This read-only OCTET STRING holds a four-byte Station State of the upstream neighbor found via fddismtUpstreamReq, as defined by the SMT frame protocol, or all zeroes if that neighbor hasn't yet been learned. An administrator reads it to confirm the operational status of the specific upstream station discovered on this board's ring. For example, the admin reads fddismtUpstreamState for a newly cabled FDDI board and confirms it now reports a valid non-zero state, showing the ring has stabilized.