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The Nortel Ethernet Routing Switch 5510 models are 1 rack unit high next-generation stackable 10/100/1000 Mbps Ethernet Layer 3 routing switches designed to provide high-density Gigabit desktop connectivity to mid-size and large enterprise customers' wiring closets. Ethernet Routing Switch 5510-48T features 48 10/100/1000BASE-T RJ-45 ports for desktop switching and two built-in SFP (Small Form factor Pluggable) GBIC ports for uplink. Port 47 and Port 48 offer configuration flexibility by allowing the network administrator to configure each port as either 10/100/1000 or make use of the built-in GBIC. As many as eight models of the Ethernet Routing Switch 5510-48T can be stacked to achieve up to 384 10/100/1000 ports for high-density desktop switching.