Optical fiber transceiver is an Ethernet transmission media conversion unit that interchanges short-distance twisted-pair electrical signals and long-distance optical signals. It is also called a fiber converter in many places. The product is generally used in the actual network environment where the Ethernet cable cannot be covered and the transmission distance must be extended by using optical fiber, and is usually located in the access layer application of the broadband metropolitan area network; such as: high-definition video image transmission for monitoring and security engineering; Helping to connect the last mile of fiber to the metro.