Discussion
What availability figure is typical for a microwave link design?
Answer: B
Trunk links are commonly designed for 99.99 or 99.999 per cent availability, corresponding to about fifty minutes or five minutes of outage a year, and the fade margin follows from the rain statistics at that percentage. Lower figures are accepted for less critical services. One hundred per cent is unattainable, since any margin can be exceeded by a sufficiently rare event. Availability is a design parameter with a cost, and choosing it is a commercial decision as much as a technical one.
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