What is the Sandstone XFP-10G-ER-ST?
The Sandstone XFP-10G-ER-ST is a XFP optical transceiver module, listed by the manufacturer as "Cisco ASR Compatible 10G XFP, 10GBASE-ER, 1550 nm, 40km SMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.