The number of inbound frames transmitted by the LAN adapter to the Blocker Task which were discarded by the 3172, even though no errors had been detected to prevent their being deliverable to a higher layer protocol. One possible reason for discarding such a frame could be because of insufficient buffer space. This variable, when combined with ibm3172ifInLANDiscards, reflects the total number of inbound frames discarded by the 3172 when no error was detected.