The TBC-MC3424E-S20 Series 10/100M Adaptive Switched or Isolated Ethernet Fiber Transceiver, which integrates the functions of a single transceiver and a simple switch to convert a standalone 10/100Base-TX twisted pair electrical signal and an independent 100Base-FX optical signal conversion. It extends the network's reach from 100m copper limit to 120km (single-mode full duplex) and supports two different types of network connection media: 10/100Base-TX and 100Base-FX, through the use of switching technologies and storage forwarding Technology to realize the data transmission between two kinds of network connection media, which greatly improves the flexibility of establishing the Ethernet optical network and reduces the network construction cost, and supports dual-fiber multi-mode, dual-fiber single mode and single fiber single Mode and other optical fiber transmission.