This field records how much the counter for FCoE (Fibre Channel over Ethernet) payload bytes received on this converged network adapter's Ethernet uplink changed during the specific collection interval this historical record captured — a frozen snapshot of that one interval's increase, not a live running total. For a network admin, a rising rate here confirms storage traffic is actually flowing over the FCoE-encapsulated link rather than sitting idle or being routed elsewhere. For example, a value of 535,598 bytes would mean that much FCoE data crossed this uplink in just the last collection interval.