The Cisco Catalyst 4948E and 4948E-F are wire-speed, low-latency, Layer 2-4, 1 rack unit (1 RU), fixed-configuration switches for rack-optimized server switching.

Based on the award-wining Cisco Catalyst 4948 hardware and software architecture, the Cisco Catalyst 4948E and 4948E-F double uplink capacity to four 10Gb Ethernet uplinks and supports IPv6 in hardware. In addition Cisco Catalyst 4948E and 4948E-F offer front-to-back and back-to-front cooling respectively for deployment flexibility.