This read-create integer, from 10 to 65535 seconds and defaulting to 1800, sets how often the sampled variable's value is compared against the rising and falling thresholds; it cannot be modified once the entry's status is valid. Admins tune it short enough that a fast-changing deltaValue-sampled counter won't wrap or overflow between samples, while balancing against polling overhead. For example, an admin monitoring a rapidly incrementing error counter with deltaValue sampling would shorten h3cRmonExtAlarmInterval to avoid missing a threshold crossing between long sample gaps.