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William

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links links links, bork, bork, bork! [Jun. 1st, 2006|07:38 pm]
William
This'll be a long one. Lets create two subsets:




This one is written for all you budding network engineers

So, some of you may know I work for a transit agency with a monthly ridership in the low millions. We're building a multipurpose metropolitan area network to run various services on, such as security cameras, ticket machines, signs, loudspeakers, irrigation controllers, and non-safety related performance information. This network will consist of about 50 nodes arranged physically in a vague figure-8, and spreads across an area of about 551 square km. Each node is connected via a minimum of 144 strands of single mode fiber; I get to use at most 12 (preferably six) strands to construct a highly redundant looping path that can survive the destruction of any node, and the loss of any single link while maintaining strictly less than 8 hops to the core. Further, it can suffer the loss of any set of physically adjacent conduit(s) (e.g. attack of a fiber seeking backhoe) yet still have a path to 90% of the nodes.

This does not lend itself to the core->distribution->access paradigm of my CCNA days, but it does allow me to dust off that CCNP training and relearn the fun rigors of OSPF... or, I suppose, rSTP, but convergence with that one is tricky in the backhoe case.



I read a lot of disaster books. Not techno thriller broken arrow type disasters, but real ones. See this picture of my bookcase for details. I also read a newsgroup digest from comp.risks regularly. The latest update has three interesting things:

1) [re: hosting providers] "One place I looked at promised backup power. Then when I asked to see it,
they explained that they only had the fittings and a contract for a backup
generator that would be delivered in a couple of hours. Given that they are
in San Francisco, that's a stupid plan, my-nurse-only-lets-me-use-a-spoon
stupid; in an earthquake, their provider wouldn't have enough generators and
probably wouldn't be able to deliver them anyhow."[1]
[1]http://ask.slashdot.org/askslashdot/06/05/26/0034248.shtml

2) "[T]oday's *LA Times* featured a photograph of a self-pay
parking kiosk with a mis-set date of 16 May 1943, showing an amount due of
$8,082,022.84.

"Sanity checking, you ask? Not bloody likely. An auxiliary display shows
the fee in larger characters; it reads 8.1E 6. When you have an programmer
so clueless as to calculate money values in floating point, there is little
hope for subtleties like sanity checking."

3) Finally, have a look at the picture in this guys blog post.

--
Dawn Pizzini of the Information Technology Services Division is quoted as
saying, "We would have never assumed that that many components in that piece
of equipment would fail."
linkReply

Comments:
[User Picture]From: tony_m
2006-06-02 11:40 pm (UTC)
Ooh, what a fun project!

Oh, and were you sneaking into my bookcase???
(Reply) (Thread)
[User Picture]From: jgp
2006-06-05 01:57 pm (UTC)
Just don't do something silly like putting the center point for all of this out in Rancho. Like a war zone, that place is. =)
(Reply) (Thread)
[User Picture]From: whizistic
2006-06-05 03:46 pm (UTC)
There's a pic out there re: the reason for a cable internet outage somewhere on the east coast: drive by shooting. Apparently the kevlar surrounding fiber isn't quite enough to prevent damage.

That's why we are installing in-ground :)
(Reply) (Parent) (Thread)
[User Picture]From: jgp
2006-06-05 05:30 pm (UTC)
Nice. Glad to see that your employer is fully abusing utilizing their intern this summer. =D
(Reply) (Parent) (Thread)