<P>The SuperStack II Switch 3900 delivers full line-rate performance (over 9.8 million pps of switching performance) for up to 36 10/100 Mbps ports and from one to three 1000 Mbps ports. Multiple Gigabit Ethernet uplinks can be trunked together to deliver an uplink with 3 Gbps of bandwidth. The SuperStack II Switch 3900 is available in two versions: a 24- and 36-port 10/100 Ethernet/Fast Ethernet switch. Both have one integral 1000BASE-SX port and two Gigabit Ethernet expansion slots. The rear-mounted expansion slots accept optional Gigabit Ethernet modules available for either 1000BASE-SX or 1000BASE-LX both via SC connectors. The 1000BASE-SX option supports multimode fiber links, while the 1000BASE-LX option supports single-mode fiber. The 1000BASE-LX option supports multimode fiber when used in conjunction with a conditioned launch cable. </P>