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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 3048 Switch
Fan Tray for the Cisco Nexus 3048 Switch
The Cisco Nexus 3048 switch ships with one fan tray, which provides forward airflow from the fan tray
to the port connector end exhaust (spares part number N3K-C3048-FAN=) or reverse airflow from the
port connectors end of the chassis to the fan tray for exhaust (spares part number N3K-C3048-FAN-B).
You can hot swap the fan tray during operations but must replace it within two minutes or the switch can
reach an overtemperature condition and shut down.
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. If there is a black stripe across the front of the fan trays
and power supplies, the switch is running reverse airflow and you must order a fan tray with reverse
airflow. If there is no black stripe across the front of these modules, the switch has forward airflow and
you must order replacement modules with forward airflow.
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 3048 Switch
You use RJ-45 connectors with copper cables for the downlink ports, management ports, and console
port, and you use SFP or SFP+ transceivers for the uplink ports.
The 4 uplink ports support SFP and SFP+ transceivers that are either connected to copper cables or can
be connected to optical cables.
Table 1-6 describes the SFP+ transceivers and cable connections that you
can use. Table 1-7 describes the SFP transceivers and cable connections that you can use.
Ta b l e 1-6 SFP Transceivers and Cables for the Cisco Nexus 3048 Switch Uplink Ports
Part Number Transceivers and Cables
GLC-T 1000BASE-T SFP transceiver
GLC-SX-MM Gigabit Ethernet multimode fiber (MMF) SFP transceiver with an LC connector of
type SX
GLC-LH-SM Gigabit Ethernet single-mode fiber (SMF) SFP transceiver with an LC connector of
type LX/LH