On Mon, Feb 4, 2013 at 6:29 PM, Masataka Ohta < mohta@necom830.hpcl.titech.ac.jp> wrote:
Scott Helms wrote:
Unbundled copper costs about $10/M or so, which means SS fiber can't be more expensive.
I'm not sure what you're trying to describe here, the cost of fiber from an ongoing standpoint isn't strongly correlated to the architecture. Upgrades to the fiber and adding service to new areas is a different animal.
They are not soo different, as long as you try to recover initial cost not so quickly, which is why copper costs about $10/M or so.
I know several dozen companies that do this kind of construction and they don't agree.
it is stated that "Trenching consists of 70-80% of the total cost for infrastructure build".
Trenching != cabling and the total initial CAPEX is less than 25% of the total cost over 10 years.
My statement of "cable laying" includes trenching, sorry if it is not clear.
And, you can see the slide contain "POP Active Equipment Cost", which you thought "most of the cost is in lighting the fiber", is already included.
Google is making their own access gear. Their economy is very very different from all of us here.
No, their existing equipment was Adtran, Calix, Occam, Alcatel, Zhone, AFC, and a host of others but not SS copper or MDF. By MDF I assume your'e talking about main distribution frame which has nothing to do with the discussion here.
If you throw away optical MDF, there is no point to discuss L1 unbundling.
OK, historically the main distribution frame was where all of the copper pairs came into a central office note that a phone company often had several central offices to cover their territory in the time before there were remotes (Digital Loop Carriers). Today even when you home run all of your fiber connections you bring it to a central patch panel(s) which really doesn't look like a main distribution frame. From a logical standpoint that central set of patch panels is similar to a MDF but I personally don't think about them the same way because a MDF is constructed very differently. (Google wire wraping telco tool)
Surely, transition from copper to fiber is not trivial, but it helps a lot that fiber cables are thinner than copper cables.
Really, so you think that the thickness of the cable has an impact on how much it should cost? So, tell you what I'll exchange some nice thick 10 gauge copper wire for 4 gauge platinum, since its much thinner that ought to be a good trade for you, right? ;)
My point is that a conduit capable of storing additional 10 guage copper can, instead, store 10 guage fiber.
Or, if you assume a conduit without any extra space, upgrading to PON is also impossible.
OK, twisted pair cabling isn't run in conduit. Its not pulled the way that fiber is. Twisted pair plant is in a wiring bundle with a certain number of pairs in that bundle. You cannot remove the twisted pair in whole or part and then run fiber through that cabling. You can of course use the same trench IF you have buried cable and there is room. If you have aerial plant (common in rural telco deployments, less common in muni networks) you can also string your fiber on the same poles that you either own or have attachment rights to but the thickness of the cable doesn't change your costs any.
Masataka Ohta
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