1oo2

Redundancy architecture 1 in 2. System with two operating units, one of which is sufficient to ensure service continuity. However, in the event of e.g., software failure of a component, barring obvious conditions, the problem of deciding which unit is the efficient one may arise. Systems with redundant units may have other devices and procedures to report the failure and alert e.g., maintenance teams to take action to restore normal conditions. The high reliability of the adopted components could, e.g., allow continuity of operation during such waits. In the cao above, where only one out of two units continues to operate, the system would still be defined as being in a “critical state.”