Last event reported by the transport layer. Options: 1. notApplicable(1) -the last event reported by the transport layer is not applicable 2. other(2) -the last event reported by the transport layer is other 3. linkUp(3) -the last event reported by the transport layer is link up 4. linkLoss(4) -the last event reported by the transport layer is link loss 5. persistentError(5) -the last event reported by the transport layer is persistent error 6. linkShutdown(6) -the last event reported by the transport layer is link shut down 7. switchOver(7) -the last event reported by the transport layer is switch over