What is the FCM QSFP-4SFP10G-CU1M?
The FCM QSFP-4SFP10G-CU1M is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 40GBASE-CR4 QSFP". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.