[151580] in North American Network Operators' Group
Re: Muni Fiber
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Sun Mar 25 13:59:13 2012
Date: Sun, 25 Mar 2012 10:58:20 -0700
From: Leo Bicknell <bicknell@ufp.org>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <4F6F47D0.6020106@foobar.org>
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In a message written on Sun, Mar 25, 2012 at 05:29:04PM +0100, Nick Hilliar=
d wrote:
> most of the expense of laying fibre is associated with ducting + wayleave.
> Once you have that in place, blowing new fibre is relatively inexpensive.
> So rather than amortising the cost according to the lifetime of the fibr=
e,
> it makes much more sense to amortise over the lifetime of the ducting.
Maybe.
In rural deployments it's much more likely the fiber is aerial,
it's far cheaper to attach to existing poles with few cables on
them than it is to bury the fiber.
Even in urban areas where buried duct is the norm, being able to
use old ducts varies a lot with the geography and how active the
area is to other development. I've seen plenty of ducts where it
had been cut and repaired several times before use that running a
new cable through it was impossible and it simply had to be replaced.
In other locations 20 years later a new cable goes through like
butter.
But I think it's all a bit of a tangent; when talking about
_residential_ fiber it's prudent to run 2-6 strands to every home
day one, and then, well, there's basically never a point in running
more. The chance of blowing more fiber down the duct later is near
zero. It's also why I'm not a fan of *PON schemes, eliminate the
splitter and run a single star topology. 20 years from now Petabit
optics will look different than today's GigE in some way, but I'll
bet money they are tuned to run on single mode fiber. They may not
like the splitters and the like though. By doing a star back to a
wiring center you enable all technologies. GPON today, direct GigE
or 10GE where necessary, and all future technologies.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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