csOc3AtmIntervalRecievedCells is a read-only 64-bit counter of the number of ATM cells received on this OC3 port's ATM interface during one specific past 15-minute interval bucket. This gives an admin the same kind of after-the-fact, bucket-by-bucket visibility as the transmitted-cell interval counter but for inbound traffic, useful for correlating a reported inbound-traffic anomaly to a precise time window. For example, an admin investigating a reported spike in inbound ATM voice traffic at a known time can check the matching csOc3AtmIntervalRecievedCells bucket to confirm and quantify exactly how much higher the received-cell count was during that interval.