These stand-alone 18-port managed switches provide two combo GigaBit ports for GigaBit optic communication. The GigaBit Ethernet Redundant Turbo Ring (recovery time <300 msec) increases reliability and speed of the network. This Series supports intelligent network management functions including QoS, IGMP Snooping/GMRP, VLAN, Port Trunking, SNMP V1/V2c/V3, IEEE 802.1X, and https/SSL. Also supported are IEEE802.1D-1998 DMRP and IGMP Snooping to reduce the traffic on the Ethernet LAN.