可以參考一下，整理的不錯
http://fwengineer.blogspot.tw/2013/04/blog-post.html
Tuesday, May 6, 2014
Monday, May 5, 2014
What is the system with "Carrier Grade"?
A system can provide the high reliability with "five nine" => 99.999 %
- See also
http://en.wikipedia.org/wiki/Carrier_grade
- See also
http://en.wikipedia.org/wiki/Carrier_grade
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