Mulogic LLM336.Eth Rack Card Voiceband Ethernet Modem 24V-48Vdc internal power supply (18V-60Vdc) or (100-240Vac with power adapter sold sepreratly). This Ethernet Modem is for Conditioned Leased Lines(Analog) or Copper Lines used to bridge Ethernet data (Layer 2) over a communications line(2 wire or 4 wire operation). Can also be used on unconditioned copper or other metallic wires and even over voice channels of radio systems. The distance between two voiceband modems is virtually without limits as long as the attenuation and noise on the voice channel remains acceptable. Ethernet port supports 10/100baseT,Auto-MDI/MDIX. Supports SCADA protocols like Modbus/TCP,DNP3/IP and IEC60870-5-104. Under controlled circumstances the LLM-336.Eth can even operate on multipoint networks. Operating temperature of -13 F to 158 F. No configuration,very easy set-up,plug and play.