So I have Startech and Tripplite SFP+ modules. They both worked (mixed) in my 1st link from server room in main building to my IT office. 10GB no problem.   The configuration is as such: Meraki MS220 switch -> StarTech SFP+ module -->--> Tripplite SFP+ module -> Netgear ProSafe Switch   When the two new buildings went up and fiber was run to them, I bought 2 each of the same StarTech and Tripplite modules. Those did work to get another building up. They did not work to get the 3rd building connected. 3rd building is currently using copper until I can figure it out.   My inventorying is bad. But I think I've found a spare switch to try. I"ll be able to try this on Thursday when back ... View more