CTCUnion POTS (RJ11) phone line over fiber converter, multimode SC, 2Km, FXO/FXS mode, FRM220-FXO-FXS-SC002 POTS Line: FXO (Impedance:600ohms, REN:0.4), FXS (Feedback Voltage: 48VDC, Ring: 90Vp-p), Interfaces: RJ11 port 600Ohms and dual SC 155M fiber port Operating wavelength: 1310nm multimode, Operating distance: 2Km on 62.5/125um fiber, works also on 50/125um fiber, Optical connector: SC dual type Front LEDs: Power, Fiber Link, Di/Do, Test mode Power: External 90-260V AC switching adapter 12VDC@1A with NEMA1-15(2 blades only), US type main plug - included in the box Temperature: 0  50C (Operating); 0  70C (Storage)~Humidity: 20  80% non condensing (Operating); 0  90% (Storage)~Consumption: less than 5W~Dimensions(WxDxH): 88mm x 155mm x 23mm~Weight: 330g (without AC adapter)~Compliance: CE, FCC Class A~MTBF: 65,000 hours