DataGen System Inc. is a company dealing with power line communication which supplies ELC (Extended Line Communication) to Korea Hydro and Nuclear Power co. Ltd. Our ELC model is suitable for places like nuclear power plant where installing a new LAN interface by connecting the ELC to a phone line, power line, and coaxial cable etc. By doing so, to a maximum 1Km and more, users can send high quality video data via using our ELC modem. Moreover, this ELC also has an application of using the Coupler. Coupler eases the task of stripping the wires to connet to ELC. The user only need to connect the Coupler on to an existing line and connect that Coupler to our ELC modem.