Supports four 10/100mbps ethernet ports, one 100mbps or fiber port or five 10/100mbps ethernet port gigabit speed ethernet ports are also supplied supports ieee802.3, ieee802.3u, and ieee802.3z protocols inside mac address list: can store up to 1,024 mac addresses legal maximum packet size: up to 1,916 bytes ethernet ports supports 10mbps, 100mbps, or 10/100mbps, half/full-duplex auto negotiation fiber optic port mm/sm, single/double strand, fc/sc/st physical connector selectable mm transfer distance: up to 5km/s sm transfer distance: up to 100km supports 62.5/125 and 50/125 micron multiple mode and 9/125 micron single-mode cabling mdi/mdi-x auto-crossover on the ethernet ports supports ieee802.1q tag-based vlan and port-based vlan supports ieee802.3x-based ethernet flow control supports bi-directional bandwidth management each port could be used as up-link port supports three types of management: console, web, and snmp based gui software through rs232 and rj45 ports (inside management module).