This object is an octet string in which the number of octets
is equal to etsysCosTxqPortEnhancedTransMaxGroups. The value
of the first octet represents the DCB Enhanced Transmission
Selection Traffic Class number for the first group. The second
octet represents the DCB Enhanced Transmission Selection
Traffic Class number for the second group and so forth.
DCB Enhanced Transmission Selection Traffic Classes correspond
to a value of 0 to 7 which is defined by 802.1D. A value of
255 means the group is not part of Enhanced Transmission.