Digium AEX2421B (8 FXS & 4 FXO Ports)
Bus Type: PCI Express 3.3V
The Digium AEX2421B is a 24 port modular analog PCI-Express x1 3.3V card with 8 station and 4 trunk interfaces.
The AEX2400 is a full-length PCI-Express 1.0-compliant modular gateway card for connecting analog telephone stations and analog POTS lines through a PC. It supports a combination of up to six quad port station or trunk modules for a total of 24 lines.
Note: The Digium 12V power connector is needed for the operation of the FXS (station) modules. The power adapter is not required for the operation of FXO (trunk) modules.