https://www.cdatatec.com/products/fd1604s-b1-4-port-gpon-olt.html FD1604S-B1 GPON 4 Port OLT GPON OLT FD1604S-B1 completely meet relative standard of ITU G.984.x and FSAN, which is 1U rack-mounted device with 1 USB interface, 4 uplink GE ports, 4 uplink SFP ports, 2*10GE uplink ports and olt gpon 4 portas. Each GPON port supports the splitting ratio of 1:128, the GPON system supports up to 512 terminal connections.All Rights Reserved