This read-only PerfTotalCount reports the count of valid frames successfully received on the DSL port, scoped to the running total for the current calendar day so far. Operationally, it's the baseline throughput indicator for inbound traffic, so a healthy line should keep accumulating this steadily under load. For example, an admin checking today's running valid-frame total at midday can project whether the port is on pace for a normal day's traffic volume.