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 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. 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 would suspect similar results cross-vendor but YMMV) Jeff
