Outage

In telecommunication, an outage is a telecommunications system service condition in which a user is completely deprived of service 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