2011/12/14 Jeff Kell <[email protected]> > On 12/14/2011 3:37 PM, Keegan Holley wrote: > > > Single mode just has a smaller core size for the smaller "beam" emitted > by > > laser vs. LED. it works although I've never done it outside of a lab (MM > > is cheaper). As for the distance it theory that should come down to the > > optics and your transmit power. Hopefully this is just a cable > connecting > > the router to a long line. I've never heard of a 10K MM fiber run since > SX > > optics can't shoot that far. You should be able to get through the 500m > or > > so that MM optics are rated for, but YMMV (errors, light levels, bounces, > > etc etc) > > Cisco gives specs for SFP LX over MM (they aren't that great at gig, and > really suck at > 10G; if you have 50u OM3/OM4 you can do much better at 10G). > > See SFP/fiber/distance table at > > http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html > > They specify that line conditioning cables were used. I would say if you're going to bother purchasing why not purchase SM?
> We have run LX-over-MM (62.5) on short building runs as a band-aid until > SM is > available, and trying to do all new building MM with 50u OM3/OM4. We do > have some > dependence on 62.5u MM - used by our aging Simplex alarm system - which > does > point-to-point looped token ring <*cough*> on the alarm side. What distances? > I'm trying to get them to confirm 50u will work point-to-point, but at > some non-alarm-points there would be a > necessary 50-to-62.5 exchange taking place and I'm not certain how to > accomplish that > (50->62.5 would likely have tolerable loss, but not 62.5->50). > > I don't think changing core sizes in the middle would work even with SM optics.
