t is different. The 5548 is capable of forty-eight 10 Gbps ports with a throughput of 960 Gbps, which equates to wire speed on all forty-eight 10 Gbps interfaces. The Nexus 5000 family is shown in Figure 18-3. Figure 18-3. Nexus 5500, 5010 and 5020; courtesy of Cisco Systems, Inc.; unauthorized use permitted Though they all have dual power supplies, the 5010 and 5020 switches have the power connectors on the same side as the data ports. The hot-swappable portion of the power supply is found (and removed) from the opposite end of the switch. These switches are designed with front-to-back airflow, but many people are surprised that in a properly designed hot-/cold-aisle data center, it seems that these switches need to be installed backward. What I mean by this is that the end of the switches with the ports is actually the back of the switch. Remember, these switches are designed to mounted on the top of server racks, SO the ports would be on the same end as the server Chapter 18: Cisco Nexus ports. When mounting switches in racks by themselves (center-of-row methodology), many people seem to want to mount them the other way around. Another thing to watch out for with these switches is that they need to extend a few inches beyond the rails on the back, which means they will extend beyond any air barriers you may have on the backs of the racks. The reason for this is, again, airflow. The backs of the 5010s are slightly slanted on top. This slant contains the air vents necessary for air to escape the chassis, as shown in Figure 18-4. The device shown is actually a 2148 FEX, but the 5010s are built the same way. 700-27917 01 REV. FOXCONN 12/07/2009 Figure 18-4. A 2148 FEX as seen from the side; notice the airflow vent on top When you've installed the switches, be careful not to stuff cables into the space between them, as this will impede proper airflow and cooling. This is not a concern with the 5020 since it has more space on the back panel for air vents. Though the Nexus 5000s were designed to be data-center switch