This Recommendation provides the means to identify the allocation of multiple audio signals oninternational contribution circuits as well as the preferred ordering of these signals.
ITU-R BS.1738-1-2015 Referenced Document
ITU-R BR.779 Operating practices for digital television recording
ITU-R BS.1726 Signal level of digital audio accompanying television in international programme exchange
ITU-R BS.1738-1-2015 history
2015ITU-R BS.1738-1-2015 Identification and ordering of 4 and 8 track audio channels carried on international contribution circuits