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)
Famous quotes containing the words foreign, exchange and/or office:
“The condition every art requires is, not so much freedom from restriction, as freedom from adulteration and from the intrusion of foreign matter.”
—Willa Cather (1876–1947)
“I live in my house as I live inside my skin: I know more beautiful, more ample, more sturdy and more picturesque skins: but it would seem to me unnatural to exchange them for mine.”
—Primo Levi (1919–1987)
“We need not fear excessive influence. A more generous trust is permitted. Serve the great. Stick at no humiliation. Grudge no office thou canst render. Be the limb of their body, the breath of their mouth. Compromise thy egotism.”
—Ralph Waldo Emerson (1803–1882)