Five Nines reliability

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Pilgrim

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@Neotel Rep, can you please explain how you calculate your five nines reliability as per this article: http://mybroadband.co.za/news/index.php?news=10605

“We have 25 breaks a month [in Johannesburg] due to the massive civil works projects taking place. Regardless, we have five nines reliability in place,” said Dr. Marten Scheffer, Neotel’s Executive head of network planning.
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McGuywer said:
Sauce

Google is your friend...
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I know what five nines uptime means, I want to know how Neotel calculates their uptime.

With five nines uptime you cannot have more than 315.36 seconds downtime per year (365*24*60*60)*(1-0.99999)

But, according to this article: http://mybroadband.co.za/news/Telecoms/10098.html Neotel had about 3 hours downtime, 10800 seconds, 34 times more than they are supposed to have.

So, my question, how does Neotel calculate five nines reliability, when that one network failure means they can only claim five nines reliability if their network does not break again in the next 34 years?
 
@Pilgrim he might be speaking about their enterprise network not the consumer network.
 
jeanres said:
@Pilgrim he might be speaking about their enterprise network not the consumer network.
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Good point, but would a failure in their entire national backhaul network not affect their enterprise network too?

Or are they allowed to pick and choose what parts of their network they include in their reliability claims?

Hence, once again, my question to the Neotel Rep: How is the five nines reliability calculated?
 
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