online dictionaries of abbreviations

A C D E F G H I M N O P R S T U V W X
FO FT FX

FXO

Foreign Exchange Office
A telephone interface that receives POTS, or Plain old telephone service. It generates the on-hook and off-hook indicators used to signal a loop closure at the FXO's end of the circuit. A standard analog telephone is such a device. The FXO must be connected to the Foreign exchange station interface, or FXS interface.
See also: FXS

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