[c-nsp] Catalyst SX GBIC's and SMF

[Tristan Gulyas]

All,

I have seen an installation where mode conditioning cables are used to go 
between LX SFP modules with MM fibre.  I have no idea about the reverse (SX 
GBICs with SM fibre) although I don't see why this wouldn't be possible.

I have been told that running 1000baseLX with MM fibre + mode conditioning 
patch cables gives you "slightly better" range than using native SX, but 
there's no solid evidence for this, so I'd stick to the 550 metre spec as 
per 1000baseSX to be safe.

With respect to the original problem,  it depends on how the fibre runs 
between the cat4000s (whether it's just "across the floor" or whether 
there's cable running through a building)  It may be substantially cheaper 
to aquire a MM fibre patch cable vs. purchasing LX GBIC/SFP modules.

.t