What is the Ruckus E100G-QSFP28-ER4?
The Ruckus E100G-QSFP28-ER4 is a QSFP optical transceiver module, listed by the manufacturer as "Ruckus Compatible 100GBASE-ER4 Lite QSFP28 (LC) SMF, 30KM no FEC, 40KM w/ FEC". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.