This read-only Counter, with no default value, tracks the number of errored ICP cells received on the IMA group. An administrator watches this relative to rcvAcpCells, since a rising error rate here points to line-quality problems affecting the IMA control channel specifically, which can eventually push a link toward the HUNT state per the alpha/beta thresholds. For example, a steadily climbing rcvAcpErrCells count on an otherwise stable IMA group would prompt the operator to check the physical line quality of the member links.