What is five nines?

The Telecos and RBOCS believe they have to great features – High Availfive-nines_on_worldability and High Line Quality. The old commercial from US Sprint “You could hear a pin drop” was reminiscent for what this is about.

In any case, “five nines” meant you had “high availability” for a service. It is still widely used in the industry, but often ignored.

On this topic, the direct translation means

  • 99.999% uptime is just over 5 minutes per year of down time.
  • 99% uptime means 3 days per year – down.
  • 98% uptime means 7 days per year or about 30 minutes a day – down.



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