Editing Availability (section)

=== Basic example===
If we are using equipment which has a [[mean time to failure]] (MTTF) of 81.5 years and [[mean time to repair]] (MTTR) of 1 hour:

: MTTF in hours = {{math|1=81.5&nbsp;×&nbsp;365&nbsp;×&nbsp;24&nbsp;=&nbsp;713940}} (This is a reliability parameter and often has a high level of uncertainty!)

: Inherent availability (Ai) {{math|1= = 713940 / (713940+1) = 713940 / 713941 = 99.999860% }}

: Inherent unavailability {{math|1= = 1 / 713940 = 0.000140%}}

Outage due to equipment in hours per year = 1/rate = 1/MTTF = 0.01235 hours per year.
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That was the case if we are using 1+0 link.. if we are using 1+1 we would use below formula to calculate availability

A= Under root  of MTBFa/MTBFa+20ms * MTBFb/MTBFb+20ms
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