This reports the actual negotiated link speed this physical FC port is currently running at, as opposed to any speed an admin configured or the maximum the hardware supports. For this port, comparing operSpeed against the expected design speed is a standard first check when storage throughput looks lower than expected, since a port can link up successfully at a lower speed than intended without raising any fault. For example, a port designed to run at 32Gbps but showing an operSpeed of 16Gbps after an SFP swap indicates the wrong-speed transceiver was installed, even though the link itself is up.