STT, RRT

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.