This read-create ClockStratum object sets the stratum level associated with this clock source when configured for NCDP, used as a tiebreaker (lower value wins) when priority values are equal, with cwnAtmSourcePRSReference used as the next tiebreaker if stratum also ties. An admin configures this to reflect the actual quality tier of the clock source so that NCDP's tiebreaking logic makes sensible choices among equally-prioritized sources. Two sources tied on priority but differing in stratum would have the lower-stratum (higher-quality) source win the tiebreak automatically.