Linkbasic adaptive Ethernet optical transceiver can inter convert the electric signal of can inter convert electric signal of 100Base-TX twisted pair and optical signal of 100Base-TX. It extends the network transmission range from 100m to 100km (single mode optical fiber). Its typical application is Ethernet long range interconnection, such as the interconnection between the equipment room of community with MAN. No configuration of the switch is needed during connection due to the adaptive function. The newly added lightning protection function guarantees the safety of the equipment.