The Cisco Catalyst 4500 Series offers a variety of GBIC- or SFP-enabled gigabit solutions for high-performance Gigabit Ethernet uplinks and server farm connectivity. The five GBIC- or SFP-enabled gigabit line card options for the Cisco Catalyst 4500 Series include 2-, 6-, 18-, and 48-port versions. GBIC or SFP technology allows customers to intermix intra-building MMF connections and long-distance single-mode connections simply by changing the GBIC or SFP type.