What is the Finisar FTRJ-8519A7D-2.5?
The Finisar FTRJ-8519A7D-2.5 is a SFP optical transceiver module, listed by the manufacturer as "2GB SFP 100BASE-SX 850nm 550M MMF OPTICAL TRANSCEIVER". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.