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Handling of Unidirectional NOP-in PDUs at the Target
Similarly, for a NOP-in PDU with ITT = TTT = 0xffffffff and StatSN = x, the PDU is outstanding until the initiator responds with a control-type PDU on the same connection where ExpStatSN is at least x+1
An implementation note was also added which recommended that “To avoid complexity, a NOP-in PDU with TTT /= 0xffffffff can be used instead”
PPT Version