IPNext 190 System Installation GuideAddPac Technology Proprietary & Documentation 132 - 32Connecting Analog Voice Interface (option)Use RJ-11 stadard cable to connect FXS port with subscriber voice devices. FXS port is the interface with RJ-11connector for connecting the basic phone device such as Keyphone, PBX and FAX.FXO port connects the external PSTN with RJ-11 standard cable. FXO port is the interface with RJ-11 connector forconnecting the standard Public Automatic Branch Exchange (PABX).RJ11 to PSTNCable PSTNRJ11 to RJ11CableAnalog PhoneFigure 2-3 Connecting PSTN Interface
