Explanation of Solution
Downtime calculation for 99% reliability:
When the carrier is 99% reliable, then it means that it is 1% unreliable.
Formula for computing the downtime is given below:
Substitute “1%” for “Unreliable percentage” and “365” for “Number of days in a year” in the Equation (1)
Explanation of Solution
Downtime calculation for 99.5% reliability:
When the carrier is 99.5% reliable, then it means that it is 0.5% unreliable.
Substitute “0.5%” for “Unreliable percentage” and “365” for “Number of days in a year” in the Equation (1).
The number of downtime is 1.825 days.
Note: 1 day = 24 hours.
Therefore, the number of downtime hours is “43.8” hours.
Downtime calculation for 99.9% reliability:
When the carrier is 99.9% reliable, then it means that it is 0.1% unreliable.
Substitute “0.1%” for “Unreliable percentage” and “365” for “Number of days in a year” in the Equation (1).
The number of downtime is 0
Explanation of Solution
Minimum reliability:
Most firms need the reliability of a common carrier to be “100%”. However, this is not a feasible.
The closest reliability percentage most firms consider would be “99.99%” or “99.9%”. Since, their downtime of these reliabilities is less than 9 hours...
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BUSINESS DATA COMMUNICATIONS AND NETWORK
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