Singlemode Fiber to Ethernet Converter The Fast Fiber Converter FIB-10/100M/ST and FIB-10/100M/SC provides you with ST and SC connector for your fiber optic cable and RJ-45 ports (straight through and crossover) for your 10/100 Base-TX twisted pair cable connection. Ultilizing singlemode optical cable, the cabling distance of your 100Base-TXnetwork may be extended to 15, 30 or 50kilometers. When auto-negeotiation is selected, these units will automatically tailor themselves to convert both half-duplex and full duplex signals, depending on your specific network needs. You may also set the unit to convert signalsin full-duplex or half duplex only.Five LED indicators signal the power status of the converter, RJ-45 port and FX port activity, and full or half duplex status.