This enumerated value (none, chksumFailed, or opticalFault) reports why a specific transceiver identified by its port and transceiver ID has been detected as faulted. This object is carried inside the wwpXcvrErrorTypeNotification trap so that when a transceiver fault is detected, the notification tells an admin whether it was a checksum failure (bad EEPROM identification data) or an optical fault (such as a failed laser); otherwise it returns none. For example, a trap carrying this object set to opticalFault(2) tells an admin the identified transceiver has an optical-level fault rather than a data-integrity problem.