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Voice-over-Internet Protocol (VoIP) Smart Node solutions .Foreign exchange Subscriber (FXS) and Foreign exchange Office (FXO).

Detailed Description The question whatis the difference betweenFXS and FXO? is frequently asked by those deploying Patton Voice-over-InternetProtocol (VoIP) Smart Node solutions. Foreign exchange Subscriber (FXS) andForeign exchange Office (FXO) are the names of the two most common interfaces(ports orplugs) found in analog telephony environments. Analog telephony, alsoknown as Plain Old Telephone Service (POTS), is the service the local phonecompany typically delivers to your home. Local phone companies deliver POTSfrom their Central Office (CO) tothe subscriber'spremises over a circuitconsisting of two copper wires. To increase the distance over which the signalcan be transmitted the two wires are twisted together, which also reduces electromagnetic interference. So these two-wire copper cablesare commonlyknown as twisted pairs.


FXS -Foreign exchange Subscriber interface (the plug on the wall) delivers POTS service from the local phone companiesCentral Office (CO) and must be connected to subscriber equipment (telephones,modems,and fax machines). In other words an FXS interface points to thesubscriber. An FXS interface provides the following primary services to asubscriber device.

Dial Tone, Battery Current, Ring Voltage

FXO -Foreign exchange Office interface (theplug on the phone) receives POTS service, typically from a Central Office ofthe Public Switched Telephone Network (PSTN). In other words an FXO interfacepoints to the Telco office. An FXO interface provides the following primaryservice to the Telco network device.

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