999ITU-R SNG.1421 SPANISH-1999 Common Operating Parameters to Ensure Interoperability for Transmission of Digital Television Satellite News Gathering