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Foreign Exchange Station (FXS) and Foreign Exchange Office (FXO) cards for service
using regular phone lines, just as you do in your home. These lines come from your carrier and terminate in a small jack on the wall that are plugged into one phone. FXS interfaces connect directly to a handheld telephone or a dialer. The FXS cards provide the dial tone, caller ID, and ring voltage to the phone so that you understand that your call is being processed.
The FXO cards connect to the phone lines from your local carrier and transmit your call to the carrier for processing. These cards detect dial
tone and ringing from the far end so that your FXS card can then forward
this information to you.The Digium analog cards allow you to either use four individual phone lines through standard RJ-11 jacks (the same jacks your home phone connects to)
or an interface where you can use up to 24 phone lines through a specialized
plug called an amphenol connector that separates every channel into 24 pairs
of wires.
Analog cards from Digium are modular and can support FXO and FXS ports in
any configuration. Your four-port card can have one, two, or three FXO cards
with one, two, or three FXS ports. It’s great to have options!
Posted by sagitraz
1. You need one FXO interface port for every analog phone line you want to have access to from your Asterisk server.
2. FXO modules are configured with Foreign Exchange Station (FXS) signaling
3. Connection to the local carrier office requires an FXO module.
4. In the case of FXO modules, the server is acting as an
end station, receiving dial tone and ringing; hence it's configured with FXS signaling.
5. FXS module is connected to an analog phone (station) but functions to generate ringing and dial tone so it acts like a local carrier office
and it's configured with FXO signaling.
Posted by james_winston
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