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Cisco Nexus 3000 Series Hardware Installation Guide
OL-25338-04
Chapter 1 Overview of the Cisco Nexus 3000 Series Switches
Cisco Nexus 3548 and Cisco Nexus 3524 Switches
Both forward (port-side exhaust) and reversed (port-side intake) airflow schemes are supported. The
port-side exhaust scheme is used when the cold air flows in through the side having the fans (facing the
cold aisle) and exhausts out of the side having the ports (facing the hot aisle). Port-side intake scheme
is used when the air flows in through the ports (facing the cold aisle) and leaves through the side having
the fans (facing the hot aisle).
Figure 1-13 shows the Cisco Nexus 3548 with blue handles indicating
forward airflow
Figure 1-13 Cisco Nexus 3548 with blue handles indicating forward airflow
Figure 1-14 shows the Cisco Nexus 3548 with red handles indicating reversed airflow
Figure 1-14 Cisco Nexus 3548 with red handles indicating reversed airflow
Caution You can order a replacement fan tray with forward airflow or reverse airflow. Be sure to order the same
direction of airflow that is used with the switch.
Caution The switch must run with all of its power supply and fan tray modules taking in air from a cold aisle and
exhausting air to the hot aisle. If they take in air from a hot aisle, an overtemperature condition can occur
and the switch will shut down. If the airflow directions are mixed in the same switch, you will see an
error.
Port Connections for the Cisco Nexus 3548 Switch
The Cisco Nexus 3548 supports a wide variety of 1 and 10 Gigabit Ethernet connectivity options. For
in-rack or adjacent-rack cabling, the Cisco Nexus 3548 supports SFP+ direct-attach 10 Gigabit Ethernet
copper, an innovative solution that integrates transceivers with Twinax cables into an energy-efficient
and low-cost solution. For longer cable runs, multimode and single-mode optical SFP+ transceivers are
supported.
Table 1-20 describes the 10 Gigabit Ethernet transceivers you can use.