What is the Dell S4148T-ON?
The Dell S4148T-ON is a QSFP optical transceiver module, listed by the manufacturer as "Dell Networking S4148T-ON 48P 10GbE 4P 100GbE QSFP28 2P 40GbE QSFP+ Switch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.