Outage
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In telecommunications, an outage is a telecommunications system service condition in which a user is completely deprived of service by the system. In the power generation industry an outage is a power service condition where a power consumer is completely deprived of power by the system.
Note: For a particular system or a given situation, an outage may be a service condition that is below a defined system operational threshold, i.e., below a threshold of acceptable performance. See outage threshold.
Source: from Federal Standard 1037C and from MIL-STD-188