This read-only PerfTotalCount reports the count of receive frames discarded for lack of available buffers on the DSL port, scoped to the most recent rolling 24-hour period ending at the moment of the poll. Operationally, buffer exhaustion causes silent frame loss even when the physical line itself is clean, pointing to a resource or congestion issue rather than a wiring fault. For example, a capacity-planning report pulling this rolling 24-hour buffer-exhaustion total across all ports can identify which lines chronically run short on buffers.