The FXS module allows the Asterisk card AC400 card to terminate analog telephones.Because of the modular design, a user can activate additional ports at any time with more FXS module daughter cards. The FXS module passes all the call features any standard analog telephone will support.

Note: To use the FXS module, you must provide 12V DC power to the Asterisk card AC400, either from the computer's power supply.