HGU ONU, the bridging and routing mode can be set Modular dual ONU for popular EPON and GPON OLT Support loop detection, IGMP, and IGMP snooping 802.1Q VLAN, QinQ, CoS, DSCP, QoS service priority Support port, support port Support Telnet, CLI, OMCI/OAM and Web management Support NAT, firewall function Support remote software upgrade