This Optical Fiber Converter is a kind of quick Ethernet Media Converter with the function of photo electricity switchover between 10base-TX or 100base-TX and 100base-FX. It can extend the conventional 10M Ethernet or 100M Quick Ethernet to 120KM via the quick Ethernet Fiber-optical Line. The stable and reliable switch power supply module enables long-term operation and makes it convenient to replace the power supply. Full-duplex and half-duplex optional. The configuration of DTE and MPR functions makes it convenient to connect the similar products.