DIGIUM, 1A4B00F 4 Port Modular Analog Pci Express X1 Card The Digium 1A4B00F is a 4-portmodular PCI Express cardthat supports a mix of up to 4 FXO or FXS analog ports The Digium 1A4B00F is a 4-portmodular PCI Express cardthat supports a mix of up to 4 FXO or FXS analog ports The Digium 1A4B00F is a 4-portmodular PCI Express cardthat supports a mix of up to 4 FXO or FXS analog ports