mailing list archives
Re: Range using single-mode SFPs across multi-mode fiber
From: Chuck Anderson <cra () WPI EDU>
Date: Wed, 14 Dec 2011 22:46:39 -0500
On Wed, Dec 14, 2011 at 10:38:47PM -0500, Keegan Holley wrote:
2011/12/14 oliver rothschild <orothschild () gmail com>
Thanks to all who responded to my clumsy first question (both on
matters of etiquette and technology). The group I work with (we are a
small project acting as a last mile provider) was in the midst of
deploying this solution when I posed the question. We put the single
mode Juniper SFPs (LX) on to a run of approximately 1670 meters.
How did you end up with a MM run this long? SX optics are only rated at
500 meters at best. Even with mode conditioning jumpers more the 1km is a
risk. I'm glad it held up during testing though. Just out of curiosity
did you purchase dark from a provider? Is it inside of a building?
In my case, it was installed for compatibility with FDDI, and used
mostly for 10BASE-FL and 100BASE-FX, which work up to 1 or 2km, until
we started using it for 1000BASE-LX.