This trap is generated on the following events: - Local SF is received for the ring (Auto Trap). - Local Clear SF is received for the ring (Auto Trap). - Remote failure is detected on this ring (Auto Trap). - Remote failure is cleared on this ring (Auto Trap). - Force Switch (Local FS) is issued for a ring (ForcedSwitch). - Manual Switch (Local MS)is issued for a ring (ManualSwitch). - R-APS FS is received on a ring (Auto Trap). - R-APS MS is received on a ring (Auto Trap). - After Clear command is issued on a ring (Auto Trap). - After a ring is moved to Disabled state (Auto Trap).