For 10 GE interfaces, both 10 GE LAN PHY and OTU2 encapsulated 10GE LAN PHY will be supported. The line mapping attribute allow provisioning of either of the protocol. This attributes applies to 10 GE interfaces only. When a 10 GE interface is configured as a stacking port, this field is set to stacking. NOTE: This parameter does not apply to gigabitEthernet type interfaces, attempts to set this for gigE port types will fail. Reading this object for non-10GigE interfaces will return notApplicable.