ONU GM2004 is a pure broadband mini ONU of GM2000 series of EPON products. As a terminal access device of an access network, it can interconnect with GX3000 serial OLT via an optical splitter (ODN) and optical fiber to form a passive optical network access system, and can also manage all ONU terminals via OLT. ONU GM2004 is mainly applied to pure broadband. It provides 4 FE interfaces, has compact structure and compact shape, and also has the function of exchanging double built-in layers. GM2004 is suitable for being applied to FTTH/FTTP access ways for access of residential users, enterprises, etc. Product Features Achieve IEEE802.3ah standard Provide 4 FE Ethernet interfaces of RJ45 interface type and support self-adaptation of five kinds of straight and crossed network cables Support IEEE 802.1Q VLAN function, with an uplink and downlink symmetric transmission rate of 1.25G Support bidirectional bandwidth control, efficient multicast service and controllable multicast service (support IGMP snooping) Support abundant OAM functions, and ONU automatic discovery and recognition function (plug and play) Support abundant test and warning functions and achieve warning, performance statistics and traffic monitoring Control based on service bandwidth and support dynamic bandwidth allocation (DBA) Support ONU remote diagnosis and quick positioning of fault reasons.