[147577] in North American Network Operators' Group
Re: Range using single-mode SFPs across multi-mode fiber
daemon@ATHENA.MIT.EDU (Chuck Anderson)
Wed Dec 14 22:47:36 2011
Date: Wed, 14 Dec 2011 22:46:39 -0500
From: Chuck Anderson <cra@WPI.EDU>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <CABO8Q6T0YKxipW8R1vSDHh-pL8fmG3pXjPavybQiN3=6mdeVsg@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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.
