I know as far as att/sbc/pacbell a lot of the time they run the ring within the same conduit to at least have hardware protection on the circuit I'm sure it's the same with other providers. -carlos -----Original Message----- From: Roy [mailto:r.engehausen@gmail.com] Sent: Saturday, April 11, 2009 6:02 PM To: nanog@nanog.org Subject: Re: Fiber cut in SF area Sean Donelan wrote:
,,,, Uh, not exactly. There was diversity in this case, but there was also N+1 breaks. Outside of a few counties in the Bay Area, the rest of the country's telecommunication system was unaffected. So in that sense the system worked as designed. ....
About eight or ten years ago I went to PacBell (or whatever it was called at the time) and requested that two large facilities get a sonet ring between them. I was told I couldn't have it because they were both fed through a single set of conduits and one backhoe could cut both sides of the ring. It wouldn't be diverse so they wouldn't provison it unless I paid for the digging of new paths. So much for their theory of diverse. Sounds like the rules are different for them. There are one thing to also point out. That train track next to the manholes in South San Jose is the major line between the Bay Area and Southern CA. There are at least three or four fiber paths for different companies buried along those tracks. There are also connections from Gilroy to the Hollister/San Juan Bautista area and thence to Salinas. It would have been very simple for the telcos to provision a backup path southward.