Cisco DS-X2-FC10G-CX4= 10000Mbit/s network media converter

10-Gbps Fibre Channel-Copper Transceiver, X2, CX4, Spare Cisco 10-Gbps Fibre Channel X2 Transceivers
The Cisco Fibre Channel X2 transceivers are designed to provide high-performance Fibre Channel connectivity for the 10-Gbps Fibre Channel ports on the Cisco MDS 9000 family platform. There are three types of Cisco 10-Gbps Fibre Channel X2 transceivers for transmission on optical cables: Cisco Short Reach (up to 300 m; part number DS-X2-FC10G-SR), Cisco Long Reach (up to 10 km; part number DS-X2-FC10G-LR), and Cisco Extended Reach (up to 40 km; part number DS-X2-FC10G-ER). There is also a 10-Gbps Fibre Channel X2 transceiver for transmission on copper cable (up to 15 m; part number DS-X2-FC10G-CX4). Each product offers 10-Gbps Fibre Channel connectivity.