This AP-FXS4O4 H/W card supports the four(4) channel FXS(Foreign Exchange Station) and four(4) channel FXO(Foreign Exchange Office) interface port(8xRJ11) and can be used in rack type midrange VoiceFinder VoIP gateway series of AddPac Technology.
In case external power is shutdown or power supply is failure, the AP-FXS4O4 H/W module provides PSTN backup function (relay FXS port to FXO port) using RELAY parts on H/W card automatically.
