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The Cisco Catalyst 4948 Switch is a wire-speed, low-latency, 1 RU fixed-configuration switch for rack-optimized server switching. Based on the proven Cisco Catalyst 4500 Series hardware and software architecture. The Cisco Catalyst 4948 offers exceptional performance and reliability for low-density, multilayer aggregation of high-performance servers and workstations. The Cisco Catalyst 4948 offers 48 ports of wire-speed Layer 2-4 10/100/1000-BASE-T with four alternative wired ports that can accommodate optional 1000-BASE-X Small Form-Factor Pluggable (SFP) optics Exceptional reliability and serviceability is delivered with optional internal AC or DC 1+1 hot-swappable power supplies and a hot-swappable fan tray with redundant fans. The Cisco Catalyst 4948 has 52 physical switching ports (48 10/100/1000 and four SFP) on the front panel. Up to 48 of these ports can be active at one time in any combination.