The internal design of this unit is based on 50Ohm. To fit the sat-nms LFTX/RX optical links to a 75Ohm system, internal 50/75Ohm converters with 75Ohm F-type connectors are available. Due to its low loss design, this option causes approx. 1dB attenuation and approx. 1dB negative slope over the hole L-Band. the internal DC bypass ensures the function of LNB power supply by an optical transmitter card.