Cisco Systems 10000 manual Business, Customer, ATM Aggregation

Figure 8

Frame Relay Architecture

		Clear Channel
Business		Interface
	T1/E1	Cisco
Customer
		10000
			IP Network
		Series
	Frame Relay
	IP		IP
	Frame Relay/DLC1
	SONET/SDH

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

		ATM
Business		Interface
	T1/E1	Cisco
Customer
		10000
			IP Network
		Series
	ATM
	IP		IP
	RFC 1483
	SONET/SDH

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.

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