I've ordered 10 GLC-LH-SM=. I know, that on MMF Cable it runs up to 550m, with SMF up to 10km. ;-)
I try to test to SFP but I couldn't see any link coming up either with SM neither with MM fibre cables.
I also try on a working link, about 3km SMF, but with the new SFP's the link never comes up.
I'm a little frustrated. Could it be that a full serie of SFP doesn't work?
Thank for any hint or help.