[outages] Major Fiber Cut in Miami

[Ken J Guy]

I'm sorry to be a kvetch, but it seems to me that a simple outage 
notification on the "Outages" list has turned into a colloquium on SONET 
failure modes.  If I should be in a different venue please flame away, but 
the SNR here for "Outages" lately is sometimes as bad as NANOG.

Ken Guy
Network Architect
AM Best Company



From:
"George Bonser" <gbonser at seven.com>
To:
<frnkblk at iname.com>, "Owen DeLong" <owen at delong.com>
Cc:
outages at outages.org
Date:
03/05/2011 04:52 PM
Subject:
Re: [outages] Major Fiber Cut in Miami
Sent by:
outages-bounces at outages.org





> On Behalf Of Frank Bulk
> Sent: Saturday, March 05, 2011 1:27 PM
> To: 'Owen DeLong'
> Cc: outages at outages.org
> Subject: Re: [outages] Major Fiber Cut in Miami
> 
> While you're technically correct, it's not how it's commonly
> implemented.
> Well, maybe it's more common than I was aware. =)  It's not how
> regional and
> state fiber networks in our neck of the woods do it.
> 
> Frank

Concur.  If a customer buys a "ring" they expect a ring.  Protection is
implied.  If they buy a point-to-point, that is a different story.  A
protected point-to-point might be provisioned on a ring or it might be
provisioned with two separate point-to-point circuits.

A "SONET ring failure" would require two faults.  That said, I have seen
cases where both sides of the ring enter a building by the same trench
allowing one case of backhoe fade to take out the entire building. 


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