The Cisco Enhanced FlexWAN module enables high-performance, intelligent WAN and MAN service scalability for both enterprises and service providers. The Cisco Enhanced FlexWAN module supports a variety of clear-channel and channelized WAN interfaces, including T1/E1, T3/E3, High-Speed Serial Interface (HSSI), T3/E3 ATM, OC-3 ATM, and OC-3 packet over SONET (POS), with the ability to directly interface with high-speed SONET equipment for MANs and WANs. The Cisco Enhanced FlexWAN module accepts up to two WAN port adapters commonly used with the Cisco 7200 and 7500 Series Routers, providing an easy migration path for Cisco customers from the Cisco 7500 Series to the Cisco 7600 Series. In addition, the Cisco Enhanced FlexWAN module adds switch fabric connectivity, offers increased performance and memory compared to the existing FlexWAN module, and supports advanced features targeted at Metropolitan (Metro) Ethernet markets. This innovative architecture is designed to deliver numerous media options and enable scalable, distributed, intelligent network services for the next generation of applications.