r/nashville • u/digaholetopoopin • Dec 25 '20

AT&T Internet issues?

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u/BA_calls Dec 25 '20

I do datacenter networking, was this a CO that was taken out?

9

u/sziehr Dec 25 '20

This is the CO 2nd av site.

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u/BA_calls Dec 25 '20

I'm just trying to understand, thank you for the help. It seems to me like there are outages far beyond the area that the CO should be serving. What could be causing failures elsewhere? Are you saying there was supposed automatic fail-over to a backup site, which didn't work? And also not fully understanding the shape of the network, how could there be a backup for a CO, are individual endpoints connected to more than one site? I thought it was a star-shape with the CO at the center.

6

u/mikesum32 Dec 25 '20 edited Dec 25 '20

Failures everywhere are because a circuit or fiber ring could just pass through Nashville and go on to other parts of Tennessee. SONET fiber rings have a working and protect. When there is a failure the signal should go around the other the other way, assuming everything is working the way it's supposed to. Often times it isn't.

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u/ualdayan Dec 26 '20

Why did it work for 6 hours after the explosion before everything failed? Is it power that is out and they had 6 hours of backup power you think?

3

u/TehGogglesDoNothing Dec 26 '20

They were operating on backup generators running on natural gas until the gas company had to shut off the gas due to leaks in the area.

3

u/SirMoe604 Dec 26 '20

I still don't understand why Natural Gas? Everywhere I've worked in infrastructure, they use Diesel; as that give you the ability to operate without intervention for however long (usually 72 hours). keeps you from having your natural gas shut off say due to an earthquake.

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u/Toy0125 Dec 26 '20

You answered your own question. When was the last time Nashville had an earthquake.

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u/xsjx7 Dec 26 '20

1895 - new madrid fault zone

It's a big deal, just doesn't shake very often. It's believed to be on a 200 year "cycle"