The enhanced Cisco ATM Port Adapter is a single-port, single-wide ATM port adapter for the Cisco routers using the FlexWAN module.This Cisco ATM Port Adapter supports advanced ATM hardware features such as per-virtual circuit and per-virtual path traffic shaping, as well as all ATM service classes such as real-time variable bit rate (VBR-rt), constant bit rate (CBR), non-real time variable bit rate (VBR-nrt), available bit rate (ABR), and unspecified bit rate (UBR). The Cisco ATM Port Adapter also supports 8191 ATM virtual circuits.This port adapter is designed for Cisco 7000, 7200, 7400, 7500, and 7600 Series routers and Cisco Catalyst 6500 Series.