What is the Sandstone TOM-MR-C57-LR2-ST?
The Sandstone TOM-MR-C57-LR2-ST is a SFP optical transceiver module, listed by the manufacturer as "TOM SFP MR CWDM 1571 LR2-TOM-MR-C57-LR2-RE-TOM-MR-C57-LR2". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.