[AusNOG] Solar flare
pbrooks-ausnog at layer10.com.au
Thu Mar 8 17:54:21 EST 2012
On 8/03/2012 5:03 PM, Scott Howard wrote:
> On Wed, Mar 7, 2012 at 9:47 PM, Peter Childs <PChilds at internode.com.au
> <mailto:PChilds at internode.com.au>> wrote:
> > As with all computer and networking devices, the AS5400 is susceptible to
> > the rare occurrence of parity errors in processor memory. Parity errors may
> These excuses may seem far-fetched, and I used to get a lot of unbelieving looks
> when I gave this excuse when I was an engineer at Sun - but the simple fact is that
> it IS true.
> And by true, what I mean is that cosmic rays can and do cause bits to flip,
> especially in the type of memory used in CPU caches. What may or may not be true is
> if any specific occurrence was due to cosmic rays - because obviously there's no way
> to prove that one way or another!
As someone who has used and built cosmic-ray and gamma-ray telescopes in the past, I
can vouch for this.
Cosmic-ray hits show up well in long time exposures of CCD chips
- which is just an array of silicon memory gates at the end of the day.
And if your router is in the cone of a cosmic ray air-shower cascade of subatomic
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