Tables are identified by the table_id field. However, in cases such as the RRT and EIT, several instances of a table may be defined simultaneously. All instances have the same PID and table_id but different table_id_extension.
Source: 65, 69
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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.