online dictionaries of abbreviations

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FO FT FX
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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 More…
FXS
(Foreign Exchange Station) A telephone interface which provides battery power, sends dialtone, and generates ringing voltage. A standard telephone plugs into such an interface to receive More…
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