TIA's Glossary of Telecommunication Terms
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circuit reliability ( CiR )
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. (188) Synonym time availability.