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A Foreign Exchange Station, or FXS, is a telephone interface which provides battery power, sends dial tone, and generates ringing voltage. A standard telephone plugs into such an interface to receive telephone service. A telephone exchange is an example of an FXS.
In a nutshell
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 ring signals and dialtone, understand when phone goes on-hook or off-hook, and send and receive voice signals.
See also
- Foreign exchange office (FXO)
External links
"Foreign exchange station"