The device is Ethernet IEEE802.3 media transceiver to achieve media conversion or extending network transmission distance between two kinds of media, which are 10/100Base-T UTP and 10/100Base-FX or 10/100Base-T UTP and 10/100Base-FX. It mainly used for fiber network far distance (20/40/60/80/120km) transmission, supports 10/100M or 10M, 100M transmission rate. Fiber port and UTP can work through 10M or 100M rate.