Tektronix MTM400 - Manual (Page 107)

Stream View
MTM400 MPEG Transport Stream Monitor User Manual 3-59
A brief explanation of each graph type follows:
Section Repetition Interval
On a specific PID, this is the interval between the arrival of a section with a
specific table_id and the next section with the same table_id.
Subtable Inter Section Gap
This is the interval between the end of one section and the start of the next section
in the same subtable. A PID, table_id and table_id extension usually define a
subtable, but this varies with table type. (Not available for ATSC.)
Subtable Repetition Interval
This is the repetition rate for complete subtables.