Zycoo Mod 2 FXO

2FXOS (Foreign Exchange Office & Foreign Exchange Station) is an interface that mixes FXS ports (station) and FXO ports (office) to connect analogical phones or lines. It includes 2FXO ports and 2FXS ports, and it can be combined with BRI, PRI or GSM modules.

FXO interfaces are used to connect your PBX to the PSTN. One FXO channel is required for each line you receive from your telco.

FXS interfaces are used on the inside of your IP PBX, they do not connect directly to the PSTN. One FXS channel is required for each telephone that you wish to connect to your Asterisk system.

The FXO Interface provides the following features:
Ring Generation and Ringing Trip
Loop Closure Detection
Loop Disconnect
Loop Reversal
Loop Voltage and Current Monitoring
On-hook and Off-hook Transmission
Hook-flash Detection
DTMF Signaling
Programmable Audio Gain
On-board Power Generation
Constant Loop Current: 20mA

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