Cisco's Catalyst 6000 Family Fast Ethernet switching modules offer a number of advanced features that make it easier to migrate to or implement a Fast Ethernet network. The 10/100 Fast Ethernet switching modules, for example, support autosensing/autonegotiation to determine the speed and duplex mode of the attached device. Fast Ethernet switch module customers have the flexibility to select modules with RJ-45, RJ-21, or fiber MT-RJ interfaces. Customers can use category 3 through category 5 UTP cable or STP cable or multimode fiber (62.5/125 micron). All Fast Ethernet switching modules are hot swappable without interruption of the Catalyst 6000 Family switch.Catalyst 6000 Family Fast Ethernet modules fully support Cisco Fast EtherChannel technology, which gives network managers with a reliable high-speed solution for the campus network backbone. Fast EtherChannel provides flexible, incremental bandwidth aggregation in multiple 200 Mbps increments, up to 1.6 Gbps per Fast EtherChannel link. Customers can take advantage of the new multimodule channeling feature that combines ports from the same module or from different modules into a Fast EtherChannel link. This is ideal for customers requiring scalable, flexible bandwidth within the network. Customers also benefit from Fast EtherChannel automatic recovery and redistribution of loads across remaining links, ease of management, and technology that is transparent to network applications. The Catalyst 6000 Family offers advanced network management features to make it easy to manage fast-growing networks. Each module has extensive interface-level statistics including four remote monitoring (RMON) groups, alarms, events, history, and statistics. For in-depth network analysis, users can employ the Enhanced Switched Port Analyzer (Enhanced SPAN) feature to redirect traffic from each switched port to a specific virtual LAN (VLAN), allowing the user to add, move, and easily change group access to network resources from centralized locations using CiscoWorks.This is a 24-port 100FX Fast Ethernet Module for the Catalyst 6000 Family Switches, multimode fiber, MT-RJ.