... network core. Down link port, optionally 1~8 GEPON optical port, Through Optical splitter together with Optic Network Unit (ONU), it ... interface port LC, TX wavelength: 1310nm, distance: 10Km 5. Giga single mode optical port module, SFP, interface port LC, TX wavelength: ... 1310nm, distance: 20Km 6. Giga single mode optical port module, SFP, interface port LC, TX wavelength: 1310nm, ...