This OID records the worst jitter (maximum delay variation) experienced one-way during this sampling period in microseconds. You track this because high jitter values can destroy VoIP call quality and cause buffer underruns in streaming applications. For example, if maximum jitter is 100000 microseconds (0.1 seconds) while minimum was 1000, it means some packets arrived 99 milliseconds apart, which would degrade real-time applications.