FXS/FXO Gateway

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FXS Gateway

FXS – Foreign exchange Subscriber interface is the port that actually delivers the analog line to the subscriber. In other words it is the “plug on the wall” that delivers a dial tone, battery current and ring voltage.

FXO Gateway

FXO – Foreign exchange Office interface is the port that receives the analog line. It is the plug on the phone or fax machine, or the plug(s) on your analog phone system. It delivers an on-hook/off-hook indication (loop closure). Since the FXO port is attached to a device, such as a fax or phone, the device is often called the “FXO device”.:

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