The TBC-MC3412E-D20 fiber switch can convert 2 independent 10/100Base-TX twisted pair electrical signals and 1 independent 100Base-FX optical signal to each other.It extends the transmission distance of the network from the 100m limit of copper wire to 120km.Through the use of switching technology , storage and forwarding technology to achieve data of the two networks before connecting the media , greatly improving the flexibility of fiber Ethernet set, and reducing the cost of network construction, support dual-fiber multi-mode, dual-fiber single-mode , Single-mode single fiber and other optical fiber transmission.