The IBM Quad Digital Trunk Telephony PCI Blind Swap Adapter is a highly integrated, intelligent I/O adapter for use in computer telephony applications. This adapter is four-port, full-length, universal PCI 2.2-compliant adapter. It performs voice processing for up to four T1 or E1 digital trunks, providing connectivity for 96 T1 or 120 E1 voice channels in a single PCI slot.The IBM Quad Digital Trunk Telephony PCI Blind Swap Adapter is made up of two separate cards - a base card that interfaces with the host system and performs telephony processing functions, and a daughter card that provides the physical interface to the switch.