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Circuit reliability

In telecommunication, circuit reliability ( CiR ) is the percentage of time a circuit was available for use in a specified period of scheduled availability.

Note 1: Circuit reliability is given by where T _o is the circuit total outage time, T _s is the circuit total scheduled time, and T _a is the circuit total available time[?].

Note 2: T _s = T _a + T _o. Synonym time availability.

Source: from Federal Standard 1037C and from MIL-STD-188

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