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Remote Control For Jvc Rm-sfsx5r Fs-x3 Fs-x5 Ca-fsx1 Sp-fsx1 Ca-fsx3 Sp-fsx3 Ca-fsx5 Powered Woofer Cd Portable Stereo System - Remote Control - AliExpress
What are FXS and FXO ports? What are they used for? - VoIP Insider