Foreign Exchange Office. The FXO interface connects to the central office of a Public Switched Telephone Network (PSTN). It is the interface offered on standard analog phones. The Odin Arni-16-PCI board is equipped with 16 FXO interfaces.
Foreign Exchange Office. A device that connects with a Central Office (CO) or PSTN analog line.
foreign exchange office. An FXO interface connects to the PSTN's central office and is the interface offered on a standard telephone. The Cisco FXO interface is an RJ-11 connector that allows an analog connection to be directed at the PSTN central office. This interface is of value for off-premises extension applications.