This read-only Counter tracks the count of times the CPE could not receive a frame because no CPE buffer was available on the CPE's Ethernet interface, tallied per hourly interval. Operationally, it points to the CPE running out of internal memory to hold incoming frames, which causes silent frame loss even though the wire itself is fine. For example, if this counter rises during peak hours, it suggests the CPE's buffer pool is undersized for the customer's traffic bursts and frames are being dropped internally.