Cisco provides a wide range of Fast Ethernet switching modules that share capability for any Fast Ethernet interface to support up to 1000 VLANs between Catalyst 5000 family switches and Cisco routers. They also support any combination of switching modules; modules can be hot-swapped or added without resetting the Catalyst 5000 family. Simply Cisco suggests super flexibility and compatibility. With the help of Cisco's Fast Ethernet switching modules you can easiely build your own network according to your needs.The Fast Ethernet switching module (100BaseFX 24 port) provides 24 switched, 100-Mbps (100BaseFX), full- or half-duplex Fast Ethernet ports. The ports have the MT-RJ connectors for the MMF cable.