An index to the Delay Measurement Configuration table which indicates the specific measurement session for the MEP. jnxSoamPmMepOperNextIndex needs to be inspected to find an available index for row-creation. Referential integrity is necessary, i.e., the index needs to be persistent upon a reboot or restart of a device. The index is never reused for other PM sessions on the same MEP while this session is active. The index value keeps increasing until it wraps to zero. This is to facilitate access control based on a fixed index for an EMS, since the index is not reused.