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Cable specification: 
◼  Cable: Standard straight-through RJ-11 telephony cable 
◼  Connector: RJ-11 
◼  Connector Pinouts: 
Figure 12: RJ-11 Connector Pinouts for FXS Interfaces 
 
To connect an FXS interface: 
1.  Connect one end of an RJ-11 cable to an FXS port, located on the rear panel and labeled FXS. 
Figure 13: Cabling FXS Interfaces 
 
2.  Connect the other end of the cable to the required telephone interface (e.g., fax machine, 
dial-up modem, or analog POTS telephone).