What is the Sandstone QSFP-100G-B20U4-I-ST?
The Sandstone QSFP-100G-B20U4-I-ST is a QSFP optical transceiver module, listed by the manufacturer as "100GBASE QSFP Transceiver BD 20km upstream LC Simplex SMF.". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.