D-Link DEM-423XT 10000Mbit/s 1550nm network media converter

10GbBase-ER, XFP, LC, 15 dBm 10GBASE-ER single-mode XFP Fibre Transceiver

The transceivers provide the necessary signal amplification for data to be transmitted to the network cable from the port, and vice versa, for the port to receive data from the network cable.
Applications of these transceivers include distributed multi-processing, Switch cascading, high-speed I/O file transfer, bus extension application, and channel extender/data storage.
All transceivers are hot swappable. You can remove or replace the transceiver with the system powered on. This permits modules and transceivers to be added or swapped without interrupting amplification for data to be transmitted to the network the network operation.
DEM-423XT is 10G XFP transceiver which plugged in optional 10G module.