... /100M TX and 4 ports 1000M SFP/TX Combo; Support PoE; Advanced architecture SpecificationsS3424PoES3448BPoEProcessorMPC 266MHzFLASH8 MBMemory128 MB (up to 512 MB ... InputAC 100 ~ 240 V, 47 ~ 63 Hz, 1A/230V,Supporting PoE outputLED IndicatorsPower, system, link, activity, 10/100MTemperatureOperating: 0 ~ 50°C ... , single-mode, 80 km, 1550 nm Hi-performance Gigabit Ethernet POE Switch