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Quad FXS FXO module cards


Name: Quad FXS FXO module cards

Model: S400M, X400M



Quad FXS FXO module cards

The quad FXS FXO module cards S400M X400M are for Digium TDM800P/AEX800/TDM2400P cards. Fully compatible with them. It allows to TDM800P/AEX800/TDM2400P to terminate four analog telephone lines (POTS) per module.

Because of the modular design, users can activate additional ports at any time with more FXS module daughter cards.

The FXS module passes all the call features of any standard analog telephone.

What are FXS and FXO?

FXS (Foreign Exchange Station)

FXS is an interface which drives a telephone. FXS interfaces get phones plugged into them, deliver battery, and provide ringing. The FXS interface initiates and sends a ringing voltage to the FXO interface.

FXO (Foreign Exchange Office)

FXO is an interface that connect to a phone line. They supply your PBX with access to the public telephone network. FXS interfaces are what allow you to hook telephones to your PBX, and FXO interfaces allow you to connect your PBX to real analog phone lines.

FXO interfaces receives the ringing voltage from the FXS interface.

The phone receiving the call is the last FXO device in the chain, and when it receives voltage from an FXS device, the phone will ring.


To receive voltage from outside lines, connect the outside line to an FXO port on your Asterisk server. Then connect the phones

to FXS ports on your Asterisk server. When the FXO module in your Asterisk Server receives the voltage, it will then generate voltage

using the FXS module and send it to your analog phone.

4 channels FXO/ FXS module.

Support all BORSCHT functions.

Support A _ law/u _ Law compiled code

Support the incoming telegram to reveal

3.3V in power.

all indexes can be programmed to adjust and establish through SPI

Exchangeable with Digium modules: It is compatible with X100M/S100M of Digium.

Applications: Exchanger, Deployment machine, Analog asterisk card, EPON terminal station, IP PBX etc.

Works with below device:



Size and weight



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