What is the Sandstone USFP-GB/SS13-D-R-ST?
The Sandstone USFP-GB/SS13-D-R-ST is a SFP optical transceiver module, listed by the manufacturer as "1.25G, 15km, single strand SFP, TX 1310nm RX 1550n-RE-USFP-GB/SS13-D-R". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.