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FXS(Foreign eXchange Station) The analog interface provided by a telephone company (PSTN) to its customers, which includes dial tone, power and ring voltage. The telephone jack on the wall is a foreign exchange station (FXS) interface. See foreign exchange service.
FXS and FXO
The plug on an analog telephone is a foreign exchange office (FXO) interface, which provides on-hook/off-hook loop closure to the telephone company. Thus, an FXO phone plugs into an FXS jack. A PBX's FXO interface is connected to the FXS interface, and all analog phones (FXO) connect to the FXS interface on the PBX.
|An Analog Telephone Adataper (ATA)|
|For VoIP service, this HT813 analog telephone adapter connects an analog telephone to a router (LAN) or the Internet (WAN). For backup, it includes an FXO port that connects to a traditional PBX or telephone company. See central office and SIP. (Image courtesy of Grandstream Networks, Inc., www.grandstream.com)|
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