RE: Verizon outage in Southern California?

["Hannigan, Martin" <hannigan () verisign com>]

> > From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On 
> > Behalf Of Matthew Black
> > Sent: Tuesday, October 18, 2005 3:13 PM
>
> > Telephone service is beginning to be restored in the Long 
> > Beach area but is still sporadic.
>
> Our ATM WAN link through Sprint came back up around 1345 Central time,
> and the two DS1s for the school's Internet service were revived about
> fifteen minutes ago (1507 CDT).  They've been rock-solid so something
> must be going right out there.
>
> When I called Sprint about any information they might have for the
> outage the tech said that the area was down due to a Verizon DACS
> failure.  That must have been a spectacular failure, because 
> I'm reading
> that it wiped out most everything (
> http://www2.presstelegram.com/news/ci_3128087  indicates four tandems
> hit?! ) in the area.  The articles are primarily focusing on 
> the impact
> to E911 services, followed with the hit to POTS lines.  I have yet to
> see any mention of impact to data in any of 'em.  Here's what 
> intrigues
> me about this outage: if it wiped out E911, most of the POTS and also
> impacted data services (as Jay Hannigan and I can attest), how did the
> cell towers that are also served by the network live through it?


The dependancy between all of those would be a DACS so that
seems to make sense. I'm guessing the impacted circuits were
DS3 or below, with Verizon providing resale of the Z ends.

I'm not sure of the relation to E911 though. Could be, but
it sounds odd since E911 has redundancies to tandems IIRC.

My guess is water on a DACS bay or complete power loss in the
CO (rarer than water on a DACS).

-M<