This value, together with tmnxDot1agCfmMepSlmTWInterval, specifies whether the interval between two-way SLM messages is expressed in seconds(1) or centiseconds(2), supporting the sub-second and multi-second intervals documented under the interval object. An admin selects centiseconds(2) when a sub-second SLM interval is needed for finer-grained loss detection over a short test. Getting the units wrong relative to the intended interval value produces a test cadence off by orders of magnitude from what was intended.