The industry-leading flagship optical access platform OLT is adopted to realize multi-standard coexistence and smooth upgrade of GPON/10G PON/50G PON, and provide uplink and downlink symmetrical Gigabit bandwidth access capabilities, which can meet the requirements of video bearer, Wi-Fi 6 coverage, VR and other high-bandwidth business requirements, and can be easily and smoothly upgraded to 10 Gigabit;