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five nines

   Also found in: Wikipedia 0.03 sec.

five nines

Refers to 99.999% uptime that telephone companies are fond of stating as the reliability of their networks. It is often debated whether, in fact, that is truly what is delivered.



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Statewide, the Saugus district earned six 10s, five nines, an eight and seven.
Services should meet the five nines standard (see below).
This feature will allow operators to realize the four to five nines reliability figures they have long pursued.
 
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