Model:EW-610SM-20A/B 100M Media Converter , Media Converter 100M Single Fiber Media Converter Supports Auto MDI/MDIX for TX port Model:EW-610SM-20 100M Media Converter , Media Converter 10/100M Single mode Dual Fiber Media Converter (1*Fiber+1*RJ45) Model:EW-610MM-2 100M Media Converter , Media Converter 10/100M Multi mode Dual Fiber Media Converter (1*Fiber+1*RJ45) 100M Media Converter , Media Converter 10/100M Single mode Single Fiber Media Converter (1*Fiber+1*RJ45)