I recently bought an Allnet all4708w 48-port gigabit switch with room for 4 SFP modules. But since Allnet is not exactly a known brand, how will i know what SFP modules will or will have the largest chance of being compatible with my switch. And the second SFP module does that have to be of the same speed/same manufacturer, or can i just chose what ever SFP module i like the look of and put it in any FCoE card? And is there a good way to test how much data i can push through it?