[116758] in North American Network Operators' Group
RE: TransAtlantic 40 Gig Waves
daemon@ATHENA.MIT.EDU (Rod Beck)
Mon Aug 17 12:19:06 2009
Date: Mon, 17 Aug 2009 17:14:22 +0100
From: "Rod Beck" <Rod.Beck@hiberniaatlantic.com>
To: "Richard A Steenbergen" <ras@e-gerbil.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Rod, do you know if the 40G waves increased the spectrum efficiency of=20
your fiber? On land systems they pretty much break even, i.e. you can=20
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=20
know whats being done on undersea cables though. Eventually this will=20
get better too, and 40G will become the "native" wavelength standard=20
with 10G being muxed onto them, similar to what we saw with the=20
transition from 2.5G->10G 10 years ago.
--=20
Richard A Steenbergen <ras@e-gerbil.net> =
http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 =
2CBC)
"Rod.
This is direct from engineering:
The number of wavelengths or channels Hibernia have on their DWDM =
infrastructure remains the same, however now each wave can be at a rate =
of 40Gb/s instead of only 10Gb/s.
In the extreme case, we get 4 times the capacity, but in reality, =
because of the existing installed 10G's, we would not necessarily swap =
out all existing cards. We could say the overall increase in capacity is =
"up-to" 4 times.
The enabling technology is based on advanced encoding techniques =
allowing a greater rate of symbol transfer."=20
