In telecommunications, foreign exchange office (FXO) designates a telephone signaling interface that generates the off-hook and on-hook indications (loop closure/non-closure) at the Foreign exchange station's (FXS) end of a telephone circuit. Analog telephone handsets, fax machines and (analogue) modems are FXO devices, though the term is rarely used except in connection with foreign exchange service (FX).
FXO interfaces are also available for computers and networking equipment, to allow these to interact directly with POTS systems. These are commonly found in devices acting as gateways between local Voice over Internet Protocol (VoIP) systems and the public switched telephone network (PSTN).
Read more about this topic: Foreign Exchange Service (telecommunications)
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