Dell S4048T-ON Guide De Mise En Route page 24

Figure 13. Install the Fan Module
CAUTION: DO NOT mix airflow directions. All fans must use the same
airflow direction (I/O to PSU side or PSU to I/O side).
CAUTION: Check the fans at six-month intervals and replace them as
necessary. To accurately determine replacement intervals, regularly
monitor the speeds of the cooling fans.
Installing the SFP+ and QSFP+ Optics
The S4048T-ON system has 48 RJ-45 ports and six quad small form-factor
pluggable plus (QSFP+) optical ports.
For a list of supported optics, see the S4048T-ON Specification Sheet at
https://www.dell.com/support/ or contact your Dell Networking
representative.
CAUTION: ESD damage can occur if the components are mishandled.
Always wear an ESD-preventive wrist or heel ground strap when
handling the system and its components.
WARNING: 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.
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