The RFL line of DSP based Powerline Carrier sets provide single or multiplexed voice-grade channels for the transmission of speech and/or audio tones over high voltage transmission lines. The Digital PLC terminals from RFL make it possible to transmit full-duplex digital signals up to 64kbps over high voltage power lines. These products are ideal for extending Ethernet LANs to remote locations. All of RFL's powerline carrier products are available with integrated or external high speed teleprotection system when transfer trip capability is required.