The high-performance AIM-ATM enables voice and data traffic to be carried over ATM networks using AAL2 and AAL5 encapsulation, when installed in Cisco router. It is used in conjunction with a T1/E1 voice/WAN interface card (VWIC-MFT) for circuit-mode data and frame-mode data over ATM infrastructures, supporting up to four T1/E1 WAN interfaces.