MGT_tag [ATSC Semantics]
The MGT_tag is a 8-bit unsigned integer field in an ATSC AEIT is an 8-bit field that ties this AEIT instance to the corresponding table_type in the MGT
and to an AETT instance with the same value. The MGT_tag value for an AEIT instance for a
given timeslot shall be one higher (modulo 256) than the instance for the preceding time
period..
Ties together an AEIT section and the associated AETT section(s)
Byte index 32 of AEIT
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