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In telephony, a Foreign Exchange Station, or FXS, is a telephone interface which provides battery power, sends dialtone, and generates ringing voltage. A standard telephone plugs into such an interface to receive telephone service. Strictly speaking, a telephone exchange is an example of an FXS, as is the telephone plug on the wall, though the term is rarely applied except in connection with foreign exchange service.
In a nutshell
An FXS is any device that, from the point of view of a telephone, seems to be a telephone exchange. As such, it should be able to supply power to the connected telephone, provide ringing signals and dialtone, understand when phone goes on-hook or off-hook, and send and receive voice signals. It was invented and named for service at the "station" end of a foreign exchange line.
See also
- Foreign exchange office (FXO)
- Foreign exchange service (FXS)
- Telephone line
- Telephone signaling interfaces
