The value of tmnxOtuIfSmTtiTxMode specifies the type of Trail Trace
Identifier (TTI) for the Section Monitoring (SM) in the OTU overhead.
Specifying a tmnxOtuIfSmTtiTxMode value of 'auto (0)' along with
tmnxOtuIfSmTtiTx set with a single octet of '0xFF' will revert the
SM-TTI to the default:
'<system-name>/<iom-slot>/<mda-slot>/<port-number>/C<dwdm-channel>'