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, see the S4048–ON data sheet at https://www.dell.com/support or contact your Dell sales
representative.
CAUTION: If the components are mishandled, ESD damage can occur. 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 must 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.
Switch power-up
Supply power to the S4048–ON after it is mounted in a rack or cabinet.
Dell Technologies recommends reinspecting your switch before powering up. Verify the following:
● The equipment is properly secured to the rack and properly grounded, optional.
● The equipment rack is properly mounted and grounded, optional.
● The ambient temperature around the unit—which may be higher than the room temperature, is within the limits that are
specified for the S4048–ON. For more information, see Specifications.
● There is sufficient airflow around the unit.
● The input circuits are correctly sized for the loads and that you use sufficient overcurrent protection devices.
● All protective covers are in place.
● Blank panels are installed if you do not install optional modules.
NOTE:
A US AC power cable is included for powering up an AC power supply. You must order all other power cables
separately.
NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap
when handling the S4048–ON switch and its components.
Power up sequence
When the switch powers up, the fans immediately come on at high speed. The fan speed slows as the switch continues to boot.
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S4048–ON installation
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