This counter tracks the total number of low-level Fibre Channel frames transmitted on this LUN/flow, the outbound counterpart to ciscoScsiFlowRxFc2Frames. Comparing transmit and receive frame counts for the same flow lets an admin see whether the path is roughly symmetric (as expected for typical read/write mixed traffic) or heavily skewed in one direction, which can help characterize the workload (e.g., mostly reads pulling data from the target versus mostly writes pushing data to it). A flow dominated by outbound frames relative to inbound would be consistent with a write-heavy workload like data ingestion to that LUN.