This AP-FXS2O2 H/W card supports the two(2) channel FXS(Foreign Exchange Station) and two(2) channel FXO(Foreign Exchange Office) interface port (4xRJ11) 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-FXS2O2 H/W module provides PSTN backup function (relay FXS port to FXO port) using RELAY parts on H/W card automatically.
