This read-write value sets, in milliseconds, the interval between UDLD packets sent on the device, functioning as a finer-grained alternative to hpicfUdldConfigTimeInterval. Admins use it when they need sub-second timing control, though the MIB notes that some devices won't allow values under 1 second, may cap how many ports can run UDLD at fast intervals, or may round values up to their clock granularity. For example, the default of 5000 milliseconds matches the five-second default used by the decisecond-based interval object.