[30290] in North American Network Operators' Group
Re: Sonet protection usage
daemon@ATHENA.MIT.EDU (Sean Donelan)
Wed Jul 26 02:43:01 2000
Date: 25 Jul 2000 23:41:00 -0700
Message-ID: <20000726064100.24757.cpmta@c004.sfo.cp.net>
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To: danny@tcb.net
From: Sean Donelan <sean@donelan.com>
Cc: nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
On Tue, 25 July 2000, Danny McPherson wrote:
> > Of course, the usual failure mode is backhoe fade, not electronics.
> > In which case, that APS circuit was cut along with the rest.
>
> Of course, backhoes don't normally work inside PoPs, which is the application
> of APS I was referring to. Routers do fail though (often more than links),
> and APS has been demonstrated to work relatively well for protecting against
> such failures.
Although backhoes are often publically identified as the cause of problems,
it turns out 71% of the reportable telephone outages last quarter were due
to problems inside the carrier's control (i.e. inside the C.O.) according
to ATIS/NRSC's calaculations.
CO's are dangerous places for network equipment.
