What is the Sandstone JNP-QSFP-ER4L-ST?
The Sandstone JNP-QSFP-ER4L-ST is a QSFP optical transceiver module, listed by the manufacturer as "compatible 100G QSFP28 ER4 Lite Optical Transceiver Module". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.