This object indicates the version of the PDUs used to perform
Delay Measurement.
Version 0 indicates the PDU formats defined in Y.1731-2008.
Version 1 indicates the PDU formats defined in Y.1731-2011.
The exact PDUs to use are specified by this object in combination with
jnxSoamDmCfgType.
This object can only be written at row creation time and cannot be
modified once it has been created.