On Jan 29, 2013, at 20:36 , George Herbert <george.herb...@gmail.com> wrote:
> On Tue, Jan 29, 2013 at 8:10 PM, Leo Bicknell <bickn...@ufp.org> wrote: >> In a message written on Tue, Jan 29, 2013 at 07:46:06PM -0800, Owen DeLong >> wrote: >>> Case 2, you move the CO Full problem from the CO to the adjacent >>> cable vaults. Even with fiber, a 10,000 strand bundle is not small. >>> >>> It's also a lot more expensive to pull in 10,000 strands from a few >>> blocks away than it is to drop a router in the building with the MMR >>> and aggregate those cross-connects into a much smaller number >>> of fibers leaving the MMR building. >> [snip] >>> But what happens when you fill the cable vaults? >> >> It's really not an issue. 10,000 fibers will fit in a space not >> much larger than my arm. >> >> I have on my desk a 10+ year old cable sample of a Corning 864 >> strand cable (36 ribbons of 24 fibers a ribbon). It is barely >> larger around than my thumb. Each one terminated into an almost-full >> rack of SC patch panels. > > It's more than just terminating it; the bulk fiber is not free. And > it's not the customer end where you see congestion; unless you > (expensively) splice out in the field at intermediate aggregation > points, for a say 10,000 customer "wire center" you have 10,000 x the > individual cable cross section area at the convergence point. Which > you have to provision end-to-end unbroken as splicing is likely to > screw with your overall cost model in an atrocious way. Unlike all > the other media. > This can be addressed by the fiberoptic equivalent of Telco "B Boxes" out in the neighborhoods. You run a large fiber bundle to the "B Box" (or series of B Boxes) and run the individual fiber bundles from the B Box to each house in the immediate neighborhood. Same model as the current Telco F1/F2 cable bundles, etc. > It's a pain in the ass to provision in a way that you can centralize a > L1 dark fiber service, because of splices. If you're providing L2 > then you don't splice, you just run to a pole or ground or vault box > and terminate there, and have a few 10G or 40G or 100G uplink fibers > from there to your interchange point "wire center". If you're > providing L1 then that's an amazingly complex fiber pull / conduit / > delivered fiber quality / space management problem at the wire center. > I don't think this is necessarily true if you include the possibility of passive LC patching at the neighborhood level. Owen
