I am lucky to work for a telco, so am able to get dark fiber runs between locations; however, I ran into an issue of finding SPF's that would work with the Netgear M4300's over a single strand. I am happy to say that a SFP vendor stepped up and can now supply SFP's that will work fully with the M4300 series (and the M4100's). This vendor is Percision Optical Transceivers and can be reached at sales@precisionot.com +1(585) 500-4090. They have produced units for me that run 10KM, 20KM, 40KM, and 80KM.
