What is the Mellanox MCX516A-CCAT?
The Mellanox MCX516A-CCAT is a QSFP optical transceiver module, listed by the manufacturer as "ConnectX-5 EN Adapter Card, 100GbE, Dual-Port QSFP28, PCIe 3.0 x16 Tall Bracket". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.