This counter tallies packets larger than 1518 bytes received across all ports in a group that otherwise contained no errors, meaning oversized but structurally valid frames such as tagged or jumbo frames. A rising count here on a group of standard 10BaseT ports would flag an attached device sending frames the rest of the segment was not designed to handle. An admin seeing this counter climb on group 4 would check whether a newer host with jumbo frames enabled has been plugged into that microhub.