Description The Catalyst 2820 series Ethernet switches provide 25 10-Mbps switched Ethernet connections: 24 10-Mbps connections to 10BaseT-compatible devices (such as single workstations and 10BaseT hubs) and one 10-Mbps connection to an AUI. Switches with the optional Catalyst 2820 modules installed can provide 100BaseT, FDDI, and ATM connectivity to servers and backbones. The Catalyst 2820 switches provide half- or full-duplex operation on switched ports: 24 fixed 10BaseT switch ports and Catalyst 2820 100BaseTX and 100BaseFX switch module ports. They allow back pressure-based congestion control on half-duplex, 10-Mbps Ethernet ports (standard IEEE 802.3 Layer 2 backoff algorithms). They allow the ports support to belong to up to four separate bridge groups within the switch. Switches running standard software are designated by the letter A, and switches running Enterprise Edition Software are designated by the letters EN.
