Cisco 10000 - Manual (Page 43)

1-11
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
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 Frame Relay Architecture
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 ATM Architecture
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.
Frame Relay
IP
Frame Relay/DLC1
IP network
SONET/SDH
IP
Cisco 10000
series
Clear Channel
interface T1/E1
119485
Business
customer
ATM
IP
REC 1483
IP network
SONET/SDH
IP
Cisco 10000
series
ATM
interface T1/E1
119486
Business
Customer