This Gauge32 gives the finalized count of Ethernet receive FIFO overflow events on a receive queue during the previous 15-minute period. As a closed sample it allows an engineer to build a history of buffer-overflow events and see whether they cluster at particular times, pointing to a load-related rather than a hardware cause. For example, a pattern of elevated stuPrevEtherRxOver values only during specific hours would suggest the STU's receive buffering struggles under peak traffic rather than being a constant hardware defect.