This tallies packets discarded because the modem's internal router queue had no room left to hold them. A rising count here means outbound traffic is arriving faster than the router can queue and forward onto the WAN link, pointing to undersized queue buffers or a traffic burst that exceeds the configured egress rate. For example, 50 drops occurring only during a backup job that briefly floods the LAN interface would point to a burst overrunning the queue rather than a chronic bandwidth shortage.