This field is the single highest per-interval delta value on the live, currently-updating stats object for FCoE (Fibre Channel over Ethernet) payload bytes received on this converged network adapter's Ethernet uplink — the worst burst seen across the retained collection history. This is the number to check after an alert fires, since it shows the worst single interval for bytesRx on this interface even if the current live value has already settled back down. For example, a max of 347,536 bytes would capture a burst interval, such as a large backup job briefly saturating this FCoE path.