The Active Switch APS request: optApsRevertive : Switch back to working connection after the Wait-to-Restore interval is over, and failures are cleared. It is the lowest priority. optApsManual : Manual switch causes APS switch unless a request of equal or higher priority is in effect. optApsSignalFailure : Switch due to signal failure. optApsForceSwitch : Forced switch forces hardware to switch the active connection even if the other connection (could be working connection or protection connection) is in alarm. optApsLockOut : This is the highest priority switch. This will override all other requests. optApsLockOut : indicates that the last switchover to the working occurred because of protection lockout.