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Re: Range using single-mode SFPs across multi-mode fiber
From: Chuck Anderson <cra () WPI EDU>
Date: Wed, 14 Dec 2011 22:33:01 -0500

On Wed, Dec 14, 2011 at 10:02:58PM -0500, oliver rothschild wrote:
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. We
successfully established a 1G ethernet connection. Testing to date has
been meager, but shows that the link is viable. Under significant load
there is some minor packet loss. Since the link far exceeds the amount
of data it required, we have decided to continue using it.
Interestingly neither interface showed any physical errors.

Technically you should be using offset-launch "mode conditioning"
patch cords at each end when running LX over multimode fiber.  I had
been lucky with not using them for many years on 62.5/125 (OM1)
multimode (and just started doing so again, albiet only for
OOB/non-production traffic use).  I believe my longest link was/is
around 1 km.


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