cmHSSIOperState is a read-only enumeration reporting whether a HSSI port is currently operationally up (enabled) or down (disabled), reflecting its actual working condition rather than its administrative setting. An administrator monitors this to detect a HSSI circuit outage even when the port's admin state is correctly enabled. For example, if cmHSSIAdminState shows enabled but cmHSSIOperState shows disabled, the operator knows there's a real fault on the circuit or connected equipment rather than a configuration issue.