The formula used to calculate Annual Service Availability is:
[Total Operational Hours - Total Number of downtime hours (fault report hours)]
Total Operational Hours |
The total operational hours are the operational hours of all active lines during the reporting period. It must include the operational hours of new lines activated during the reporting periods, and exclude the operational hours of lines that have been terminated.
For example, this is a report for the period ending December 2000.
Company A has the following Digital Leased lines:
· 3 were active as at 1 January 2000
· 1 out of the 3 lines was terminated on 30 April 2000
· 2 new lines were added on 1 October 2000
The total operational hours are:
· 2 lines were active for the whole 12 months = 2 lines x 365 days x 24 hours = 17,520 hours
· 1 line was active only from 1 January 2000 to 30 April 2000 (120 days) = 1 lines x 120 days x 24 hours = 2,880 hours
· 2 lines were added on 1 October 2000 = 2 lines x 92 days x 24 hours = 4,416 hours
Total Operational hours = 17,520 hours + 2,880 hours + 4,416 hours = 24,816 hours
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