TransAtlantic 40 Gig Waves
Richard A Steenbergen
ras at e-gerbil.net
Fri Aug 14 13:17:45 UTC 2009
On Fri, Aug 14, 2009 at 10:14:59AM +0100, Rod Beck wrote:
> Obviously using 40 gig waves as the foundation blocks of one's network
> provides some economies of scale and per unit capex cost savings.
>
> I would be curious if anyone knows how to convert this SONET/SDH 40
> gig waves into a 40 gig Ethernet handoff?
>
> Afterall, OC768 route cards are a tad expensive ...
I'm not aware of any solution that isn't going to be a lot more
expensive than just using the native OC768 card (which isn't "that"
expensive in crazy bankrupt carrier dollars, it's just not in the same
ballpark as 10GE solutions). This in turn is going to be a lot more
expensive than just running 4x10GE, for the moment. Of course native
40GE is in the works, so eventually this will make technical and
financial sense, just not yet. But this is one of the major reasons I've
been a proponent of 40GE standardization instead of focusing solely on
100GE, 40 maps directly to the next-generation optical technology and
allows you to efficiently and affordably transport ethernet over long
distances, whereas 100 is largely just a fancy cable management solution
for hiding multiple parallel links (i.e. 10x10G) within a datacenter.
Rod, do you know if the 40G waves increased the spectrum efficiency of
your fiber? On land systems they pretty much break even, i.e. you can
have a 100GHz 40G channels or 4x25GHz 10G channels but at the end of the
day you still get the same amount of signal out of the fiber. I don't
know whats being done on undersea cables though. Eventually this will
get better too, and 40G will become the "native" wavelength standard
with 10G being muxed onto them, similar to what we saw with the
transition from 2.5G->10G 10 years ago.
--
Richard A Steenbergen <ras at e-gerbil.net> http://www.e-gerbil.net/ras
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