If the event represents a threshold crossing event, the two
objects cdot3OamEventThresholdHi and cdot3OamEventThresholdLo
form an unsigned 64-bit integer yielding the value that was
crossed for the threshold crossing event (for example, 10,
when 11 occurrences happened in 5 seconds while the threshold
was 10). The two objects are combined as:
cdot3OamEventLogThreshold = ((2^32) * cdot3OamEventLogThresholdHi)
+ cdot3OamEventLogThresholdLo
Otherwise, this value is returned as all F's (2^32 -1) and
adds no useful information.