[101075] in North American Network Operators' Group
RE: IEEE 40GE & 100GE
daemon@ATHENA.MIT.EDU (Chris Cole)
Thu Dec 13 18:51:35 2007
Date: Thu, 13 Dec 2007 15:48:38 -0800
In-Reply-To: <027401c83dd5$542972b0$3b3816ac@atlanta.polycom.com>
From: "Chris Cole" <chris.cole@finisar.com>
To: "Stephen Sprunk" <stephen@sprunk.org>,
"Mikael Abrahamsson" <swmike@swm.pp.se>
Cc: "North American Noise and Off-topic Gripes" <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
The 40km optics will require optical attenuators for distances somewhere
below 20km, possibly for 10km or less. They will certainly require
optical attenuators for 4km distances.
Chris=20
-----Original Message-----
From: Stephen Sprunk [mailto:stephen@sprunk.org]=20
Sent: Thursday, December 13, 2007 1:52 PM
To: Chris Cole; Mikael Abrahamsson
Cc: North American Noise and Off-topic Gripes
Subject: Re: IEEE 40GE & 100GE
Thus spake "Chris Cole" <chris.cole@finisar.com>
> The 40km/10km cost ratio is between 1.6x and 2x, depending on
> the source.
>
> The 10km/4km cost ratio is between 1.15x and 1.3x, again
> depending on the source.
If those numbers translate into prices (not costs), then I'd prefer to
see=20
40km and 4km optics, with no 10km optics. The important point is that
the=20
40km optics neet to be able to handle 4.1km links with no attenuators,=20
preferably without any human tuning at all. You only pay the extra
capital=20
cost once (if there even is any, due to more volume of fewer parts), but
you=20
pay labor and sparing over and over.
S
Stephen Sprunk "God does not play dice." --Albert Einstein
CCIE #3723 "God is an inveterate gambler, and He throws the
K5SSS dice at every possible opportunity." --Stephen Hawking=20
