This object specifies the fixed start date/time for the
SOAM Delay Measurement session. This object is used only used if
mefSoamDmStartTimeType is 'fixed' and is ignored otherwise.
The default value is year 0000, month 01, day 01, time 00:00:00.00.
This object can only be written at row creation time and cannot be
modified once it has been created.