OLT-GX3900 is a medium-capacity modular plug-in local OLT in GX3000 series of EPON and 10G EPON products. It is connected with diversified terminals, such as remote ONU and MDU of ONU-GM2000 series, residential gateway, etc., via optical fiber and a passive optical splitter (ODN) to form an access network system of a passive optic network; Thus, it satisfies the access requirement of the optical fiber for the access network; Compared with a traditional access network, it satisfies the access requirement of high bandwidth and the requirement of multi-service access. It is mainly applied to solutions of access network integrated services of FTTH, FTTB, FTTC, FTTO, FTTP, etc. GX3900 supports a maximum of 12 PON service slots; Each PON service unit board supports 4/8/12 PONs and supports a maximum of 144 PON optical interfaces; A maximum of 9216 ONU terminals can be accessed on the remote end; GX3900 as a high-bandwidth multi-service access network platform can provide abundant service access capabilities of broadband, voice, CATV/IPTV, etc. It is designed in a telecommunication-level modular structure. It supports the configuration of double main control exchanges and double power supplies, can be flexibly configured and expanded according to users' requirements, and also supports continuous upgrade of the services. Product Features Achieve IEEE802.3ah standard, with an uplink and downlink symmetric transmission rate of 1.25G Designed in a telecommunication-level modular structure, support the configuration of double main control exchanges and double power supplies; All unit boards support hot plug Support a maximum of 12 slots and 144 PON optical interfaces, support the largest coupling ratio of 1: 64 and support the access of a maximum of 9216 ONU terminals Full kilomega backplane of 352G, with an exchange capacity of 176G Support uplink and downlink encryption function and real-time dynamic update of keys and support FEC enhanced error correcting mechanism Support flexible QoS setting and low time delay Support abundant service access for downlink, such as multi-service integrated access capability of broadband, voice, CATV/IPTV, etc., and support PSTN and NGN voice accesses for uplink Support the function of 1+1 telecommunication-level trunk optical fiber switching protection (with the switching time less than 50ms) Provide abundant service and device tests and achieve real-time warning and performance statistics, traffic monitoring and power down monitoring of remote ONU Support the backup configuration of double power supplies, and mixed power supply of AC 220V and DC -48V, with the entire power consumption less than 800W Networking Application OLT- GX3900 can be connected with ONU-GM2000 serial remote device (ONU) via a passive optic network (ODN) formed by optical fiber and a passive optical splitter (POS). GX3900 can be set in a central office for providing multiple users with multi-service access of broadband, traditional voice/NGN (VoIP) voice, CATV/IPTV, TDM special line, etc., on one optical fiber, so as to achieve solutions of FTTB/FTTP/FTTH, etc.