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www.consentry.com/download/ConSentry_App_Brief_LAN_Seg.pdf

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Posted by crouse

FXS - Foreign eXchange Subscriber interface (the plug on the wall) delivers POTS service from
the local phone company’s Central Office (CO) and must be connected to subscriber equipment
(telephones, modems, and fax machines). In other words an FXS interface points to the
subscriber. An FXS interface provides the following primary services to a subscriber device:
l Dial Tone
l Battery Current

FXO - Foreign eXchange Office interface (the plug on the phone) receives POTS service,
typically from a Central Office of the Public Switched Telephone Network (PSTN). In other words
an FXO interface points to the Telco office.

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Posted by sagitraz

The difference between an FXO channel and an FXS channel is simply which end of the connection provides the dial tone. An FXO port does not generate a dial tone; it accepts one. A common example is the dial tone provided by your phone company. An FXS port provides both the dial tone and ringing voltage to alert the station user of an inbound call. Both interfaces provide bidirectional communication (i.e., communication that is transmitted and received in both directions simultaneously.

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Posted by james_winston