FXS

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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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References in periodicals archive ?

Each FXS control includes a three-port Ethernet connection for additional FXS modules or local or remote human-machine interface (HMI) modules.

Flexible PLC control for central conveying systems

No population-based registries for FXS exist in the United States, and few children are identified by routine surveillance systems for birth defects and developmental disabilities.

Before becoming pregnant with the first child affected by FXS, 40 (29%) of 139 respondents knew that they had a family history of mental retardation, learning problems, or behavioral problems.