[20593] in North American Network Operators' Group
Re: SONET ring questions
daemon@ATHENA.MIT.EDU (Alan Hannan)
Sat Oct 17 01:42:14 1998
Date: Fri, 16 Oct 1998 22:34:52 -0700
From: Alan Hannan <alan@globalcenter.net>
To: "Roeland M.J. Meyer" <rmeyer@mhsc.com>
Cc: nanog@merit.edu
In-Reply-To: <199810160935.CAA30826@condor.lvrmr.mhsc.com>; from Roeland M.J. Meyer on Fri, Oct 16, 1998 at 02:35:40AM -0700
> For total system uptime
> 90.0% (one nine or less) Desktop systems.
> 99.0% (two nines) Intermediate business systems
> 99.9% (three nines) Most business data systems and workgroup servers
> 99.99% (four nines) High-end business systems and your friendly
> neighborhood telco
> 99.999% (five nines) Bank Data Centers and Telco Data Centers, some ISPs
> 99.9999% (six nines) Only God and Norad live here.
> 99.99999% (seven nines) Even God doesn't have pockets this deep.
What's your source for this data?
-a
