Zycoo Mod 4 FXO

The analog trunk FXO (Foreign Exchange Office) is an interface that connects to a trunk line, like the one from your service provider. It receives ringing voltage and battery from FXS devices. FXO interfaces are used to connect your PBX to the PSTN. One FXO channel is required for each line you receive from your Telco.

The Analog Trunk FXO provides connectivity to analog central office loop start trunk line analog interfaces. And it can be combined with BRI, PRI, GSM module.

The FXO Analog Interface provides the following features:
Detects ringing when on-hook
Detects loop current when off-hook
DC triggering
Can accommodate private branch exchange (PBX) with -48 V battery voltage
Loop current range: 13-110mA
Voltage detection threshold is software-selectable