For use with the CMC-1000 chassis, these converters convert 10/100Mbps 10BASE-T/ 100BASE-TX Fast Ethernet twisted-pair signals to 100BASE-FX Fast Ethernet multi-mode fibre signals. D-Link DMC-300SC Media Converters Maximum fibre cable distance is 2km. 1 RJ-45 twisted-pair port and 1 fibre port are provided. This allows you to connect longer distance fibre cables between devices that are designed only for shorter distance cables, such as the Cat. 5 twisted-pair cable. All media converters in this system come with their own solid metal case housing, LED status indicators and AC to DC power Adaptors. They can be used as stand-alone converters, or installed in the chassis. If you install them in the chassis, you will remove their metal cases and slide in their PC boards into the chassis slots. The chassis’s power supply will be used instead of the media converters’ own AC to DC power Adaptors. All media converters are hot-swappable when used with the chassis.