Melco S100 also has a slot for a module. By the way, the Teradac switch is like the layout of the Melco S100. Only the Teradac has an additional clock and comes with a linear power supply for half the price of my Melco Switch. 
Converters are also available from Melco. There rs is now an update to SFP single. It is important that the SFP modules harmonize together. You can choose this freely with the Teradac 212. Maybe there are people here with experience which fiber optic modules and conductors are the ideal ones. Greetings Andrew
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