This read-only Gauge32 counts Ethernet frames dropped in the downstream direction toward this specific ComPort during the current 15-minute period, with the description noting these are generally dropped due to policing. It tells an administrator whether a subscriber's downstream traffic is being rate-limited by the system's traffic policer. For example, a customer complaining of choppy video streaming might show a high count here, indicating their downstream rate is exceeding the configured policing limit for that ComPort.