On Wed, 19 Nov 2008, Steven Fischer wrote:

looks like a single break....Baltimore is about 36.4 miles north of Washington, and Laurel is about 16.25 miles north of Washington, with Baltimore being about 20 miles north of Laurel. All this makes sense. The part that doesn't really make sense is that our headquarters in right smack-dab along this run in Columbia, MD (about 5-7 miles north of Laruel), and has been unaffected...but a remote office in Hagerstown, about 50-60 miles west, north-west of here, is down hard.

The circuit between you and your remote office could be DACS'd across several SONET rings between point A and B and if the cut took out one of those rings then you'd lose your circuit. Also, keep in mind that carriers love to call SONET rings redundant even when both the working and protect sides of it ride in the same conduit, or hell, even in the same buffer. That makes them a little more susceptible to backhoe fade. There are other possibilities as well, such as the protect side of the ring being down for maintenance when something hits the working side, the carrier screws up a re-groom, etc... jms