[147578] in North American Network Operators' Group
Re: Range using single-mode SFPs across multi-mode fiber
daemon@ATHENA.MIT.EDU (Keegan Holley)
Wed Dec 14 22:51:48 2011
In-Reply-To: <4EE96D85.2020907@blakjak.net>
From: Keegan Holley <keegan.holley@sungard.com>
Date: Wed, 14 Dec 2011 22:50:10 -0500
To: Mark Foster <blakjak@blakjak.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I stand corrected, but I haven't dealt much with 100BASE-FX. I was just
talking in terms of 1G/10G.
2011/12/14 Mark Foster <blakjak@blakjak.net>
> On 15/12/11 16:38, Keegan Holley wrote:
>
> 2011/12/14 oliver rothschild <orothschild@gmail.com> <orothschild@gmail.c=
om>
>
> 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?
>
>
> Um.. check that.
>
> https://en.wikipedia.org/wiki/Multi-mode_optical_fiber
>
> "Typical transmission speed and distance limits are 100 Mbit/s for
> distances up to 2 km (100BASE-FX<https://en.wikipedia.org/wiki/100BASE-FX=
>),
> 1 Gbit/s to 220=96550 m (1000BASE-SX<https://en.wikipedia.org/wiki/1000BA=
SE-SX>),
> and 10 Gbit/s to 300 m (10GBASE-SR<https://en.wikipedia.org/wiki/10_Gigab=
it_Ethernet#10GBASE-SR>
> )."
>
> The old OM1 installations I used to work on started out as 10Mbit hubbed
> ethernet links and on the odd occasion would run out to close to 2km with=
in
> a campus. They were progressively upgraded with the flow of:
>
> 10FX on 3Com Linkbuilder Kit
> 100FX on 3Com Corebuilder Kit and Allied Telesyn 100FX Media converters
> 1000SX on a variety of 3Com, Nortel and Cisco kit out to ~220m
> 1000LX via Mode-Conditioning out to ~900-1000m.
>
> The OM1 only got retired when the distance was >900m or there was budget
> to put new fibre on the run, in which case we ran SMF and rigged LX drive=
rs.
>
> Mark.
>
>
>
>
>
