[70684] in North American Network Operators' Group
Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!)
daemon@ATHENA.MIT.EDU (sgorman1@gmu.edu)
Fri May 21 10:36:39 2004
Date: Fri, 21 May 2004 10:35:52 -0400
From: sgorman1@gmu.edu
To: Joe Abley <jabley@isc.org>
Cc: "Robert E. Seastrom" <rs@seastrom.com>,
Dan Armstrong <dan@beanfield.com>, nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
This is from a previous thread on the topic of fiber cuts but I thought i=
t fit this discussion well=2C epsecially since it concerns Verizon=2E Ap=
ologize for not being able to recall who originally posted it - only have=
the citation=2E
In an August 5th=2C 2003 court case involving the Maine Public Utility Co=
mmission an expert witness from Verizon stated that only 10=25 of the fib=
er rings in Maine are fully redundant=2C and 90=25 are at least partially=
collapsed and vulnerable to single cut failures (Maine PUC=2C 2003)
Maine PUC=2C 2003=2C =93Docket Number 2002243=94 http=3A//www=2Estate=2E=
me=2Eus/mpuc/misctranscripts/2002-243=2520080503=2Ehtm =
Appears it should not be a suprise at all it was not redundant=2E On a r=
elated note another researcher at GMU has collected all the outage report=
s that =22were=22 posted on the FCC website and put them in a database fo=
rm=2C and we are going to try and run correlations between outage locatio=
n and the density of fiber located there=2E =
----- Original Message -----
From=3A Joe Abley =3Cjabley=40isc=2Eorg=3E
Date=3A Friday=2C May 21=2C 2004 10=3A23 am
Subject=3A Re=3A fiber cut 19 May/PM -=3E 20 May/AM in Ashburn=2C VA (law=
nmower=3F!)
=3E =
=3E =
=3E On 21 May 2004=2C at 08=3A09=2C Robert E=2E Seastrom wrote=3A
=3E =
=3E =3E sonet=2C obviously=2C does not *have* to be in a ring=2C but it o=
ften is=2E
=3E =3E unfortunately=2C a fair percentage of the time=2C the additional
=3E =3E protection offered by a ring topology is a mirage=2C due to a
=3E =3E configuration known as =22collapsed backbone=22=2E in this insta=
nce=2C both
=3E =3E pairs of fiber ride in the same conduit for some portion of the
=3E =3E distance
=3E =
=3E =2E=2E=2E or even as two wavelengths on the same pair of fibre=2E
=3E =
=3E It=27s a sick=2C sick=2C twisted world=2E
=3E =
=3E =
=3E Joe
=3E =
=3E =
=3E
