Used to configure the OTN configuration of the line port. If set to unmapped, there is no OTN digital wrapper added to the STM-64 or STM-16 facility. The odu1ToOtu2 and otu2 mapping is applicable to STM-64 line ports as follows: odu1ToOtu2 - the line port is configured as an OTN digitally wrapped OTU2 facility containing 4 ODU1 units. otu2 - the line port is configured as an OTN digitally wrapped OTU2 facility to which an STM-64 facility is directly mapped. The subOdu1ToOtu1 and otu1 mapping is applicable to STM-16 line ports as follows: subOdu1ToOtu1 - the line port is configured as an OTN digitally wrapped ODU1 facility containing 4 sub-ODU1 units. otu1 - the line port is configured as an OTN digitally wrapped OTU1 facility to which an STM-16 facility is directly mapped. This object applies only to the STM-64 line port of the 10G MXP circuit pack and the STM-16 line port of the 8-port 2.5G circuit pack.