Cisco 10000-2P2-2DC Software Guide - Page 45

Chapter 1 Broadband Aggregation and Leased-Line Overview Leased-Line Architecture Models Figure 1-12 shows an example of Frame Relay architecture. Figure 1-12 Business customer Frame Relay Architecture T1/E1 Clear Channel interface Frame Relay Cisco 10000 series IP Frame Relay/DLC1 SONET/SDH IP network IP 119485 ATM Aggregation ATM is used in many local exchange carrier (ILEC) and PTT access networks, and many providers use the technology as the foundation for multiservice platforms. ATM can be used to provide transport services for many applications, including backhaul for DSL services and leased-line emulation for Internet and VPN services. Figure 1-13 shows an example of ATM architecture. Figure 1-13 Business Customer ATM Architecture T1/E1 ATM ATM interface Cisco 10000 series IP network 119486 IP IP REC 1483 SONET/SDH When used as an ATM aggregator, the Cisco 10000 series router is usually placed in a central POP and connected to a local ATM switching node through optical interfaces. ATM virtual circuits are terminated on the device, and customer IP traffic destined for the Internet or VPN is routed onto the core network. The Cisco 10000 series router supports ATM classes of service (CoSs), including UBR, UBR+, VBR-nrt, and CBR with extensive IP QoS to ATM CoS interworking. The ATM feature set includes accurate and scalable traffic shaping as well as operations, administration, and maintenance (OAM) facilities. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 1-11