[c-nsp] SM SFP over MM cable

[Phil Mayers]

Pavel Skovajsa wrote:
> Hello,
> 
> I have heard stories that normal LX single mode SFP works fine over
> any MM fiber. Is that true? Does it have any distance limitation? Is
> there any doc I can read so that I understand what are the various
> possibilities to mix/match various SM/MM SFPs etc.

It's true. We run LX over OM1. Of course it has a distance limitation; a 
commonly quoted figure is 550 metres.

There are various gotchas which can be resolved using "conditioned 
launch" fibre patch leads, but we haven't experience any issues. IIRC 
they're only an issue on OM1/OM2. Having said that, we have links 
running stably with LX over OM1 without mode-conditioned patch leads, so 
YMMV.

Cisco appear to have an interesting (if somewhat old) page:

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/white_paper_c11-463677.html

There are lots of hits for "LX over OM[123]"