Atm aggregation – Cisco 10000 User Manual

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Figure 8

Frame Relay Architecture

Many service providers offer IP Internet access and VPN products over existing Frame Relay access networks. Frame

Relay packet switched networks allow flexibility to build in contention and to better dimension infrastructure

resources based on traffic profiles, allowing better economies of scale. When aggregating Frame Relay circuits, the

Cisco 10000 Series is usually located in a central POP and connects to local switch nodes through copper or optical

interfaces. Typically, these connections are effected with nonchannelized interfaces. Frame Relay data-link

connection identifiers (DLCIs) are terminated on the Cisco 10000 Series with customer IP traffic routed through the

core network. Frame Relay encapsulation is supported on the full range of packet interfaces, including channelized

and nonchannelized modules. Numerous Frame Relay options and services are supported on the platform, including

traffic shaping and QoS.

ATM Aggregation

ATM is prevalent in many incumbent local exchange carrier (ILEC) and PTT access networks, and many providers

use the technology as the foundation for multiservice platforms. Over the past several years, ATM has been used to

provide transport services for many applications, including backhaul for DSL services and leased-line emulation for

Internet and VPN services.

Figure 9

ATM Architecture

When used as an ATM aggregator, the Cisco 10000 Series 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.

Clear Channel

Interface

Frame Relay

Frame Relay/DLC1

SONET/SDH

Cisco
10000

Series

IP Network

T1/E1

Business

Customer

ATM