The 16-port 10 Gigabit Ethernet module provides up to 130 10 Gigabit Ethernet ports in a single Cisco Catalyst 6500 chassis and 260 10 Gigabit Ethernet ports in a virtual switching system (VSS) and is targeted for LAN campus aggregation and data center access, where fan-out and port density are very important. It consists of 4 port groups of 4 ports each. Users can operate each port group in either oversubscription mode (2 to 4 ports used per port group) or performance mode (1 port used per port group), allowing maximum flexibility for using some ports for connection to servers in performance mode and some other uplinks to wiring closets in oversubscription mode.