What is the Sandstone 100-02139?
The Sandstone 100-02139 is a XFP optical transceiver module, listed by the manufacturer as "Calix Compatible 10G XFP, 10GBASE-BX-D, TX1330/RX1270 nm, 20km SMF LC, DDM, I-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.