The Catalyst 2900 XL switches feature Cisco Switch Clustering technology. This breakthrough technology enables up to 16 interconnected Catalyst 2900 XL, 3500 XL, and 1900 switches, regardless of physical proximity, to form a single-IP managed network. Cisco Switch Clustering technology expands the traditional stacking domain beyond a single wiring closet and lets users "mix and match" interconnections to meet specific management, performance, and cost requirements. The Catalyst 2900 series XL modules can add port density and fiber-optic connectivity to a Catalyst 2900 series network. When installed in a Catalyst 2912MF XL, Catalyst 2916M XL, or Catalyst 2924M XL switch, these modules support switched 10BaseT, 100BaseTX, 100BaseFX, or 1000BaseX connections. The 10BaseT/100BaseTX module autonegotiates the duplex and speed settings of each port to match that of the attached device. The 1000BaseX module autonegotiates the duplex mode only.Catalyst 2900 XL switches can be configured either as command (with a command software upgrade) or member switches in a Cisco switch stack or cluster. The command switch serves as the single IP address management point and disburses all management instructions dictated by the network administrator.This pack contains two Catalyst 2924 XLs and one Catalyst 2916M XL.