CLT-10/100/1000S-SC ethernet optical fiber transceiver series transforms the electrical signal which transmits in the twisted pair line originally into the light signal which transmits on the optical fiber, has extended ethernet's connection distance. CLT series gigabit optical fiber transceiver Optical Interface conforms to IEEE802.3z, electricity Interface conforms to the IEEE802.3ab standard, it can fully meet the needs of the user's long-distance transmission.