This field records how much the counter for Signal Quality Error (SQE) heartbeat test failures, a legacy Ethernet transceiver self-test error inherited from 10BASE-T/AUI signaling increased during the most recent collection interval, rather than the lifetime cumulative total. For a network admin, on modern UCS blade and fabric interconnect ports this counter is expected to stay at zero, so any nonzero value is a strong hint that the reporting logic, not the link, has an issue. For example, 4 SQE test failures in the last interval on this specific FCoE path would already be worth a closer look, since this counter should normally sit at or near zero.