nanog mailing list archives
Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!)
From: "Robert E. Seastrom" <rs () seastrom com>
Date: 21 May 2004 08:09:19 -0400
Dan Armstrong <dan () beanfield com> writes:
Forgive me, but Isn't Sonet usually deployed in a ring? Why the heck would a fiber this important not be?
sonet, obviously, does not *have* to be in a ring, but it often is. unfortunately, a fair percentage of the time, the additional protection offered by a ring topology is a mirage, due to a configuration known as "collapsed backbone". in this instance, both pairs of fiber ride in the same conduit for some portion of the distance (most notably laterals to building entrances, but sometimes for a fair distance down the street). the driving factor in building this way is usually cost savings. while this arrangement does protect against failures of optics and electronics (which in fairness are indeed more common than fiber cuts), it provides no protection against hungry construction (or in this case, lawn maintenance) equipment. ---rob
Current thread:
- fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Robert E. Seastrom (May 20)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) P.Schroebel (May 20)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Sean Donelan (May 20)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Dan Armstrong (May 20)
- Spring time fiber cuts (was Re: fiber cut 19 May/PM -> 20 May/AM) Sean Donelan (May 20)
- Re: Spring time fiber cuts (was Re: fiber cut 19 May/PM -> 20 May/AM) fkittred (May 21)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Robert E. Seastrom (May 21)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Dan Armstrong (May 21)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Joe Abley (May 21)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Deepak Jain (May 21)
- RE: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Dan Hanson (danhanso) (May 21)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Dan Armstrong (May 20)
- <Possible follow-ups>
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) sgorman1 (May 21)
- Re: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Sean Donelan (May 21)
- RE: fiber cut 19 May/PM -> 20 May/AM in Ashburn, VA (lawnmower?!) Burton, Chris (May 21)