Muni fiber: L1 or L2?

Mon Feb 4 23:29:41 UTC 2013

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.

>> 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.

> 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.

>> 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.

						Masataka Ohta