The cumulative Protection Switching Duration (PSD) time in seconds. For the working MDA, this is the cumulative number of seconds that traffic was carried on the protection MDA. For the protection MDA, this is the cumulative number of seconds that the protection MDA has been used to carry working MDA traffic. This information is only valid if revertive switching is enabled. The value 0 will be returned otherwise. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of aluLcrMdaStatusDiscontinuityTime. For example, if the value of an instance of aluLcrMdaStatusSwitchoverSeconds changes from a non-zero value to zero due to revertive switching being disabled, it is expected that the corresponding value of aluLcrMdaStatusDiscontinuityTime will be updated to reflect the time of the configuration change.