What is the Dell S4112F-ON?
The Dell S4112F-ON is a QSFP optical transceiver module, listed by the manufacturer as "S4112F, 12x 10GbE SFP+, 3x 100GbE QSFP28, 2x AC Fixed PSU, 3x Fixed Fan DUAL AC , + OS10 + Dell Networking Rack Rail Dual Tray one Rack Unit 4-post rack". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.