What is the Sandstone USFP-03/SS135-D-R-ST?
The Sandstone USFP-03/SS135-D-R-ST is a SFP optical transceiver module, listed by the manufacturer as "RAISECOM Compatible 100M SFP, 100BASE-BX-U, TX1310/RX1550 nm, 15km SMF LC, DDM, I-Temp, BLUE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.