This object specifies the type of test pattern to be
sent in the DM frame Test TLV when the size
of DM PDU is determined by the jnxSoamDmFrameSize object and
jnxSoamDmTestTlvIncluded is 'true'. If the frame size object
does not define the DM frame size or jnxSoamDmTestTlvIncluded
is 'false' the value of this object is ignored.
This object can only be written at row creation time and cannot be
modified once it has been created.