Spirent Smartbits AT-9155Cs ATM OC-3/STM-1, 1-port, single mode SmartCard. The ATM series of SmartBits® compatible SmartCards is used to generate and monitor ATM network traffic. Applications include testing ATM-to-LAN internetworking devices, very high performance ATM backbones, xDSL devices, and LAN-to-ATM, edge devices. The capabilities of the ATM SmartCards include frame-level testing at full-duplex, full wire-rate testing of edge devices and switches, switch testing at full-cell rate, and high-rate signaling testing for edge devices.