System Time Table (STT) and Rating Region Table (RRT) are ATSC Tables defining the system Time/Date and the TV parental guideline (rating information) system referenced by any content advisory descriptor carried within the Transport Stream.
| ID | Name | Event Error | Description |
146 | STT Table Error | STT Error | ATSC, STT error. |
147 | STT Accuracy Error | STT Accuracy | ATSC, STT accuracy error (compared to NTP). |
148 | STT Table Missing | STT Missing | STT is not found. The message will specify whether the table is missing (never detected) or has been actively removed. |
149 | STT Table Repetition Rate Too Slow | STT Rep Slow | The repetition rate of the STT is too slow; configurable threshold. |
154 | RRT Table Missing | RRT Missing | RRT is not found. The message will specify whether the table is missing (never detected) or has been actively removed. |
155 | RRT Table Repetition Rate Too Slow | RRT Rep Slow | The repetition rate of the RRT is too slow; configurable threshold. |
159 | RRT Is Illegal | RRT Illegal | Illegal values or length on RRT table. |
160 | STT Is Illegal | STT Illegal | Illegal values or length on STT table. |
170 | RRT CRC change (Monitor changes to RRT CRC) | RRT CRC changed | Table CRC changed without version change. |
171 | RRT Version Change | RRT Version Changed | The RRT version was changed. |