The value of the object tmnxMacMafMatchCfmOpCodeOper specifies which
type of opcode checking is to be performed.
If different fron none, more info is provided in the objects
tmnxMacMafMatchCfmOpCodeValue1 and tmnxMacMafMatchCfmOpCodeValue2.
This object has significance only if the object tmnxMacMafMatchFrameType
refers to either ieee802.1ag or Y1731.