This OID is a running total, in octets (bytes), of all inbound traffic received on this 40 Gbps Ethernet (40GbE) interface since its statistics were last cleared. This raw byte counter is the basic building block for calculating this interface's actual received throughput and utilization over any time window, by taking the difference between two samples and dividing by the elapsed time. For example, comparing this counter's value at the start and end of a business day on a 40GbE trunk aggregating several client services lets an admin calculate the average inbound bit rate the link carried and compare it against its rated capacity.