This object is a read-only HpnicfFcBbCredit giving the maximum number of buffers available for a recipient to receive Class 2/Class 3 frames from the logged-in Nx_Port, used in buffer-to-buffer flow control from that Nx_Port toward the Fx_Port. It lets a SAN administrator verify the buffer credit negotiated for a device, which affects how much unacknowledged data can be in flight and thus throughput over distance. For example, a low RxBbCredit value on a long-distance FC link could explain reduced throughput and prompt the admin to check buffer credit configuration.