Media Converters DMC-F20SC-BXD and DMC-F20SC-BXU perform conversion of interfaces “twisted pair – a single-mode fiber optic cable over a single fiber” for the Ethernet 10 / 100BASE-TX and 100BASE-FX network. The devices can simultaneously transmit and receive signals at wavelengths between 1310 nm and 1550 nm over a single optical fiber for distances up to 20 km. Media Converters DMC-F20SC-BXD and DMC-F20SC-BXU have 1 RJ-45 twisted pair port and 1 port for an optical cable (SC-connector). In the twisted pair port supports auto speed, mode (full-duplex or half-duplex), polarity MDI / MDI-X, which simplifies installation in existing network media converter. Converter supports the function of LLR (Link Loss Return) for the optical port.