See also: Latency

CIMM DEFINITION: The time offset between the actual occurrence of an event on a Set-Top Box (e.g., channel change, Remote Control key press, etc.,) and the reception of that event signal by the collection engine. For example, consider channel change Latency. Not only is this affected by Set-Top Box type, resident application type and version, and other factors, but the exact moment in that Latency period when the event is reported to the Collection Engine varies based on these same factors. One STB may have a three second channel change Latency, and the channel change event is signaled at the start of those three seconds. Another STB may have a two second channel change Latency, but the channel change is signaled at the end of the Latency period. Collection engines must measure and account for such discrepancies on a STB by STB basis (e.g., via Clock Sychronization). (Source: FourthWall Media)