This read-only PerfTotalCount reports the count of receive frames discarded for lack of available buffers on the DSL port, scoped to the full previous calendar day's totals for the DSL port. 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, an admin reviewing yesterday's total buffer-exhaustion count can decide whether a hardware upgrade is warranted if the number has been consistently high for several days running.