transition from an up state to a disabled state 
Figure 5 – Outage occurrence relationships Note 1 to entry: The up state could be the operating state, the standby state, or the idle state. Note 2 to entry: The outage occurrence comprises one or more simultaneous or sequential transitions resulting in the outage of one or more items. Note 3 to entry: The outage occurrence is a failure if the resulting outage is a fault.
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