Setup Guide

Ground cable
Dell EMC recommends grounding your switch. To attach the ground cable to the chassis, use a single M4x0.7 screw.
The cable itself is not included with the S4048–ON. To properly ground the chassis, Dell EMC recommends using a 6 AWG
one-hole lug, #10 hole size, 63" spacing, not included in shipping. The one-hole lug must be a UL recognized, crimp-type lug.
CAUTION: Grounding conductors must be made of copper. Do not use aluminum conductors.
NOTE: The rack installation “ears” are not suitable for grounding.
NOTE: Coat the one-hole lug with an anti-oxidant compound prior to before crimping. Also, bring any unplated mating
surfaces to a shiny finish and coat with an anti-oxidant prior to mating. Plated mating surfaces must be clean and free from
contamination.
To connect the ground cable to the switch, follow these steps.
1. Cut the ground cable to the desired length. The cable length must facilitate proper operation of the fault interrupt circuits.
Dell EMC recommends using the shortest cable route allowable.
2. Take the one M4x0.7 screw from the package.
3. Attach the one-hole lug to the chassis using the supplied 10-32 screw with the captive internal tooth lock washer. Torque
the screw to 20 in-lbs.
4. Attach the other end of the ground cable to a suitable ground point. The rack installation ears are not a suitable grounding
point.
SFP+ and QSFP+ optic installation
The S4048–ON has six quad small form-factor pluggable plus (QSFP+) optical ports.
For a list of supported optics, refer to the S4048–ON data sheet at www.dell.com/support or contact your Dell EMC sales
representative.
CAUTION:
ESD damage can occur if the components are mishandled. Always wear an ESD-preventive wrist or
heel ground strap when handling the S4048–ON and its components.
NOTE: When working with optical fibers, follow all the warning labels and always wear eye protection. Never look directly
into the end of a terminated or unterminated fiber or connector as it may cause eye damage.
1. Position the optic so it is in the correct position. The optic has a key that prevents it from being inserted incorrectly.
2. Insert the optic into the port until it gently snaps into place.
NOTE: Both rows of QSFP+ ports require that you install the 40GbE optics with the tabs facing up.
NOTE: When you cable the ports, be sure not to interfere with the airflow from the small vent holes above and below
the ports.
QSFP+ optic replacement
Remove an optic by pushing the tab on the optic and sliding the optic from the port.
When removing optics with direct attach cables (DACs) from the port, pull the release tab firmly and steadily. Before pulling the
release tab, you may need to gently push the optic into the port to ensure it is seated properly. Do not jerk or tug repeatedly on
the tab.
Split QSFP+ ports to SFP+ ports
The S4048–ON supports splitting a single 40G QSFP+ port into four 10G ports using one of the supported breakout cables.
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S4048–ON installation