This read-write object specifies the framing type -- Superframe (sf) or Extended Superframe (esf) -- for the target slot line of an SRME mapping, applicable only when the target is a T1 Service Module using byte-synchronous mapping on the SRME (it doesn't apply to E1 modules); the default is esf when SRME lines use byte-synchronous mapping, otherwise notApplicable. An admin mapping a T1 tributary that must match a specific far-end framing convention would explicitly set this to sf or esf as required, rather than relying on the default. Since this is the one field that can be changed without deleting and recreating the mapping (per srmeRowStatus), an admin adjusting only the framing convention on an existing T1 mapping would update just this object.