Support for both ATM Forum standard LAN Emulation (LANE) and Multiprotocol over ATM (MPOA) enable the Catalyst 6000 Family of switches to connect to ATM backbones, providing scalable, intelligent switching with value-added high availability services. Service Provider and Enterprise customers alike can take advantage of support for RFC 1483 Permanent Virtual Circuits (PVC's) with traffic shaping to extend transparent LAN services across wide area ATM networks. In addition, future support for end-to-end Quality of Service (QoS) will enable enterprise voice solutions and services to seamlessly coexist between Ethernet and ATM backbones. These modules each support a dual-PHY interface (one active, one standby) with built in hardware support for wire-speed forwarding and quality of service (QoS) over a range of media options - both singlemode and multimode fiber.