ST2110 - SDI, 25GE host rate w/RS-FEC, 4ch HD/3G, or 2x UHD Gateway APP included, w/Ember+. SFP configuration Slot 1: 2R, Slot 2: 2R, Slot 4: RT and Slot 6: RT. ADD-on feature is required to enable 2 or 4 additional 3G Gateways for a total of 4x Encapsulation and 4x De-Encapsulation total, used in FusioN-6-B Frames.