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 <blak...@blakjak.net> > On 15/12/11 16:38, Keegan Holley wrote: > > 2011/12/14 oliver rothschild <orothsch...@gmail.com> <orothsch...@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? > > > 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 220–550 m > (1000BASE-SX<https://en.wikipedia.org/wiki/1000BASE-SX>), > and 10 Gbit/s to 300 m > (10GBASE-SR<https://en.wikipedia.org/wiki/10_Gigabit_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 within > 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 drivers. > > Mark. > > > > >