What is the Integra SFP-D57-80-48D?
The Integra SFP-D57-80-48D is a SFP optical transceiver module, listed by the manufacturer as "SFP, DWDM 1531.90nm, ZX/LR-2 SMF 80km". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.